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现代地质 ›› 2013, Vol. 27 ›› Issue (3): 537-546.

• 岩石学 • 上一篇    下一篇

云南格咱岛弧印支期地壳隆升与剥蚀及其地质意义:来自黑云母矿物压力计的证据

刘学龙1,2,李文昌1,2,3 ,尹光侯3   

  1. 1中国地质大学 地球科学与资源学院,北京100083;
    2昆明理工大学 国土资源工程学院,云南 昆明650093;
    3云南省地质调查局,云南 昆明650051
  • 收稿日期:2012-11-01 修回日期:2013-03-25 出版日期:2013-06-07 发布日期:2013-06-08
  • 通讯作者: 李文昌,男,教授,博士生导师,1962年出生,矿物学、岩石学、矿床学专业,主要从事云南省地质矿产勘查与研究工作。
  • 作者简介:刘学龙,男,博士研究生,1983年出生,矿物学、岩石学、矿床学专业,主要从事云南“三江”地区的地质矿产研究工作。Email:xuelongliu@foxmail.com。
  • 基金资助:

    国家重点基础研究发展计划“973”课题“巨型矿床形成保存及资源潜力”(2009CB421007);中央高校基本科研业务费专项资金资助项目(2011PY0154);中国地质调查局项目(1212011085137)。

The  Indosinian Crust Uplift-Denudation in Geza Arc of Yunnan Province and Its Geological Significance: Evidence from Biotite Geobarometer

LIU Xue-long 1,2, LI Wen-chang1,2,3 , YIN Guang-hou3   

  1. 1School of Earth Sciences and Resources, China University of Geosciences, Beijing100083, China;
    2Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, Yunnan650093, China;
    3Yunnan Geological Survey, Kunming, Yunnan650051, China
  • Received:2012-11-01 Revised:2013-03-25 Online:2013-06-07 Published:2013-06-08

摘要:

区域的隆升与剥蚀是影响成矿岩体形成后变化与保存的主要因素,矿物压力计能定量获取花岗质岩浆初始结晶时的压力条件,是研究花岗岩体形成深度及隆升剥蚀历史的有效手段之一。应用黑云母的TAl地质压力计,计算了云南格咱岛弧岩浆岩带印支期典型成矿斑岩体侵位的深度,并估算了格咱岛弧地区地壳的隆升与剥蚀速率,探讨了矿床形成后变化及保存的情况,结果表明印支期以来格咱岛弧地区的成矿岩体剥蚀速率较小,平均为0.018 mm/a,这对矿床形成后的保存较为有利。研究结果为探讨滇西高原印支期以来的构造隆升—剥蚀提供了定量参考。

关键词: 地壳隆升, 剥蚀速率, 变化与保存, 壳幔作用, 格咱岛弧, 云南

Abstract:

Regional uplift and denudation is one of the main factors that have effect on the changes and preservation after deposit formation. Mineral geobarometer can quantitatively obtain the initial crystallization pressure of granitic magma, which is also one of the effective methods to reflect granitic intrusion depth and uplift history. In this paper, we apply biotite TAl geobarometer to calculate the emplacement depth of typical ore-forming porphyries in Geza magmatic belts in Indosinian and to estimate the crust uplift-denudation rates. Also, we discuss the changes and preservation after deposit formation. The results indicate that the denudation rate of ore-bearing intrusion is rather slow with an average value of 0.018 mm/a, which is favorable to preserve the deposit after its formation. Our study also provides a quantitative reference for the tectonic uplift and denudation of the western Yunnan plateau since Indosinian.

Key words: crust uplift, denudation rate, change and preservation, crust-mantle interaction, Geza arc, Yunnan

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