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Geochemical Characteristics of Early Permian pyroclastic rocks in the Jimunai Basin,West Junggar,Xinjiang(NW China):Implications for Provenance and Tectonic Setting

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Acta Geologica Sinica(English Edition) 2021年第3期95卷 794-809页

作者： SHANGGUAN Yunfei ZHUANG Xinguo LI Baoqing LI Jing QUEROL Xavier LIU Shunbin Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of GeosciencesWuhan 430074China Institute of Environmental Assessment and Water Research IDÆA-CSIC C/Jordi Girona18–26Barcelona 08034Spain Xinjiang Bureau of Prospecting and Development of Geology and Mineral Resources Urumqi 830000China

During the Late Paleozoic,West Junggar(Xinjiang,NW China)experienced a shift in tectonic setting from compression to ***'erjiao is an important area for investigating collisional structures,post–collisional structures,and magmatic *** on the petrological and geochemical characteristics of pyroclastic and other volcanic rocks in the Permian Kalagang Formation from the borehole ZKH1205 in the Jimunai Basin,the main types of source rock for the pyroclastic rocks deposited in the basin are identified and their implications for the Early Permian tectonic setting *** abundance of basalt and andesite lithic fragments in the pyroclastic rocks,together with the REE characteristics and the contents of transition and high field strength elements show that the source rocks were chiefly intermediate–basic volcanic *** ICV values,low CIA values,low Rb/Sr ratios,low Th/U ratios and the mineralogical features suggest weak chemical weathering of the source rocks;the geochemical patterns of the pyroclastic rocks might not only have been impacted by crustal contamination but also might be related to the nature of the magma from the source *** geochemical properties of the pyroclastic rocks distinguish them from arc-related ones,and such samples plot in the within-plate basalt(WPB)field in some *** is consistent with the formation background of the Early Permian volcanic rocks in this region.

关键词： pyroclastic rock provenance tectonic setting Kungurian Central Asian Orogenic Belt

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Constrains of eruption environment and hydrothermal fluid on the Permian pyroclastic reservoirs in the Sichuan Basin,SW China

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Petroleum 2022年第1期8卷 17-30页

作者： Xiaohong Liu Yiqian Zhuo Mingyou Feng Benjian Zhang Maolong Xia Xingzhi Wang School of Geoscience and Technology Southwest Petroleum UniversityChengdu610500China Natural Gas Geology Key Laboratory of Sichuan Province Chengdu610500China Northwest Sichuan Mining District PetroChina Southwest Oil and Gas Filed CompanyJiangyou621709China PetroChina Southwest Oil and Gas Field Company Exploration and Development Research Institute Chengdu610041China

A breakthrough has been recently made in the hydrocarbon exploration of the Permian pyroclastic rocks in the Jianyang Area,western Sichuan Basin,*** an aim to decipher the impacts of the eruption environment,the temperature of hydrothermal fluids,and the paleo-salinity on the formation of authigenic mineral assemblage and pores,this study implements comprehensive petrographic and geochemical studies through the integrated core and thin section *** data presented demonstrate that the Permian volcanic intervals are intensively affected by an event of Emei *** basaltic magma upward migration,fractional crystallization of anorthose results in slightlyalkaline *** specific pyroclastic rocks are formed by the eruption of slightly-alkaline magma in the sea or a salt lake and subsequent hydrothermal *** deposition and diagenesis,the authigenic mineral association is constrained jointly by the sodium-rich and high salinity water environment,and mid-high temperature,high-salinity hydrothermal ***,the sodium-rich hydrothermal fluid,which may sustain till the late diagenesis stage,caused pervasive albitization of pyroclastic rocks,then leading to mineral transformation and formation of a series of mineral ***,zeolitization of volcanic glass and vesicle-infillings of zeolite is an essential condition for later mineral transformation and *** of analcite,recrystallization induced by deep hydrothermal fluids,and both meteoric and deep burial dissolution expanding the micro-pore space ultimately formed porous pyroclastic reservoirs.

关键词： Permian pyroclastic rock Eruption environment Hydrothermal fluid Sichuan basin Southwest China

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