白永俊.辽东裂谷菱镁矿的成矿环境、分布规律及矿床成因[J].地质找矿论丛,2020,35(2):161-167
辽东裂谷菱镁矿的成矿环境、分布规律及矿床成因
Metallogenic enviroment, distribution pattern and genesis of magnesite ore in Liaodong Rift
投稿时间:2019-09-09  修订日期:2020-01-11
DOI:10.6053/j.issn.1001-1412.2020.02.005
中文关键词:  菱镁矿床  辽东裂谷  成矿环境  矿床分布规律  矿床成因  辽宁省
英文关键词:magnesite deposit  Liaodong Rift  metalogenic environment  distribution pattern of magnesite deposit  genesis  Liaoning province
基金项目:
作者单位
白永俊 辽宁省冶金地质勘查研究院有限责任公司, 辽宁 鞍山 114038 
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中文摘要:
      辽东裂谷为古元古代拉伸环境下产生的EW向陆内裂谷,裂谷的北缘斜坡带赋存有大石桥—塔子岭超大型菱镁矿带,中央裂陷带赋存了瓦峪—青城子大型菱镁矿带。菱镁矿床的产出与成矿物质来源的位置有较大的关系,同时与沉积的环境因素、后期的各种扰动因素有关。在古元古代富含CO2的环境中,源于太古宙地块剥蚀物中和远源火山喷发物中的镁质进入海水,在持续稳定的陆缘潮间-潟湖蒸发环境中,在藻类生物吸附吸附作用的有力辅助下,沉积了巨厚的富镁碳酸盐岩,经过成岩作用形成原生菱镁矿层。在区域变质-变形过程中,原生菱镁矿层经过褶皱变形和矿物重结晶,完成形态方面的最终定型;因此,辽东裂谷菱镁矿属于沉积-变质型矿床。
英文摘要:
      Liaodong Rift is a intra-continent rift formed under stretching enviroment in Proteroic Era. In the northern slope of the rift occurs the Dashiqiao-Taziling magnesite ore belt and in the central rift the large Wayu-Qingchengzi magnesite ore belt. Occurrence of the magnesite ore is generally related to location of the ore material source, also the sedimentary environment and various late disturb factors. Under CO2-rich environment in Proteroic Era magnesian materials from the eroded materials of Achean terrain and distal erupted materials get into sea water. With help of algae absorption huge thick Mg-rich carbonate rock precipitated under continuous stable intertidal-lagoon evaperation condition at continental margin. During diagenesis is formed the primary magnesite ore layer which was recrystalized and took the final shape in the process of regional metamorphism and deformation. The magnesite deposit in Liaodong Rift belongs to sedimentary-metamorphic deposit.
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