Seeking the Sources of Dust: Geochemical and Magnetic Studies on “Cryodust” in Glacial Cores from Southern Spitsbergen (Svalbard, Norway)
Abstract
:1. Introduction
2. Field and Laboratory Work
2.1. The Origins of Cryodust
2.2. Sampling in the Field
2.3. Cryodust Extraction
2.4. Geochemical Experiments
2.4.1. Sample Preparation
2.4.2. Monazite Dating by Electron Microprobe
2.5. Magnetic Experiments
2.5.1. Magnetic Susceptibility Experiments
2.5.2. Magnetic Hysteresis Experiments
3. Results
3.1. Geochemical Results
3.1.1. SEM–EDS Results
3.1.2. EMP Dating Results
3.2. Magnetic Results
3.2.1. Mass and Magnetic Susceptibility of Dust
3.2.2. Magnetic Susceptibility upon Heating/Cooling
3.2.3. Magnetic Hysteresis Results
4. Discussion
4.1. Geochemical Results
4.2. Magnetic Results
4.2.1. Susceptibility Results
4.2.2. Hysteresis Parameters
4.3. Dust Source Areas
4.3.1. Sedimentological Indicators
4.3.2. Geochemical Indicators
4.3.3. Magnetic Indicators
5. Conclusions
- The mineral fraction of aerosols (here defined as cryodust, < 6.10−5 m in size) deposited in glaciers of the Southern Spitsbergen includes an assemblage of common rock-forming phases accompanied by heavy minerals, such as monazite and zircon.
- Despite a low concentration in ice cores, sources of cryodust can be determined by a combination of geochemical, geochronological and/or magnetic methods.
- Chemical dating by electron microprobe analysis was effective for monazite grains as small as 20 µm, and yielded syn-Caledonian ages (429–423 Ma), pointing to nearby Nordaustlandet (NE Svalbard) as a possible source area, where a Caledonian orogenic belt is exposed to weathering.
- Magnetic analyses of the cryodust demonstrated the predominance of magnetite and an apparent lack the of FeIII-bearing minerals that are more characteristic of low-latitude weathering zones, indicating a lack of cross-latitudinal, far-distance transport of aerosols.
- Magnetite in association with pyrite and prevailing easterly winds suggest near-distance transport from the exposed Triassic rocks of the western part of Edgeøya.
- The presence of intact and non-oxidized framboids of pyrite may point to an origin in local cryoconite holes.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Appendix A
Details of Geochemical Procedures and Methods
Label | Th | U | Pb | Y | Age (Ma) | Error (Ma, 2σ) | Th* | |
---|---|---|---|---|---|---|---|---|
Storbreen | SIC4_mnz1 | 3.26 | 0.122 | 0.078 | 0.3908 | 436 | 38 | 3.5 |
SIC4_mnz2 | 0.601 | 0.045 | 0.019 | 0.3345 | 425 | 175 | 0.71 | |
SIC4_mnz3 | 3.75 | 0.082 | 0.082 | 0.1929 | 423 | 34 | 3.8 | |
SIC4_mnz4 | 4.71 | 0.346 | 0.378 | 1.358 | 1365 | 34.5 | 5.6 | |
Recherchebreen | RIC3_mnz1-1 | 4.56 | 0.190 | 0.108 | 0.6591 | 423 | 27 | 4.9 |
RIC3_mnz2-1 | 3.09 | 0.178 | 0.056 | 1.176 | 256 | 36 | 3.5 | |
RIC3_mnz3-1 | 4.24 | 0.264 | 0.427 | 0.6639 | 1780 | 42 | 4.9 | |
