摘要
纳日贡玛斑岩型铜钼矿是近年来在三江北段发现的与侵入岩有关的斑岩型铜钼矿。作者首次利用锆石U-Pb方法测得纳日贡玛花岗闪长斑岩的形成年龄为41.44±0.23Ma,属于喜马拉雅早期。纳日贡玛斑岩型铜钼矿成矿主要在40.8±0.4Ma～40.86±0.85Ma之间。在多期热液叠加,多期成矿作用中,纳日贡玛斑岩型铜钼矿的热液应是纳日贡玛黑云花岗斑岩(41.53±0.24Ma～43.8±0.4Ma)、纳日贡玛花岗闪长斑岩(41.44±0.23Ma)和纳日贡玛斜长花岗斑岩(41.00±0.18Ma)共同提供的。由于该区有较多的中酸性岩体存在,因而,这些侵入体的形成年龄确定,为印度板块与亚洲板块在65～45Ma碰撞提供依据,对于在该区寻找斑岩型铜钼矿不仅有重要的理论意义,而且有重要的现实意义。
The Narigongma porphery molybdenite copper deposit related to intrusive rocks was discovered recently in the northern part of the Sanjiang Region.U-Pb dating shows that the formation age of Narigongma granodiorite porphyry is 41.44±0.23 Ma,belonging to early Himalayan period.Metallogenic ages of the Narigongma porphery molybdenite copper deposit are mainly in the range of 40.8±0.4 Ma～40.86±0.85 Ma.During multiperiodic hydrothermal activities and multistage ore-forming processes,the metallogenetic hydrothermal solution was provided by Narigongma granitite porphyry（41.53±0.24 Ma）,Narigongma granite diorite-porphyry（41.44±0.23 Ma） and Narigongma plagioclase porphyry（41.00±0.18 Ma）.Due to occurrence of many intermediate-acid mass,the age of these intrusive bodies provide evidence for collision function between India plate and Eurasian plate in 65～45 Ma,which has theoretical and practical meaning to forecast of porphyry copper-molybdenum deposit in the region.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2011年第2期154-162,共9页
Acta Geoscientica Sinica
基金
中国地质调查局"青海省地质调查综合研究"(编号:1212010918044)
"青海省岩浆岩的时空分布与成矿作用研究工作项目"(编号:科〔2011〕01-06-02号)联合资助
