青海省阿达滩沟脑矿区地质特征及综合成矿预测
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摘要
青海祁漫塔格地区位于东昆仑造山带西段,区内经历了多期次、多阶段的复杂构造—岩浆活动,是青藏高原北部最重要的铁铜铅锌多金属成矿带。阿达滩沟脑位于祁漫塔格铁多金属成矿带上,区内岩浆活动强烈,断层发育,具有良好的找矿潜力。为查明该区成矿条件,选择未经查证的3处1∶50 000水系沉积物Hs_(乙3)~7、Hs_(乙3)~8和Hs_丙~6综合异常和高精度磁测C16号异常开展大比例尺地质测量、高精度磁测及土壤地球化学剖面测量工作,结合地质调查成果对异常高值区布置探槽进行查证,以查明矿致异常源和分布特征,并对成矿规律进行初步总结。研究表明:①土壤样品中Cu、Ni、Co是区内的主成矿元素且相关性好,其中Ni富集成矿的可能性较大,在剖面图上,Cu、Ni、Co、Cr高值异常分布较广,浓集中心相对突出;②高精度磁测在C16异常中心附近的异常强度尤为强烈,异常值与中酸性岩体,辉长、辉绿岩体以及NW向断裂构造吻合较好;③在地表矿化点及异常区地段经探槽工程查证,圈出了5条铅锌铜矿化带,7条矿体(其中5条铅锌矿体,2条铜矿体),圈定了可靠的找矿靶区,并进行了找矿潜力分析。上述分析进一步表明:该类矿体的发现加深了对区内成矿地质条件的认识,在高海拔地区采用地质、物探、化探综合勘查方法,并与成矿规律研究紧密结合,可实现找矿突破。
Qimantag area of Qinghai Province is located in the western part of East Kunlun Orogenic Belt,which possesses a complicated evolutional history and unique tectonic process.It is the most important polymetallic ore accumulated area in Northern Qinghai-Tibet Plateau.Adatangounao is located in the Qimantage iron-polymetallic metallogenic belt.In this area,the magmatic activity is strong,the faults is well developed and the prospecting potential is good.In order to find out the metallogenic conditions in this area,large-scale geological survey,high-precision magnetic survey and soil profile measurement are carried out on the basis of unconfirmed three 1∶50 000 stream sediment survey Hs_(乙3)~7、Hs_(乙3)~8 and Hs_丙~6 comprehensive anomalies and high-precision magnetic measurement C16 anomaly. The anomalous high concentration is performed by exploratory trenches,combined with geological survey to identify the source and distribution characteristics of the mining area and to summarize the metallogenic regularity.The study results show that:①Cu,Ni and Co are the main metallogenic elements in the soil samples and have good correlation,among them,possibility of enrichment and mineralization of Ni is high,high-value anomalies of Cu,Ni,Co and Cr are widely distributed in the profile,the concentration centers are relatively prominent;②the anomaly intensity of high-precision magnetic measurement is especially strong near C16 anomaly center,the abnormal value is consistent with the intermediate to acidic intrusive rocks,gabbro plutons,diabase dikes and NW trending regional faults;③five lead-zinc-copper mineralization zones and seven orebodies(including five lead-zinc orebodies and two copper orebodies)have been delineated by the exploratory trenches in the surface mineralization point and the anomalous area,reliable prospecting target area is delineated,and its prospecting potential is discussed.The above analysis results further indicated that the discovery of the orebodies have deepened the understanding of metallogenic conditions in Adatangounao Mining Area,and prospecting breakthrough can be obtained by using integrated exploration methods of geology,geophysical exploration and geochemical exploration,in close association with metallogenic regularity.
Qimantag area of Qinghai Province is located in the western part of East Kunlun Orogenic Belt,which possesses a complicated evolutional history and unique tectonic process.It is the most important polymetallic ore accumulated area in Northern Qinghai-Tibet Plateau.Adatangounao is located in the Qimantage iron-polymetallic metallogenic belt.In this area,the magmatic activity is strong,the faults is well developed and the prospecting potential is good.In order to find out the metallogenic conditions in this area,large-scale geological survey,high-precision magnetic survey and soil profile measurement are carried out on the basis of unconfirmed three 1∶50 000 stream sediment survey Hs_(乙3)~7、Hs_(乙3)~8 and Hs_丙~6 comprehensive anomalies and high-precision magnetic measurement C16 anomaly. The anomalous high concentration is performed by exploratory trenches,combined with geological survey to identify the source and distribution characteristics of the mining area and to summarize the metallogenic regularity.The study results show that:①Cu,Ni and Co are the main metallogenic elements in the soil samples and have good correlation,among them,possibility of enrichment and mineralization of Ni is high,high-value anomalies of Cu,Ni,Co and Cr are widely distributed in the profile,the concentration centers are relatively prominent;②the anomaly intensity of high-precision magnetic measurement is especially strong near C16 anomaly center,the abnormal value is consistent with the intermediate to acidic intrusive rocks,gabbro plutons,diabase dikes and NW trending regional faults;③five lead-zinc-copper mineralization zones and seven orebodies(including five lead-zinc orebodies and two copper orebodies)have been delineated by the exploratory trenches in the surface mineralization point and the anomalous area,reliable prospecting target area is delineated,and its prospecting potential is discussed.The above analysis results further indicated that the discovery of the orebodies have deepened the understanding of metallogenic conditions in Adatangounao Mining Area,and prospecting breakthrough can be obtained by using integrated exploration methods of geology,geophysical exploration and geochemical exploration,in close association with metallogenic regularity.
引文
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