【作者】 王家豪； 陈红汉； 王华； 赵忠新； 严德天；

【Author】 WANG Jia-hao, CHEN Hong-han, WANG Hua, ZHAO Zhong-xin, YAN De-tian (Faculty of Earth Resources, China University of Geogsciences, Wuhan 430074, China)

【机构】 中国地质大学资源学院；

【摘要】 根据详细的露头实测资料,库车前陆盆地北部古近系主要发育扇三角洲体系与滨浅湖相-浅湖相交替沉积, 可识别为1个一级层序、2个二级层序和8个三级层序。库姆格列木组二级层序包括6个三级层序,其上部层序在KZ露头以东地区大量缺失以及KZ露头发育指示逆冲推覆活动的楔状砾质粗碎屑沉积体,反映了该二级层序发育于构造活动期;苏维依组二级层序包括2个三级层序,其三级层序在北部露头区厚度、沉积演化相近,表现为构造宁静期的层序特点。三级层序的低位体系域普遍为泥石流发育的扇三角洲体系沉积,层序结构具有经典层序地层学理论I型层序的特点,推断三级层序主要受控于湖(海)平面变化而具有广泛可对比性,如古近纪早期的短暂海侵成因。更多还原

【Abstract】 Based on outcrop survey on detail, the Paleogene in north-eastern Kuqa foreland basin, in which the fan delta depositional system and offshore-shallow lake depositional system alternatively developed, could be divided into a first-order sequence, two second-order sequences and eight third-order sequences. According to severe stratal absence to the east of outcrop KZ and the coarse wedge-shaped amalgamated sediment indicating thrusting at outcrop KZ, the Kumugeliemu Formation, as a second-order sequence containing six third-order sequences, developed during the thrusting. The Suweiyi Formation, as the other second-order sequence containing two third-order sequences, whose thickness and deposition evolution at outcrop KZ were very similar to that at other outcrops, developed during the quiescence. Almost all third-order sequences, whose low-stand system tracts were typically comprised of debris flow deposition of fan delta plain, were similar to the type-I sequence described in sequence stratigraphy theory. The third-order sequences were presumed to be resulted from lake- or sea-level change such as the short-termed transgression in the early Paleogene, so they should widely be correlative.更多还原