摘要
中、下扬子对冲带是扬子板块在秦岭-大别-苏鲁中央造山系和江南隆起南北向相向挤压作用下的必然结果。对中、下扬子对冲带的空间构造格局以及中、新生代的形成与解体的揭示有助于了解该对冲带的时空演化以及与南、北两大造山带的响应关系、郯庐断裂南端的性质以及区内海相油气的宏观勘探方向。研究认为中扬子对冲过渡带与下扬子对冲过渡带在印支-燕山早期基本同时形成,向西过渡到上扬子区以递进变形的方式稍晚定型。对冲带在燕山晚期以来遭受伸展作用的改造,逐渐解体和分异。郯庐断裂南端介于中、下扬子间,基于中、下扬子对冲带的完整性和连续性判断断裂南延可能性较小。中、下扬子对冲带是海相油气成藏的有利地区,是南方海相油气勘探潜在的领域之一,但对冲带不同段油气成藏具有较大的差异性和复杂性。
The formation of intra-continental ramp zone in middle and lower Yangtze region is a necessity for the conjunct compression from the Qinling-Dabie-Sulu central orogenic system and from the Jiangnan uplift, respectively. We demonstrate that the ramp zone in middle and lower Yangtze region formed during Indosinian-early Yanshanian cycle, essentially. Westward to the upper Yangtze region, the deformation process of the ramp zone is younger and younger by progressive evolution. During the late Yanshanian cycle, the extensional reactivation occurred in the middle and lower Yangtze region. The ramp zone was gradually disintegrated at the base of the pre-existing structures by the tectonic inversion. The intra-continental ramp zone is in favor of the marine hydrocarbon accumulation in middle and lower Yangtze region.
出处
《地质科技情报》
CAS
CSCD
北大核心
2008年第4期1-7,14,共8页
Geological Science and Technology Information
基金
中国石油化工集团重大科技攻关基础研究项目(2004KJ-01-324563)
国家“十五”重点科技攻关项目(2004CA3725-02)
中国地质大学(武汉)油气勘探开发理论与技术湖北省重点实验室和中国地质大学(武汉)构造与油气资源教育部重点实验室联合资助
关键词
中
下扬子区
对冲带
郯庐断裂
中
新生代
陆内变形
middle and lower Yangtze region
ramp zone
Tan-Lu fault
Mesozoic-Cenozoic
intra-continental deformation
