Combined mica and apatite chemical compositions to trace magmatic-hydrothermal evolution of fertile granites in the Dachang Sn-polymetallic district, South China

doi:10.1016/j.oregeorev.2022.105168

CORC > 海洋研究所 > 中国科学院海洋研究所 > 深海极端环境与生命过程研究中心

	Combined mica and apatite chemical compositions to trace magmatic-hydrothermal evolution of fertile granites in the Dachang Sn-polymetallic district, South China
	Guo, Jia 5; Zhang, Gangyang 5; Xiang, Lu 5; Zhang, Rongqing 3,4; Zhang, Lipeng 2; Sun, Weidong 1,2
刊名	ORE GEOLOGY REVIEWS
	2022-12-01
卷号	151 页码:15
关键词	Mica Apatite Highly evolved biotite granite Magmatic-hydrothermal processes Dachang district South China
ISSN号	0169-1368
DOI	10.1016/j.oregeorev.2022.105168
通讯作者	Zhang, Gangyang(zhanggangyang@163.com)
英文摘要	Tin mineralization in the Dachang Sn-polymetallic district, South China, is inferred to be associated with the Late Cretaceous Longxianggai pluton, which is primarily composed of porphyritic and equigranular (from medium-grained, to medium-to fine-grained, and then fine-grained textures) biotite granites. However, the magmatic and post-magmatic evolution that may exert an essential role in determining metal fertility of granitic intrusions remains poorly constrained. A comprehensive investigation on chemical compositions of mica (magmatic biotite and hydrothermal muscovite) and apatite in the Longxianggai biotite granites is employed to trace magmatic-hydrothermal processes and their potential role in the formation of fertile granites and hydrothermal Sn mineralization.Magmatic biotite shows variable compositions from Fe-biotite to protolithionite in the porphyritic and equi-granular granites. Increasing AlVI and Mn, and decreasing Mg and Ti with increasing XFe in biotite from the porphyritic to medium-grained, and then medium-to fine-grained granites are consistent with compositional variation trends expected during magmatic differentiation, accompanying with progressive enrichment of Li, F, Rb, Cs, Nb, Ta, W and Sn. However, an obvious depletion of Sn, Nb and Cl occurs in magmatic biotite from the more evolved fine-grained granite, with hydrothermal muscovite containing higher Sn and lower Nb contents. Tin depletion in biotite possibly reflects preferential portioning of Sn in Cl-bearing fluids exsolved from the differentiated granitic magmas prior to biotite crystallization. Likewise, the decoupling of Nb with Ta in biotite may attribute to extraction of Nb by exsolved fluids to form secondary Nb-rich rutile and CGMs (columbite-group minerals) in the granite matrix. The relatively high mobility/solubility of Nb in fluids compared to Ta is also consistent with elevated Nb/Ta ratios in hydrothermal muscovite. Compared with apatite in the porphyritic granite, apatite in the medium-to fine-grained granite generally develops fluid inclusions and micro-fractures/ pores (often filled with quartz, zircon and monazite), and possesses tetrad REE patterns with variable Eu anomalies, in favor of its crystallization in fluid-saturated fractionated melts. The mineralogical data indicate that equigranular granites have experienced a higher degree of magmatic fractionation than porphyritic granites, with fluid exsolution occurring in late stage of granite solidification. The prolonged fractional crystallization followed by late fluid exsolution may play an important role in hydrothermal mineralization in the Dachang district. A compilation of mica and apatite elemental compositions from Dachang and other Sn-W-related granites demonstrates that high Sn contents and high Fe/(Fe + Mg + Mn) ratios in magmatic biotite, and elevated F, Fe, Mn and Sn contents in apatite, could be geochemical indicators for granitic rocks with high Sn-W mineralization potential.
资助项目	National Natural Science Foundation of China[42102108] ; Fundamental Research Funds for the Central Universities[DLTD2104] ; Key Research and Development Program of Sichuan Province in China[22ZDYF220] ; Everest Scientific Research Program[2020ZF11413]
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000892909600001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/180973]
专题	海洋研究所_深海极端环境与生命过程研究中心
通讯作者	Zhang, Gangyang
作者单位	1.Deep Sea Multidisciplinary Res Ctr, Pilot Natl Lab Marine Sci & Technol Qingdao, Qingdao 266237, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 3.Nanjing Univ, Frontiers Sci Ctr Crit Earth Mat Cycling, Nanjing 210023, Peoples R China 4.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210023, Peoples R China 5.Chengdu Univ Technol, Coll Earth Sci, Chengdu 610059, Peoples R China
推荐引用方式 GB/T 7714	Guo, Jia,Zhang, Gangyang,Xiang, Lu,et al. Combined mica and apatite chemical compositions to trace magmatic-hydrothermal evolution of fertile granites in the Dachang Sn-polymetallic district, South China[J]. ORE GEOLOGY REVIEWS,2022,151:15.
APA	Guo, Jia,Zhang, Gangyang,Xiang, Lu,Zhang, Rongqing,Zhang, Lipeng,&Sun, Weidong.(2022).Combined mica and apatite chemical compositions to trace magmatic-hydrothermal evolution of fertile granites in the Dachang Sn-polymetallic district, South China.ORE GEOLOGY REVIEWS,151,15.
MLA	Guo, Jia,et al."Combined mica and apatite chemical compositions to trace magmatic-hydrothermal evolution of fertile granites in the Dachang Sn-polymetallic district, South China".ORE GEOLOGY REVIEWS 151(2022):15.