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王磊,王加昇,王雷,郭泽华,韩润生,刘飞,崔峻豪.滇西南澜沧江带红豆山铜矿花岗斑岩地质地球化学特征及成岩时代[J].地质通报,2017,(7):1231-1241.
滇西南澜沧江带红豆山铜矿花岗斑岩地质地球化学特征及成岩时代    点此下载全文
王磊1  2  王加昇1  2  王雷1  2  郭泽华1  2  韩润生1  2  刘飞1  2  崔峻豪1  2
1. 昆明理工大学 国土资源工程学院, 云南 昆明 650093;
2. 有色地质调查中心西南地质调查所, 云南 昆明 650093
基金项目:云南省应用基础研究计划项目《滇西云县红豆山铜矿床流体地球化学和成矿年代学研究》(编号:201401CD00230)、云南省矿产资源预测评价工程实验室及省、校创新团队项目
DOI:
摘要:
      南澜沧江火山弧带红豆山花岗斑岩属于过铝质钾玄岩性S型花岗岩,SiO2含量为71.1%~74.4%,全碱含量高(K2O+Na2O=8.4%~9.4%),富钾(K2O/Na2O=3.9~5.0),铝饱和指数(A/CNK)为1.06~1.21;具轻稀土元素富集特征,负Eu异常(δEu=0.53~0.74);相对富集大离子亲石元素(LILE,如Rb、Ba、Th、U等),但亏损Sr、P、Ti等元素。地球化学特征表明,红豆山花岗斑岩具火山弧花岗岩与同碰撞花岗岩的特征,为活动大陆边缘弧的产物。红豆山花岗斑岩的LA-ICP-MS锆石U-Pb年龄为220.3±3.6Ma,形成于晚三叠世。红豆山花岗斑岩的地球化学特征和形成时代与小定西组基性火山岩非常相似,两者是同一期岩浆活动不同阶段的产物。
关键词:南澜沧江带  花岗斑岩  LA-ICP-MS锆石 U-Pb年龄  地球化学  小定西组
Geological and geochemical characteristics and age of gran-ite porphyry in the Hongdoushan copper deposit, South Langcangjiang belt, western Yunnan Province    Download Fulltext
WANG Lei1  2  WANG Jiasheng1  2  WANG Lei1  2  GUO Zehua1  2  HAN Runsheng1  2  LIU Fei1  2  CUI Junhao1  2
1. Faculty of Land Resource Engineering, Kunming University of Science and Techology, Kunming 650093, Yunnan, China;
2. Southwest Institute of Geological Survey, Geological Survey Center for Nonferrous Metals Resources, Kunming 650093, Yunnan, China
Fund Project:
Abstract:
      The Hongdoushan granite porphyry in the South Langcangjiang volcanic arc zone is a peraluminous and shoshonite Stype granitoid. The granite porphyry contains 71.1%~74.4% of SiO2, high total alkalis (K2O+Na2O=8.4%~9.4%), high K and high A/CNK of 1.06~1.21, and is characterized by enrichment of light rare earth elements with negative europium anomalies (δEu=0.53~0.74), relative enrichment of large ion lithophile elements (LILE) such as Rb, Ba, Th and U, and relative depletion of Sr, P and Ti. Geochemical features indicate that the Hongdoushan granite porphyry has characteristics of volcanic arc granite and syn-collision granite, and is epicontinental arc-volcanic rock. LA-ICP-MS zircon U-Pb dating age of the Hongdoushan granite porphyry is 220.3±3.6Ma, indicating that the rock was formed during Late Triassic. Geochemical features and formation age of the Hongdoushan granite porphyry is very similar to features of basic volcanic rock of Xiaodingxi Formation, which suggests that they are products of different stages of the same magmation.
Keywords:South Langcang belt  granite porphyry  LA-ICP-MS zircon U-Pb age  geochemistry  Xiaodingxi Formation
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