鄂西恩施笔架山第四系高角度砾石层地质特征及其成因探讨
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摘要
恩施笔架山高海拔第四系砾石层可见多个沉积旋回。通过对砾石层地理位置、沉积学特征、层序特征等研究,认为该砾石层为洪积成因,属洪积扇相扇根亚相,并发育支撑砾石。通过研究砾石沉积旋回对比该区域第四系以来的升降运动,探讨高角度砾石层的成因与第四系以来的掀斜运动的关系。
Enshi Bijiashan high altitude quaternary gravel layer shows multiple deposition cycles. Based on the study of the geographical location,sedimentology characteristics and sequence characteristics of the gravel layer,it is considered that the gravel layer is the cause of the proluvial,which belongs to the diluvial fan root subfacies and develops the characteristic support gravel. The relationship between the formation of the high-angle gravel layer and the uplift motion in the Quaternary system is discussed by comparing the gravel deposition cycle to the lift movement of the area since the Quaternary.
Enshi Bijiashan high altitude quaternary gravel layer shows multiple deposition cycles. Based on the study of the geographical location,sedimentology characteristics and sequence characteristics of the gravel layer,it is considered that the gravel layer is the cause of the proluvial,which belongs to the diluvial fan root subfacies and develops the characteristic support gravel. The relationship between the formation of the high-angle gravel layer and the uplift motion in the Quaternary system is discussed by comparing the gravel deposition cycle to the lift movement of the area since the Quaternary.
引文
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[2]王令占,牛志军,赵小明,等.清江流域层状地貌面堆积物特征及地貌演化研究[J].人民长江,2010,41(8):18-20.
[3]王令占,涂兵,田洋,等.鄂西利川清江源地区高海拔砾石层的发现与分析[J].人民长江,2011,42(11):1-4.
[4]王令占,涂兵,田洋,等.鄂西清江中上游高海拔砾石层ESR定年及地质意义[J].地球学报,2012,33(3):316-322.
[5]张纪易.粗碎屑洪积扇的某些沉积特征和微相划分[J].沉积学报,1985,3(3):75-83.
[6]朱筱敏.沉积岩石学[M].北京:石油工业出版社,2007.
[7]高名修.晚新生代地壳构造运动研究[J].地质力学学报,2008,14(4):295-319.
[8]葛肖虹,王敏沛,刘俊来.重新厘定“四川运动”与青藏高原初始隆升的时代、背景:黄陵背斜构造形成的启示[J].地学前缘,2010,17(4):206-217.
[9]杨达源,李徐生,柯贤坤,等.长江三峡坝区河谷深槽的地貌特征及其成因[J].地理学报,2002,57(5):547-552.
[10]阎桂林.研究鄂西南清江流域的新构造运动——利用第四纪沉积物的磁化率各向异性特征[J].地球物理学报,1994,37(s2):324-333.