| 张玉成.甘肃小柳沟式钨钼矿床成矿模式探讨[J].矿产勘查,2019,(9):2243-2255 |
| 甘肃小柳沟式钨钼矿床成矿模式探讨 |
| Discussion on the mineral deposit model of the Xiaoliugou W-Mo deposit in Gansu Province |
| 投稿时间：2018-06-26 |
| DOI： |
| 中文关键词: 钨钼矿床 矿床成因 成矿模式 找矿方向 小柳沟 甘肃 |
| 英文关键词: W-Mo deposit, deposit genesis, mineralization model, prospecting direction,Xiaoliugou,Gansu |
| 基金项目:中国地质调查局项目(编号:1212011085084)资助。 |
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| 中文摘要: |
| 小柳沟钨钼多金属矿床位于北祁连加里东造山带西段。通过深入研究小柳沟矿集区典型矿床地质背景及矿床地球化学特征,认为矿床的产出受地层、构造和岩浆岩等因素的综合控制。成矿物质W主要来自地层,部分来自岩浆,岩浆作用的热动力驱动、虹吸作用及流体交代作用是W进入岩浆的主要原因；Mo主要来自壳内S型花岗岩,同时受到深部岩浆的供应；硫主要来自岩浆热液,在近地表石英硫化物阶段硫可能受到地层或地壳重熔花岗岩和大气地表水中硫的混合作用；成矿流体主要来自岩浆热液,在晚期有大气降水的混合。矿床成矿年龄集中在392～428 Ma之间,二长花岗岩成岩年龄为454 Ma左右,花岗闪长岩形成时代为418 Ma左右,二长花岗岩成岩与矿体成矿时差相差40 Ma左右,该时差超过一般岩体冷却所需要的时间,结合构造演化认为成矿与挤压向伸展转换阶段的构造减压密切相关,有部分成矿年龄落入海西期和燕山期,认为成矿后期经历了海西期和燕山期岩浆热事件的改造。根据矿床成因建立了小柳沟矿集区成矿模式,并对进一步找矿方向提出了建议。 |
| 英文摘要: |
| Xiaoliugou W-Mo polymetallic deposit located in Caledonian orogenic belt on the west part of the Northern Qilian Mountains. Through in-depth study of typical deposit geological setting and geochemical characteristics in Xiaoliugou Ore Concentrated Area. Studies show that the output of deposit is integratedly controled by stratigraphy, tectonics and igneous rocks factors. The ore-forming materials of W are derived mostly from the formation, part from the magma.;Thermal power drive from magmatism, siphon action and fluid metasomatism is the main reason that W enter the magma. Mo mainly from the crust S-type granites, while being supplied by deep magma. Sulfur mainly from magmatic hydrothermal, and sulfur may be mixed by formations ,crust remelting granite or atmospheric surface water in the quartz sulfide phase in near surface. The ore-forming fluids Mainly from magmatic hydrothermal and were mixed by atmospheric precipitation in the late stage. The mineralization age of Xiaoliugou W-Mo polymetallic deposit is from 392 Ma to 428 Ma, and rock-forming age of adamellite and granodiorite is about 454 Ma, the granodiorite is about 428 Ma; The time difference over the time that is generally required for cooling of rock. Combined with tectonic evolution inferred that metallogenic is closely related to decompression in conversion stage from extrusion to stretch of the structure.At the same time, some metallogenic ages fall in Hercynian and Yanshanian,so believe metallogenic have experienced transformation of magmatic heat events in Hercynian and Yanshanian. Finally,according to the genesis of deposit established the metallogenic model of Xiaoliugou Ore Concentrated Area, and made recommendations for further prospecting direction. |
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