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对珠江三角洲地区布格重力资料系统处理、研究、解释,确认珠江三角洲地区地壳深部存在近EW向、NW向、NE向三组断裂。近EW向断裂是深部主要断裂,大部分断裂深及30km以上,其中有些断裂是以往很少为人们关注的。NW向断裂分布也比较广泛,但深度相对较浅,大都在10km左右,不超过20km。NE向断裂虽然地表出露最广,规模最大,但只有广州—恩平断裂可深及30km以上,大多数也相对较浅,特别是以往一些被称为深大断裂的只有10km左右深度,不超过20km。上述工作新成果同传统概念的珠江三角洲地区深大断裂格局有较大改变。本文提出“新构造期深大断裂”的新概念和理论来解释这种格局的改变。
The Bouguer gravity data system in the Pearl River Delta region was processed, studied and interpreted to confirm the existence of nearly EW, NW and NE fractures in the deep crust of the Pearl River Delta. Near-EW trending fractures are deep major fractures, most of which are deeper than 30km deep and some of them were rarely previously concerned. NW fracture distribution is also more extensive, but the depth is relatively shallow, mostly in about 10km, not more than 20km. Although the NE-trending faults are the most exposed and the largest in scale, only the Guangzhou-Enping fault can be deeper than 30km and most of them are relatively shallow. In particular, some fractures known as deep faults have only a depth of about 10km, More than 20km. The new results of the above work have greatly changed from the traditional deep-sea fault pattern in the Pearl River Delta. This paper proposes a new concept and theory of “deep fault of new tectonic period” to explain the change of this pattern.