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班怒成矿带中段雄梅地区碰撞后含铜岩浆岩类型、时代及成因
投稿时间:2019-02-28  修订日期:2019-05-28  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2019178
摘要点击次数: 82
全文下载次数: 121
作者单位E-mail
黎心远 中国地质科学院矿产资源研究所 lixinyuanmomo@163.com 
曲晓明 中国地质科学院矿产资源研究所 xiaominqu@163.com 
马旭东 中国地质科学院矿产资源研究所  
陈伟 中国地质科学院矿产资源研究所  
孙渺 中国地质大学(北京)地球科学与资源学院  
中文摘要:内容提要:雄梅地区位于西藏班公湖-怒江成矿带中段申扎县,区内分布有舍索矽卡岩型铜多金属矿,雄梅斑岩型铜钼矿,以及桑日、苦嘎矽卡岩铜矿点,相应地发育多套含铜岩浆岩。本文通过系统的锆石U-Pb年龄、全岩Pb同位素及岩石地球化学分析,厘定了这些含铜岩浆岩的时代和成因类型。初步查明它们先后形成于约110Ma(舍索,雄梅,苦嘎)和80Ma(桑日)两个个岩浆活动阶段。Pb同位素表明岩浆源区均是来自上地壳,其中雄梅矿区的含矿花岗闪长斑岩具高铝、钙碱性特征,为由泥砂质沉积岩生成的S型花岗岩。舍索、桑日、苦嘎矿区的含矿岩体均为I型,显示原岩为火成岩。岩石地球化学表明这些含矿岩体富集大离子亲石元素(Rb、Sr、Th、Pb),亏损高场强元素(Nb、Ta、Ti),显示出俯冲沉积物组分对岩浆形成产生过重要影响。同时,这些地壳来源的含矿岩浆在上升侵位过程中发生了不同矿物的分离结晶作用:雄梅矿区的花岗闪长岩主要受黑云母的分离结晶控制,舍索矿区的二长花岗岩表现为斜长石的分离结晶趋势,苦嘎矿区则显示出钾长石的分离结晶倾向,桑日矿区则呈现出角闪石的分离结晶特点。本文的这些研究成果深化了对班-怒成矿带中段铜多金属成矿过程的理解,对区域地质找矿具有重要的指导意义。
中文关键词:雄梅地区含铜岩浆岩  锆石U-Pb定年  岩石地球化学  分离结晶作用
 
Age, types and genesis of post-collisional copper bearing magmatic rocks in Xiongmei area, the middle part of the Bangong Co-Nujiang metallogenic belt
Author NameAffiliationE-mail
lixinyuan MLR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing lixinyuanmomo@163.com 
quxiaoming MLR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing xiaominqu@163.com 
Ma Xudong Institute of Mineral Resources, Chinese Academy of Geological Sciences  
Chenwei Institute of Mineral Resources, Chinese Academy of Geological Sciences  
Sunmiao China University of Geosciences, Beijing  
Abstract:Xiongmei area is located in Shenzha County, the middle part of Bangong Co-Nujiang metallogenic belt in Tibet. There are Shesuo skarn copper polymetallic deposit, Xiongmei porphyry copper-molybdenum deposit, Sangri karn copper deposits and Kuga skarn copper deposits. Accordingly, many sets of copper-bearing magmatic rocks are developed. In this paper, the age and genetic types of these copper-bearing magmatic rocks have been determined by systematic zircon U-Pb age, whole-rock Pb isotope, and petrogeochemical analysis. It is preliminarily ascertained that they formed in ~110 Ma (Shesuo, Xiongmei, Kuga) and 80 Ma (Sangri) magmatic stages successively. The Pb isotope indicates that the magma source areas are all from the upper crust, and the ore-bearing granodiorite porphyry in Xiongmei mining area is S-type granite formed by argillaceous sedimentary rocks with high aluminium and calc-alkaline characteristics. The ore-bearing rocks in the Shesuo, Sangri and Kuga mining areas are I-type, indicating that the original rocks are igneous. Geochemistry shows that these ore-bearing rocks are rich in large ion lithophile elements (Rb, Sr, Th, Pb) and depleted in high field strength elements (Nb, Ta, Ti), indicating that subduction sediment components have an important influence on magma formation. At the same time, the mineral separation and crystallization of ore-bearing magma from these crustal sources occurred during the process of uplift and emplacement: the granodiorite in Xiongmei mining area is mainly controlled by the separation and crystallization of biotite, the monzogranite in Shesuo mining area shows the trend of plagioclase crystallization, the Kuga mining area shows the trend of potash feldspar crystallization, and the Sangri mining area shows the trend of amphibole crystallization. Separation crystallization characteristics. These research results deepen the understanding of the copper-polymetallic metallogenic process in the middle part of Ban-Nu metallogenic belt and have important guiding significance for regional geological prospecting.
keywords:Xiongmei area  Zircon U-Pb ages  geochemistry  Pb isotopes  Separation crystallization
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