| 摘要: |
盆地和造山带之间的关系是当前大陆动力学探索的热门和前沿思想的生长点。大陆构造上最突出的和最基本的构造单元,一是盆地系统,二是造山带系统。这两个系统是地壳时空演化的一对孪生体。
沉积盆地系统是把堆积空间和各类物源区作为一个有机的整体体系。盆地是地壳构造运动的产物,是地球动力学的响应,而盆地的发生和发展又与造山带是相辅相成的。盆地的性质、类型、演化和盆地性质转换的动力学分析,通过火山岩的性质、蛇绿岩和混染堆积或者是岛弧带的走向等判断,这些信息无疑是重要的因素。沉积地质学的发展所赋予新的研究内容是:通过不同物源堆积体的相互关系可以反馈盆地地球动力学性质和盆山转换的信息,盆地边界的构造要素、不同物源的充填堆积物的生长序列、堆积物的几何形态及其叠置关系等也具有与蛇绿岩同等的重要性。
造山带是地壳构造活动和动力转换的记录,它代表陆块间的相互运动、消失的大洋、消失的陆块和大陆边缘盆地,所以造山带就是消失的大洋系统和消失的盆地系统,即盆地转为山系。这种"盆山转换"的耦合关系是当代沉积地质学和大地构造学交叉的前沿。本文提出"盆山转换"的新思路和研究的内涵。并讨论这一理论、方法的基本观点和思路:"板块构造控盆、盆转山和山控盆"。 |
| 关键词: 盆山转换 盆地分析 动力学在盆地中的响应 |
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| CURRENT ASPECTS OF BASIN-MOUNTAIN TRANSFORMATION AND BASIN ANALYSIS |
| Xu Xiaosong, Xu Qiang |
| (Chengdu Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences) |
| Abstract: |
Much research of continental dynamics has focused in recent years on the relationship between the basin system and orogenic system which are interpreted as two basic and essential tectonic units and twins in the temporal and spatial evolution of.the crust.
The sedimentary basin system is a whole organic system of accumulation spaces and provenances.A basin is the product of the crustal movements in response to geodynamics. The formation and development of the basins,in turn,are closely bound up with those of the orogenic zones.The basin analysis including basin nature,type,evolution and dynamics of basin nature transformation is conduced on the basis of the features of volcanic rocks, and strikes of ophiolites and melanges,and/or island-arc zones.Furthermore,the interrelations among the sedimentary bodies of distinct provenances may feedback the information about the geodynamics and basin-mountain transformation.The structural elements of the basin boundaries,growth sequences of the filling deposits from different source areas,and geometry and stacking patterns of the deposits have the same important implications as the ophiolites as well.
The orogenic zones record the crustal tectonism and dynamic transformation,and represent intercontinental movements,extinct oceans and landmasses,and epicontinental basins.In other words,the orogenic zones were originated from the basin systems,and represent the extinct oceanic systems and basin systems,In this paper,the authors have proposed the new knowledge of "basin-mountain transformation",and offered some thoughts on "plate tectonics controlling basins,basins transforming into mountains,and mountains controlling basins". |
| Key words: basin-mountain transformation basin analysis dynamic response in basins |
