滇西潞西地区晚寒武世岩浆构造热事件的新认识

doi:10.13686/j.cnki.dzyzy.2021.05.003

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摘要保山地块作为冈瓦纳大陆的重要组成部分，其西缘发育有以平河岩体为代表的大量早古生代侵入岩，但由于缺少野外调查资料，其地质意义存在长期争议.通过1：5万区域地质调查，详实的野外接触关系证实平河岩体存在两期侵入岩.沉积作用及年代学、岩石地球化学等赋予了其新的地质意义.潞西地区早期侵入岩主要岩石类型为二长花岗岩，应用LA-ICP-MS获得锆石U-Pb年龄为488.3±3.9 Ma.通过主、微量元素分析，其岩石属高温富黑云母含堇青石过铝花岗岩，属高钾钙碱系列岩石，具中等负Eu异常稀土特征，属"南岭型"花岗岩.结合沉积作用和区域地质构造背景，认为该期侵入岩为晚寒武世保山地块与腾冲地块碰撞拼合后上地壳部分熔融产物.

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	宋冬虎
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	田素梅

关键词 ：保山地块, 晚寒武世, 后碰撞, 二长花岗岩, U-Pb锆石年龄, 滇西

Abstract：A large number of Early Paleozoic intrusive rocks represented by Pinghe pluton are developed on the western margin of Baoshan block-an important part of Gondwana. However, due to the lack of field survey data, its geological significance has long been disputed. Based on the 1:50 000 regional geological survey, the detailed field contact relationship has confirmed the existence of two stages of intrusive rocks in Pinghe pluton, and sedimentation, chronology and petrogeochemistry have endowed it with new geological implication. The early intrusive rocks in Luxi area are mainly monzogranites, with the LA-ICP-MS zircon U-Pb age of 488.3±3.9 Ma. The major and trace element analysis results show that the rock belongs to high-temperature biotite-rich cordierite-bearing peraluminous granite of high-K calc-alkali series, with REE characteristics of medium negative Eu anomaly, classified as the Nanling type of granite. Combined with sedimentation and regional geological tectonic background, it is considered that the intrusive rock is the product of upper crust partial melting after the collision of Baoshan block and Tengchong block in the Late Cambrian.

Key words： Baoshan block Late Cambrian post-collision monzogranite U-Pb zircon age western Yunnan

收稿日期: 2020-04-20

PACS:

P579

基金资助:云南省省级财政预算项目"云南省矿产资源总体规划（2021-2025年）""云南省‘十四五’自然资源规划"；云南省自然资源厅地勘基金项目"云南1：5万曼彦等5幅区域地质调查"（D2017013）.

通讯作者: 刘兵(1984-),男,高级工程师,从事区域地质调查工作,通信地址:云南省昆明市官渡区云南省国土资源规划设计研究院,E-mail//bb5167@126.com E-mail: bb5167@126.com

作者简介: 宋冬虎(1986-),男,工程师,从事矿产资源规划及区域地质调查工作,通信地址云南省昆明市官渡区云南省国土资源规划设计研究院,E-mail//380097649@qq.com

引用本文:

宋冬虎, 刘兵, 路永岩, 刘晓玮, 包佳凤, 王燕, 刘军平, 孙柏东, 田素梅. 滇西潞西地区晚寒武世岩浆构造热事件的新认识[J]. 地质与资源, 2021, 30(5): 533-543.
SONG Dong-hu, LIU Bing, LU Yong-yan, LIU Xiao-wei, BAO Jia-feng, WANG Yan, LIU Jun-ping, SUN Bai-dong, TIAN Su-mei. THE LATE CAMBRIAN MAGMATIC TECTONIC THERMAL EVENTS IN LUXI AREA, WESTERN YUNNAN: A New Understanding. GEOLOGY AND RESOURCES, 2021, 30(5): 533-543.

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