甘肃酒泉Q_(y1)钻孔磁性地层划分与对比

甘肃第四纪地质研究取得了丰硕成果，但因各家对第四纪地层划分的原则和依据不统一及其他原因，致使第四纪划分的一些基本问题尚无统一意见。为建立河西走廊地层层序，本文依据酒泉Ｑｙ１钻孔磁性地层特征、热释光测试成果、１４Ｃ资料及岩石地层特征进行地层划分。依据区域地质资料和古地磁成果，确定第四纪下限为２．４８Ｍａ，中更新世下限为０．７３Ｍａ，晚更新世下限为０．２０Ｍａ，全新世下限为０．０１２Ｍａ。

The magnetostratigraphy of the Q y1 Drill Hole of Jiuquan, Gansu

There have been great advances in the researches of Quaternary geology, but owing to the different principles and bases used by scholars for the division of the Quaternary strata and also owing others reasons, there have not yet been unified opinions on some basic problems concerning the division of the Quaternary strata. In order to set up stratigraphic succession of the Hexi Corridor, a stratigraphic division has been made on the basis of the characters of magnetostratigraphy of the Q y1 Drill Hole of Jiuquan, the achievement of test of heat releasing light, the data on 14 C and the characters of litho stratigraphy. Based on the data on regional geology and palaeomagnetic achievement, the lower limit of the Quaternary is dated to be 2.48Ma B.P., the lower limit of the middle Pleistocene to be 0.73Ma B.P., the lower limit of the late Pleistocene to be 0.2Ma B.P., and the lower limit of the Holocene to be 0.012Ma B.P..