松辽盆地东南隆起区反转构造对砂岩型铀矿成矿的作用

松辽盆地东南隆起区嫩江组沉积期末形成了大量的正反转构造,主要发育断陷和坳陷层序反转背斜型、断陷层序中断层下正上逆型、坳陷层序中断层上下皆逆型、断陷层序中断层上下皆逆型4种样式.构造反转改变浅部坳陷层的构造形态、物理性能、地下水的循环方式和岩石地球化学性质,导致深部油气和CO2向上运移,有利于形成砂岩型铀矿床.因此,盆地东南部找铀矿应注重由反转构造形成的剥蚀天窗地区.

Inversion structure and its contribution to sandstone uranium metallogenesis in southeast uplifted domain of Songliao basin

Many positive inversion structures were developed during the end of Nenjiang period in southeast Songliao basin Main styles of inversion structures are inversion anticline in downfaulted and depression sequence, positive footwall and negative upthrown block in downfaulted sequence, negative footwall and upthrown block in downfaulted sequence, negative footwall and upthrown block in depression sequence. Structure inversions may contribute to sandstone uranium ore-formation because they changed the structure shape, physical properties, circulating way of groundwater, geochemical property of rocks in shallow depression layer of the basin and lead to the ascending migration of oil-gas, CO2. Thus, denudation window areas are favorable for sandstone uranium ore-formation and attention must be paid to denudation window areas in Southeast uplifted domain of Songliao basin.