辽西及其毗邻地区中生代盆地的构造类型和特征

STRUCTURAL TYPES AND CHARACTERISTICS OF MESOZOIC BASINS IN WESTERN LIAONING AND ITS ADJACENT AREAS

辽宁及其毗邻地区大地构造位置隶属于环太平洋构造带外带内陆区,该区分布有为数众多的中生代盆地,根据前晚三叠世基底出露情况,在该区划分出了61个中生代盆地,盆地的构造类型分为拗裂型、裂陷型、断陷型和断拗型4种类型,拗裂型盆地形成于晚三叠世一中侏罗世,又称早中生代盆地;断陷型和裂陷型盆地形成于晚侏罗世一早白垩世早期,又称晚中生代早期盆地;断拗型盆地形成于早白垩世晚期一晚白垩世,又称晚中生代晚期盆地,拗裂盆地与环太平洋深大断裂体系的热构造关系不明显,而与古板块构造的隆起和裂陷有关;裂陷和断陷盆地与环太平洋深大断裂体系的热构造密切相关,盆地严格受大兴安岭和下辽河-双辽两大热构造隆起带控制;断拗盆地与环太平洋弧后拉张的热体制有关。

The Western Liaoning and its adjacent areas, tectonically belonging to the inland area of the outer circum-Pacific tectonic belt, are developed with a lot of Mesozoic basins. According to the distribution of pre-Late Triassic basement, 61 basins are recognized. Based on their structural types, the basins are classified into four types, which are the depression-splitting basins, the splitting basins, the fault basins and the fault-depression basins. The depression-splitting basins were formed in Late Triassic-Middle Jurassic, and are therefore called the Early Mesozoic basins as well. The fault basins and^splitting basins, formed from Late Jurassic to the early stage of Early Cretaceous, are also called the early Late Mesozoic basins. The fault-depression type, known as the later Late Mesozoic basin, was formed between later Early Cretaceous and Late Cretaceous. The depression-splitting basins are related to the uplift and depression of paleoplate tectonics, but not to the thermal-tectonic system of the circum-Pacific deep-seated faults. The fault basins and splitting basins are closely related to the thermal-tectonic system of the circum-Pacific deep-seated faults, which strictly control the basins by the Daxinganling and Lower Liaohe-Shuangliao thermal-tectonic mole belts. The fault-depression type has a relation to the thermal-tectonic system located in the circum-Pacific rear-arc extension region.