山东国土资源2017，Vol.33Issue(2)：16-20,5.
西藏甲玛铜多金属矿床中新世埃达克岩特征
Characteristics of Miocene Adakite in Jiama Copper-polymetallic Deposit in Tibet
摘要
Abstract
Adakite has close relation with the enrichment of metallic element,such as Gu and Au,and also has an important indicating significance of deep orogenesis.Because of the collisional orogeny,an enormous potential porphyry copper ore belt was formed in Tibet.Jiama copper polymetallic deposit is just located in the eastern section of the copper ore belt.The geochemistry test has been carried out on the intermediate acid intrusive rock of Jiama deposit.It is showed that the content of SiO2≥56%,Al2O3≥15%,MgO<3%,Na2O>2.3%,K2O>2.1%,and K2O/Na2O is between 0.6~1.2.As showed by rare earth element and trace element results,it is high in Sr content(>400×106),low in Yb content(<1.9×106) and Y content(<15×106),LREE is enriched while HREE is deficiency,and without Eu anomaly.It has the same geochemistry characteristics with adakite,and belongs to C type adakite.It is considered that the intermediate acid intrusive rock was formed by the melting of extra heavy lower crust and upper mantle materials.关键词
甲玛矿床/中新世/埃达克岩/西藏Key words
Jiama deposit/Miocene/adakite/Tibet分类
天文与地球科学引用本文复制引用
李波,胡道功,罗斐,张翼飞,张海林,韩昱..西藏甲玛铜多金属矿床中新世埃达克岩特征[J].山东国土资源,2017,33(2):16-20,5.基金项目
中国地质调查局项目(编号:1212011120185) （编号:1212011120185）
