摘要
西藏羌塘盆地东部中侏罗统广泛发育陆源碎屑与碳酸盐的混合沉积。综合前人研究成果,结合区域地质资料和室内样品分析,对混积岩、混积层系、陆源碎屑岩、碳酸盐岩、混合沉积环境进行了详细的研究。结果表明,研究区中侏罗统混合沉积在微观上表现为陆源碎屑与碳酸盐沉积物组分的混积岩,宏观上则表现为陆源碎屑岩、碳酸盐岩、混积岩相互叠加的混积层系,发育滨岸、碳酸盐岩缓坡、潮坪-潟湖3类沉积体系,在此基础上以沉积学原理为指导建立了中侏罗统雀莫错组、布曲组和夏里组的混合沉积模式。
The mixed siliciclastics and carbonate sedimentary system is developed extensively in eastern Qiangtang basin.Based on previous research results,the authors studied the diamictite and diamictic system,terrigenous clastic rock and carbonate rock by means of regional geological material analysis and inner sample analysis.The results show that the study area is characterized by interactive sediments of terrigenous clastic rock and carbonate rock at the microscopic level,called ＂mixed rock＂,and that in the macroscopic performance there exists the mixed sequence composed of terrigenous clastic rock,carbonate rock and mixed rock.Mixed sedimentation resulted from facies mixing with minor source mixing and event mutation,which formed the sedimentary system of shore,carbonate gentle slope and tidal flat-lagoon.Combined with the tectonic setting and guided by the sedimentary principles,this paper proposes a mixed sedimentation model for the eastern part of the Qiangtang basin in Tibet.
出处
《中国地质》
CAS
CSCD
北大核心
2012年第2期390-399,共10页
Geology in China
基金
国家自然科学基金项目(40172014)
青藏高原1:25万仓来拉幅区域调查项目(I46C004003)
南亚地区基础地质图件编制与成矿地质背景研究(1212011120333)共同资助
关键词
中侏罗统
混合沉积体系
羌塘盆地
西藏
middle Jurassic
mixed sedimentary system
Qiangtang basin
Tibet
