Stratigraphic division of Neogene Gansu Group in Wuwei Basin, northeastern margin of Qilian Mountains
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摘要:
祁连山东北缘武威盆地发育一套灰白色-砖红色砂质细砾岩、含砾粗砂岩、泥质粉砂岩。已有的区域地质调查通过区域地层对比，将其确定为新近系甘肃群。在1:5万区域地质调查中，通过详细的钻孔地层剖面和地表地层剖面测量，结合钻孔古地磁年代学分析，依据甘肃群岩性特征与沉积环境分析，将甘肃群划分为上、下2个组，分别命名为果园组和丰乐组。丰乐组为桔黄色-砖红色砂质细砾岩、泥质粉砂岩、泥岩夹灰白色长石石英砂岩，为早—中中新世扇三角洲-滨浅湖相沉积(11.18~8.25 Ma)。果园组为土黄色粉砂质泥岩，砖红色中—粗粒砾岩，为河流相沉积, 与下伏丰乐组呈平行不整合接触，向上与下更新统玉门砾岩呈角度不整合接触，沉积时代为晚中新世—上新世(8.25~2.58 Ma)。武威盆地甘肃群丰乐组和果园组2个正式岩石地层单位，在区域上可与邻区新近纪地层对比，统一了青藏高原东北缘的新近纪地层系统，为青藏高原东北缘新生代地质研究提供了地层学依据。
Abstract:A set of grayish-white, brick-red sandy fine-grained conglomerate, conglomerate-bearing coarse-grained sandstone is developed in Wuwei Basin, northeastern margin of Qilian Mountains, which was confirmed as Neogene Gansu Group by regional geological survey and stratigraphic correlation.The Gansu Group was divided into upper and lower formations here, named Guoyuan Formation and Fengle Formation, respectively, based on the borehole and surface stratigraphic sections, borehole paleomagnetic chronology, lithologic characteristics and sedimentary environment analysis of Gansu Group.The Fengle Formation is characterized by Early-Middle Miocene fan delta-lacustrine sediments consisting of orange-yellow sandy fine-grained conglomerate, muddy siltstone, mudstone intercalated with grayish-white feldspathic quartz sandstone, with the paleomagnetic age of ca.11.18~8.25 Ma.The Guoyuan Formation represents fluvial sediments, composed of yellowish silty mudstone and brick red medium-coarse-grained conglomerate.Its lower boundary is in parallel unconformity contact with the Fengle Formation, and the top boundary is in angle unconformity contact with the Lower Pleistocene Yumen conglomerate.Its sedimentary age is Late Miocene to Pliocene (8.25~2.58 Ma) as paleomagnetic dating.Therefore, the Fengle Formation and Guoyuan Formation of Gansu Group in Wuwei Basin are two formal lithostratigraphic units, which can be regionally correlated with the Neogene stratigraphy in the adjacent areas, and unify the Neogene stratigraphy system in the northeastern margin of the Tibetan Plateau, providing the stratigraphy basis for the Cenozoic geology in the northeastern margin of the Tibetan Plateau.
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表 1 甘肃群划分沿革表
Table 1. Evolution of Gansu Group division
杨钟健等[8] 1:20万武威幅地质图及区域地质矿产报告① 1:20万河西堡幅区域地质调查② 西北区域地层表甘肃省分册[9] 甘肃的第三系③ 1:25万定西、临夏幅区域地质调查④ 1:25万兰州市幅区域地质调查⑤ 1:25万武威、景泰幅区域地质调查⑥ 甘肃省区域地质志[10] 新近系甘肃建造 长子川系 新近系甘肃群 临夏组 四段 新近系甘肃群 临夏组 新近系甘肃群 上亚群 新近系甘肃群 咸水河组 第三组 新近系甘肃群 积石组 新近系甘肃群 二组 新近系 甘肃群 新近系甘肃群 上组 三段 二段 何王家组 一段 咸水河系 咸水河组 第三段 中新统 下亚群 第四组 毛沟组 一组 下组 第二段 第一段 
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