Genesis of the Samba Cu deposit of the Central African Copperbelt in Zambia: Constraints from geochemistry and geochronology

IF 3.9 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geological Society of America Bulletin Pub Date : 2023-10-11 DOI:10.1130/b37146.1

Yong Zhang, Shouyu Zhou, Xiaolei Wu, Qiaofan Hu

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Abstract

The Samba Cu deposit is located in pre-Katangan Supergroup basement metavolcanic rocks of the Central African Copperbelt in Zambia. To better understand the formation of the Cu deposit, we use geochronologic, geochemical, and S isotopic data obtained for the deposit’s host rocks and sulfide minerals. Laser ablation−inductively coupled plasma−mass spectrometric (LA-ICP-MS) dating of zircon from host rocks, including quartz-sericite schist and biotite-sericite-chlorite schist, yields ages of 1967 ± 17 Ma and 1960 ± 20 Ma, which are interpreted as the crystallization ages of the original volcanic rocks. Re-Os analyses of molybdenite intergrown with chalcopyrite constrain sulfide deposition to 548.1 ± 7.5 Ma and 524.1 ± 7.3 Ma, which correspond to the timing of the Cu mineralization. LA-ICP-MS U-Pb analyses of metamorphic rutile from the biotite-sericite-chlorite schist yield a U-Pb age of 508.3 ± 6.6 Ma, which is interpreted to represent the age of regional metamorphism. The new data suggest that the Cu mineralization at Samba was synchronous with the Lufilian orogeny.

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赞比亚中非铜带桑巴铜矿的成因:地球化学和地质年代学的制约

Samba铜矿床位于赞比亚中非铜带的前加丹甘超群基底变质火山岩中。为了更好地了解铜矿床的形成，我们使用了矿床主岩和硫化物矿物的地质年代学、地球化学和S同位素数据。激光烧蚀-电感耦合等离子体-质谱法(LA-ICP-MS)测定了石英-绢云母片岩和黑云母-绢云母-绿泥石片岩中锆石的年龄，分别为1967±17 Ma和1960±20 Ma，可作为原始火山岩的结晶年龄。辉钼矿与黄铜矿共生的Re-Os分析表明，硫化物沉积时间为548.1±7.5 Ma和524.1±7.3 Ma，与铜成矿时间一致。对黑云母-绢云母-绿泥石片岩中变质金红石进行LA-ICP-MS U-Pb分析，U-Pb年龄为508.3±6.6 Ma，可解释为区域变质年龄。新资料表明，桑巴铜成矿与鲁菲连造山运动同步。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geological Society of America Bulletin 地学-地球科学综合

CiteScore

9.30

自引率

8.20%

发文量

159

审稿时长

4-8 weeks

期刊介绍： The GSA Bulletin is the Society''s premier scholarly journal, published continuously since 1890. Its first editor was William John (WJ) McGee, who was responsible for establishing much of its original style and format. Fully refereed, each bimonthly issue includes 16-20 papers focusing on the most definitive, timely, and classic-style research in all earth-science disciplines. The Bulletin welcomes most contributions that are data-rich, mature studies of broad interest (i.e., of interest to more than one sub-discipline of earth science) and of lasting, archival quality. These include (but are not limited to) studies related to tectonics, structural geology, geochemistry, geophysics, hydrogeology, marine geology, paleoclimatology, planetary geology, quaternary geology/geomorphology, sedimentary geology, stratigraphy, and volcanology. The journal is committed to further developing both the scope of its content and its international profile so that it publishes the most current earth science research that will be of wide interest to geoscientists.