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Article

Hydrogenetic and Diagenetic Controls on the Specific Surface Area of Polymetallic Nodules in Deep Ocean Basins

by
Xiangwen Ren
1,2,*,
Haonan Li
3,
Shijuan Yan
1,2,
Huaiming Li
4 and
Xuefa Shi
1,2
1
Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2
Laboratory for Marine Geology, Laoshan Laboratory, Qingdao 266237, China
3
College of Marine Sciences, Ocean University of China, Qingdao 266100, China
4
Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
*
Author to whom correspondence should be addressed.
Minerals 2023, 13(11), 1431; https://doi.org/10.3390/min13111431
Submission received: 4 August 2023 / Revised: 26 October 2023 / Accepted: 26 October 2023 / Published: 11 November 2023
(This article belongs to the Special Issue The Investigation of Polymetallic Nodule Resources in the Deep Ocean: Review and Perspective)
Browse Figures
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Abstract

:
Polymetallic nodules (nodules) are a predominant deep-sea mineral resource due to theirenrichment with critical metals, such as Co, Ni, and Cu, and rare earth elements (REEs). The loose and porous nature of nodules contributes to their adsorption and enrichment in trace metals from seawater and pore water. Consequently, the specific surface area (SSA) of nodules is a key factor requiring further study. However, controls on the SSA of nodules with various genetic types remain poorly characterized. This study aimed to investigate controls on nodule SSA by analyzing the transition metals, REEs, mineralogy, and SSA of nodules recovered from basins in the Atlantic, Indian, and Pacific oceans, including the Northwest Pacific Basin (NPB), Bauer Basin (BB), Tiki Basin (TB), Wharton Basin (WB), Central Indian Basin (CIB), and Angola Basin (AB). Nodule SSAs were compared among the various basins by calculating the BET SSA (based on the equation proposed by Brunauer, Emmett, and Teller, 1938). The results suggest thatnodules from the PNB, WB, CIB, and AB are mainly hydrogenetic, and those nodules have a relatively high SSA, high Co, low Ni and Cu, positive Ce anomalies, and low X-ray diffraction (XRD) intensities at ~10 Å. The nodules from the BB and TB are mainly diagenetic in origin, characterized by a relatively low SSA, low Co, high Ni and Cu, negative Ce anomalies, and high XRD intensities at ~10 Å. The SSAs of nodules were significantly positively correlated with Co, δCe, and light REEs (LREEs), and negatively correlated with the XRD intensity at ~10 Å, Ni, and Cu. The SSAs of nodules from the NPB ranged from 329.440 m2/g to 418.711 m2/g, comparable to the SSAs of Co-rich crusts on seamounts. This study proposes that nodule SAA is regulated by nodule genesis and that hydrogenetic nodules have a higher SSA.

