Geochemistry and Geochronology of High-Grade Metamorphic Rocks

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Geochemistry and Geochronology".

Deadline for manuscript submissions: 28 June 2024 | Viewed by 584

Special Issue Editors

School of Earth Sciences, China University of Petroleum, Beijing 102249, China
Interests: petrology; Precambrian geology; geochronology; geochemistry; tectonics
Special Issues, Collections and Topics in MDPI journals

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College of Earth Sciences, Hebei GEO University, Shijiazhuang 050031, China
Interests: metamorphism; Precambrian geology; geochronology; mineralogy; tectonics

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Guest Editor
College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
Interests: ultra-high temperature granulite; high-pressure granulite; Pseudosection; mineralogy; tectonics

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Guest Editor
Department of Earth and Environmental Sciences, Kagoshima University, Kagoshima 890-0065, Japan
Interests: metamorphism; igneous rocks petrology; geochemistry; geochronology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

It is a common perception that high-grade metamorphism typifies rocks of early Precambrian ages. While many large granulite complexes are indeed Archean, there also exist many well-preserved upper amphibolite–granulite facies metamorphic rocks in the Phanerozoic orogens all around the world, e.g., the Central Asian orogenic belt, the Alpine-Himalayan orogenic belt, etc., implying a range in the spatio-temporal distribution of the high-grade metamorphism. At higher temperatures, rocks tend to melt, and dealing with silicate melts is the subject of igneous petrology. However, partial melting has always been both a metamorphic and an igneous aspect. Crustal rocks that are characteristically produced via partial melting, so-called migmatites, are made up of a residual metamorphic rock and an igneous rock component, which serves as a key for linking metamorphism and magmatism. Nevertheless, the melting temperatures of rocks define the high-temperature limit of metamorphism. Melting temperatures are strongly dependent on pressure, rock composition, and the amount of water present. Geochemistry (e.g., major minerals, trace elements, and multisotope studies) and geochronology (e.g., U–Pb dating of zircon, monazite, rutile, or titanite) of the high-grade metamorphic rocks in the middle and lower crust can reconstruct the scenery of structure and composition of the lower crust and crust–mantle interaction, let alone the benefits from deciphering high-temperature processes, including migmatite and granulite formation, crustal anatexis, melt extraction, and transfer. Hence, we are planning to publish a Special Issue, titled Geochemistry and Geochronology of High-Grade Metamorphic Rocks, which aims to present contributions related to high-grade metamorphic rocks, including but not limited to high-temperature processes of migmatites.

Dr. Zhuang Li
Dr. Zhanzhan Duan
Dr. Ting Liu
Dr. Hafiz U. Rehman
Guest Editors

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Keywords

  • high-grade metamorphism
  • geochemistry
  • geochronology
  • granulite
  • migmatite
  • partial melting

Published Papers (1 paper)

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Research

20 pages, 5892 KiB  
Article
Geochemistry and Geochronology of the Huangcha Pluton and Tectonic Significance
by Shuping Cao, Lun Li, Chonghui Yang and Yongqiang Yang
Minerals 2024, 14(5), 520; https://doi.org/10.3390/min14050520 - 17 May 2024
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Abstract
The Zanhuang Complex is situated on the eastern margin of the Trans-North China Orogen, with the Huangcha Pluton being a constituent of this complex. To ascertain the nature of the approximately 2.5-billion-year-old Huangcha Pluton, crucial evidence for understanding its extensional setting was sought [...] Read more.
The Zanhuang Complex is situated on the eastern margin of the Trans-North China Orogen, with the Huangcha Pluton being a constituent of this complex. To ascertain the nature of the approximately 2.5-billion-year-old Huangcha Pluton, crucial evidence for understanding its extensional setting was sought through petrogenesis and dating investigations. LA-ICP-MS dating of zircon from the granite yielded an age of (2488 ± 6) Ma. Primarily composed of porphyritic monzonite with sporadic melanocratic enclaves, the Pluton’s phenocrysts are predominantly feldspar with minor quartz. The granite exhibits high SiO2 content (72.64%–74.16%) and alkali levels, with Na2O + K2O ranging from 7.59% to 9.07%, classifying it as a shoshonitic series with a slightly peraluminous feature. Enrichment in large-ion lithophile (LIL) elements (Rb, Th, and U) and depletion in Sr, V, Cr, Co, and Ni were observed, with high Rb/Sr and Ga/Al ratios ranging from 0.73 to 2.72 and 2.75 × 10−4 to 3.11 × 10−4, respectively. The rock exhibits high εNd(t) values, ranging from −0.06 to 0.88, with TDM2 ages falling between 2.79 and 2.87 billion years. Zircon grains display 176Hf/177Hf ratios ranging from 0.281266 to 0.281412 and εHf(t) values spanning from 0.96 to 6.18, calculated using the 207Pb/206Pb age. It is suggested that the Huangcha Pluton represents A-type granite formed via anatexis of the Neoarchean TTG in an extensional setting following orogenic processes. The formation of the Huangcha Pluton further corroborates the stabilization of the North China Craton towards the end of the Neoarchean. This finding supports the hypothesis that the North China Craton may belong to the Rae-family cratons, sharing similar magmatic and tectono-metamorphic records around ~2.5 billion years ago. Full article
(This article belongs to the Special Issue Geochemistry and Geochronology of High-Grade Metamorphic Rocks)
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