江西大湖塘北区石门寺矿段钨矿成矿条件与找矿预测

发布时间：2018-06-01 18:46

本文选题：大湖塘矿集区 + 石门寺矿段　；参考：《吉林大学学报(地球科学版)》2017年03期

【摘要】：在大湖塘北区钨矿找矿勘查过程中,在总结分析20世纪80年代初针对石英大脉型黑钨矿的普查资料基础上,通过地表填图和老窿编录,发现前人认为的混合黑云母花岗岩与混合白云母花岗岩之间为截然清楚的侵入接触关系,二者之间稳定地分布着一层似伟晶岩壳;由空间关系和区域成矿规律推断似斑状黑云母花岗岩为燕山期侵入于晋宁期黑云母花岗闪长岩之中的成矿母岩。晋宁期黑云母花岗闪长岩为成矿有利围岩,在云英岩化等蚀变过程中释放出形成白钨矿的钙离子。燕山期似斑状黑云母花岗岩岩株与晋宁期黑云母花岗闪长岩岩基之间的侵入接触界面是最主要的成矿构造与成矿结构面,控制了主矿体的位置、形态与产状。在研究区内首次于新元古代花岗闪长岩中发现厚大的白钨矿工业矿体,并根据不同岩块混杂、被长英质充填物胶结等特征识别出热液隐爆角砾岩型矿体。基于对矿区成矿地质条件和矿床地质特征的新认识,修改了针对石英大脉型黑钨矿所做的详查设计,抓住细脉浸染型白钨矿这一主要矿床类型,及时调整了找矿目标和勘查手段,在短时间内实现了赣北地区钨多金属找矿的重大突破。通过与石门寺矿段成矿地质条件类比,预测毗邻的苗尾矿段与太平洞矿区找矿潜力大。
[Abstract]:In the process of prospecting and exploration of tungsten deposits in the northern part of Dahutang, on the basis of summing up and analyzing the general survey data of quartz wolframite in the early 1980s, surface mapping and cataloguing of the old wolframite are carried out. It is found that the relationship between the mixed biotite granite and the mixed Muscovite granite is a distinct and clear intrusive contact relationship, and a pegmatite crust is distributed stably between the two. Based on the spatial relationship and regional metallogenic regularity, it is inferred that porphyritic biotite granodiorite intruded into Jinning biotite granodiorite in Yanshanian period. In Jinning period biotite granodiorite is favorable for ore-forming surrounding rock and the calcium ions formed in scheelite are released during the alteration process of quartzite. The intrusive contact interface between Yanshanian porphyry biotite granite and Jinning biotite granodiorite bedrock is the main ore-forming structure and ore-forming structure plane, which controls the position, morphology and occurrence of the main orebody. In the study area, the thick industrial wolframite ore bodies were first found in Neoproterozoic granodiorite, and hydrothermal crypto-explosive breccia orebodies were identified according to the characteristics of different rock blocks mixed and cemented by feldspathic fillings. Based on the new understanding of ore-forming geological conditions and geological characteristics of ore deposits, the detailed investigation and design of quartz wolframite with large veins are modified, and the main ore deposit type of fine vein disseminated scheelite is grasped. The prospecting target and exploration method were adjusted in time, and the important breakthrough of tungsten polymetallic prospecting in north Jiangxi was realized in a short time. By analogy with the metallogenic geological conditions of the Shimensi section, it is predicted that the adjacent Miao tailings and Taiping Dong mining areas have great prospecting potential.
【作者单位】：江西省地质矿产勘查开发局九一六大队;中国地质调查局天津地质调查中心;
【基金】：中国地质调查局项目(12120114034501)~~
【分类号】：P618.67

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