1. Introduction

Deep sea polymetallic nodules (nodules) are generally 1–10 cm in diameter and discoidal–ellipsoidal–spherical in shape [1]. Nodules are composed predominantly of Mn and Fe oxides and are enriched in critical metals, including Co, Ni, Cu, rare earth elements (REEs), and Mo. These nodules are extensively distributed upon the vast abyssal plains of the global oceans at depths of 3500–6500 m [2,3]. Nodules can be classified according to their genesis as hydrogenetic, diagenetic, or hydrothermal, with nodules in these categories differentiated by their compositions of major elements, REEs, and minerals [4,5,6,7]. The Clarion–Clipperton Zone (CCZ) is estimated to have 34 billion tons of nodules, containing 7500, 265, 340, and 78 million tons of Mn, Cu, Ni, and Co, respectively [8]. The Metals Company has recovered 3021 tons of nodules from the seafloor of the CCZ [9], and the International Seabed Authority is working intensively on mining code concerningtheirapplication forexploitation contracts [10]. These developments suggest the approaching technological and regulatory maturity of commercial mining of nodules for some critical metal resources.
Metal enrichment in nodules occurs through the adsorption or absorption of trace metals in seawater and pore water by Mn and Fe oxides [2,11]. The concentrations of Mn, Fe, Co, and Ni in seawater of the CCZ are 5.0 ng/g, 6.0 ng/g, 0.1 ng/g, and 50 ng/g [12], respectively, whereas in sediment pore water they are 16.43 ng/g, 123.3 ng/g, 4.12 ng/g, 0.34 ng/g, and 1.19 ng/g [13], respectively. The concentrations of Co, Ni, and Cu in nodules in the CCZ exceed those in seawater and pore water, with average concentrations of 0.21%, 1.30%, and 1.07%, respectively [14], with the Co and Ni concentrations exceeding those in seawater by factors of 2.1 × 107 and 2.6 × 105,respectively, and those in pore water by factors of 6.18 × 106 and 1.09 × 107, respectively. Nodule enrichment in trace metals, such as Co, Ni, and Cu, occurs through the adsorption of metals from the seawater and sediment pore water. Therefore, this enrichment is strongly related to the large specific surface area (SSA) of nodules and their long-term exposure to seawater and sediment pore water.
The nodule growth rates in the CCZ and Cook Islands Exclusive Economic Zone (EEZ) are 3–8 mm/Ma and 1.0–4.2 mm/Ma, respectively [15,16]. This suggests that trace metal adsorption by these nodules from seawater and pore water occurs over an extended geological time. Furthermore, the large SSA of nodules is due to their loose and porous texture and contributes to nodule enrichment in Co and Ni [17]. Adsorption experiments have shown that the SSA and hydroxyl site density of Mn oxides correlate positively with the equilibrium concentration of Co2+ [18], which suggests that SSA is a critical factor regulating nodule enrichment in trace metals.
The SSAs of nodules and ferromanganese crusts are generally determined by nitrogen adsorption using the BET equation proposed by Brumauer, Emmett, and Teller [19]. Previous studies have analyzed the SSAs of nodules and crusts under various conditions, including sample size, degassing temperature, and degassing duration [20,21,22,23]. The sample sizes were1–2 mm [22], 75–45 μm [23], or 170 μm [24]. Degassing in these previous studies was conducted at 130–140 °C for 3 h [22], at 25 °C for 16 h [24], or at 110 °C to 900 °C with an increment of 100 °C [23]. Li [25] obtained comparable estimates of SSA by constraining the degassing temperature and degassing duration, limiting the sample size, applying temperature programming, accumulating heat, and applying particle size comparison methods based on BET. Their results suggested that consistent SSA values can be obtained by heating polymetallic nodules with a diameter ranging between 1 and 2 mm in a vacuum system for 3 h at 210 °C.
The present study aimed to investigate how nodule genesis regulates nodule SSA by examining the major elements, REEs, and mineralogy of nodules obtained from the Pacific, Indian, and Atlantic oceans.

2. Samples and Methods

2.1. Samples

The present study analyzed 20 nodules recovered from 18 sites in 6 basins using a box corer during Cruises DY42 in 2017, DY 46 and 48 in 2018, and DY52 in 2019. Nodules were recovered from the Pacific, Indian, and Atlantic oceans, including the Northwest Pacific Basin (NPB), Bauer Basin (BB), Tiki Basin (TB), Wharton Basin (WB), Central Indian Basin (CIB), and Angola Basin (AB) (Table 1, Figure 1). Sampling water depths ranged from 4271 m to 5629 m. The nodules recovered from 8 sites in the NPB were mainly spheroidal in shape with a smooth surface or comprised several joined spheroidal nodules forming a polynucleate nodule. Cauliflower-shaped nodules were recovered from two sites and three sites in the BB and TB, respectively. Spheroidal, polynucleate, and cauliflower-shaped nodules were recovered from one site and three sites in the WB and CIB, respectively. The nodules recovered from one site in the AB were polynucleate or cauliflower-shaped. An aliquot subsample was extracted from the surface of each of the 20 nodules for the analysis of chemistry, mineralogy, and SSA. All analyses were conducted at the Key Laboratory of Marine Geology and Metallogeny of the First Institute of Oceanography, Ministry, and Natural Resources of the People’s Republic of China.

