南盘江盆地晚二叠世-早三叠世三叉裂谷系统的厘定

南盘江盆地因其特殊的大地构造背景,历来是国内外学者关注的焦点,在晚海西-印支期经历了复杂的构造演化过程,在地层中留下了丰富的可直接反映沉积盆地形成、演化和岩石圈动力特征的沉积作用、构造作用、岩浆活动和成矿作用过程的地质记录,成为探索古大陆边缘地质、认识和揭示环太平洋构造域和特提斯构造域关系的关键地区之一。"三叉"裂谷系统是指:在巨大的岩石圈穹窿上沿大致成120°交角的三支三叉裂谷系统的演化辐射状破裂发育形成的裂谷系。南盘江盆地三叉裂谷系统的北支为走向南北的乐运-乐园裂谷,另外两条是:其中向西的一条裂谷走向近东西向,经隆林县城南部向西逐渐转变为北东-南西向;向东的一条走向主要为南东-北西,主要沿田林-百色断裂向南东延伸。

Determination of three armed rift system of Late Permian-Early Triassic in Nanpanjiang Basin

For the complex structural background of Nanpan river basin, it always be the focus point of researchers of home and abroad. It experienced a complex structural evolution process in late Hercynian-Indo period, abundant geological records left in the strata, these records can reflect the sediment and evolution of sedimentary basin, deposition, tectonism, magmation activity and mineralization process of lithosphere dynamic features, so it becomes one of the key areas to explore ancient continental margin geology, discover and reveal the relation of circum pacific tectonic region and ethys tectonic domian. The three armed rift system means: On the huge lithosphere fornix along a roughly 120 ° angle of three trigeminal evolution of rift system radial fracture development form the rift system. The north branch of the three armed rift system in the Nanpanjiang basin is the north-south Leyun-Leyuan rift. The eastward trend is mainly from the southeast to the northwest, and the fault extends from the Tianlin-Baise fault to the southeast.