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地质学报  2009 

环渤海湾盆地寒武系混合沉积研究

, PP. 800-811

Keywords: 环渤海湾地区,寒武系,混合沉积

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Abstract:

内容提要:环渤海湾地区寒武系发育陆源碎屑与海相碳酸盐的混合沉积。综合前人研究成果,结合大量的区域地质资料、野外露头资料和钻井资料等,对环渤海湾地区寒武系混合沉积进行了详细的研究。研究结果表明:研究区混合沉积特征宏观上表现为由陆源碎屑与碳酸盐交互沉积、陆源碎屑与混积物交互沉积、碳酸盐与混积物交互沉积和混积物本身的交互沉积构成的混积层系,微观上表现为同一岩层内由陆源碎屑组分与碳酸盐组分混合沉积所形成混积岩;混合沉积类型有渐变式混合沉积、突变式混合沉积和复合式混合沉积Ⅰ,但是各种类型的混合沉积常相互叠加,频繁交替,形成类型复杂的混合沉积复合体;混合沉积环境为古陆边缘和陆表海,发育混积潮坪相、混积局限台地相和混积开阔台地相,微相类型有混积泥坪、混积灰坪、混积云坪、混积泻湖、混积浅滩和混积滩间等。最后结合混合沉积的成因、沉积机理、产出部位及沉积环境等因素,以沉积学原理为指导,建立了环渤海湾地区寒武系的混合沉积模式,进而对混合沉积的控制因素进行了讨论。

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