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zircon u-pb-hf isotopes and mineral chemistry of Early Cretaceous granodiorite in the Lunggar iron deposit in central Lhasa, Tibet Y, China

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Journal of Central South university 2019年第12期26卷 3457-3469页

作者： ZHANG Yun-hui WANG Yang-shuang WANG Wen-shu LIu Jie YuAN Ling-ling Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationSchool of Geoscience and Info-physicsCentral South UniversityChangsha 410083China Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection College of Environment and Civil EngineeringChengdu University of TechnologyChengdu 610059China

The Lunggar iron deposit belongs to the Bangong-Nujiang metallogenic belt and is located in central Lhasa on the Tibetan *** the Lunggar deposit,iron mineralization formed in the skarnization contact zone between the Early Cretaceous granodiorite and the late Permian Xiala Formation *** this study,we achieved detailed zircon u-pb-hf isotopes and mineral chemistry for the Early Cretaceous *** u-pb dating results indicate that the Early Cretaceous granodiorite emplaced at ca.119 *** on the trace elements in zircons and the mineral chemical composition of amphibole and biotite,the Early Cretaceous granodiorite was believed to form under condition of high temperature(>700°C),low pressure(100400 MPa),and relatively high oxygen fugacity(lgfO2)(13.6 to 13.9)and H2O content(4%8%).zircon trace elements,hf isotope and biotite chemistry collectively reveal that significant juvenile mantle-derived magmas contributed to the source of the *** relatively high logfO2 and shallow magma chamber are beneficial for skarn iron mineralization,implying remarkable potential for further prospecting in the Lunggar iron deposit.

关键词： zircon u-pb-hf isotope mineral chemistry crystallization condition Lunggar iron deposit central Lhasa

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

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Acta Geologica Sinica(English Edition) 2014年第3期88卷 780-800页

作者： CHEN Rui LIu Yulin GuO Lishuang WANG Zhenghua LIu Hongfei Xu Kaifeng ZHANG Jinshu Key Laboratory of Orogenic Belt and Crustal Evolution MOE Peking University Key Laboratory of Crustal Dynamics Institute of Crustal Dynamics CEA Wanbao Mining Limited Tibet Institute of Geological Survey

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.

关键词： Tinggong Adamellite porphyry Diorite porphyry zircon u-pb-hf isotope Geochemistry

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