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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:

2020年第01期

Page:

36-48

Research Field:

基础地质与矿产地质

Publishing date:

Info

Title:

Origin of Tuffs from Upper Permian Wujiaping Formation in Chaotian Section of Guangyuan Area, Sichuan, China and Its Geological Significance

Author(s):

ZHANG Han;  HUANG Hu^*;  HOU Ming-cai

(Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China)

Keywords:

geochemistry;  tuff;  zircon U-Pb age;  Hf isotope;  Wujiaping Formation;  Emeishan large igneous province;  Sichuan

PACS:

P588.14; P597

DOI:

10.19814/j.jese.2019.08010

Abstract:

The tuffs from Upper Permian Wujiaping Formation in Chaotian section of Guangyuan area, Sichuan are located above Wangpo claystone beds at the top of Maokou Formation, the origin of tuffs may provide a good chance to constrain the age of Emeishan large igneous province volcanism. Mineral contents, whole-rock geochemical characteristics and zircon U-Pb age, trace element and Hf isotopic composition for two tuff samples from Wujiaping Formation in Chaotian section were analyzed to discuss the sources and its geological significance for the age of Emeishan large igneous province volcanism. The results show that the tuffs from Upper Permian Wujiaping Formation in Chaotian section of Guangyuan area with zircon U-Pb age of(260.1±2.8)Ma, are dominated by clay minerals, and have high Al₂O₃/TiO₂ ratios(37.90 and 31.49), strong negative Eu anomalies(Eu/Eu^* ratios are 0.13 and 0.06), and no negative Nb and Ta anomalies; zircons from the tuffs have high ε_Hf(t)(7.8-11.4)and low Th/Nb ratios(5.4-14.9); the geochemical characteristics are similar to the lower tuffs from Upper Permian in Shangsi section and the acid ignimbrites of Emeishan volcanic sequence in Binchuan section, but different from the ε_Hf(t)and Th/Nb ratios of Wangpo claystone beds in Qingyinge. In general, the tuffs from Upper Permian Wujiaping Formation in Chaotian section of Guangyuan area, Sichuan are related to the acid volcanism of Emeishan large igneous province, and the age of Emeishan large igneous province volcanism may extend to the early period of Late Permian.

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