古鄱阳湖陆相盆地沉积与物源相关性特征的研究  

Correlation between Source Rocks and Sedimentation of the Continental Basin of the Old Poyang Lake

作　　者：蔡雄飞[1] 章泽军[1] 顾延生[1] 

机构地区：[1]中国地质大学地球科学学院,湖北武汉430074

出　　处：《地球学报》2004年第3期327-330,共4页Acta Geoscientica Sinica

基　　金：1:5万区域地质调查项目 (项目编号 :2 0 0 0 13 0 0 0 0 2 0 5 1)H5 0E0 160 12 (田坂街幅 );H5 0E170 12 (游城幅 )资助

摘　　要：本文以古鄱阳湖东北缘陆相盆地与基底母岩物质来源为例 ,阐述陆相盆地源区的输送和盆地沉积过程存在的紧密相关性。这种相关性最直接的特征是基底母岩区的岩性往往直接控制了盆内沉积物的类型 ,可以说 ,有什么样的母岩成份和风化剥蚀的方式 ,就会在盆内形成什么样类型的沉积物。母岩的风化剥蚀作用始终是盆内沉积源源不断的物质来源 ,因而根据盆地陆源碎屑岩来自母岩的陆源碎屑组合可以推断源区的母岩类型。研究这种风化与沉积、剥蚀与堆积的相关性特征是陆相盆地供给和充填作用的一大特色。这种相关性研究的深入 ,不但大大提高地层划分的精度 ,而且也十分有助于陆相地层的广泛对比。尤其是成盆的早期和晚期的粗碎屑岩系的堆积尤为显著 ,这是因为粗碎屑岩系中的砾石 ,最能够直接反映母岩的性质 ,因而是判断母岩成份、基底抬升程度以及遭受风化剥蚀程度和方式等的标志。Exemplified by the sources of the basement parent rocks and the continental basin on the northeastern margin of the old Poyang Lake, this paper deals mainly with the close correlation between source transportation and deposition procedure of the basin. The close correlation indicates that the sources of basement parent rocks have always controlled the types of basin sediments, and that the deposition of parent rocks and the patterns of weathering and erosion have determined types of sediments. The weathering and erosion of parent rocks constitute the sources of sedimentation in the basin. An analysis of continental clastic composition of the clastic rocks may reveal the type of parent rocks in sources. Researches into correlation between weathering and deposition and between erosion and accumulation make up a distinguishing feature in the study of continental basin sedimentation, which can raise the precision of stratigraphic division and also contribute to regional correlation of continental strata. During the periodical development of the continental basin, the deposition of coarse clastic rocks takes place obviously at early and late stages of the continental basin. The gravels in coarse clastic rocks can directly indicate the type of parent rocks, because they serve well as the indicators of parent rock deposition, uplifting degree and weathering and erosion patterns. It is of key importance that the study on weathering and erosion of parent rocks should be related to the continental basin deposition.

关 键 词：沉积学 陆相盆地 物源 侏罗-白垩系 相关性 

分 类 号：P512.2[天文地球—地质学]