Zircon Trace Element Characteristics of Intrusions in Bangpu Porphyry Mo(Cu) Polymetallic Deposit of Tibet and Their Geological Significance(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2015年第06期
- Page:
- 59-71
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Zircon Trace Element Characteristics of Intrusions in Bangpu Porphyry Mo(Cu) Polymetallic Deposit of Tibet and Their Geological Significance
- Author(s):
- LI Zhuang; WANG Li-qiang; ZHANG Zhong; LUO Mao-cheng; LENG Qiu-feng; KANG Hao-ran; MENG Zhan
- 1. School of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China;2. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;3. Tibet Tianyuan Mineral Exploration Co. Ltd., Shigatse 857000, Tibet, China;4. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
- Keywords:
- polymetallic deposit; intrusive rock; trace element; genetic type; Ti-in-zircon geothermometer; crystallization environment; Tibet
- PACS:
- P595
- DOI:
- -
- Abstract:
- The Bangpu porphyry Mo(Cu) polymetallic deposit is located in the eastern part of Gangdise metallogenic belt. The period and type of intrusive rocks in this area are various, mainly including biotite monzonitic granite during the early mineralization, diorite porphyrite and monzonitic granite during the mineralization, and quartz monzonitic porphyry and allgovite during the late mineralization. On basis of summarizing the previous research, the characteristics of zircon trace elements from diorite porphyrite in Bangpu deposit were studied by the LA-ICP-MS technology. The results show that the types of zircon from intrusive rocks mainly include magmatic and hydrothermal zircons; chondrite-normalized REE patterns of the above five types of intrusive rocks are similar, and the curves are left deviation and steep with the characteristics of positive Ce anomaly, negative Eu anomaly, LREE enrichment and HREE depletion. Crystallization temperatures of zircon from the above five intrusive rocks calculated by the Ti-in-zircon geothermometer show that the magma of intrusive rock during the mineralization and late mineralization are derived from the partial melting under the condition of nearly water saturation. According to the characteristics of special zircon trace element and REE, the zircons of the above five intrusive rocks are crystallized and differentiated from continental crust magma, and the host rocks corresponding to zircon form in the continental crust environment.
Last Update: 2015-11-27