Outcrop architecture of a fluvio-lacustrine succession: Upper Triassic Yanchang Formation, Ordos Basin, China
Outcrop architecture of a fluvio-lacustrine succession: Upper Triassic Yanchang Formation, Ordos Basin, China
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河流-湖泊序列的露头结构：中国鄂尔多斯盆地上三叠统延长组
DOI：
10.1016/j.marpetgeo.2015.09.001
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发表时间：
2015-12
影响因子：
4.2
通讯作者：
Jinyan Lin
中科院分区：
文献类型：
--
作者：
Junfeng Zhao;Nigel P. Mountney;Chiyang Liu;Hongjun Qu;Jinyan Lin
虽然有几项研究已经考虑了上三叠统延长组的沉积相，在含油气的鄂尔多斯盆地的油气潜力，这些研究大多解释地下数据，很少有系统地检查详细的露头解剖这个序列。本研究描述了鄂尔多斯盆地东南部沿80 km长的东西向道路岩屑系列的一系列暴露良好的露头剖面，以重建河湖序列的沉积结构，并确定控制堆积和保存风格的主要控制因素。延长组被划分为10个沉积单元-长10（底部）至长1（顶部）-记录了一系列大型河流体系的沉积演化，这些河流体系在进入大型的通道排水湖泊时构建了三角洲前缘和前三角洲体。对三角洲前缘体内部结构的详细分析记录了一个大型浅水三角洲层序的生长机制。湖相水下分流河道由3-15 m厚的砂岩充填物组成;这种河道化的河道体非常细长，许多可以追溯到几公里。这些机构可以被证明是通常与薄层河口坝和水下分流间湾沉积。长10 - 1沉积记录了晚三叠世4个主要的湖侵-湖退旋回：湖侵事件以10-20 m厚的油页岩层段广泛出现为标志;海退事件的标志是倾向于砂岩相组合向盆地中心的横向叠加，这些相组合主要聚集在河流、三角洲平原和上三角洲前缘环境中。长1段最上部记录了湖盆晚期充填。海进-海退旋回相当于可以在整个区域内相互关联的层序，其发展受到构造沉降速率、盆地边缘腹地沉积物输送速率和气候因素变化的综合控制，而气候因素本身又受到邻近秦岭造山带陆内生长的影响。
Although several studies have considered the sedimentary facies of the Upper Triassic Yanchang Formation in terms of their hydrocarbon potential in the petroliferous Ordos Basin, such studies have mostly interpreted subsurface data and few have systematically examined the detailed outcrop-based anatomy of this succession. This study characterizes a series of well-exposed outcrop sections along an 80-km-long E–W oriented series of road cuttings in the southeast Ordos Basin to reconstruct the sedimentary architecture of a fluvio-lacustrine succession and determine the principal controls that governed the style of accumulation and preservation. The Yanchang Formation is divided into 10 depositional units – Chang 10 (base) to Chang 1 (top) – that record the sedimentary evolution of a series of large-scale fluvial systems that constructed delta-front and pro-delta bodies as they entered a large, interior-draining lake. Detailed analysis of the internal architectures of the delta-front bodies records the mechanism of growth of a large-scale, shallow-water delta succession. Lacustrine subaqueous distributary channels are composed of 3–15 m-thick sandstone fills; such channelized bodies are highly elongate and many can be traced several kilometres. Such bodies can be shown to be commonly associated with thin-bedded mouth-bar and subaqueous interdistributary-bay deposition. The progradational architecture of the delta-front elements is difficult to recognize on outcrop scale.Deposits of the Chang 10 to 1 units record 4 major lacustrine transgressive-regressive cycles during the Late Triassic: transgressive events are signified by the widespread occurrence of 10–20 m-thick oil-shale-prone intervals; regressive events are signified by the progradational stacking towards the basin centre of sandstone-prone facies associations mainly accumulated in fluvial channel, delta–plain and upper delta-front environments. The uppermost Chang 1 interval records late-stage filling of the lacustrine basin. The transgressive-regressive cycles equate to sequences that can be correlated across the region, development of which was controlled by a combination of changes in the rate of tectonic subsidence, the rate of sediment delivery from the basin margin hinterland, and climate – factors that were themselves influenced by intracontinental growth of the neighbouring Qinling Orogen.
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DOI：
10.1007/978-3-662-03237-4
发表时间：
2006
期刊：
--
影响因子：
--
作者：
A. Miall
通讯作者：
A. Miall
DOI：
--
发表时间：
2009
期刊：
--
影响因子：
--
作者：
Zheng Wei
通讯作者：
Zheng Wei
影响因子：
2.3
作者：
H. Dill;S. Khishigsuren;J. Bulgamaa;Kh. Bolorma;F. Melcher
通讯作者：
H. Dill;S. Khishigsuren;J. Bulgamaa;Kh. Bolorma;F. Melcher
影响因子：
2.8
作者：
I. Overeem;S. Kroonenberg;A. Veldkamp;K. Groenesteijn;G. V. Rusakov;A. Svitoch
通讯作者：
I. Overeem;S. Kroonenberg;A. Veldkamp;K. Groenesteijn;G. V. Rusakov;A. Svitoch
影响因子：
2.8
作者：
B. L. Leren;J. Howell;H. Enge;A. Martinius
通讯作者：
B. L. Leren;J. Howell;H. Enge;A. Martinius