2.2. Methods

A portion of each aliquot was ground to a particle size < 74 μm using an agate mortar and pestle for chemical and mineralogical analysis. The remaining portion of each aliquot was ground to a particle size < 7 mm for the SSA analysis. Sample particles for chemical analysis were dried at 110 °C for 4 h prior to digestion, following which they were placed in a silicagel desiccator to cool to room temperature. A subsample of 0.05 ± 0.0005 g of each dried sample was digested in a Teflon pressure vessel. The dried fine particles were dissolved using ultrapure concentrated acids, first using 1.5 mL HNO3 and 1 mL HF at 190–200 °C for 48 h. After cooling, the samples were evaporated at 140–150 °C to incipient dryness, redissolved in 1 mL HNO3 (1:1), and heated again to incipient dryness to evaporate the HF. The residues were dissolved again in 4 mL HNO3 (1:1), following which 1 mL Rh (1 ppm) was added as an internal standard, and the sample was heated at 150 °C for 12 h in a Teflon pressure vessel. After cooling, 1 to 2 droplets of H2O2 were added to the residues, and the sample was transferred to a plastic cup containing 2% HNO3. The sample was finally diluted with 2% HNO3 to 100 g for analysis.
Analyses of major and minor elements were conducted using inductively coupled plasma optical emission spectrometry(ICP-OES, Thermal iCAP6300 instrument) (Thermal Fisher Scientific Inc., Waltham, MA, USA). The samples were analyzed for Al2O3, CaO, TFe2O3, K2O, MgO, MnO, Na2O, P2O5, TiO2, Co, Cu, Ni, Ba, Sr, and Pb, whereas REEs were determined using inductively coupled plasma mass spectrometry(ICP-MS, Thermal X SeriesII) (Thermal Fisher Scientific Inc., Waltham, MA, USA). Analytical accuracy was assessed by analyzing standards GSMC-1 and GSMC-2 together with the nodule samples. X-ray diffraction (XRD) on the dried sample particles using the Rigaku Corporation D/max2500PC (18 KW) (Rigaku Corp., Akishima-shi, Tokyo, Japan) was conducted for mineralogical analysis. XRD was conducted at a tube power of 18 KW, a scanning range of 3° to 75° (2θ), and a step scan width of 2°/min.
The SSA was determined by extracting a surface sample of 1–2 mm from each of the 20 nodules. These samples were pre-treated for 3 h at 210 °C for degassing, following the procedure described in the literature [25]. The specific surface areas were determined by N2 adsorption by applying the BET equation [26] and using the JW-BK100B instrument (JWGB Sci.&Tech. Inc., Beijing, China). Measurement accuracy was assessed by analyzing the standard SRB-9C (N134) with an SSA of 137.9 m2/g together with the nodule samples.

