REE geochemistry of auriferous quartz carbonate veins of Neoarchean Ajjanahalli gold deposit,Chitradurga schist belt,Dharwar Craton,India  

作　　者：S.Sarangi R.Srinivasan V.Balaram 

机构地区：[1]Department,of Applied Geology,ISM-Dhanbad.India [2]114,Kshithija,Ramanashree Nagar,Bannerghatta Road P.O.,Bangalore 560076,India [3]National Geophysical Research Institute(Council of Scientific and Industrial Research),Hyderabad 500 007.India

出　　处：《Geoscience Frontiers》2013年第2期231-239,共9页地学前缘（英文版）

基　　金：funding through Minor Research Project from Indian School of Mines,Dhanbad and SERC,Department of Science & Technology,New Delhi,India

摘　　要：REE composition of the carbonates of the auriferous quartz carbonate veins（QCVs） of the Neoarchean Ajjanahalli gold deposit.Chitradurga schist belt.Dharwar Craton,is characterized by U-shaped chondrite normalized REE patterns with both LREE and HREE enrichment and a distinct positive Eu anomaly.As positive Eu anomaly is associated with low oxygen fugacity,we propose that the auriferous fluids responsible for gold mineralization at Ajjanahalli could be from an oxygen depleted fluid.The observed positive Eu anomaly is interpreted to suggest the derivation of the auriferous fluids from a mantle reservoir.The location of Ajjanahalli gold deposit in a crustal scale shear zone is consistent with this interpretation.REE composition of the carbonates of the auriferous quartz carbonate veins（QCVs） of the Neoarchean Ajjanahalli gold deposit.Chitradurga schist belt.Dharwar Craton,is characterized by U-shaped chondrite normalized REE patterns with both LREE and HREE enrichment and a distinct positive Eu anomaly.As positive Eu anomaly is associated with low oxygen fugacity,we propose that the auriferous fluids responsible for gold mineralization at Ajjanahalli could be from an oxygen depleted fluid.The observed positive Eu anomaly is interpreted to suggest the derivation of the auriferous fluids from a mantle reservoir.The location of Ajjanahalli gold deposit in a crustal scale shear zone is consistent with this interpretation.

关 键 词：U-shaped REE pattern Eu anomaly Quartz carbonate veins（QCVs） Orogenic gold deposits Dharwar Craton 

分 类 号：P595[天文地球—地球化学]