中上扬子海相层系埋藏史与构造运动的关系

依据复杂岩性条件下孔隙度—深度关系模型,采用回剥法重建埋藏史。结果表明,中上扬子地区的埋藏史可分为3种主要类型:早抬持续型、早抬再降型和晚抬持续型。埋藏史的类型受区域构造运动控制,具有明显的分带性。齐岳山断裂以西为晚抬持续型,齐岳山断裂与黄陵隆起之间为早抬持续型,黄陵隆起以东为早抬再降型。印支运动在中上扬子地区只对海相层系有一次短暂抬升剥蚀,剥蚀量小,对埋藏史特征影响不大。燕山运动表现形式、作用强度、对海相层系的改造程度均存在明显的地区差异性,导致海相层系埋藏史类型也有地区差异性。喜马拉雅运动波及整个中国南方,但岩石圈受力性质不同,表现为西挤东张,导致K_2—E期间黄陵隆起以西持续抬升,形成"持续抬升型"埋藏史类型,以东则发生拉张断陷,形成"再降型"埋藏史类型。

The relationship between burial history of marine strata and tectonic movements in Mid-Upper Yangtze area

The burial history of the marine strata in the Mid Upper Yangtze area is reconstructed by back stripping method based on the porosity depth model under complicated lithologic character. The results show that the burial history can be divided into three types，namely，early uplift hold，early uplift subsided and late uplift hold. The regional tectonic movements controlled the burial history types which characterized by obvious zonation. The burial history types western of Qiyueshan fault belong to the late uplift hold； those between Qiyueshan fault and Huangling uplift，are the early uplift hold； those eastern of Huangling uplift，are the early uplift subsided. The Indosinian movement resulted in a short duration of uplifting with slight erosion in the Mid Upper Yangtze area and therefore significantly change of burial history was not occurred. The Yanshanian movement is the key tectonic event which influenced the burial history sorts. The differences in burial history type mainly came from the contribution of the Yanshanian movement. The Himalayan movement spread to the whole Southern China，while the lithosphere was extruded in west of Huangling uplift but extended in east of Huangling uplift. Therefore，the burial history type western of Huangling uplift is the early or late uplift hold，and those eastern Huangling uplift are the early uplift subsided.