3. Results

3.1. Nodule Transition Metals and REEs

The nodule concentrations of transition metals and REEs determined in the present study varied among the different basins from which the nodules were collected (Table 1, Figure 2). The Mn concentrations of nodules collected from the NPB ranged from 19.68% to 22.04%, whereas those of nodules collected from the BB and TB were higher, ranging from 29.49% to 31.48% and from 28.18% to 31.62%, respectively. Nodules collected from the CIB had the lowest Mn concentrations, ranging from 14.44% to 22.16%. Nodules collected from the WB and AB showed similar average Mn concentrations to those collected from the NPB at 22.74% and 21.79%, respectively.
The nodules collected from the NPB showed the highest Co concentrations at 0.42% to 0.46%, whereas those collected from the BB and TB showed the lowest concentrations at 0.03% to 0.07% and 0.09% to 0.10%, respectively. Nodules collected from the CIB, WB, and AB showed intermediate Co concentrations of 0.10 to 0.26%, 0.30%, and 0.16%, respectively.
The nodules collected from the NPB showed the lowest Ni concentrations, ranging from 0.36% to 0.61%, whereas those collected from the BB and TB showed the highest concentrations, ranging from 1.28% to 1.61% and from 1.19% to 1.23%, respectively. Nodules collected from the CIB, WB, and AB showed intermediate Ni concentrations at 0.61 to 0.84%, 0.63%, and 0.72%, respectively.
The Cu concentrations of nodules among the different basins showed a pattern similar to that of Ni. The nodules collected from the NPB had the lowest Cu concentrations at 0.19% to 0.31%, whereas those collected from the BB and TB had the highest concentrations at 0.94% to 0.99% and 0.97% to 1.13%, respectively. Nodules collected from the CIB, WB, and AB showed intermediate Cu concentrations of 0.33 to 0.43%, 0.48%, and 0.31%, respectively.
The ΣREE concentrations of nodules collected from the NPB ranged from 1991 μg/g to 2348 μg/g. In comparison, those of nodules collected from the BB and TB were far lower and ranged from 430 μg/g to 588 μg/g and 433 μg/g to 538 μg/g, respectively. Nodules collected from the CIB, WB, and AB showed a higher ΣREE relative to those from the BB and TB at 959 μg/g to 1646 μg/g, 2053 μg/g, and 1376 μg/g, respectively. The distributions of REE (Figure 3) in nodules collected from the NPB, WB, CIB, and AB exhibited positive Ce anomalies and negative Y anomalies, whereas those of nodules collected from the BB and TB showed negative Ce anomalies.

3.2. Mineralogical Composition of Nodules

The present study applied XRD to determine the crystalline phase of nodule mineralogy (Figure 4). XRD patterns of nodules from the six basins showed broad peaks at ~10 Å and ~5 Å corresponding to todorokite, at ~7 Å corresponding to 7 Å phyllomanganate, and at ~2.45 Å and ~1.42 Å corresponding to vernadite. Furthermore, they demonstrated narrow and sharp peaks at ~3.34 Å corresponding to quartz, and at ~3.20 Å corresponding to phillipsite.
The XRD intensities of nodules from the BB and TB at ~10 Å exceeded those of nodules from the NPB, CIB, WB, and AB. The XRD intensities of nodules from the NPB at ~10 Å ranged from 72 cps to 133 cps (mean of 93 cps); those of nodules from the BB and TB ranged from 145 cps to 175 cps (mean of 160 cps) and from 156 cps to 182 cps (mean of 171 cps), respectively; while those of nodules from the CIB, WB, and AB were 93 to 136 cps, 86 cps, and 120 cps, respectively.

3.3. Nodule-Specific Surface Areas

The SSAs of nodules collected from the PNB (329.440 m2/g to 418.711 m2/g; mean of 359.250 m2/g) significantly exceeded those of nodules from the TB (135.417 m2/g to 174.141 m2/g; mean of 153.925 m2/g) and BB (86.928 m2/g to 181.343 m2/g; mean of 150.229 m2/g). Nodules collected from the AB, CIB, and WB also showed relatively high SSAs (Figure 5) at 281.767 m2/g, 182.140 m2/g to 366.570 m2/g (mean of 264.857 m2/g), and 387.827 m2/g, respectively.

