岩石矿物学杂志2025，Vol.44Issue(6)：1285-1301,17.DOI:10.20086/j.cnki.yskw.2025.4166
东昆仑都兰三叠纪花岗质侵入体中磷灰石地球化学组成及其对岩石成因的指示
Geochemical compositions of apatites in the Dulan Triassic granitic intrusions from the East Kulun Mountains and implications for the petrogenesis
摘要
Abstract
As one of the ubiquitous accessory mineral in granitoids,apatite can effectively monitor the variation of the parental magmatic melt and volatiles and serves as an important tool for tracing the petrogenesis of granitic intru-sions and the related magmatic process.This paper conducts micro-area structure and in-situ major and trace element geochemical analysis of the apatite from the Haisigou monzogranite and granodiorite in the East Kunlun Mountains,and combines partial whole-rock geochemical studies to meticulously analyze the genetic types,magmatic physical and chemical conditions,and their evolutionary processes of granites.Furthermore,it explores the formation and e-volution mechanisms of granitic intrusions.The results show that apatites in the monzogranite exhibit obvious oscil-latory zonation,while apatites in the granodiorite lack any types of zonation.And all the apatites in the monzogran-ite and granodiorite show similar characteristics to rich-F apatites in composition.The apatite major and trace ele-ment compositions and whole-rock geochemical data reveal that the granodiorite has similar geochemical characteris-tics to Ⅰ-type granites,while the monzogranite has compositions comparable to I-S transitional-type granites.The chemical variations of apatite zonations reveal that the magma reservoir of monzogranite was influenced by the melt component,heat and volatiles of mafic magmas,while the granodiorite magma reservoir is more likely to be affected by the heat and volatiles of the mafic magmas,and the participation of the mafic component is negligible.Com-bined with new regional studies,the Haisigou Triassic granitic intrusions might form accompanied with the slab break off at the late stage of the subduction of the Paleo-Tethys Ocea.In this context,the magmas in those reser-voirs experienced crystal-melt segregations under the varying degrees of mafic magma recharge,and ultimately formed the monzogranite and granodiorite with cumulate affinities.关键词
磷灰石/花岗岩/岩石成因/岩浆演化/东昆仑Key words
apatite/granites/petrogenesis/magma evolution/East Kunlun分类
天文与地球科学引用本文复制引用
吴栾,刘彬,马昌前,薛振华,孙洋,黄贵治..东昆仑都兰三叠纪花岗质侵入体中磷灰石地球化学组成及其对岩石成因的指示[J].岩石矿物学杂志,2025,44(6):1285-1301,17.基金项目
国家自然科学基金项目(42572055,42130309,41502050,41972066) National Natural Science Foundation of China(42572055,42130309,41502050,41972066) （42572055,42130309,41502050,41972066）
