Geochemistry of Garnet-Mica Schist in the Wutai Group and Its Geological Implications
详细信息
- 责任者：Qian Jiahui (Key Laboratory of Orogenic Belts and Crustal Evolution ; Ministry of Education ; School of Earth and Space Sciences ; Peking University ; Beijing 100871 ; China) ; Wei Chunjing
- 刊名：Acta Petrologica et Mineralogica
- 出版年：2013
- 卷期：32(4)
- 关键词：黑云母片岩 ; biotite schist ; 白云母片岩 ; muscovite schist ; 五台山 ; Wutai Mountains
- 页码：p.405-416
- 图表：6 illus., 2 tables, 60 refs.
- 分类号：0802
- issnNo：ISSN1000-6524
- isbnNo：CN11-1966/P
摘要
Garnet-mica schist from the Shizui Subgroup of Wutai Group is chiefly composed of garnet, biotite, muscovite, plagioclase, quartz and ilmenite, with a few samples containing epidote, staurolite, kyanite and ortho-amphibole. Based on a series of diagrams such as geochemical classification, heavy mineral accumulation, source rock and tectonic setting discrimination, the authors found that the protolith of the rocks was shales without obvious heavy mineral accumulation. Combined with the results of metamorphic equilibria modeling using THERMOCALC method and metamorphic zircon dating using SHRIMP method, the authors have found that the garnet-mica schist experienced a kyanite-type metamorphism with a clockwise p-t path at ~1.95 Ga.