4. Discussion

4.1. Genesis Discrimination

Three principle processes are mainly responsible for the formation of ferromanganese oxides in the oceans [2]: (1) hydrogenetic precipitation, (2) diagenetic precipitation, and (3) fallout of hydrothermal fluids. Although examinations of the nodule texture, chemistry, and mineralogy have indicated that nodule genesis varies during the growth of nodules [28,29,30], the dominant processes responsible for nodule formation differ among the different oceans. For example, hydrogenetic precipitation is the dominant process responsible for the formation of nodules in the EEZ of the Cook Islands in the West Pacific [16], whereas diagenetic precipitation dominates in the PB [2], and both processes contribute in the CCZ and CIB.
Nodule genesis can be determined by examining the nodule contents of transition metals, trace elements, and REEs, as shown in Figure 6 and Figure 7 [6,7]. As shown in Figure 6, the Nd concentrations and Ce anomalies of nodules from the NPB and WB indicated genesis dominated by hydrogenetic processes. In comparison to nodules collected from the NPB and WB, those collected from the CIB and AB had compositions that indicated the dominance of diagenetic–hydrogenetic processes. The Nd concentrations and Ce anomalies of nodules collected from the BB and TB indicated the dominance of diagenetic processes. As shown in Figure 7, the compositions of nodules collected from the NPB indicated the dominance of hydrogenetic processes, whereas those from the BB and TB indicated diagenetic processes. Nodules collected from the WB and two sites in the CIB had compositions that indicated hydrogenetic processes, whereas those of nodules collected from the AB and the remaining CIB sites indicated hydrogenetic and diagenetic processes, effectively representing nodules of mixed origin. The discrimination of nodule genesis shown in Figure 6 is consistent with that shown in Figure 7, with the latter figure better discriminating between nodules produced by mixed hydrogenetic–diagenetic processes.
The nodules formed by diagenetic processes in the CCZ and PB consisted mainly of disordered phyllomanganates, and these nodules showed prominent XRD peaks at ~10 Å relative to those of the crust produced by hydrogenetic processes [31]. The nodule genesis discrimination provided by Figure 6 and Figure 7 is consistent with the mineralogy of those nodules. Nodules from the PNB, WB, CIB, and AB showed low XRD intensities at ~10 Å ranging from 72 cps to 136 cps and showed short peaks differing from the background XRD patterns. In comparison, the nodules collected from the BB and TB showed relatively high XRD intensities at ~10 Å ranging from 145 cps to 182 cps andprominent peaks in the XRD patterns. Furthermore, the results of the discrimination of nodule genesis were consistent with the nodule SSA, with nodules in the NPB produced by hydrogenetic processes having a high SSA and nodules in the BB and TB produced by diagenetic processes having a relatively low SSA.

4.2. Correlation Analysis among Transition Metals, Mineralogy, and SSA

The present study investigated the controls on nodule SSA by calculating Pearson correlation coefficients among the concentrations of the transition metals Co, Ni, and Cu, Ce anomalies, and XRD intensities at ~10 Å, and SSA. With an n = 20, correlation coefficients >0.561 or <−0.561 were taken to represent a significant correlation at p = 0.01. As shown in Table 2, nodule SSA showed correlations with the concentrations of Co, Ni, and Cu, Ce anomaly, and XRD intensities at ~10 Å (p < 0.01). SSA was correlated positively with Co concentrations and Ce anomalies with correlation coefficients of 0.895 and 0.706, respectively, whereas it was negatively correlated with Cu and Ni concentrations and XRD intensity at ~10 Å with correlation coefficients of −0.842, −0.879, and −0.875, respectively. Furthermore, XRD intensity at ~10 Å showed positive correlations with Cu and Ni with correlation coefficients of 0.894 and 0.942, respectively. XRD intensity at ~10 Å was negatively correlated with Co, Ce anomaly, and SSA, with correlation coefficients of −0.859, −0.668, and −0.875, respectively.
The nodule compositions of transition metals, REEs, and minerals suggested that the main processes regulating their geneses included hydrogenesis and diagenesis. Nodules created through hydrogenetic processes showed relatively high Co and Nd concentrations, low Ni and Cu concentrations, positive Ce anomalies, and low XRD intensities at ~10 Å, whereas the opposite compositional patterns were observed for nodules created through diagenesis processes. Nodules produced through mainly hydrogenetic processes, such as those of the NPB, WB, CIB, and AB, showed a relatively high SSA, whereas nodules produced by mainly diagenetic processes, such as those from the BB and TB, showed a relatively low SSA. This pattern of SSA was consistent with the correlation coefficients among the nodule compositions. Therefore, the present study proposes that the SSAs of polymetallic nodules of the global ocean basins are regulated by hydrogenetic and/or diagenetic processes.

