喬夏哈拉式鐵銅金礦成礦模式及其找礦意義(編輯修改稿)
2025-07-25 11:40 本頁面
【文章內(nèi)容簡介】 l of Qiaoxiahalatype mineral deposits in details.Key words: Qiaoxiahalatype, model of mineral deposits, minerogenetic series of mineral deposits, mineral deposit type1 IntroductionMinerogenetic series of mineral deposits presents a natural group of mineral deposits with genetic relationships formed at a certain geological period or a tectonic movement stage in a certain geological unit and a certain tectonic position under a certain mineralization (Chen Yuchuan et al., 2007). It is a brandnew natural classification of mineral deposits. Minerogenetic system includes five order classes of units: minerogenetic series association of mineral deposits and minerogenetic series type of mineral deposits。 minerogenetic series of mineral deposits。 minerogenetic subseries of mineral deposits。 mineral deposit type and mineral deposit (Chen Yuchuan et al., 2006). Mineral deposit is the basic unit at the fifth class, whereas mineral deposit type is one class higher than mineral deposit at the fourth. Each mineral deposit type can contain a describing pattern, minerogenetic pattern and prospectingevaluation model.2 Minerogenetic model of Qiaoxiahalatype FeCuAu depositsThe Qiaoxiahala FeCuAu deposit in Xinjiang is the typical one as Qiaoxiahalatype FeCuAu deposit. Taking it as an example, the main contents of this type can be concluded as following. Describing patternThe Qiaoxiahala FeCuAu deposit mainly produces magnetite and chalcopyrite hosted by basic marine volcanic rocks and the responding pyroclastic rocks with TFe at % and Cu at % at average and up to %. The No. III orebody in the eastern mining sector is with Cu at % at average and Au at , whereas No. I with Cu at .055% and Au at (Xinjiang Uygur Autonomous Region Geological Bureau, 1978). Magnetite orebodies mainly occurred in the western mining sector as the stratiformlike, phacoidal, lenticular, whereas chalcopyrite orebodies concentrated in the eastern mining sector labelled I~VII as stratiform and/or lenticular (Li Longqian, 2003). Ores included massive magnetite and chalcopyrite, banded epidote+magnetite, and disseminated pyrite+chalcopyrite+magnetite and chalcopyrite+magnetite. Ore structures appeared euhedral and subhedral granular, polygonal cleavage, anhdral granular and sheet texture.The Qiaoxiahala FeCuAu deposit located at the south side of the Ertix Fault at the margin of Altay Mountains hosted by Middle Devonian Beitashan Formation (D2b). The footwall rocks were basic volcanic rocks and pyroclastic rocks, whereas volcanic lava and the pyroclastic rocks were the hanging wall. Orebodies occurred as Fe174。FeCu174。CuAu from top to bottom vertically, responding to the stratified, banded and massive magnetite ore174。massive and disseminated Cubearing magnetite ore174。pact massive chalcopyrite ore. Alterations in the wall rocks developed well including epidotization, chloritization, carbonatization, sericitization, quartz, pyrite, tremolite et al (Ni Liang, 2004). Minerogenetic patternThe Qiaxiahala FeCuAu deposit was supposed to be formed by marine volcanicsedimentary mineralization enriched by
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