Chunli GUO, Simon A. WILDE, Coralie SIEGEL, Zhenyu CHEN, Shichong WU
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引用次数: 0
摘要
有两个因素,即矿源成分和岩浆分异,可能控制着钨锰矿化。至于哪一个因素更重要,目前还存在广泛争议,可能需要根据每个矿床的具体情况来确定。位于华南的西田花岗岩熔岩是研究上述问题的天然实验室。它基本上由两个独立的部分组成,分别形成于大约 226 Ma 的三叠纪和大约 152 Ma 的侏罗纪。分别形成于约 226 Ma 的三叠纪和约 152 Ma 的侏罗纪。三叠纪和侏罗纪岩石均由斑岩和细粒相组成。后者由高度分化的斑岩形成,但它们具有相似的纹理特征和矿物组合,表明它们达到了相似的晶体分馏程度。虽然这两种细粒相都是高分化的,稀有金属含量较高,但在三叠纪花岗岩中经济的W-Sn成矿作用却很少见,这可以归因于与侏罗纪花岗岩相比,三叠纪花岗岩的矿源材料肥沃程度较低,同位素特征略微富集,全岩εNd(226 Ma)为-10.4至-9.2 (2σ = 0.2),而侏罗纪岩石的εNd(152 Ma) 为-9.2至-8.2 (2σ = 0.2)。最初的W-Sn富集来自变质岩,大陆地壳的再加工强烈地增强了W-Sn的富集,在侏罗纪达到顶峰。
Source Enrichment Control on the Scale of Magmatic-Hydrothermal W-Sn Mineralization: Insights from Triassic and Jurassic Magma Reservoirs in the Continental Crust, Xitian, South China
There are two factors, source composition and magmatic differentiation, potentially controlling W-Sn mineralization. Which one is more important is widely debated and may need to be determined for each individual deposit. The Xitian granite batholith located in South China is a natural laboratory for investigating the above problem. It consists essentially of two separate components, formed in the Triassic at ca. 226 Ma and Jurassic at ca. 152 Ma, respectively. The Triassic and Jurassic rocks are both composed of porphyritic and fine-grained phases. The latter resulted from highly-differentiated porphyritic ones but they have similar textural characteristics and mineral assemblages, indicating that they reached a similar degree of crystal fractionation. Although both fine-grained phases are highly differentiated with elevated rare metal contents, economic W–Sn mineralization is rare in the Triassic granitoids and this can be attributed to less fertile source materials than their Jurassic counterparts, with a slightly more enriched isotopic signature and whole-rock εNd(226Ma) of –10.4 to –9.2 (2σ = 0.2) compared with εNd(152Ma) of –9.2 to -8.2 (2σ = 0.2) for the Jurassic rocks. The initial W-Sn enrichment was derived from the metasedimentary rocks and strongly enhanced by reworking of the continental crust, culminating in the Jurassic.
期刊介绍:
Acta Geologica Sinica mainly reports the latest and most important achievements in the theoretical and basic research in geological sciences, together with new technologies, in China. Papers published involve various aspects of research concerning geosciences and related disciplines, such as stratigraphy, palaeontology, origin and history of the Earth, structural geology, tectonics, mineralogy, petrology, geochemistry, geophysics, geology of mineral deposits, hydrogeology, engineering geology, environmental geology, regional geology and new theories and technologies of geological exploration.