5. Summary

Nodules that were produced by mainly hydrogenetic processes showed a relatively high SSA, high Co concentrations, low Ni and Cu concentrations, positive Ce anomalies, and low XRD intensities at ~10 Å, whereas the opposite pattern was observed for nodules produced by mainly diagenetic processes. The SSAs of polymetallic nodules in the global ocean basins, including the Northwest Pacific Basin, Bauer Basin, Tiki Basin, Wharton Basin, Central Indian Basin, and Angola Basin, were significantly correlated with the concentrations of transition metals Co, Ni, and Cu, Ce anomalies, and XRD intensities at ~10 Å. This pattern suggests that nodule SSAs are regulated by hydrogenetic and/or diagenetic processes.

Author Contributions

X.R.: Funding acquisition, conceptualization ideas, Writing–original draft, writing review, and editing. H.L. (Huaiming Li): Methodology and analyzing samples. S.Y.: Data curation and visualization. H.L. (Haonan Li): Investigation. X.S.: Supervision. All authors have read and agreed to the published version of the manuscript.

Funding

This work was financially supported by the Marine S&T Fund of Shandong Province for Laoshan Laboratory under Grant No. 2021QNLM020003-2, and by the China Ocean Mineral Resources R&D Association (COMRA) project under Grant No. DY135-N2-1-04.

Data Availability Statement

Not applicable.

