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Origin of high-Cr podiform chromitites from Kabaena Island, Southeast Sulawesi, Indonesia: constraints from mineralogy and geochemistry

文献类型：期刊论文

作者Yao, Junhua2,3,4; Xu, Jinhong4,5,6; Wu, Chengquan4,6; Zhang, Zhengwei4; Rosana, Mega Fatimah1; Li, Xiyao4; Jin, Ziru4
刊名INTERNATIONAL GEOLOGY REVIEW
出版日期2023-01-16
页码18
ISSN号0020-6814
关键词Chromite Silicate inclusions PGM High-Cr chromitites Sulawesi
DOI10.1080/00206814.2023.2167130
通讯作者Xu, Jinhong(xujinhong2011@126.com) ; Wu, Chengquan(wuchenquan@vip.gyig.ac.cn)
英文摘要The East Sulawesi Ophiolite, one of the three largest ophiolites in the world, contains important podiform chromitites. However, the origin of these chromite deposits is not well constrained. Here, we present the detailed mineralogy and in situ chemistry of chromite and solid inclusions within chromite for podiform chromitites from the Kabaena Island, Southeast Sulawesi. Chromite grains have low TiO2 (0.17-0.27 wt%) and Al2O3 (13.4-15.1 wt%) contents and high Cr# [Cr/(Cr+Al), molar] of 0.70-0.74 and Mg# [Mg/(Mg+Fe2+), molar] of 0.69-0.75, which resemble those of other high-Cr podiform chromitites worldwide. The MORB-normalized patterns for some selected major-trace elements of chromite show slightly positive slopes from Al2O3 to Mn. Chromite-hosted silicate inclusions include olivine, clinopyroxene, orthopyroxene and amphibole and are characterized by higher Mg/Fe ratios than those of host peridotites. The geothermobarometry of chromite-hosted clinopyroxene-orthopyroxene pairs indicates that the estimated T-P conditions of the parental magma of the Kabaena chromitites are 950-1010 degrees C and 7.0-8.4 Kbar. The extreme-Mg-rich olivine inclusions (Fo >96) with extremely high Ni (5300-8200 ppm) and Cr (1500-6700 ppm) contents are interpreted to have crystallized from high-Mg and Cr boninitic melts, and the Fo contents were then elevated by subsolidus re-equilibration (Fe-Mg and Fe-Ni exchange) with chromite. Sulfide inclusions contain base metal minerals containing millerite with rare pentlandite and chalcopyrite, and platinum-group minerals that include the laurite-erlichmanite series, Ir-Ni monosulfide, irarsite and cuproiridsite. This sulfide assemblage reveals that their parental magmas experienced the evolution of high T and low f(S-2) to low T and high f(S-2) from the early to late stage. Finally, combined with the palaeogeographic reconstruction in Sulawesi, we propose that the high-Cr chromitites in this region were formed by the reaction of depleted mantle and boninitic magma beneath a juvenile island arc, implying the initiation of a new subduction in the Miocene.
WOS关键词PLATINUM-GROUP ELEMENTS ; TURKEY IMPLICATIONS ; OMAN OPHIOLITE ; LUOBUSA OPHIOLITE ; SOLID INCLUSIONS ; MELT INCLUSIONS ; TRACE-ELEMENTS ; OLIVINE ; SPINEL ; ZONE
WOS研究方向Geology
语种英语
出版者TAYLOR & FRANCIS INC
WOS记录号WOS:000913153800001
源URL[http://ir.qdio.ac.cn/handle/337002/183311]  
专题海洋研究所_海洋地质与环境重点实验室
通讯作者Xu, Jinhong; Wu, Chengquan
作者单位1.Univ Padjadjaran, Fac Geol, Sumedang, Indonesia
2.Chinese Acad Sci, Ctr Deep Sea Res, Qingdao, Peoples R China
3.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China
4.Tongren Univ, Sch Econ & Management, Tongren, Guizhou, Peoples R China
5.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang, Peoples R China
6.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China
推荐引用方式
GB/T 7714		 Yao, Junhua,Xu, Jinhong,Wu, Chengquan,et al. Origin of high-Cr podiform chromitites from Kabaena Island, Southeast Sulawesi, Indonesia: constraints from mineralogy and geochemistry[J]. INTERNATIONAL GEOLOGY REVIEW,2023:18.
APA Yao, Junhua.,Xu, Jinhong.,Wu, Chengquan.,Zhang, Zhengwei.,Rosana, Mega Fatimah.,...&Jin, Ziru.(2023).Origin of high-Cr podiform chromitites from Kabaena Island, Southeast Sulawesi, Indonesia: constraints from mineralogy and geochemistry.INTERNATIONAL GEOLOGY REVIEW,18.
MLA Yao, Junhua,et al."Origin of high-Cr podiform chromitites from Kabaena Island, Southeast Sulawesi, Indonesia: constraints from mineralogy and geochemistry".INTERNATIONAL GEOLOGY REVIEW (2023):18.

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来源：海洋研究所

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