Elements Mobilization of Mineralized Porphyry Rocks during Hydrothermal Alteration at Zhushahong Porphyry Copper Deposit, Dexing District, South China

详细信息   

• 责任者：Wang Cuiyun (State Key Laboratory for Geochemistry Research ; Institute of Geochemistry ; Chinese Academy of Sciences ; Guiyang 550002 ; China) ; Li Xiaofeng
• 刊名：Acta Petrologica Sinica
• 出版年：2012
• 卷期：28(12)
• 关键词：斑岩铜矿床 ; porphyry copper deposit ; 元素地球化学 ; elements geochemistry ; 江西 ; Jiangxi Province
• 页码：p.3869-3886
• 图表：8 illus., 3 tables, 65 refs.
• 分类号：1001
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

摘要

///Dexing copper ore field, one of the most typical porphyry deposits in South China, is composed of Zhushahong, Tongchang, Fujiawu ore deposits. Based on petrographic investigation of drill core samples, the mineralized granodiorite porphyries at Zhushahong deposit are divided into three altered rock types. The chondrite-normalized REE distribution patterns of all samples show typical flat to listric-shaped patterns and reflect crystallization of amphibole. In terms of net element gain and loss, chlorite alteration rocks have undergone net REE loss, while the muscovite-quartz alteration porphyries shows great difference, the behavior of LREE/HREE is contingent on the samples. The Y/Ho ratios are similar to those of CI chondrite, which indicates that Y and Ho show a similar geochemical behavior during hydrothermal alteration. The granodiorite porphyry rocks have high Sr/Y and La/Sm ratios and medium Sm/Yb ratios, indicating a magma source with the residual phases of amphibole and/or garnet.