The discovery and genetic discussion of Zhuyuangou molybdenum deposit in Ruyang County, Henan Province
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摘要:
河南汝阳竹园沟钼矿床是在东秦岭-大别山钼成矿带新发现的钼矿床，估算钼金属量9.59万t，平均品位0.10%，储量为中型。该钼矿是在燕山晚期侵入花岗岩体内找钼取得的新进展。竹园沟花岗岩为太山庙花岗岩体的一部分，具陆内造山作用后期拉张环境下A型花岗岩特征。矿体赋存于燕山晚期第三次侵入的正长花岗斑岩与第一次侵入的中粗粒正长花岗岩的内接触带，矿体呈似层状、透镜状产出，矿床类型为斑岩型钼矿床。在全面分析该区成矿地质条件、化探异常特征的基础上，以寻找斑岩型矿开展勘查工作，逐步认识、实践，最终取得了找矿突破。通过对矿床地质特征研究，总结了以下找矿关键部位：（1）燕山晚期花岗岩区内1：5万Mo地球化学异常地段；（2）不同比例尺Mo元素地球化学异常重叠部位；（3）与区域NE向断裂方向一致，彼此大致平行的小型断裂构造带、裂隙发育带或密集带；（4）燕山晚期太山庙A型花岗岩内不同期次花岗岩侵入体内接触带附近；（5）从成因上看属于斑岩型钼矿床。竹园沟钼矿床的发现，为在东秦岭-大别山钼成矿带找矿提供了新的思路。
Abstract:The Zhuyuangou molybdenum deposit was newly found in the East Qinling-Dabie Mountain metallogenic belt. It is estimated that the amount of molybdenum metal is 95.9 thousand ton, with the average grade being 0.10%, reaching medium-sized reserves. The discovery of this deposit is a new progress in the prospecting for molybdenum deposits in the inner part of the late Yanshanian granite mass.The Zhuyuangou granite mass is a part of the Taishanmiao granite batholite, and possesses the features of A-type granite characterized by later intracratonic orogenesis in an extensional environment.The orebody occurs in the inner contact zone of the third intrusive syenogranite-porphyry and the first intrusive medium-coarse syenogranite of late Yanshanian period. It exhibits stratoid or lenticular form, suggesting a porphyry molybdenum deposit. Through a comprehensive analysis of the metallogenic geological conditions and geochemical anomaly characteristics, the authors carried out prospecting work step by step and, through repeated understanding and practice, finally made the breakthrough. Based on geological characteristics of the molybdenum deposit, the authors summed up the following key prospecting positions:(1) area of molybdenum 1:50000 geochemical anomaly in late Yanshanian granite mass; (2) superposition of different scales of Mo geochemical anomalies; (3) basically parallel small faulted structural zones and fissure-developed or crowded zones which are consistent with regional NEtrending fault; (4) around the inner contact zones of the different intrusive bodies of late Yanshanian Taishanmiao A-type granite; (5) Genetically, it belongs to porphyry molybdenum deposit. The discovery of this deposit provides new training of thought for the prospecting work in the East Qinling-Dabie Mountain metallogenic belt.
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