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东山岛位于福建省东南端的闽粤交界处,系区域性延伸的北东向断裂以及一系列北西向断裂互相切割所夹持的菱形块体。中生代以来,沿断裂的多次活动导致大规模变质活动及岩浆活动,地质作用以中生代断裂——变质——侵入活动强烈为突出特征。新构造期断裂仍较活跃,集中表现在对沿岸地貌景观、层状剥蚀形态及堆积形态的控制之上。 相似文献
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应用灰色系统理论对珠江三角洲地质环境质量分区评价 总被引：2，自引：0，他引：2
本文将灰色系统理论引用于珠江三角洲地质环境质量分区评价，建立了灰色系统数学模型，定量分区评价考虑了活动断裂、地震、坡度、地基承载力、场地地震效应、地下淡水资源、地下水埋深、水质污染、建材资源等因素，共９个指标。采用模型运算，得出相应的决策类别，将本区地质环境质量划分为良好、较好、较差、不良４个区１４个亚区。控制和影响环境质量优劣的主导因素是断裂的活动性及断块运动的差异性。软土地质灾害、淡水资源短缺 相似文献
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This paper discusses the origin and development of the Zhujiang Delta on the basis of the analyses of the fault systems, lithofacies, depositional thickness, ancient coastline and 14C dating. We consider that the delta is a multi-faulting block, whose external form, internal structure and configuration of its ancient coastline are all strictly controlled by three active sets of the NE, NW and WE faults. 相似文献
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This paper discusses level changes of the sea in the last 6000 years and the recent crustal movements of the coasts of the South China Sea. There was one transgression in the middle Holocene (about 6000-3000 years ago); the sea level might not be higher than the actual one. Many terraces and coral reef platforms above the sea level can be explained by recent crustal movements.As far as the intensity of the crustal movements are concerned, the NE faults are the strongest, the NW next, and the WE are the weakest. They intersect ia block-faulting, differing in seismic activity, crustal movement rate and amplitude. On the whole, they gradually become stronger from west to east in accordance with the increasing tendency of stress field.The land is tilting toward the sea, especially ia western Guangxi Province. 相似文献
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