GEOCHEMISTRY AND GENESIS OF THE ARCHEAN BANDED FERROSILICON FORMATION IN FUSHUN, LIAONING PROVINCE
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摘要: 经过近几年对抚顺地区铁矿的勘查找矿工作,发现抚顺地区太古宙硅铁建造的矿石类型及地理分布,与横贯抚顺地区的浑河深大断裂存在某种特定的位置关系,这种关系具有普遍的规律性.作者在总结抚顺地区数个太古宙硅铁建造矿石特征的基础上,从分析多个硅铁建造矿床的地球化学特征入手,探讨其成矿的环境、过程,从而提出抚顺地区太古宙硅铁矿床的成矿模式,即海底火山喷气、热水-成矿流体洋底环流-沉积-变质重结晶的成矿模式.在中新太古代时期,浑河断裂作为当时的海底扩张带(或洋中脊),经过海底扩张作用,形成浑河裂谷.海底断裂附近频繁的火山活动,沿浑河断裂不断涌出的地下喷气、热水,萃取海底的拉斑玄武岩中的铁元素,形成富含铁、硅的热水溶液,这种热水溶液称之为成矿流体.成矿流体经过洋底环流作用,向两侧运移,在合适的环境下堆积成岩.该种岩石后来遭受区域变质作用和构造-岩浆热事件多重作用改造,发生变质重结晶成矿.Abstract: The ore types and distribution of the Archean ferrosilicon formation in Fushun region is specifically related to the trans-Fushun Hunhe deep fault. Based on the characteristic of the ores in the ferrosilicon formation, the authors analyze the geochemistry of a few deposits, with the metallogenic background and process, to set up the ore-forming model of the Archean ferrosilicon formation in the region, i.e. the model of submarine volcanic exhalation/hot water-ore fluid submarine circulation-sedimentation-metamorphic recrystallization.
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Key words:
- Archean /
- banded ferrosilicon formation /
- Hunhe fault /
- ore-forming model /
- Fushun, Liaoning Province
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