|Table of Contents|

Geological Feature and Genesis of Niubiziliang Cu-Ni Sulphide Deposit in the Northern Margin of Qaidam Block(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2012年第04期
Page:
12-21
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Geological Feature and Genesis of Niubiziliang Cu-Ni Sulphide Deposit in the Northern Margin of Qaidam Block
Author(s):
ZHAO Yan-feng1; 2;  KANG Zhen1; 2;  LING Jin-lan1; 2;  ZHAO Shuang-xi3;  WANG Yong-gang3;  SHEN Da-li3;  JIANG Chang-yi1; 2
1. School of Earth Sciences and Resources, Chang’an University, Xi’an 710054, Shaanxi, China; 2. Key Laboratory of Western Mineral Resources and Geological Engineering of Ministryof Education, Xi’an 710054, Shaanxi, China; 3. Nuclear Industry Geological Bureau of Qinghai Province, Xining 810000, Qinghai, China
Keywords:
mafic-ultramafic intrusion;  magmatic evolution;  contamination;  sulphide deposit;  segregation mechanism;  genesis of deposit;  mineralization process;  Qaidam Block
PACS:
P588.1
DOI:
-
Abstract:
Niubiziliang Intrusion, which is located at Eboliang Fault-uplift in the northern margin of Qaidam Block, is a mafic-ultramafic bedded complex with an outcrop area of about 8 km2 in shape of sill with east-west extension; cumulate texture and cumulate layer developed, and the intrusion was divided into multiple cumulate rhythms and cycles; rock types were abundant and included peridotite phase, pyroxenite phase, gabbro phase, etc.; rock types of intermediate-acid end-member included quartz diorite and tonalite, so that magma underwent fractional crystallization which was the dominant mechanism of differentiation and evolution process. Magma was rich in water, so that a lot of brown hornblendes were crystallized, and hornblendite was formed. The rock body contained a large number of xenoliths in Jinshuikou Terrane of Paleoproterozoic, and the assimilation-contamination was serious. The intrusion included two layered ore bodies, and the altitudes of them were 3 100 m and 2 800-2 900 m, respectively. In addition, at the western end of rock body, there was a hydrothermal ore body in the fault zone which had been migrated and activated by faults. The structures of ore mainly included disseminated, sponge iron meteorite and massive; mineralization process could be divided into three periods(magmatic period, slurry period and magmatic hydrothermal period)and four stages. The results showed that magmatic differentiation evolution and assimilation-contamination jointly led to sulfide liquation; mineralization process was multi-phase and multi-stage rather than continuous.

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Last Update: 2012-12-20