Petrogenetic model of the Permian Tarim Large Igneous Province

作     者：YU Xing YANG ShuFeng CHEN HanLin LI ZiLong LI YinQi 

作者机构：Key Lab of Seabed GeosciencesSecond Institute of OceanographyState Oceanic Administrator School of Earth SciencesZhejiang University 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2017年第60卷第10期

页      面：1805-1816页

核心收录：

学科分类：081803[工学-地质工程] 0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the Natural Science Foundation of Zhejiang Province(Grant No.LY17D020001) the Fundamental Research Program(Grant Nos.JG1518&2017QNA3015) the National Natural Science Foundation of China(Grant Nos.41506070,41603029) 

主　　题：Large igneous province Early Permian Two types of basalts Petrogenetic model Tarim Basin 

摘      要：Over the last two decades great strides have been made in characterizing the spatial distribution, time sequence,geochemical characteristics, mantle sources, and magma evolution processes for various igneous rocks in the Early Permian Tarim Large Igneous Province(TLIP). This work has laid a solid foundation for revealing the evolutionary processes and genetic models of large igneous provinces(LIPs). This study systematically demonstrates the two-stage melting model for the TLIP based on our previous research work and predecessor achievements, and highlights the two types of magmatic rocks within the *** two-stage melting model suggests that the formation of the TLIP is mantle plume related. The early hot mantle plume caused the low-degree partial melting of the lithosphere mantle, while in the later stage, the plume partially melted due to adiabatic uplift and decompression. Therefore, this model carries signatures of both the Parana and Deccan models in terms of mantle plume activity. During the early stage, the mantle plume provided the heat required for partial melting of sub-continental lithosphere mantle(SCLM), similar to the Parana Model, while later the plume acted as the main avenue for melting, as in the Deccan Model. Basalts that erupted in the first stage have higher 87Sr/86 Sr, lower 143Nd/144 Nd ratios, and are enriched in large ion lithophile elements and high field strength elements, indicating a possible origin from the enriched continental lithosphere mantle,similar to the Parana type geochemical features. The basic-ultrabasic intrusive rocks in the second stage exhibit lower 87Sr/86 Sr,higher 143Nd/144 Nd ratios relative to the basalts, consistent with the involvement of a more depleted asthenospheric material,such as a mantle plume, similar to the Deccan type geochemical features. The first stage basalts can be further subdivided into two categories, i.e., Group 1 and Group 2 basalts. Group 2 basalts have lower 87Sr/86 Sr and higher 1