首页 | 本学科首页   官方微博 | 高级检索  
     检索      

云开地块晚二叠世富Fe-Ti-P超镁铁质岩的年代学、地球化学与岩石成因
引用本文:周岱,柯贤忠,王祥东,王磊,王晶.云开地块晚二叠世富Fe-Ti-P超镁铁质岩的年代学、地球化学与岩石成因[J].地球科学,2021,46(4):1295-1310.
作者姓名:周岱  柯贤忠  王祥东  王磊  王晶
作者单位:中国地质调查局武汉地质调查中心,湖北武汉 430205;中国地质调查局花岗岩成岩成矿地质研究中心,湖北武汉 430223
基金项目:中国地质调查局地质调查项目
摘    要:为了更好地理解华南板块南缘二叠纪与三叠纪之交复杂的构造格局,通过岩石学、地球化学和年代学的方法,对粤西云开地区新发现的3处晚二叠世超镁铁质侵入岩进行了研究.这些岩石位于云开地块东缘的阳春三甲和地块中部的高州大井、东岸等地,呈小岩株、岩脉产出于云开岩群的片岩、变粒岩中.它们的主要岩性为辉石岩、角闪石岩、角闪岩和斜长角闪岩...

关 键 词:云开地块  超镁铁质  峨眉山地幔柱  锆石Hf-O同位素  地球化学
收稿时间:2020-06-15

Geochronology,Geochemistry and Petrogenesis of Late Permian Fe-Ti-P-Rich Ultramafic Rocks in Yunkai Terrane,South China
Zhou Dai,Ke Xianzhong,Wang Xiangdong,Wang Lei,Wang Jing.Geochronology,Geochemistry and Petrogenesis of Late Permian Fe-Ti-P-Rich Ultramafic Rocks in Yunkai Terrane,South China[J].Earth Science-Journal of China University of Geosciences,2021,46(4):1295-1310.
Authors:Zhou Dai  Ke Xianzhong  Wang Xiangdong  Wang Lei  Wang Jing
Abstract:In order to better understand the complex tectonic framework on the southern margin of South China block (SCB) between Permian and Triassic, the petrology, geochemistry and chronology of three newly discovered Late Permian ultramafic intrusions in the Yunkai area of West Guangdong were studied. These rocks are located at Yangchun Sanjia on the eastern edge of the Yunkai terrane and at Gaozhou Dajing and Dong'an in the middle of the Yunkai terrane. They are intrusive rocks in schist and paragneiss of the Yunkai Group and out putted as laccoliths or dykes which main lithologies are pyroxenite, hornblendite, amphibolite and plagioclase amphibolite. Zircon SHRIMP and LA-ICP-MS U-Pb age of ultramafic rocks are 253-259 Ma. These intrusive rocks are rich in titanomagnetite, titanite and apatite, showing strong enrichment of Fe-Ti-P, and exhibiting moderate enrichment of LREE and depletion in Nb-Ta-Zr-Hf. Ultramafic rocks exhibit relatively low εNd(t)(-3.4 to -10.0) of whole rocks, εHf(t) (-1.2 to -9.5) and δ18O(7.01‰-9.71‰) values of zircon, showing the enriched lithosphere mantle source affinity. In this study, it is suggested that the influence range of Permian Emeishan mantle plume(~259 Ma) may have spread to Yunkai area. Yunkai Late Permian ultramafic intrusions are generated from the partial melting of the lithospheric mantle which resulted from heat flow of mantle plume. Fe-Ti-P-rich minerals were assembled at the late stage of magma crystallization. 
Keywords:
本文献已被 CNKI 万方数据 等数据库收录!
点击此处可从《地球科学》浏览原始摘要信息
点击此处可从《地球科学》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号