文章摘要
徐新文,段建华,徐加球,白强,路耀祖.青海五龙沟金矿幔枝构造成矿与深部矿源[J].矿产勘查,2018,9(10):1888-1901
青海五龙沟金矿幔枝构造成矿与深部矿源
The Mantle Branch Structure Mineralization and Deep Mineral Sources of the Wulonggou Gold Deposit in East Kunlun, Qinghai
投稿时间:2018-01-08  
DOI:
中文关键词: 五龙沟  金矿田  幔枝构造  成矿过程  深部矿源
英文关键词: Wulonggou, gold mine field, mantle branch structure, metallogenic process, deep mineral source
基金项目:青海省格尔木市白日其利地区金多金属矿调查评价”项目(工作项目编码:12120113030300)资助。
作者单位
徐新文 青海省核工业地质局, 西宁 810008 
段建华 青海省核工业地质局, 西宁 810008 
徐加球 青海省核工业地质局, 西宁 810008 
白强 青海省核工业地质局, 西宁 810008 
路耀祖 青海省核工业地质局, 西宁 810008 
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中文摘要:
      文章论述了五龙沟金矿田的区域幔枝构造特征、矿区幔枝构造特征、矿床幔枝构造特征及其成矿过程,进一步通过硫、铅、氢、氧、碳同位素特征及流体包裹体特征的分析,认为矿田位于可可西里-巴颜喀拉地幔亚热柱东昆仑幔枝构造区,受五龙沟变质核杂岩构造的控制,变质核杂岩是幔枝构造活动晚期阶段在地表的表现形式,岩浆侵入以及南北向应力作用形成变质核杂岩构造及其北西向的韧脆性断裂系统。矿质来源为深部幔源,深切地幔的超岩石圈韧性断裂沟通了深部及地表,金银多金属矿源随岩浆沿北西向韧性断裂侵入而向地表运移,在构造扩容段成矿。超岩石圈韧性断裂其深部表现为韧性剪切变形,浅部表现为脆性断裂,金银多金属矿含矿热液在韧性剪切带与脆性断裂的构造转换部位成矿,受北西向的韧脆性断裂控制,主成矿时代为幔枝构造产物变质核杂岩构造活动的印支期,其余阶段为次要成矿阶段,不具备主导地位。
英文摘要:
      This paper discussed the regional mantle branch structure characteristics, mine field mantle branch structure characteristics and deposit mantle branch structure characteristics of Wulonggou gold deposit and its metallogenic process,conducted detail anylsis on isotope characteristics of sulfur, lead, hydrogen, oxygen and carbon and characteristics of fluid inclusions, and then concluded that the ore field is located in the Kekexili - Bayankala Sub-mantle plume area and is controlled by Wulonggou metamorphic core complex structure; the metamorphic core complex in the mine field is in the late stage mantle branch structure activity' results which appear on ground; the metamorphic core complex structure and NW ductile-brittle fracture system formed under the forces of the magma intrusion and NS stresses. In addition,it has been concluded that the ore-forming sources came from deep mantle, the translithospheric ductile fracture in deep mantle passed from deep to surface, the gold and silver polymetallic magma intruded into NW ductile fracture and migrated towards the surface and formed ores in the expansion area.The deep part of the translithospheric ductile fracture is characterized as ductile shear deformation, while the shallow part is characterized as brittle fracture. The gold and silver polymetallic ore-bearing hydrothermal transformed into ores in the conversion site of ductile shear zone and brittle fracture, where is controlled by the NW ductile-brittle fracture. The main metallogenic epoch is indo-chinese period when the mantle branch structure resulted in the metamorphic core complex tectonic activities. Other secondary mineralization stages do not have the leading position in ore-forming.
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