Acknowledgments

We thank the captains and crews of the R/V Dayangyihao and Xiangyanghong01, and the science party members of the Chinese Dayang Cruise DY 42, DY 46, DY 48, and DY 52. The nodule samples in this study were provided by the China Ocean Sample Repository.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Locations of sites from which nodules were collected by a box corer. (www.gebco.net (accessed on 14 January 2020)).
Figure 1. Locations of sites from which nodules were collected by a box corer. (www.gebco.net (accessed on 14 January 2020)).
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Figure 2. Average concentrations of transition metals of nodules in this study. (Grey, blue, green and orange bars are the average concentrations of Mn, Ni, Co, and Cu of nodules from NPB, BB, TB, WB, CIB, and AB, respectively).
Figure 2. Average concentrations of transition metals of nodules in this study. (Grey, blue, green and orange bars are the average concentrations of Mn, Ni, Co, and Cu of nodules from NPB, BB, TB, WB, CIB, and AB, respectively).
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Figure 3. Distribution patterns of rare earth elements (REEs) of nodules. (PAAS, REE concentrations of post-Archean shales from Australia from [27]).
Figure 3. Distribution patterns of rare earth elements (REEs) of nodules. (PAAS, REE concentrations of post-Archean shales from Australia from [27]).
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Figure 4. X-ray diffraction patterns of nodules examined in this study.
Figure 4. X-ray diffraction patterns of nodules examined in this study.
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Figure 5. Geographical distribution of specific surface areas (SSAs) of nodules examined in this study.
Figure 5. Geographical distribution of specific surface areas (SSAs) of nodules examined in this study.
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Figure 6. Discrimination of nodule genesis according to nodule compositions of rare earth elements (REEs) [6]. (The plots shown in this diagram by the upper-left legend represent nodules examined in the present study, whereasthe plots of nodules and crusts of various geneses are data from a previous study [6]).
Figure 6. Discrimination of nodule genesis according to nodule compositions of rare earth elements (REEs) [6]. (The plots shown in this diagram by the upper-left legend represent nodules examined in the present study, whereasthe plots of nodules and crusts of various geneses are data from a previous study [6]).
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Figure 7. Ternary discriminative diagram for genetic classification of oceanic ferromanganese deposits [7].
Figure 7. Ternary discriminative diagram for genetic classification of oceanic ferromanganese deposits [7].
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Table 1. Nodule compositions of transition metals and rare earth elements (REEs), X-ray diffraction (XRD) intensities at 10 Å, and the SSAs.
Table 1. Nodule compositions of transition metals and rare earth elements (REEs), X-ray diffraction (XRD) intensities at 10 Å, and the SSAs.
Sample No. MnCoCuNiLaCePrNdSmEuGdTbDyHoErTmYbLuYδCeLREEHREEXRD10Å Peak IntensitySSA
%%%%μg/gμg/gμg/gμg/gμg/gμg/gμg/gμg/gμg/gμg/gμg/gμg/gμg/gμg/gμg/g μg/gμg/gcpsm2/g
DY48-II-BC1821a L [S]NPB20.98 0.46 0.20 0.45 187 1431 44.0 170 36.5 8.61 39.5 5.85 36.8 7.26 20.6 2.86 20.8 3.13 147 3.64 1877 284 94370.086
DY48-II-BC1822 M [F]20.53 0.42 0.23 0.36 178 1478 42.9 165 35.8 8.32 37.3 5.66 35.5 6.79 19.4 2.74 19.9 3.01 122 3.90 1908 252 78329.440
DY48-II-BC1823 M [F]20.46 0.42 0.23 0.46 197 1429 46.5 179 38.8 9.24 41.2 6.22 39.3 7.57 21.4 3.00 21.6 3.25 147 3.44 1900 291 85342.685
DY48-II-BC1824 M [S]19.68 0.44 0.19 0.39 196 1496 46.6 178 38.6 9.16 41.2 6.22 38.9 7.64 21.6 2.98 21.9 3.23 141 3.61 1965 285 102418.711
