东秦岭汝阳南部钼铅锌矿集区综合找矿信息及成矿模式研究

东秦岭汝阳南部钼铅锌矿集区包括4个大中型矿床和45个小型矿床(点),已知矿床(点)大都产于中元古界长城系熊耳群鸡蛋坪组火山岩中,近EW向断裂构造是区内的控岩、控矿断裂,燕山晚期的复式花岗岩控制了矿集区的产出,而第3阶段侵入的钾长花岗斑岩与钼铅锌矿的成矿具有密切的成因联系;区内矿床大部分处于熊耳群火山岩分布的杂乱磁场区,重要的铅锌矿床均产于太山庙花岗岩造成的重力负值异常区的外围;水系沉积物的Mo-Pb-Zn-Ag-Au-As综合异常几乎囊括了杨坪—王坪所有的钼铅锌矿床;自然重砂异常以高温矿物组合异常为中心,中温铅族异常环绕,向外重晶石、毒砂等低温矿物异常依次分布,显示出清晰的矿物温度分带特点;基于矿集区的综合找矿信息建立了钼铅锌矿的成矿模式,为进一步的找矿勘查提供依据。

Mineral resources and the metallogenic model of southern Ruyang ore deposit-clustered area in eastern Qinling region

The southern Ruyang molybdenum-lead-zinc deposit-clustered area in east Qinling includes 4 medium-large size and 45 small size ore deposits or occurrences.These ore deposits or occurrences occur generally in volcanic rock of Jidanping Formation of Xiong＇er Group of Changcheng System.Fractures trending in EW direction control the volcanic rock and the ore.The Late Yanshanian complex granitic rock bodies control the whole ore deposit-clustered area.The third stage alkali feldspar porphyry granite is closely related to the ore.Most of the deposits occur in the areas where anomlies are distributed in mess.Major Pb-Zn ore deposits all occur in the surrounding of negative gravity anomly area caused by Taishanmiao granite.Mo-Pb-Zn deposits in Yangping-Wangping area are all included in the river sediment anomly of Mo-Pb-Zn-Ag-Au-As.The natural heavy mineral anomly is centered by the high temperature mineral of sheelite and bismuthite and superimposed by ring Pb anomly.Therefore,the anomly is outward from the center to the mesothermal Pb group minerals and further more epithermal barite,arsenopyrite with clear zoning.Based on the comprehensive information for prospecting Mo-Pb-Zn mineral resources in the area the metallogenic model is built providing guidance for further prospecting.