苏鲁豫皖早第三纪构造与含盐盆地分布规律

中国东部苏鲁豫皖早第三纪构造属喜马拉雅构造阶段的一个构造分阶段,其构造格局是古新世—渐新世地壳块断运动的产物。可将其划分为四级:凸起与凹陷;隆起与坳陷;隆起带与坳陷带;隆起区与坳陷区。进而把区内早第三纪构造区划分为3个一级构造单元,8个二级构造单元,25个三级构造单元和163个四级构造单元。为阐明油气和盐类矿产分布规律,早第三纪盆地应与该时期四级构造单元的负向构造——凹陷对应。盆地分类主要因素为:古地貌特征(盆岭结构)和岩相特征(单相带与多相带),据此将早第三纪盆地分为四种类型——盆岭式(以岭为主)单相带盆地;盆岭式(以岭为主)多相带盆地;岭盆式(以盆为主)单相带盆地;岭盆式(以盆为主)多相带盆地。依据上述研究结果认为:本区早第三纪成盐期盐类矿产的形成和分布与盆岭式多相带类型的盆地密切相关。以河南舞阳早第三纪盆地为典型,进一步阐明了盆岭式多相带盆地与早第三纪成盐期盐类矿产形成的内在联系。

DISTRIBUTIONS OF EOGENE STRUCTURES AND SALT-BEARING BASINS IN JIANGSU,SHANDONG,HENAN AND ANHUI PROVINCES

The Eogene structures are developed at a substage of the Himalayantectonization in Jiangsu,Shandong,Henan and Anhui provinces,owing theirgenesises,according to their structural layouts,to the crustal fault-block tectonism ofthe paleocene-Oligocene period.Such structural layouts may have themselvesclassified into protrude plus hollow,uplift plus depression,uplift belt plus depressionbelt,and uplift zone plus drepression zone,all included in three first-order tectonicunits,eight second-order tectonic units,25 third-order tectonic unidts and 163fourth-order tectonic units.The Eogene basins should be related only to thedepressional stuctures of the fourth-order tectonic units before strong light can beshed on the distributions of such mineral resources as oil,gas and salt.Division ofthe Eogene basins gives much emphasis on geomorphologic features,basin-range typeor range-basin type,and on lithofacies features,single facies belt or multi-faciesbelt,finally into basin-range type(mainly range)single facies belt basin,basin-range type(mainly range)multi-facies belt basin,range-basin type(minly basin)single facies belt basin,and range-basin type(mainly basin)multi-facies belt basin.A large amount of studies suggests the Eogene salt mineral resources had a closelink in genesis with the basin-range type multi-facies belt basins which controlledtheir formations and distributions.The Eogene Wuyang basin in Henan province is atypical exsample where there is a innate relation between basin-range type multi-facies basins and salt mineral reaources.