DY48-II-BC1825 M [F]19.81 0.42 0.25 0.48 221 1517 52.3 203 43.8 10.30 45.0 6.75 41.0 7.87 22.2 3.03 21.7 3.27 150 3.25 2047 301 126367.632
DY48-II-BC1826 L [T]19.92 0.42 0.30 0.52 200 1221 47.0 183 39.5 9.37 42.0 6.40 40.6 7.93 22.4 3.12 22.7 3.42 148 2.91 1700 297 124355.589
DY48-II-BC1827 S [S]20.21 0.44 0.26 0.47 206 1320 48.1 185 39.5 9.35 42.5 6.51 41.1 8.01 22.9 3.16 22.9 3.44 142 3.06 1808 293 91342.591
DY48-II-BC1828 [F]22.04 0.45 0.31 0.61 192 1250 46.5 179 38.6 9.20 40.9 6.26 39.4 7.60 21.5 2.98 21.5 3.25 132 3.05 1716 275 162347.263
46IV-ESPB-S014BC01 M [C]BB29.49 0.05 0.97 1.55 100 84 19.6 83 18.5 4.98 22.8 3.56 25.5 5.58 16.7 2.28 16.7 2.58 164 0.44 310 260 240167.087
46IV-ESPB-S014BC01-2 L [C]30.74 0.05 0.94 1.61 105 80 20.5 88 19.5 5.17 23.9 3.76 26.5 5.81 17.4 2.35 17.0 2.67 170 0.40 318 270 219165.558
46IV-ESPB-S014BC01-3 S [C]30.59 0.07 0.99 1.60 101 78 20.6 88 19.1 5.09 24.7 3.77 26.2 5.76 17.1 2.44 17.1 2.62 162 0.39 311 261 236181.343
46IV-ESPB-S015BC02 M [C]31.48 0.03 0.96 1.28 78 64 15.5 66 14.7 4.09 18.2 2.87 20.4 4.36 13.0 1.78 13.1 2.05 114 0.42 241 189 28186.928
46V-ESPB-S002BC02 MTB28.18 0.09 0.97 1.21 97 98 20.0 83 17.8 4.72 21.0 3.25 22.7 4.84 14.5 1.96 14.1 2.14 133 0.51 321 217 250152.216
46V-ESPB-S003BC03-1 M [C]28.97 0.10 1.13 1.23 79 91 16.3 66 14.6 3.81 16.8 2.60 17.9 3.82 11.2 1.54 11.0 1.67 105 0.59 272 172 257135.417
46V-ESPB-S004GC04 M [T]31.62 0.10 1.04 1.19 78 101 17.4 71 15.9 4.03 17.3 2.68 17.7 3.56 10.1 1.38 10.1 1.51 82 0.63 287 146 281174.141
52I-IR-S017TW03WB22.74 0.30 0.48 0.63 175 1437 41.7 146 34.7 8.14 36.0 5.45 31.1 5.90 17.1 2.57 18.6 2.66 91 3.88 1842 211 120387.827
52I-IR-S027BC03CIB22.16 0.26 0.43 0.84 232 1482 55.7 212 46.6 10.90 47.3 7.15 39.5 7.34 20.6 3.01 21.7 3.15 110 3.01 2039 260 155245.861
52I-IR-S027BC0617.64 0.21 0.33 0.71 174 1076 43.0 150 35.5 8.38 36.2 5.43 29.6 5.46 15.4 2.22 16.0 2.23 81 2.87 1487 194 145366.570
42I-IB-S023BC03 S14.44 0.10 0.39 0.61 122 396 38.1 147 35.2 8.20 34.4 5.06 30.1 5.45 14.6 1.85 12.9 1.80 106 1.32 747 212 138182.140
46II-(SAKB)-S62-BC01 M [P]AB21.79 0.16 0.31 0.72 151 701 48.1 182 43.3 9.77 40.2 6.20 36.4 6.61 17.9 2.43 17.0 2.46 111 1.87 1135 241 167281.767
Table 2. Correlation coefficient matrix of transition metals, Ce anomalies, X-ray diffraction (XRD) intensity at ~10 Å, and specific surface area (SSA).
Table 2. Correlation coefficient matrix of transition metals, Ce anomalies, X-ray diffraction (XRD) intensity at ~10 Å, and specific surface area (SSA).
CoNiCuδCeXRD Intensity at ~10 ÅSSA
CoPearson Correlation1
Sig. (2-tailed)
N20
NiPearson Correlation−0.852 **1
Sig. (2-tailed)0.000
N2020
CuPearson Correlation−0.871 **0.935 **1
Sig. (2-tailed)0.0000.000
N202020
δCePearson Correlation0.841 **−0.664 **−0.761 **1
Sig. (2-tailed)0.0000.0010.000
N20202020
XRD intensity at ~10 ÅPearson Correlation−0.859 **0.942 **0.894 **−0.668 **1
Sig. (2-tailed)0.000 0.0000.0000.001
N2020202020
SSAPearson Correlation0.895 **−0.879 **−0.842 **0.706 **−0.875 **1
Sig. (2-tailed)0.0000.0000.0000.0000.000
N202020202020
**: Correlation is significant at the 0.01 level (2-tailed).
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Ren, X.; Li, H.; Yan, S.; Li, H.; Shi, X. Hydrogenetic and Diagenetic Controls on the Specific Surface Area of Polymetallic Nodules in Deep Ocean Basins. Minerals 2023, 13, 1431. https://doi.org/10.3390/min13111431

AMA Style

Ren X, Li H, Yan S, Li H, Shi X. Hydrogenetic and Diagenetic Controls on the Specific Surface Area of Polymetallic Nodules in Deep Ocean Basins. Minerals. 2023; 13(11):1431. https://doi.org/10.3390/min13111431

Chicago/Turabian Style

Ren, Xiangwen, Haonan Li, Shijuan Yan, Huaiming Li, and Xuefa Shi. 2023. "Hydrogenetic and Diagenetic Controls on the Specific Surface Area of Polymetallic Nodules in Deep Ocean Basins" Minerals 13, no. 11: 1431. https://doi.org/10.3390/min13111431

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