地学前缘 ›› 2011, Vol. 18 ›› Issue (3): 166-178.

• 论文 • 上一篇    下一篇

大兴安岭—小兴安岭地区中生代岩浆构造钼成矿地质事件序列的初步框架

刘翠，邓晋福，许立权，张昱，赵寒冬，孔维琼，李宁，罗照华，白立兵，赵国春，苏尚国   

  1. 1. 中国地质大学（北京）， 北京 100083
    2. 内蒙古自治区地质调查院， 内蒙古 呼和浩特 010020
    3. 黑龙江省区域地质调查所， 黑龙江 哈尔滨 150080
    4. 黑龙江省地质调查研究总院， 黑龙江 哈尔滨 150036
  • 收稿日期:2010-12-20 修回日期:2011-03-20 出版日期:2011-05-22 发布日期:2011-05-20
  • 作者简介:刘翠（1973—），女，博士，讲师，岩石学专业。Email：liucui@cugb.edu.cn
  • 基金资助:

    中国地质调查局项目（1212010911028，1212010881204）；国家自然科学基金项目（40802020）；国土资源部项目（1212010633902, 1212010633903，1212010711814)；中国地质大学地质过程与矿产资源国家重点实验室项目（GPMR 0735）

A preliminary frame of magmatectonicMo metallogenic events of Mesozoic Era in Da Hinggan Mountains and Xiao Hinggan Mountains areas.

  1. 1. China University of Geosciences (Beijing), Beijing 100083， China
    2. Geological Survey Institute of Inner Mongolia, Hohhot 010020， China
    3. Heilongjiang Province Institute of Regional Geology Survey, Harbin 150080, China
    4. Heilongjiang Institute of Geological Survey, Harbin 150036, China
  • Received:2010-12-20 Revised:2011-03-20 Online:2011-05-22 Published:2011-05-20

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摘要：

兴蒙造山带是中国一条重要的成矿带。通过近几年的调查研究，以及大量人力、物力和资金投入，在该区发现了一批大、中型钼矿床，但是钼矿产出的区域地质背景还不是很清楚。对该区中生代A型花岗岩类、地质图分析以及钼矿的研究得知：（1）研究区印支期和燕山期是两个独立的造山旋回，印支期造山在220~200 Ma左右结束，以区域上发育一套碱性、过碱性含晶洞的A型花岗岩类为标志。燕山期造山始于早侏罗世，并于早白垩世晚期进入后造山，以区域上分布的一套碱性、过碱性含晶洞的A型花岗岩类（如巴尔哲岩体、阿龙山岩体）为标志。（2）该区燕山期钼矿的主要成矿期有两期：180 Ma左右及130 Ma左右。180 Ma是燕山期造山的早期，主要为CuMo组合的矿床，有关的火成岩组合为英云闪长岩花岗闪长岩花岗岩花岗闪长斑岩花岗斑岩等；130 Ma是燕山期造山的晚期，系以Mo（W/U）为主的矿床，有关的火成岩组合为细粒花岗岩花岗斑岩石英斑岩霏细岩等。（3）研究区中生代可以大致识别出4次区域挤压逆冲事件：J1之后,J2之后,J3之后及K1之后4次。K2沉积把上述的逆冲构造全部不整合覆盖，区域挤压事件结束。因此，燕山期的钼矿成矿是在挤压造山的总体背景下，而不是岩石圈尺度伸展的大陆裂谷环境下形成的。

关键词: 兴蒙造山带, 岩浆构造钼矿事件序列, 中生代, 成矿时代, 挤压逆冲

Abstract:

MongoliaHinggan Orogen is an important metallogenic belt of China; many Modeposits were discovered in this belt recently owing to the great deal of input by government and companies. But the regional geological background of Modeposits remains unknown. Based on the study of igneous rocks, the regional geological maps and Modeposits, this paper reaches the following conclusions: (1) The Indosinian orogeny and Yanshanian orogeny are independent orogenic cycles; the Indosinian orogeny was ended at about 220200 Ma, which is marked by a suit of alkaline, peralkaline and miarolitic granites in the area; furthermore, the Yanshanian orogeny was started from the earlyJurraic and went into postorogeny at the late of earlyCretaceous, which is marked by another suit of alkaline, peralkaline and miarolitic granites in the area, as Baerzhe pluton, Alongshan pluton, etc..  (2) There are mainly two Mo metallogenic epochs in Yanshanian era: about 180 Ma and about 130 Ma; 180 Ma is the early time of Yanshanian orogeny, the deposits of this time were mainly CuMo deposits and the correlated igneous petrotectonic assemblage is  Tonalitegranodioritegranitegranodiorite porphyrygranite porphyry etc.; 130 Ma is the late time of Yanshanian orogeny, the deposits were mainly Mo（W/U）deposits and the correlated igneous petrotectonic assemblage is finegrained granitegranite porphyryquartz porphyryfelstone etc.. (3) About four regional compressionthrust events can be recognized: after J1, after J2, after J3 and after K1; the unconformity sediments of K2 had covered all of above thrust tectonics and the compressionthrust events were over. So, the formation of Modeposits of the Yanshanian was under the background of compressionthrust, rather than the background of continental rift by extension of lithosphere.

 

Key words: MongoliaHinggan Orogen, series of magmatictectonicMo metallogenic events, Mesozoic Era, metallogenic epoch, compressionthrust events

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