RIC3_mnz3-2 | 4.15 | 0.208 | 0.373 | 0.7671 | 1644 | 42 | 4.6 | |
RIC3_mnz4-1 | 1.22 | 0.057 | 0.034 | 0.3451 | 468 | 91 | 1.3 | |
RIC3_mnz1-2 | 4.25 | 0.177 | 0.105 | 0.5828 | 445 | 29 | 4.6 | |
RIC3_mnz5 | 3.41 | 0.104 | 0.082 | 0.5562 | 439 | 37 | 3.5 | |
RIC3_mnz6 | 1.71 | 0.049 | 0.043 | 0.3691 | 445 | 72 | 1.8 |
Appendix B
Appendix B.1. Details of Magnetic Procedures and Methods
Appendix B.2. Additional Figures and Tables
Appendix B.2.1. Magnetic Susceptibility Data
Location | Sample Name | Mass (10−6 kg) of Filter | Mass of Residue (10−6kg) | κ - Bulk Susceptibility of Filter with Residue (SI vol.) | κ - Bulk Susceptibility of Residue (SI vol.) | χ Susceptibility per Mass m3/kg |
---|---|---|---|---|---|---|
Flatbreen | FIC2 | 106.7 | 28.6 | 1.420 × 10−6 | 1.450 × 10−6 | 5.065 × 10−7 |
FIC3 | 115.06 | 36.6 | 9.130 × 10−7 | 9.460 × 10−7 | 2.584 × 10−7 | |
Hansbreen | H6/1 | 100.2 | 21.9 | 1.333 × 10−6 | 1.369 × 10−6 | 6.262 × 10−7 |
H6/2 | 90.6 | 12.3 | 1.018 × 10−6 | 1.104 × 10−6 | 9.005 × 10−7 | |
H6/3 | 87.5 | 9.1 | 9.421 × 10−8 | 1.296 × 10−7 | 1.418 × 10−7 | |
H6/4 | 89.4 | 11.1 | 8.742 × 10−7 | 9.095 × 10−7 | 8.211 × 10−7 | |
Recherche-breen | RIC2 | 121.5 | 43.1 | 2.720 × 10−7 | 3.050 × 10−7 | 7.073 × 10−8 |
RIC3 | 88.5 | 10.1 | 7.850 × 10−7 | 7.902 × 10−7 | 7.811 × 10−7 | |
Storbreen | SIC2-SIC4 | 120.7 | 42.3 | 7.098 × 10−6 | 7.346 × 10−6 | 1.736 × 10−6 |
Werenskiold-breen | W3 | 110.9 | 32.5 | 6.270 × 10−6 | 6.300 × 10−6 | 1.937 × 10−6 |
W4 | 89.9 | 11.5 | 1.510 × 10−6 | 1.540 × 10−6 | 1.339 × 10−6 | |
W1 | 87.2 | 8.8 | 7.030 × 10−7 | 7.889 × 10−7 | 8.934 × 10−7 | |
W2 | 96.1 | 17.7 | 1.650 × 10−6 | 1.680 × 10−6 | 9.469 × 10−7 | |
W5 | 107.2 | 28.9 | 3.590 × 10−6 | 3.620 × 10−6 | 1.255 × 10−6 | |
W7 | 92.6 | 14.3 | 1.113 × 10−6 | 1.199 × 10−6 | 8.387 × 10−7 | |
empty filter | 78.4 | −8.588 × 10−8 | −1.096 × 10−8 |
Appendix B.2.2. Magnetic Hysteresis Data
Sample | Hc (kA/m) | Mr (nAm2) | Ms (nAm2) | Hcr (kA/m) | Mr/Ms | Hcr/Hc | Initial Slope (10−15 m3) | Initial Ferro (10−15m3) | Initial Para/dia (10−15m3) | Para/dia | Initial Ferro Normalized | Initial Para/dia Normalized |
---|---|---|---|---|---|---|---|---|---|---|---|---|
empty filter | 8.00 | 0.20 | 1.35 | 30.37 | 0.15 | 3.80 | 12.5 | 13.5 | −1.0 | dia | 1.08 | −0.08 |
FIC2 | 8.00 | 1.48 | 14.90 | 25.89 | 0.10 | 3.24 | 157.0 | 150.6 | 6.4 | para | 0.96 | 0.04 |
FIC3 | 8.40 | 1.97 | 15.50 | 27.27 | 0.13 | 3.25 | 186.4 | 175.5 | 10.9 | para | 0.94 | 0.06 |
H6/1 | 10.64 | 0.15 | 0.85 | 32.43 | 0.17 | 3.05 | 20.3 | 8.3 | 12.0 | para | 0.41 | 0.59 |
H6/2 | 7.36 | 0.10 | 0.77 | 28.92 | 0.13 | 3.93 | 27.9 | 7.0 | 20.8 | para | 0.25 | 0.75 |
H6/3 | n/a | 0.08 | −0.21 | 38.53 | -- | -- | 14.9 | −1.8 | 16.7 | para | −0.12 | 1.12 |
H6/4 | 5.04 | 0.12 | 1.51 | 25.63 | 0.08 | 5.09 | 22.9 | 13.7 | 9.2 | para | 0.60 | 0.40 |
RIC2 | 10.40 | 0.40 | 2.60 | 30.02 | 0.16 | 2.89 | 19.9 | 28.6 | −8.6 | dia | 1.43 | −0.43 |
