Behavior of apatite in granitic melts derived from partial melting of muscovite in metasedimentary sources

作     者：Li-E Gao Ling-sen Zeng Ling-hao Zhao Jia-hao Gao Zhen Shang Li-E Gao;Ling-sen Zeng;Ling-hao Zhao;Jia-hao Gao;Zhen Shang

作者机构：Key Laboratory of Deep-Earth Dynamics of Ministry of Natural ResourcesInstitute of GeologyChinese Academy of Geological SciencesBeijing 100037China National Research Center for GeoanalysisChinese Academy of Geological ScienceBeijing 100037China 

出 版 物：《China Geology》 (中国地质（英文）)

年 卷 期：2021年第4卷第1期

页      面：44-55页

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 07[理学] 0908[农学-水产] 0710[理学-生物学] 070901[理学-矿物学、岩石学、矿床学] 0707[理学-海洋科学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0815[工学-水利工程] 0705[理学-地理学] 0816[工学-测绘科学与技术] 0813[工学-建筑学] 0814[工学-土木工程] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supported by National Natural Science Foundation of China(41873023,41425010 and 92055202) The Second Tibetan Plateau Scientific Expedition and Research program(2019QZKK070203) National Key Research and Development Project of China(2016YFC0600304) China Geological Survey(DD20190057). 

主　　题：Apatite Partitioning coefficient Crustal anatexis Leucogranite Malashan Dome Tethyan Himalaya Geological survey engineering Tibet 

摘      要：Fluid-absent and fluid-fluxed melting of muscovite in metasedimentary sources are two types of crustal anatexis to produce the Himalaya Cenozoic leucogranites.Apatite grains separated from melts derived from the two types of parting melting have different geochemical compositions.The leucogranites derived from fluid-fluxed melting have relict apatite grains and magmatic crystallized apatite grains,by contrast,there are only crystallized apatite grains in the leucogranites derived from fluid-absent melting.Moreover,apatite grains crystallized from fluid-fluxed melting of muscovite contain higher Sr,but lower Th and LREE than those from fluid-absent melting of muscovite,which could be controlled by the distribution of partitioning coefficient(D_(Ap/Melt))between apatite and leucogranite.D_(Ap/Melt) in granites derived from fluidabsent melting is higher than those from fluid-fluxed melting.So,not only SiO_(2) and A/CNK,but also types of crustal anatexis are sensitive to trace element partition coefficients for apatite.In addition,due to being not susceptible to alteration,apatite has a high potential to yield information about petrogenetic processes that are invisible at the whole-rock scale and thus is a useful tool as a petrogenetic indicator.