[an error occurred while processing this directive] Global Geology 2020, 23(3) 180-190 DOI:   10.3969/j.issn.1673-9736.2020.03.06  ISSN: 1673-9736 CN: 22-1371/P

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本文关键词相关文章
tonalite
Neoarchean
petrogenesis
Hf isotope
North China Craton
本文作者相关文章
HAO Leran
YANG Haotian
YANG Donghong
PubMed
Article by Hao L
Article by Yang H
Article by Yang D
U-Pb-Hf isotopes of Neoarchean Shuimowan tonalites in southern margin of North China Craton: constraints on petrogenesis
HAO Leran1, YANG Haotian1, YANG Donghong2
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. International Center for Geoscience Research and Education in Northeast Asia, Jilin University, Changchun 130026, China
摘要: This study presents zircon LA-ICP-MS U-Pb geochronology, trace elements characteristics, whole rock geochemistry composition and zircon Hf isotopic data of Shuimowan tonalites in Dengfeng City. The results show that zircons from Shuimowan tonalites have oscillatory growth zoning, relatively high Th/U ratios (0.8-1.7) and upturned zircon rare earth elements (REE), indicating that they are magmatic origin. Shuimowan tonalites yield a weighted mean 207Pb/206Pb age of 2 522 ±9 Ma, indicating they were formed in the latest Neoarchean. The tonalites are characterized by relatively low SiO2 contents, high MgO and Na2O contents, high REE (∑REE = 322×10-6-354×10-6), obvious fractionation of REE, enrichment in LREE and feeble negative Eu anomaly (Eu/Eu* = 0.97-0.99). The samples are also enriched in large ion lithophile elements and depleted in high field strength elements, with negative Nb, Ta, P and Ti anomalies. The εHf(t) values of zircon grains from Shuimowan tonalites range between 3.5 and 5.3. Combined with regional tectonic evolution, it is suggested that Shuimowan tonalites were derived from partial melting of mantle peridotite metasomatized by the slab-derived felsic melt and formed in the arc magma tectonic setting related to plate subduction. Research on the Neoarchean Shuimowan tonalites provides a constraint for the study of the Pre-Cambrian tectonic evolution in the southern margin of North China Craton.
关键词 tonalite   Neoarchean   petrogenesis   Hf isotope   North China Craton  
U-Pb-Hf isotopes of Neoarchean Shuimowan tonalites in southern margin of North China Craton: constraints on petrogenesis
HAO Leran1, YANG Haotian1, YANG Donghong2
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. International Center for Geoscience Research and Education in Northeast Asia, Jilin University, Changchun 130026, China
Abstract: This study presents zircon LA-ICP-MS U-Pb geochronology, trace elements characteristics, whole rock geochemistry composition and zircon Hf isotopic data of Shuimowan tonalites in Dengfeng City. The results show that zircons from Shuimowan tonalites have oscillatory growth zoning, relatively high Th/U ratios (0.8-1.7) and upturned zircon rare earth elements (REE), indicating that they are magmatic origin. Shuimowan tonalites yield a weighted mean 207Pb/206Pb age of 2 522 ±9 Ma, indicating they were formed in the latest Neoarchean. The tonalites are characterized by relatively low SiO2 contents, high MgO and Na2O contents, high REE (∑REE = 322×10-6-354×10-6), obvious fractionation of REE, enrichment in LREE and feeble negative Eu anomaly (Eu/Eu* = 0.97-0.99). The samples are also enriched in large ion lithophile elements and depleted in high field strength elements, with negative Nb, Ta, P and Ti anomalies. The εHf(t) values of zircon grains from Shuimowan tonalites range between 3.5 and 5.3. Combined with regional tectonic evolution, it is suggested that Shuimowan tonalites were derived from partial melting of mantle peridotite metasomatized by the slab-derived felsic melt and formed in the arc magma tectonic setting related to plate subduction. Research on the Neoarchean Shuimowan tonalites provides a constraint for the study of the Pre-Cambrian tectonic evolution in the southern margin of North China Craton.
Keywords: tonalite   Neoarchean   petrogenesis   Hf isotope   North China Craton  
收稿日期 2020-04-02 修回日期 2020-06-06 网络版发布日期  
DOI: 10.3969/j.issn.1673-9736.2020.03.06
基金项目:

Supported by projects of the Natural Science Foundation of China (41722204) and Basic Scientific Research Foundation of Central Universities of China (Jilin University).

通讯作者: YANG Donghong
作者简介:
作者Email: yangdonghong@jlu.edu.cn

参考文献:
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