赣东北蛇绿混杂岩岩石地球化学特征及构造意义

周文婷; 郭国林; 刘晓东; 伍俊杰; 林杰; 付锋

doi:10.3799/dqkx.2016.006

Volume 41 Issue 1

Jan. 2016

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Article Navigation > Earth Science > 2016 > 41(1): 84-96

Zhou Wenting, Guo Guolin, Liu Xiaodong, Wu Junjie, Fu Feng, Lin Jie, 2016. Geochemical Characteristics and Tectonic Significances of the Rocks from Northeastern Jiangxi Ophiolite. Earth Science, 41(1): 84-96. doi: 10.3799/dqkx.2016.006

Citation:

Zhou Wenting, Guo Guolin, Liu Xiaodong, Wu Junjie, Fu Feng, Lin Jie, 2016. Geochemical Characteristics and Tectonic Significances of the Rocks from Northeastern Jiangxi Ophiolite. Earth Science, 41(1): 84-96. doi: 10.3799/dqkx.2016.006

Citation:

Zhou Wenting, Guo Guolin, Liu Xiaodong, Wu Junjie, Fu Feng, Lin Jie, 2016. Geochemical Characteristics and Tectonic Significances of the Rocks from Northeastern Jiangxi Ophiolite. Earth Science, 41(1): 84-96. doi: 10.3799/dqkx.2016.006

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Geochemical Characteristics and Tectonic Significances of the Rocks from Northeastern Jiangxi Ophiolite

doi: 10.3799/dqkx.2016.006

Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China Institute of Technology, Fuzhou 344000, China

Received Date: 2015-09-01
Publish Date: 2016-01-15

Abstract

Abstract

The harzburgites and basalts from northeastern Jiangxi ophiolite belt have been investigated in the present study, with the aim to review Neoproterozoic tectonic environment. The results show that harzburgites are characterized by low TiO₂ (0.02%-0.37%), K₂O (0-0.02%) and Na₂O (0.02%-0.10%), along with high MgO (40.81%-44.58%) and ignition loss (10.09%-13.47%), suggesting that the harzburgites suffered intensive alteration. The Chondrite-normalized REE patterns and primitive-normalized spider diagrams indicate that the harzburgites are sourced from a depleted mantle source suffered metasomatism in subduction zones. The data suggest that the meta-basalts are mostly characterized by high SiO₂ (52.63%-52.63%), Al₂O₃ (13.07%-15.27%), Na₂O (3.42%-5.03%) and low MgO (3.66%-6.46%), with medium TiO₂ (1.14%-2.66%) contents, indicating that they are of andesitic basalt rocks. In a Chondrite-normalized REE plots, andesitic basalt rocks are rich in LREE((La/Yb)_N=1.84-2.61) with smoothly right declined trend. The trace elements are characterized by enrichment in LILE such as Th, Ba, U and Pb and depletion in HFSE like Nb and Ti, indicating that andesitic basalts are derived from partial melting of enriched mantle wedge metasomatized by slab fluid in subduction belt, and the TNT (Ta, Nb, Ti) negative anomalies also imply those rocks may be contaminated by crustal materials. These geochemical characteristics indicate that the northeastern Jiangxi ophiolitic may have experienced multi-stage tectonic evolution. Harzburgites with LREE enrichments result from fluid metasomatism under intraoceanic subduction process in ancient Huanan ocean. Subsequently, island-arc tholeiite basalts and MORB-like basalts formed in the stage of back-arc basin evolution and those andesitic basalts contaminated with crustal materials, show strong enrichment of LREE, and with high Pb and low Ti.
- harzburgite,
- basalt,
- geochemical characteristics,
- tectonic setting,
- ophiolite,
- petrology

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References(71)

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Geochemical Characteristics and Tectonic Significances of the Rocks from Northeastern Jiangxi Ophiolite

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