西藏桑日则黑色岩系构造热液型铅锌矿定位预测研究

发布时间：2018-10-08 09:06

【摘要】：桑日则铅锌多金属矿床位于是西藏扎西康整装勘查区内的大型铅锌锑银共生矿床之一.藏南扎西康整装勘查区位于雅鲁藏布江缝合带以南,藏南拆离系以北,地处喜马拉雅特提斯造山带中东部.桑日则矿床地层主要为下侏罗统日当组的浅变质黑色岩系,容矿岩石为含碳钙质板岩、钙质板岩和构造角砾岩,矿体严格受近南北向和北东断裂控制,呈脉状、透镜状产出.通过区域地质和极化性质研究,以及金属追踪圈定成矿有利区,结合地质构造演化和桑日则矿区三维重力反演,认为褶皱两翼及轴面部位为有利地带.在此基础上,开展精细的综合剖面测量工作和反演,认为矿体具有中低电阻和中低极化地球物理物性特征.在中低极化率区域并存在断裂,且在断裂走向的垂直方向存在高极化、低电阻区,那么赋矿的可能较大,并根据成果验证,对深部矿体进行准确定位.
[Abstract]:Therefore, one of the large Pb Zn SB Ag symbiotic deposits in Zaxikang, Tibet. Zaxikang complete exploration area in southern Tibet is located south of the Yarlung Zangbo River suture belt, north of the south Tibet detachment system, and is located in the central and eastern part of the Himalayan Tethys orogenic belt. The strata of the Sangerzhai deposit are mainly of the shallow metamorphic black rock series of the Lower Jurassic Ridang formation. The ore-bearing rocks are carbonaceous calcareous slate, calcareous slate and tectonic breccia. The orebodies are strictly controlled by the NNE and NNE faults and are vein-like and lenticular. Based on the study of regional geology and polarization characteristics, the metallogenic favorable area delineated by metal tracing, combined with geological tectonic evolution and three-dimensional gravity inversion of Sangzizai ore area, it is considered that the fold flanks and axial facial position are favorable zones. On this basis, the detailed comprehensive profile measurement and inversion are carried out. It is considered that the orebody has the characteristics of middle and low resistivity and middle and low polarization geophysical properties. There are faults in the low and middle polarizability region and high polarization and low resistance in the vertical direction of the fault strike, so the ore-bearing area is likely to be large, and the deep orebody is accurately located according to the results.
【作者单位】：中国地质调查局成都地质调查中心;
【基金】：国家重点研发计划(2016YFC060308) 中国地质调查局项目(121201010000150014)联合资助
【分类号】：P618.4;P631

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