文献类型：期刊文献

英文题名：Provenance of the Nb-rich bauxite and Li-rich claystone at the base of the Heshan Formation in Pingguo, Guangxi, SW China: Constrained by U-Pb ages and trace element contents of detrital zircon

作者：Zhao, Haonan Ling, Kunyue Du, Shengjiang Wen, Hanjie

第一作者：Zhao, Haonan

通信作者：Ling, KY[1]

机构：[1]China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China;[2]Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China;[3]Guizhou Inst Technol, Sch Min Engn, Guiyang 550003, Peoples R China;[4]Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China;[5]Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China

第一机构：China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China

通信机构：corresponding author), Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China.

年份：2023

卷号：161

外文期刊名：ORE GEOLOGY REVIEWS

收录：;EI(收录号：20233514659255);Scopus(收录号：2-s2.0-85169011936);WOS:【SCI-EXPANDED(收录号:WOS:001082336300001)】；

基金：This work was supported by the National Natural Science Foundation of China (grants 92062107, 92162214, 41903038, and 41962005), the Key R&D Program of the Yunan Province (grant 202103AQ100003),and the Guizhou Provincial Science and Technology Project (ZK [2021] key program 046).r and the Guizhou Provincial Science and Technology Project (ZK [2021] key program 046) .

语种：英文

外文关键词：Detrital zircon; U-Pb dating; Niobium; Lithium; Heshan Formation

摘要：The base of the Upper Permian Heshan Formation in Pingguo County, Guangxi Province, SW China, can be divided into two layers: a lower Nb-rich bauxite layer and an upper Li-rich claystone layer. The sources of these layers may have played a critical role in their formation. Detrital zircon provenance analysis is an effective method for identifying sediment provenance; however, it has not been applied previously to the Nb-rich bauxite and Li-rich claystone, thus limiting our knowledge of the sources of these two layers. Detrital zircons from the bauxite and the claystone layers yield a single age peak at similar to 260 Ma, which is consistent with the age of the Emeishan Large Igneous Province (LIP; 263-257 Ma) and the Permian Palaeo-Tethyan magmatic arcs (300-260 Ma). In contrast, detrital zircons from the two layers yield different trace element signatures. Yttrium and Hf contents and U/Yb ratios of detrital zircon grains from the bauxite layer overlap with those of continental and oceanic crust and have similar Hf/Th, Th/Nb, Th/U, and Nb/Hf ratios to those of zircons of within-plate and magmatic arc origins. These results indicate that the bauxite was sourced from volcanic rocks or ash related to the Emeishan LIP and the Permian Palaeo-Tethyan magmatic arcs. However, detrital zircons from the claystone have similar Hf/Th, Th/Nb, Th/U, and Nb/Hf ratios to only those of zircon from magmatic arcs, suggesting a single Permian Palaeo-Tethyan magmatic arc source. Thus, our results reveal an abrupt change in the provenance of zircons at the base of the Heshan Formation. The lower Nb-rich bauxite layer was derived from the weathering of volcanic rocks or ash related to the Emeishan LIP and the Permian Palaeo-Tethyan magmatic arcs, whereas the upper Li-rich claystone layer was derived principally from the weathering of volcanic ash related to the Permian Palaeo-Tethyan magmatic arcs. Since Nb is an immobile element, volcanic rocks/ash related to the Emeishan LIP and the Permian magmatic arc could represent a source for bauxite and Nb. In contrast, Li is chemically highly mobile in the Earth's surface environment and its origin cannot be constrained easily, further work is needed to identify the sources of Li.