Study on Petrology, Geochemistry and Os-Nd-Sr Isotopes of Jinan Gabbro in Luxi Block
详细信息
- 责任者：Gao Lin (Key Laboratory of Orogenic Belts and Crustal Evolution ; Peking University ; Beijing 100871 ; China) ; Chen Bin
- 刊名：Journal of Earth Sciences and Environment
- 出版年：2013
- 卷期：35(2)
- 关键词：辉长岩 ; gabbros ; 山东 ; Shandong Province
- 页码：p.19-31
- 图表：illus., 5 tables, 54 refs.
- 分类号：0801
- issnNo：ISSN1672-6561
- isbnNo：CN61-1423/P
摘要
nDivSummary">Petrology,geochemistry and Os-Nd-Sr isotopes of Jinan gabbro in Luxi block of eastern block of North China Craton were studied in detail,and diagenetic process,characteristic of mantle source and the role of crustal contamination on evolution process of mantle-derived magma were discussed.Jinan gabbro was rich in LREE and LILE,depleted in HREE and HFSE;radiogenic Os isotopic composition was high for Jinan gabbro,the characteristic of Sr-Nd isotopic composition was EM1-like.The results of petrology and element geochemistry suggested a significant fractional crystallization of olivine+pyroxene+plagioclase in forming the mafic pluton.The characteristics of petrology,geochemistry and Os-Nd-Sr isotopes showed that the parental magmas of Jinan gabbro was hydrous magma system,which originated from an old enriched lithospheric mantle.High radiogenic initial Os isotopic composition and inverse relationship between value ofεNdand ratio of initial Sr isotopic compositions of the mafic pluton suggested that parental magmas were contaminated by Precambrian mafic lower crust duringmagma emplacement at a deep crustal level.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |