[1]吴 凯,张丽鹏,江小燕.2020.云南铺台山花岗斑岩的地球化学特征、锆石SHRIMP U-Pb年龄及其地质意义.大地构造与成矿学,44(5):986-997.doi:10.16539/j.ddgzyckx.2020.05.011
　WU Kai,ZHANG Lipeng,JIANG Xiaoyan.2020.Geochemical Characteristics and SHRIMP Zircon U-Pb Age of the Putaishan Granite Porphyry and Their Geological Implications.Geotectonica et Metallogenia,44(5):986-997.doi:10.16539/j.ddgzyckx.2020.05.011
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云南铺台山花岗斑岩的地球化学特征、锆石SHRIMP U-Pb年龄及其地质意义
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2020年44卷05期
页码:
986-997
栏目:
岩石大地构造与地球化学
出版日期:
2020-10-20

文章信息/Info

Title:
Geochemical Characteristics and SHRIMP Zircon U-Pb Age of the Putaishan Granite Porphyry and Their Geological Implications
文章编号:
1001-1552(2020)05-0986-012
作者:
吴 凯1;  张丽鹏2.3;  江小燕4;  张玉泉4;  孙卫东2.3.5;  袁洪林1
1.西北大学 地质学系, 大陆动力学国家重点实验室, 陕西 西安 710069; 2.青岛海洋科学与技术国家实验室 海洋地质过程与环境功能实验室, 山东 青岛 266061; 3.中国科学院 海洋研究所 深海研究中心, 山东 青岛 266071; 4.中国科学院 广州地球化学研究所 矿物学与成矿学重点实验室, 广东 广州 510640; 5.中国科学院 青藏高原地球科学卓越创新中心, 北京 100101
Author(s):
WU Kai1;  ZHANG Lipeng2.3;  JIANG Xiaoyan4;  ZHANG Yuquan4;  SUN Weidong2.3.5 and YUAN Honglin1
1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, Shanxi, China; 2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, Shandong, China; 3. Center of Deep Sea Research, Institute of Oceanography, Chinese Academy of Sciences, Qingdao 266071, Shandong, China; 4. CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China; 5. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China
关键词:
碱性侵入岩;  铺台山;  锆石SHRIMP U-Pb年龄;  哀牢山-金沙江碱性岩带
Keywords:
alkaline intrusion;  Putaishan;  zircon SHRIMP U-Pb;  Ailaoshan-Jinshajiang fault
分类号:
P67
DOI:
10.16539/j.ddgzyckx.2020.05.011
文献标志码:
A
摘要:
云南省鹤庆县铺台山花岗斑岩是哀牢山-金沙江碱性岩带北衙-六合地区的一个钾质碱性侵入体。本文对该岩体进行了全岩主、微量元素和锆石SHRIMP U-Pb年龄分析。结果显示铺台山花岗斑岩显示出高钾、富碱的特征, 同时具有低全岩Mg#值(0.20~0.32), 低母岩浆温度和岩浆氧逸度, 以及较浅的岩浆起源深度。锆石定年结果为~34 Ma, 指示岩体侵位时代为始新世。结合前人对该区域碱性侵入岩Pb同位素研究结果和花岗斑岩锆石核部年龄(218~541 Ma), 认为哀牢山-金沙江地区发生强烈剪切-走滑的过程中, 哀牢山-金沙江新生代富碱侵入岩带中的氧化性富钾斑岩体可能与古俯冲带下被扰动的碳酸盐化地幔橄榄岩的部分熔融有关; 同时印度板块和欧亚板块碰撞造成哀牢山-金沙江地区的强烈伸展和剪切作用诱发地幔上涌, 地幔上涌带来的热量使得深部地壳脱水并产生还原性流体, 铺台山花岗斑岩可能就是富钾地壳物质在这些还原性流体的参与下发生减压熔融的产物。
Abstract:
The Putaishan granite porphyry is an alkali-rich intrusion in Heqin, Yunnan province. In this study, we conducted whole-rock major and trace element analyses and zircon SHRIMP U-Pb dating of the Putaishan granite porphyry. The Putaishan granite porphyry has high K2O and Na2O+K2O contents, low Mg# (0.20-0.32), low magma temperature, oxygen fugacity and shallow melting depth. Zircon SHRIMP U-Pb dating yielded a crystallization age of ca.34 Ma, indicating that the Putaishan intrusion was emplaced in the Eocene epoch. Combined the obtained ages (218-541 Ma) of zircon cores and previous Pb isotope results on alkali intrusions in this region, we propose that the Cenozoic oxidized alkali-rich intrusions in the Ailaoshan-Jinshajiang belt are possibly resulted from partial melting of carbonated metasomatized mantle peridotite beneath the ancient subduction zone during the divergent strike-slip movements of the Ailaoshan-Jinshajiang faults. Meanwhile, the extension and shearing caused by the collision between the India and the Eura-Asia block in the Ailaoshan-Jinshajiang region triggered the upwelled mantle that supplied heat for dehydration of the deep crust which produced crust-derived reduced fluids, and the decompression melting of the lower crustal materials with the aid of such reductive fluids resulted in the formation of the Putaishan granite porphyry.

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备注/Memo

备注/Memo:
收稿日期: 2018-11-20; 改回日期: 2020-03-15
项目资助: 国家自然科学基金青年基金项目(41903009)和第64批中国博士后科学基金(2018M643711)联合资助。
第一作者简介: 吴凯(1990-), 男, 博士后, 从事元素和同位素地球化学的研究工作。Email: wukaitwo@163.com
更新日期/Last Update: 2020-10-20