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First Discovery of Late Triassic Tuffs in the South Qilian Basin: Geochemical Characteristics, Zircon LA-ICP-MS U-Pb Ages and Potential source regions

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Journal of Earth Science 2023年第6期34卷 1692-1703页

作者： Fangpeng Du Furong Tan Shiming Liu Xiaochen Zhao Yingtao Chen Junwei Qiao School of Petroleum Engineering and Environmental Engineering Yan'an UniversityYan'an 716000China China National Administration of Coal Geology Beijing 100038China State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi'an 710069China Key Laboratory of Resource Exploration Research of Hebei Province Hebei University of EngineeringHandan 056038China College of Geology and Environment Xi'an University of Science and TechnologyXi'an 710054China

This investigation reports the first discovery of more than 70 tuff intervals in the Upper Triassic,South Qilian *** and geochemical analyses were carried out on ten tuff samples and zircon U-Pb dating were on *** section and X-ray diffraction(XRD)results indicate that the tuffs were composed of crystal shards and altered glass shards;crystal shards include plagio-clase and *** of the tuffs had been transformed into illite/smectite mixed-layers(I/S).In addition,calcite,pyrite,dolomite and siderite were also identified in some of the tuff *** of major elements suggests that the tuffs are peraluminous high-K calcalkaline *** elements indicate that the tuffs are enriched in high field strength elements(HFSE),including Th,U,Ta,Zr and *** characteristics suggest that the tuffs originated from comendite pantellerite and rhyolite from within plate *** U-Pb dating(236.0±1.7,231.4±1.6,and 223.1±3.9 Ma)indicate that the tuffs were erupted in the Late *** chronology and geochemical analyses suggest that the West Qinling belt and the East Kunlun belt are the potential source regions of these tuffs,and they originated from the within plate magma during a post-collisional period.

关键词： tuff South Qilian Basin Late Triassic U-Pb isotopic dating source regions zircon geo-chemistry

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