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地球学报  2008 

西秦岭地区生物礁与铅锌矿关系的再认识

DOI: 10.3975/cagsb.2008.01.08

Keywords: 生物礁,铅锌矿,伴生关系,成矿机制,西秦岭

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Abstract:

本文以前人对西秦岭地区地层、岩相及有机地球化学研究成果为基础,结合补充的实际资料,论述了生物礁与西秦岭铅锌矿的伴生关系及其成因联系.地质建造上,规模矿床赋矿地层的共同特点是相对发育灰岩及生物灰岩;空间上,生物礁为沉积成矿洼地的障壁;层序上,沉积型铅锌矿和改造型铅锌矿与生物礁的伴生关系有所不同,前者一般赋存于生物灰岩或碎屑岩中,后者的矿体常赋存在生物灰岩与泥质岩的过渡部位,表现为礁硅岩套.与造礁生物有关的有机质可能在沉积成矿或改造成矿作用发生前的成岩过程中,参与了硫酸盐的热化学还原及铅、锌等多金属元素的萃取、运聚过程.板内伸展阶段的深源流体、陆内俯冲阶段的深源或岩浆热液注入先存的中低温富有机质卤水,分别导致了沉积和改造成矿作用发生.沿生长断裂发生的热水沉积成矿作用促进了处于低纬度地区的生物礁生长,并形成成矿洼地的障壁.生物礁在改造成矿过程中的作用主要在于形成利于改造成矿作用发生的成矿构造.

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