Petrology and geochemistry of the Cu-bearing carbonatite from the Shivuma copper deposit, Zambia: Implications to petrogenesis and metallogeny

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 离退休科研人员

	Petrology and geochemistry of the Cu-bearing carbonatite from the Shivuma copper deposit, Zambia: Implications to petrogenesis and metallogeny
	Bian QianTao 1; Gai ShouShan 2; Liu ShaoYou 2; Zhang XueShu 2; Fu ChaoYi 2; Guo JiangTao 2; Li ChuanBan 2; Zhan ChangFan 2
刊名	ACTA PETROLOGICA SINICA
	2017
卷号	33 期号:6 页码:1805-1826
关键词	Carbonatite Copper deposit Petrology Geochemistry IOCG Zambia Shivuma
ISSN号	1000-0569
文献子类	Article
英文摘要	An Iron Oxide-Copper-Gold (IOCG) carbonatite-type copper deposit was recently discovered near a village named Shivuma of Kasempa City of Northwest Province, Zambia. The deposit occurs at the intersection of a NW-striking deep fault and a NEE- to EW-striking fault, which are on the southern edge of the middle section of the synclinorium belt of the Lufilian Arc of the Pan-African orogen. The major strata are volcaniclastic rocks of the Kundelungu Group, which are on upper part of the Neo-Proterozoic Katanga Supergroup in the Cu deposit district, and igneous rocks are abundant, such as gabbro, diabase, gabbroic diorite, diorite, pyroxenite, lamprophyre, quartz-albitite and andesite. The major Cu-bearing rock is carbonatite, which varies in thickness from less than one centimeter to tens of meters and mainly intruded in the volcaniclastics. It has been observed that the carbonatite shows vesicular and flow structures, penetrates into and branches out in the country rock and contains xenoliths of volcaniclastics and andesite. The Cu-bearing carbonatite is greyish white, non-bedded, and dominantly of subhedral and fine-grained textures but mosaic and inclusion textures are also common. Calcite and dolomite are often twined. The mineralogy of the Cu-bearing carbonatite is complex with more than 40 minerals, with the major non-metal minerals being calcite followed by anhydrite, dolomite and fluorite, the major metal minerals being magnetite, chalcopyrite and pyrite, and subordinately pyrrhotite, sphalerite, molybdenite and bornite, and other silicates and rare earth minerals being also seen. The Cu-bearing carbonatite is wholly and unevenly mineralized with major ore structure being disseminated and taxitic, and subordinately massive and densely disseminated, and common ore textures being euhedral- to subhedral-fine-grained, anhedral-fine-grained, replacement-resorption, exsolution, sideronitic, mosaic, inclusion and border-sharing. The Shivuma copper deposit is featured with IOCG deposits and can thus be called IOCG carbonatite-type Cu deposit. The Cu-bearing carbonatite is characterized by higher contents of CaO (28.48% similar to 41.72%), FeO (3.91% similar to 20.95%) and Fez 03 (3.84% similar to 31.56%), and lower contents of Mg0 (0.68% similar to 2.51%) with CaO/MgO ratios ranging 10.5 similar to 60.0 and can thus be classified as ferrous calcite carbonatite. The REE concentrations of the Cu-bearing carbonatite are high with Sigma REE = 57.75 x 10(-6) 1076 x 10(-6) and LREE being richer than HREE with LREE/HREE ratios ranging 6.3 similar to 83.8 that results in the normalized distribution patterns tilting to the HREE end. High positive Eu anomalies (delta Eu = 2.92 similar to 11.1) and low negative Ce anomalies (delta Ce = 0. 68 similar to 0.83) are present. Metal sulfides and magnetite show similar REE patterns as the Cu-bearing carbonatite, an indication that they may have derived from the same source. The Cu-bearing carbonatite is enriched in Ba, Sr, Pb, U, Nb, P and REE but depleted in Ta, Zr, Hf and Ti, with Sr concentration varying from 147 x 10(-6) to 6360 x 10(-6) and an average of 3209 x 10(-6), and that of Ba varying from 13.2 x 10(-6) to 10600 x 10(-6) and an average of 3640 x 10(-6). The trace element geochemistry of the metal minerals is similar to that of the Cu-bearing carbonatite. Zr/Hf and Y/Ho rations and Y contents of the Cu-bearing carbonatite suggest that the rock belongs to a highly evolved magmatic system, transitional between pure melts and hydrothermal fluids.
WOS关键词	OLDOINYO-LENGAI ; LIQUID IMMISCIBILITY ; DEPLETED MANTLE ; GOLD DEPOSITS ; SUNG VALLEY ; SR ; ND ; PB ; PROVINCE ; ISOTOPE
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000406212700012
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/62009]
专题	地质与地球物理研究所_离退休科研人员
通讯作者	Bian QianTao
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Sinomine Resource Explorat Co Ltd, Beijing 100089, Peoples R China
推荐引用方式 GB/T 7714	Bian QianTao,Gai ShouShan,Liu ShaoYou,et al. Petrology and geochemistry of the Cu-bearing carbonatite from the Shivuma copper deposit, Zambia: Implications to petrogenesis and metallogeny[J]. ACTA PETROLOGICA SINICA,2017,33(6):1805-1826.
APA	Bian QianTao.,Gai ShouShan.,Liu ShaoYou.,Zhang XueShu.,Fu ChaoYi.,...&Zhan ChangFan.(2017).Petrology and geochemistry of the Cu-bearing carbonatite from the Shivuma copper deposit, Zambia: Implications to petrogenesis and metallogeny.ACTA PETROLOGICA SINICA,33(6),1805-1826.
MLA	Bian QianTao,et al."Petrology and geochemistry of the Cu-bearing carbonatite from the Shivuma copper deposit, Zambia: Implications to petrogenesis and metallogeny".ACTA PETROLOGICA SINICA 33.6(2017):1805-1826.