| 金川硫化铜镍矿床成矿模式 |
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| 引用本文： | 汤中立.金川硫化铜镍矿床成矿模式[J].现代地质,1990,4(4):55-64. |
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| 作者姓名： | 汤中立 |
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| 作者单位： | 甘肃省地质矿产局 |
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| 摘 要： | 金川矿床产出于过渡区,位于中朝地块西南部阿拉善边缘隆起上,含矿岩体是多期上侵贯入形成的,时代为1509～1526Ma。 导源于地幔深郎富硫的铁质超基性岩浆,沿超壳深断裂上侵到达地壳岩浆房。注入岩浆房的岩浆在橄榄石结晶温度的区间内,发生熔离作用和橄榄石结晶作用,按重力效应正岩浆房中自下而上先后形成了矿浆、富矿岩浆、含矿岩浆和岩浆的分层格局。随着温度下降,在构造应力脉动式驱动下,岩浆房中自上而下按岩浆、含矿岩浆、富矿岩浆和矿浆的顺序,先后分别沿相同通道上侵、贯入于现存空间成岩成矿、每次上侵、贯入的浆体都沿着前次浆体的下侧部和根部定位。 整个成矿过程由岩浆房中的深部熔离、橄榄石结晶和重力分层作用→第一期次岩浆上侵→第二期次含矿岩浆上侵→第三期次富矿岩浆贯入→晚期矿浆贯入→接触交代成矿→热液叠加成矿,构成一个完整的硫化铜、镍矿床的成矿模式和时空分布系列。
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| 关 键 词： | 过渡区 深部熔离 多期次上浸贯入 热液叠加 成矿模式 |
MINEROGENETIC MODEL OF THE JINCHUAN COPPER AND NICKEL SULFIDE DEPOSIT |
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| Tang Zhongli.MINEROGENETIC MODEL OF THE JINCHUAN COPPER AND NICKEL SULFIDE DEPOSIT[J].Geoscience——Journal of Graduate School,China University of Geosciences,1990,4(4):55-64. |
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| Authors: | Tang Zhongli |
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| Institution: | Geology and Mineral Resources Bureau of Gansu Province |
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| Abstract: | The Jinchuan deposit occurs in transitional regions. It is located in the Alashan uplift belt on the southwestern margin of the Sino-Korean landmass. The ore-bearing rock bo dies have been formed by intrusions and injections of magmas for many times. Its isotopic ages is 1509-1526 Ma.
The sulfur-rich ferruginous ultrabasic magma derived from the deep-seated mantle was intruded in the magma chamber of the deep levels of the crust along the ultracrustal fault. The magma underwent liquid unmixing and olivine crystalization in the magma druubcr between th?liquidus line temperature and the solidus line temperature. Due to gravity effect, the early separated liquid (unmixed sulphide melt) was then localized in the lower part, while the later separated liquid (unmixed sulfide melt) together with the crystallized divine were localized in the upper part, forming the stratified sulfide ore ii'.uima, sulfide rich magma, sulfide bearing magma and silicate magma upward in the m.igm.i chamber. As the temperature fell down, in process of the normal stress, these four types of magma ascended separately and successively along the same channelway downward, and finally were consolidated at the present place. In every time, the injected and in-t: tided magma was emplaced on the lower side or on the roof of the former magma bo dies. The good growth of the sulfide rich and crystal olivine bearing magma and its orebody forming injection indicate the main metallogenetic stage and minerogenetic climax stape.
The whole metallogenetic processes: deep seated magmatic liquid unmixing, crystalization of olivines and stratified action by gravity--the first stage silicate magma as Lending the second stage sulfide bearing magma ascending "the third stage sulfide rich magma injecting Hate sulfide ore magma injecting "metasomatic minerogenesis by contact superimposed hydatogenesis, constitute an integrated menerogenetic model of copper nickle sulfide deposit and also a series of the temporal and spatial distribution. |
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| Keywords: | :transition regions deep steated magmatic liquid unmixing intrusionand injection for many times hydatogenesis superposition minerogenetic model |
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