RIC3 | 6.88 | 0.79 | 5.63 | 29.09 | 0.14 | 4.23 | 61.2 | 63.4 | −2.2 | dia | 1.04 | −0.04 |
SIC2-SIC4 | 13.84 | 42.27 | 198.00 | 37.79 | 0.22 | 2.73 | 2423.0 | 2205.0 | 218.0 | para | 0.91 | 0.09 |
W4 | 4.40 | 0.35 | 5.79 | 18.05 | 0.06 | 4.10 | 54.9 | 62.4 | −7.4 | dia | 1.14 | −0.14 |
W1 | n/a | 0.06 | −0.17 | 46.51 | -- | -- | −3.1 | −0.7 | −2.4 | dia | −0.23 | −0.77 |
W2 | 2.64 | 9.76 | 135.00 | 16.34 | 0.07 | 6.19 | 1.7 | 1.9 | −0.2 | dia | 1.12 | −0.12 |
W3 | 5.04 | 5.73 | 77.00 | 18.75 | 0.07 | 3.72 | 855.1 | 820.2 | 34.9 | para | 0.96 | 0.04 |
W5 | 7.68 | 1.50 | 15.50 | 24.79 | 0.10 | 3.23 | 191.7 | 156.1 | 35.6 | para | 0.81 | 0.19 |
W7 | 7.12 | 0.89 | 8.60 | 25 | 0.10 | 3.51 | 74.8 | 98.0 | −23.3 | dia | 1.31 | −0.31 |
SIC2-SIC4 (ht) | 7.44 | 40.20 | 175,00 | 13.96 | 0.23 | 1.88 | 3383.0 | 3438.0 | −55.0 | dia | 1.02 | −0.02 |
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Glacier | Area (km2) | Slope (°) | Mean Elevation (m a.s.l.) | ELA (m a.s.l.) |
---|---|---|---|---|
Recherchebreen | 120.2 | 3.6 | 430 | 555 |
Hornbreen (Flatbreen) | 176.2 | 1.3 | 289 | 398 |
Storbreen | 196.5 | 1.3 | 287 | 383 |
Werenskioldbreen | 27.1 | 3.7 | 358 | 475 |
Hansbreen | 53.8 | 1.7 | 291 | 342 |
Glacier | Name | X | Y | Fe Class | ||
---|---|---|---|---|---|---|
dia | para | ferro | ||||
Recherchebreen | RIC2 | 8,590,996 | 497,999 | L | H | |
RIC3 | 8,588,426 | 505,117 | L | H | ||
Hornbreen (Flatbreen) | FIC2 | 8,567,866 | 545,461 | L | H | |
FIC3 | 8,568,521 | 545,461 | L | H | ||
Storbreen | SIC2 | 8,571,862 | 522,493 | L | H | |
SIC4 | 8,569,458 | 527,542 | L | H | ||
Werenskioldbreen | W1 | 8,556,674 | 512,219 | too weak | ||
W2 | 8,554,873 | 510,970 | L | H | ||
W3 | 8,558,594 | 510,424 | L | H | ||
W4 | 8,557,076 | 510,049 | L | H | ||
W5 | 8,554,458 | 509,747 | L | H | ||
W7 | 8,555,045 | 507,838 | L | H | ||
Hansbreen | H6 (H6/1, H6/2, H6/3, H6/4) | 855,6118 | 515,814 | L | L |
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Lewandowski, M.; Kusiak, M.A.; Werner, T.; Nawrot, A.; Barzycka, B.; Laska, M.; Luks, B. Seeking the Sources of Dust: Geochemical and Magnetic Studies on “Cryodust” in Glacial Cores from Southern Spitsbergen (Svalbard, Norway). Atmosphere 2020, 11, 1325. https://doi.org/10.3390/atmos11121325
Lewandowski M, Kusiak MA, Werner T, Nawrot A, Barzycka B, Laska M, Luks B. Seeking the Sources of Dust: Geochemical and Magnetic Studies on “Cryodust” in Glacial Cores from Southern Spitsbergen (Svalbard, Norway). Atmosphere. 2020; 11(12):1325. https://doi.org/10.3390/atmos11121325
Chicago/Turabian StyleLewandowski, Marek, Monika A. Kusiak, Tomasz Werner, Adam Nawrot, Barbara Barzycka, Michał Laska, and Bartłomiej Luks. 2020. "Seeking the Sources of Dust: Geochemical and Magnetic Studies on “Cryodust” in Glacial Cores from Southern Spitsbergen (Svalbard, Norway)" Atmosphere 11, no. 12: 1325. https://doi.org/10.3390/atmos11121325