Geochronology and Geochemistry of the Tinggong Porphyry Copper Ore Deposit, Tibet

作     者：CHEN Rui LIU Yulin GUO Lishuang WANG Zhenghua LIU Hongfei XU Kaifeng ZHANG Jinshu 

作者机构：Key Laboratory of Orogenic Belt and Crustal Evolution MOE Peking University Key Laboratory of Crustal DynamicsInstitute of Crustal Dynamics CEA Wanbao Mining Limited Tibet Institute of Geological Survey 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2014年第88卷第3期

页      面：780-800页

核心收录：

学科分类：070902[理学-地球化学] 081803[工学-地质工程] 0709[理学-地质学] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the "Researches of tectonics  magmatism evolution  and metallogeny in the Gangdese belt  Tibet" Program of China Geological Survey (1212010818098) 

主　　题：Tinggong Adamellite porphyry Diorite porphyry Zircon U-Pb-Hf isotope Geochemistry 

摘      要：We have determined the ages of the ore-bearing Tinggong porphyries and the Eocene granites using the LA-ICPMS zircon U-Pb *** from one adamellite porphyry and two diorite porphyries yield ages of 15.54±0.28 Ma,15.02±0.25 Ma and 14.74±0.22 Ma,*** ages of two granites are 50.48±0.71 Ma and 50.16±0.48 *** Rare Earth Elements （LREE） are enriched in the ore-bearing adamellite porphyries,which are high-K caic-alkaline and metaluminous,while Heavy Rare Earth Elements （HREE） and Y are strongly depleted,indicating an adakitic *** Large Ion Lithophile Elements （LILE） of the adamellite porphyries are highly enriched,whereas some High Field Strength Elements （HFSE） are *** diorite porphyry in this study is chemically similar to the adamellite porphyries,except that the Mg# of the diorite porphyry is a little higher,demonstrating more mantle *** samples from different rocks are selected for in situ zircon Hf isotopic *** samples show positive εHf（t） values and young Hf model ages,indicating their derivation from juvenile ***,the adamellite porphyry and diorite porphyry formed in the Miocene exhibit more heterogeneous Hf isotopic ratios,with lower （Σ）Hf （t） values than the granites formed in the Eocene,suggesting the involvement of old Indian continent crust in their *** geochronology and geochemistry of the adamellite porphyries and the diorite porphyries indicate that they formed from the same source region in a post-collisional environment,but contaminated by crust and mantle materials in different *** metallic minerals formed mainly during the older adamellite porphyry stage,but they were recycled and reactivated by the diorite porphyry intrusion.