Subdivision of Famennian (Late Devonian) Strata in the Northwest Border of the Junggar Basin , Xinjiang, Northwestern China
详细信息
- 责任者：Ma Xueping (School of Earth and Space Sciences ; Peking University ; Beijing 100871 ; China) ; Zong Pu
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(6)
- 关键词：法门阶 ; Famennian ; 地层划分 ; stratigraphic classification ; 准噶尔盆地 ; Junggar Basin
- 页码：p.255-268
- 图表：5 illus., 20 refs.
- 分类号：1200
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
The Xar Burd Mountain and adjacent places are a representative area for the Devonian and Lower Carboniferous in the Junggar-Hinggan Stratigraphic Regions.The eastern side of the Hebukehe River at its middle reaches(the Saerbagende Mountain area)is the typical locality of the Hebukehe Formation,which has been widely known to the Chinese Devonian workers.However,due to its severe tectonic deformation/modification,many problems were not resolved in the description of the original type section of the Hebukehe Formation.There have been different opinions about its lithological sequence and relation with the Hongguleleng Formation.Based on field investigation in the past few years,Famennian lithological sequence in the Saerbagende Mountain(Saerba in short)area has been established.Owing to the overall similarity of stratigraphic sequence between the Saerbagende Mountain area and the Bulongguoer section,it is naturally reasonable that the name of"Hebukehe Formation"should be abandoned and that the name of Hongguleleng Formation should be used instead.The Famennian in the Saerba area consists of the Hongguleleng Formation and the lower part of the Heishantou Formation.The Hongguleleng Formation contains cyrtospiriferid brachiopods and"Cyrtoclymenia"and Platyclymeniaammonoids and can be subdivided into five members(all new names),in ascending order:(1)Saerba Member,characterized by a suite of(shelly)limestones;(2)Longkou Member,characterized by a suite of grayish green sandstone,conglomerate,and siltstone;(3)Duguer Member,characterized by a suite of marly and argillaceous limestones;(4)Wulan Member,characterized by a suite of purplish red"nodular"sandy limestone,purplish red and grayish green siliceous siltstone and siliceous mudstone;(5)Chasi Member,characterized by a suite of gray(weathered yellowish)calcareous sandstone/calcareous siltstone and sandy limestone.The overlying Heishantou Formation(lower part only)is the topmost Devonian strata,characterized by a suite of dark gray siliceous siltstone,siliceous mudstone,cherts,fine sandstone and purplish red silty,siliceous mudstone-shale,bearing the brachiopod Syringothyris-Spirifer fauna and the ammonoid Cymaclymenia.