Provenance of the Lower Triassic Feixianguan Formation in southwestern Guizhou Province and reconstruction of volcanic denudation sequence in the Emeishan large igneous province

被引：0
作者：
Zhou Y. [1 ]
Yang J. [1 ]
Huang Y. [1 ]
Liu J. [2 ]
Qi L. [3 ]
Deng X. [4 ]
机构：
[1] School of Earth Sciences, China University of Geosciences, Hubei, Wuhan
[2] Bureau of Geology and Mineral Exploration and Development Guizhou Province, Guizhou, Guiyang
[3] 105 Geological Brigade, Bureau of Geology and Mineral Exploration and Development Guizhou Province, Guizhou, Guiyang
[4] Guizhou Geological Survey, Bureau of Geology and Mineral Exploration and Development Guizhon Province, Guizhou, Guiyang
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2022年 / 96卷 / 07期
关键词：
Early Triassic; Emeishan large igneous province; magma evolution; provenance analysis; southwestern Guizhou;
D O I：
10.19762/j.cnki.dizhixuebao.2022272
中图分类号：
学科分类号：
摘要：
The Emeishan large igneous province (LIP) suffered intense weathering and denudation after its formation, and formed a unique source- sink depositional system with the Youjiang basin. The relevant clastic sedimentary records are the key to reconstruct the late volcanic sequence and reveal the Emeishan LIP magmatic evolution. In this paper, a detailed study on the provenance of the Lower Triassic Feixianguan Formation in the northern margin of the Youjiang basin in southwestern Guizhou Province was carried out. The mudstones of the Feixiaguan Formation are composed of feldspar, quartz and clay minerals. It is characterized by low SiO2, high TiO2content and low Al2O3/TiO2ratio. It shows weak negative Eu anomalies on the REE distribution patterns, and weak negative Nb- Ta anomalies on the primitive- mantle normalized trace element spider diagram. Based on Al2O3/TiO2and La/Sm ratios analysis, the main provenance of the samples is composed of high- Ti basalts and a small amount of silicic volcanic rocks from the Emeishan large igneous province, which is consistent with the Late Permian clastic provenance in the Youjiang basin. Detrital zircons have a peak age of ~260 Ma, and the corresponding zircons have lower Th/Nb and higher Nb/Hf ratios, which support the Emeishan LIP as the main sediment source area. The detrital zircons with ages of>400 Ma correspond to the crustal materials captured during the ascent of the ELIP basaltic magma. Compared with the U- Pb age and geochemical composition of detrital zircons from the Upper Permian, the volcanic rocks denuded from Late Permian to Early Triassic formed a certain volcanic sequence, reflecting the magmatic evolution process from strong crustal assimilation to fractional crystallization in the late- stage of the ELIP. © 2022 Geological Society of China. All rights reserved.
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页码：2348 / 2364
页数：16
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