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Study on Petrology, Geochemistry and Os-Nd-Sr Isotopes of Jinan Gabbro in Luxi Block(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2013年第02期
Page:
19-31
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Study on Petrology, Geochemistry and Os-Nd-Sr Isotopes of Jinan Gabbro in Luxi Block
Author(s):
GAO Lin CHEN Bin
1. Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871, China; 2. School of Earth and Space Sciences, Peking University, Beijing 100871, China
Keywords:
petrology geochemistry Jinan gabbro Os-Nd-Sr isotopes petrogenesis crustal contamination North China Craton
PACS:
P597
DOI:
-
Abstract:
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 of εNd(t) and ratio of initial Sr isotopic compositions of the mafic pluton suggested that parental magmas were contaminated by Precambrian mafic lower crust during magma emplacement at a deep crustal level.

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Last Update: 2013-06-20