鄂皖边界扬子板块前陆盆地的A型俯冲

鄂皖边界大别南缘主俯冲边界断层的存在以及扬子板块前陆盆地盖层大型薄皮构造，揭示扬子板块向大别山造山带之下的Ａ型俯冲，纵向上构造类型的不同，板片的局部相楔及横向断层的存在，反映Ａ型俯冲的不均一性。Ａ型俯冲始自中三叠世末，处续到渐新世初，持续了约１８０Ｍａ，主构造期为中三叠世末，薄皮构造带前锋望江盆地是寻找油气的远景地区。

A-Type Subduction of the Yangtze Plate Foreland Basin of in Anhui and Hubei Province Boundary

The main A-type subduction fault and large scale thin-skinned tectonics clearly reveal that the Yangtze Plate subsides towards Dabie orogenic belt. The longitudinal difference of structure types,wedging and the lateral faults indicate the disuniformities of the A--type subduction. From the middle Triassic to the early Oligocene,the A-type subduction lasted about 180 ma and major tectonic stage is the middle Triassic. In the lower Yangtze region,there exist good oil generating,bearing and covering bed assemblages in the marine strata. The research area especially Wangjiang basin is favourable for the prospect of trap structures. Moreover,the weak magmatic activity of the foreland makes the thin-skinned structures one of ideal oil and gas' exploration area in the lower Yangtze region with strong and extensive magmatic activities.