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Mesozoic lamprophyre and its origin in the Xikuangshan district, central Hunan
Hu AXiang; Peng JianTang
2016
Source PublicationActa Petrologica Sinica
Volume32Issue:7Pages:2041-2056
AbstractThe giant Xikuangshan deposit, located in central Hunan, is the largest antimony deposit in the world, and is titled as Capital of Antimony. Lamprophyre is the only igneous rocks in the Xikuangshan district. In this paper, we use petrological and geochemical data to constrain nature of the mantle source, petrogenesis and tectonic setting of the lamprophyres, as well as its relations with the antimony mineralization in the Xikuangshan deposit. The lamprophyre in this study is calc-alkaline rocks. They have high TiO2, and low Al2O, and MgO. They are characterized by enrichment of LILE and LREE and depletion of HFSE. They also have high (Sr-87/Sr-86)(i) ratios and low epsilon(Nd)(t) values. These geochemical features are similar to the melts derived from EM2-type mantle source. The rocks experienced fractional crystallization of olivine and plagioclase without significant crustal contamination during their emplacement. Therefore, parental magma of the lamprophyres was probably derived from the phlogopite-bearing lherzolite in garnet stability field; the ancient lithospheric mantle was variably metasomatized by hydrous fluids from subducted oceanic sediments. The magmas quickly emplaced along the extensional fault in the rift setting during the Cretaceous. There is no genetic relationship between the magmatism and the antimony mineralization in the Xikuangshan district.
Subject Area矿床地球化学
Indexed By其他
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/6523
Collection矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文
Recommended Citation
GB/T 7714
Hu AXiang,Peng JianTang. Mesozoic lamprophyre and its origin in the Xikuangshan district, central Hunan[J]. Acta Petrologica Sinica,2016,32(7):2041-2056.
APA Hu AXiang,&Peng JianTang.(2016).Mesozoic lamprophyre and its origin in the Xikuangshan district, central Hunan.Acta Petrologica Sinica,32(7),2041-2056.
MLA Hu AXiang,et al."Mesozoic lamprophyre and its origin in the Xikuangshan district, central Hunan".Acta Petrologica Sinica 32.7(2016):2041-2056.
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