Source of metals related to gold occurrences in Cameroon, Central African Belt  

作　　者：Kevin Igor Azeuda Ndonfack Jinlin Zhang Yuling Xie NSamiratou Yaya Emmanuel Archelaus Afanga Basua 

机构地区：[1]JCHX Mining Management Co.,Ltd,Beijing 101500,People’s Republic of China [2]Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,People’s Republic of China [3]School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,People’s Republic of China [4]Department of Earth Science,University of Bamenda,Bamenda,Republic of Cameroon

出　　处：《Acta Geochimica》2024年第2期308-324,共17页地球化学学报（英文）

基　　金：funded by the Ministry of Science and Technology of the People’s Republic of China(State Key Research Plan,No.2017YFC0601302).

摘　　要：Suites of granitic and metamorphic rocks form a perfect geological environment in which to investigate the source of metals related to gold deposits.In the East Province of Cameroon,the source of metals-related gold(grade~4.6 g/t)that occurs within metamorphic and granitic rocks remains ambiguous.The host rocks were subjected to XRF and ICP-MS whole-rock geochemistry and BSE/EDS mineral analyses to investigate the source(s)of metals related to gold in the Province.Petrographically,chalcopyrite-pyrite and magnetite-ilmenite are the main sulfi des and oxides of granites,respectively.The low-grade metamorphic rocks are sulfi de-rich consisting of arsenopyrite,chalcopyrite,pyrite,and sphalerite,and oxides include magnetite,ilmenite,hematite,and rutile.Cu,Ni,Co,Sb,Sc,and Zn concentrations depleted in high-grade metamorphic rocks and granites compared to low-grade metamorphic rocks.As well,Bi,Cd,Co,Cu,Ni,Sb,V,W,and Zn concentrations decrease with increasing temperatures from low-grade rocks to high-grade rocks and granites.The suite of depleted elements in high-grade rocks and granites is almost identical to those enriched in gold occurrences.We conclude that metals(Bi,Cd,Co,Cu,Ni,Sb,and Zn)related to gold mineralization in the East Province of Cameroon likely originated from metal-rich low-grade metamorphic rocks during prograde metamorphic processes prior to partial melting.

关 键 词：East Province of Cameroon Metamorphic rocks GRANITES Oxide–sulfides Metal and gold GEOCHEMISTRY 

分 类 号：P618.51[天文地球—矿床学]