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地球学报  2009 

庐江-枞阳矿集区深部结构与成矿

DOI: 10.3975/cagsb.2009.03.01

Keywords: 庐江?枞阳矿集区,深部结构,高分辨率地震反射,应力场,构造演化

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Abstract:

为探测长江中下游成矿带庐江?枞阳白垩纪火山岩盆地和铁、硫矿集区深部构造和地壳结构,探讨成矿深部控制条件,作者完成了穿越火山岩盆地的深反射地震剖面(记录30s)和罗河铁矿区浅层高分辨反射地震剖面,揭示了矿集区全地壳精细结构,同时开展区域构造测量和应力场反演研究,获得了新的认识。证实“耳状”的庐?枞火山岩盆地是一个沿北东向罗河断裂向东发育的非对称火山盆地,排除了另一半被断在西侧红层之下的判断;罗河断裂是一条切穿MOHO的深断裂,倾向南东,是引导地幔流体和岩浆上涌和喷发的通道;鉴别出多层界面,火山岩?侏罗系砂岩厚约4?5km(其中火山岩厚度约3km),三叠系?震旦系变形层底界深度大致18?20km,变质基底组成中下地壳,MOHO平缓向西北倾,深度33?31km;追踪郯?庐断裂带的深部产状,陡立延伸到MOHO,宽约10km。

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