江西崇义铁木里钨铁矿区内辉绿玢岩的年代学、地球化学特征及地质意义

郭娜欣; 刘善宝; 赵正

doi:10.3799/dqkx.2020.087

Volume 46 Issue 2

Feb. 2021

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Guo Naxin, Liu Shanbao, Zhao Zheng, 2021. Geochronology, Geochemistry and Geological Implications of Diabase Porphyrite in Tiemuli W-Fe Deposit, Chongyi County, Jiangxi Province. Earth Science, 46(2): 460-473. doi: 10.3799/dqkx.2020.087

Citation:

Guo Naxin, Liu Shanbao, Zhao Zheng, 2021. Geochronology, Geochemistry and Geological Implications of Diabase Porphyrite in Tiemuli W-Fe Deposit, Chongyi County, Jiangxi Province. Earth Science, 46(2): 460-473. doi: 10.3799/dqkx.2020.087

Citation:

Guo Naxin, Liu Shanbao, Zhao Zheng, 2021. Geochronology, Geochemistry and Geological Implications of Diabase Porphyrite in Tiemuli W-Fe Deposit, Chongyi County, Jiangxi Province. Earth Science, 46(2): 460-473. doi: 10.3799/dqkx.2020.087

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Geochronology, Geochemistry and Geological Implications of Diabase Porphyrite in Tiemuli W-Fe Deposit, Chongyi County, Jiangxi Province

doi: 10.3799/dqkx.2020.087

Guo Naxin^{1, 2
,
,},
Liu Shanbao²,
Zhao Zheng²

1.
MNR Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Chang'an University, Xi'an 710054, China
2.
MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources of Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 2019-09-17
Publish Date: 2021-02-15

Abstract

Abstract

The Mesozoic basic igneous rock in South China is dominated by tholeiite series, while the alkali series is rare. Bimodal intrusive pluton composed of alkali diabase porphyrite and A-type granite occurs in Tiemuli area, Chongyi County, Jiangxi Province. Mineralogical, geochronological and geochemical analyses of the diabase porphyrite were carried out. The Tiemuli diabase porphyrite displays porphyritic texture.Phenocrysts are dominated by salite, with minor diopside and augite, while groundmass minerals comprise andesite (with Ab values of 39.11%-43.30%), kaersutite and clinopyroxene chemically equivalent to phenocrysts. The diabase porphyrite was emplaced after the granite (136.6 Ma) and belongs to alkali basalt series, characterized by low SiO₂ (41.73%-46.68%) and TiO₂ (1.72%-1.94%) contents, high TFeO (7.64%-9.24%), Al₂O₃ (15.70%-17.22%) and alkali (5.28%-6.60%) contents, and moderate Mg^# values (molar ratios of MgO/(MgO+TFeO), 0.51-0.54). The fractionation between light rare earth elements (LREEs) and high rare earth elements (HREEs) and fractionation of LREEs are remarkable ((La/Yb)_N=17.58-22.28, (La/Sm)_N=4.72-5.18), while the Eu anormalies are negligible (δEu=0.84-0.99). All rocks are significantly enriched in large iron lithophile elements (LILEs) and are slightly enriched in high field strength elements (HFSEs), with lower contents of transition elements than primitive mantle. They have ε_Nd, (⁸⁷Sr/⁸⁶Sr)_i, (²⁰⁶Pb/²⁰⁴Pb)_i, (²⁰⁷Pb/²⁰⁴Pb)_i and (²⁰⁸Pb/²⁰⁴Pb)_i values of +3.45, 0.707 5, 18.769 9, 15.733 7 and 39.110 0, respectively, displaying transitional features between OIB and EMII. Mineralogical, geochemical and Nd-Hf isotopic characteristics suggest that the Tiemuli diabase porphyrite was generated in asthenosphere and the partial melting took place in garnet stability field. The alkali basalt magma was derived from small degree of decompression melting of depleted asthenospheric mantle and contamination of crustal materials was minor. Fractional crystallization of clinopyroxene, apatite and Fe-Ti oxides took place during the basaltic magma evolution. Some enriched components from lithospheric mantle might be involved in. The Cretaceous alkali basaltic rocks developed interior of South China were formed in intracontinental extension (rift-like) regime related to regional lithospheric extension and deep-penetrating faults.
- alkali diabase porphyrite,
- Cretaceous,
- asthenospheric mantle melting,
- lithospheric extension,
- Tiemuli,
- Jiangxi Province,
- geochemistry,
- geochronology

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Geochronology, Geochemistry and Geological Implications of Diabase Porphyrite in Tiemuli W-Fe Deposit, Chongyi County, Jiangxi Province

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