- 责任者：Zhang Lixue (State Key Laboratory of Geological Processes and Mineral Resources ; School of Earth Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Wang Qing
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(11)
- 关键词：地壳 ; crust ; 成矿作用 ; metallogenesis ; 铪同位素 ; hafnium isotopes ; 西藏 ; Tibet
- 页码：p.3681-3688
- 图表：3 illus., 54 refs.
- 分类号：1001
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
The spatial distribution of the nature of the crust beneath the Lhasa Terrane （ especially the northern Lhasa subterrane） remains poorly known so far, directly limiting the further summary and assessment on the metallogenic regularity and metallogenic potential of the Lhasa Terrane. This paper collects a large amount of zircon U-Pb age and Hf isotope data （ including published data in the literature and our abundant unpublished data） of silicic magmatic rock aged from Mesozoic to early Cenozoic （210 ~40Ma） to map the Lhasa Terrane using Surfer 10 software in terms of zircon Hf isotopes and crustal model ages. The results of this paper further confirm that （1） the central Lhasa subterrane was once a microcontinent, （2） the southern and northern Lhasa subterranes are dominated by the presence of juvenile crust, and （3） the zircon enf（t） and crustal model ages of silicie rocks from Rutog-Yanhu in the northern Lhasa subterrane are comparable to those of silieic rocks from Xigaze-Bayi in the southern Lhasa subterrane, both of which display high and positive zircon enf（t） （thus are undoubtedly of juvenile crust）. Abundant data summarized in this paper, together with the results previously obtained, indicate that the nature of the crust （juvenile or ancient） is most likely to be the critical factor to control types of mineralization. Considering the similarities of the nature of the crust and the types of mineralization between the northern and the southern Lhasa subterranes, in combination with the data currently available for the deposits in the northern Lhasa subterrane, this paper proposes that the Rutog-Yanhu area in the northern Lhasa subterrane has the greatest potential for the Cu-Au mineralization.