青海夕昌沟金矿地质特征、控矿因素及找矿方向
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摘要
夕昌沟金矿区地处西秦岭造山带西端,岩浆-构造活动强烈,成矿地质条件优越。根据1:2. 5万水系沉积物测量,在矿区北部和南部分别圈出ASⅠ号和ASⅥ号两处异常,经对两处综合异常进行查证,并依据目前所发现的矿化带所处的空间位置以及矿化特征,将该矿区划分为南、北两个矿化带。其中,北部矿化带发现金、金银、铅银矿化体3条;南部矿带发现金矿(化)体21条。金矿(化)体主要就位于碎裂岩化构造破碎蚀变带中或闪长岩脉与灰岩地层的接触部位,北西向断裂构造是区内重要的控矿构造。围岩蚀变以绿泥石化、硅化、碳酸盐化、绢云母化、高岭土化、黄铁矿化、毒砂化等中-低温热液交代蚀变为主,该区成矿类型初步定为构造控制中-低温热液充填型金矿。综上,北部矿化带构造发育区,尤其是羽状构造破碎带,往往是金多金属的富集地段;南部矿化带灰岩与闪长岩脉成群区及其深部是找矿的有利地段,矿区具有较大的找矿空间及前景。因此,利用其蚀变结合构造,是寻找金及多金属矿的重要找矿方向。
Xichanggou gold mining area is located in the west end of the western Qinling orogenic belt, Magmatic-tectonic activity is strong and metallogenic geological conditions are superior. According to 1 : 2. 50000 stream sediment survey, we circled AS Ⅰand ASVI anomaly, through the comprehensive verification, and on the basis of the mineralized belt found the space position and mineralization characteristics of the mine area, the mining area was divided into south and north two mineralized belt. Three gold, gold,silver and lead silver mineralized bodies were found in the northern mineralized belt, 21 gold ore bodies were found on the surface of the southern ore belt. The gold ore bodies is mainly located in the fractured zone of cataclastic lithologic structure or the contact between the diorite vein and the limestone stratum, the NW fault structure is an important ore-controlling structure in the area. The surrounding rock alteration is mainly caused by mid-low temperature hydrothermal metasomatism, such as chlorolitization, silication, carbonation, sericite mineralization, kaolinite mineralization, pyrite mineralization and poisonous arenation, etc. The metallogenic type in this area is preliminarily designated as structural-controlled medium-low temperature hydrothermal filling gold deposit. From the above, the north mineralized zone, especially the pinnate fracture zone, is usually the gold and polymetallic zone. The group area of limestone and diorite veins in the southern mineralized zone and its deep part are the favorable areas for prospecting. Therefore, it is an important prospecting direction for gold and polymetallic ore to utilize its alteration combined structure.
Xichanggou gold mining area is located in the west end of the western Qinling orogenic belt, Magmatic-tectonic activity is strong and metallogenic geological conditions are superior. According to 1 : 2. 50000 stream sediment survey, we circled AS Ⅰand ASVI anomaly, through the comprehensive verification, and on the basis of the mineralized belt found the space position and mineralization characteristics of the mine area, the mining area was divided into south and north two mineralized belt. Three gold, gold,silver and lead silver mineralized bodies were found in the northern mineralized belt, 21 gold ore bodies were found on the surface of the southern ore belt. The gold ore bodies is mainly located in the fractured zone of cataclastic lithologic structure or the contact between the diorite vein and the limestone stratum, the NW fault structure is an important ore-controlling structure in the area. The surrounding rock alteration is mainly caused by mid-low temperature hydrothermal metasomatism, such as chlorolitization, silication, carbonation, sericite mineralization, kaolinite mineralization, pyrite mineralization and poisonous arenation, etc. The metallogenic type in this area is preliminarily designated as structural-controlled medium-low temperature hydrothermal filling gold deposit. From the above, the north mineralized zone, especially the pinnate fracture zone, is usually the gold and polymetallic zone. The group area of limestone and diorite veins in the southern mineralized zone and its deep part are the favorable areas for prospecting. Therefore, it is an important prospecting direction for gold and polymetallic ore to utilize its alteration combined structure.
引文
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董想平,杜占美.2010.青海省谢坑铜金矿地质特征及找矿方向[J].矿产与地质,24(01):70-73.
杜玉良,汤中立,蔡克勤,等.2003.秦岭-祁连造山带印支-燕山期构造与大型-超大型矿床的形成关系[J].矿床地质,22(1):65-71.
丰成友,李东生,吴正寿,等.2010.东昆仑祁漫塔格成矿带矿床类型、时空分布及多金属成矿作用[J].西北地质,43(4):10-17.
郭现轻,闫臻,王宗起,等.2011.西秦岭谢坑矽卡岩型铜金矿床地质特征与矿区岩浆岩年代学研究[J].岩石学报,27(12):3811-3822.
青海省地质矿产局.1991.青海省区域地质志[M].北京:地质出版社,52-574.
杨立朋.2008.青海省循化县谢坑铜金矿矽卡岩成因[D].中国地质大学(北京).
张辉.2013.青海同仁岗察岩体矽卡岩型多金属矿床流体特征[D].中国地质大学(北京).