Geochemistry and Origin of Late Cretaceous (~90Ma) Ore-Bearing Porphyry of Balazha in Mid-Northern Lhasa Terrane , Tibet
详细信息
- 责任者：Yu Hongxia (State Key Laboratory of Isotope Geochemistry ; Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Chen Jianlin
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(7)
- 关键词：斑岩 ; porphyry ; 含矿带 ; ore-bearing zones ; 岩石地球化学 ; lithogeochemistry ; 西藏 ; Tibet
- 页码：p.2011-2022
- 图表：9 illus., 2 tables, 76 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The ore-bearing porphyry of Balazha in mid-northern Lhasa terrane shows some typical geochemical characteristics of an adakite. The geochemical features, combined with other characteristics of Late Cretaceous lavas in mid-northern Lhasa terrane, indicate that they did not result from melting of young oceanic crust, assimilation and fractional crystallization, or from either underplated or thickened continental crust. Instead, they were possibly derived from partial melting of delaminated lower continental crust. On the other hand, they are also likely to the result of partial melting of crust-mantle material, triggered by slab break-off of south-dipping subduction of Slainajap ocean or Bangong Co-Nujiang ocean.