Contingency table analysis of pebble lithology and roundness: A casestudy of Huangshui River, China and comparison to rivers in the RockyMountains, USA

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	Contingency table analysis of pebble lithology and roundness: A casestudy of Huangshui River, China and comparison to rivers in the RockyMountains, USA
	Miao, Xiaodong; Lindsey, David A; .Lai, Zhongping; Liu, Xiaodong
	2010
发表期刊	SEDIMENTARY GEOLOGY
ISSN	0037-0738
卷号	224 期号:1-4 页码:49-53
摘要	Contingency table analysis of pebble lithology and roundness is an effective way to identify the source terrane of a drainage basin and to distinguish changes in basin size, piracy, tectonism, and other events. First, the analysis to terrace gravel deposited by the Huangshui River, northeastern Tibet Plateau, China, shows statistically contrasting pebble populations for the oldest terrace (T7, Dadongling, 1.2 Ma) and the youngest terraces (T0-T3, <= 0.15 Ma). Two fluvial processes are considered to explain the contrast in correlation between lithology and roundness in T7 gravel versus T0-T3 gravel: 1) reworking of T7 gravel into T0-T3 gravel and 2) growth in the size of the river basin between T7 and T0-T3 times. We favor growth in basin size as the dominant process, from comparison of pebble counts and contingency tables. Second, comparison of results from Huangshui River of China to three piedmont streams of the Rocky Mountains, USA highlights major differences in Source terrane and history. Like Rocky Mountain piedmont gravel from Colorado examples, the Huangshui gravels show a preference (observed versus expected frequency) for rounded granite. But unlike Rocky Mountain gravel, Huangshui gravel shows a preference for angular quartzite and for rounded sandstone. In conclusion, contrasting behavior of lithologies during transport, not always apparent in raw pebble counts, is readily analyzed using contingency tables to identify the provenance of individual lithologies, including recycled clasts. Results of the analysis may help unravel river history, including changes in basin size and lithology. Published by Elsevier B.V. Contingency table analysis of pebble lithology and roundness is an effective way to identify the source terrane of a drainage basin and to distinguish changes in basin size, piracy, tectonism, and other events. First, the analysis to terrace gravel deposited by the Huangshui River, northeastern Tibet Plateau, China, shows statistically contrasting pebble populations for the oldest terrace (T7, Dadongling, 1.2 Ma) and the youngest terraces (T0-T3, <= 0.15 Ma). Two fluvial processes are considered to explain the contrast in correlation between lithology and roundness in T7 gravel versus T0-T3 gravel: 1) reworking of T7 gravel into T0-T3 gravel and 2) growth in the size of the river basin between T7 and T0-T3 times. We favor growth in basin size as the dominant process, from comparison of pebble counts and contingency tables. Second, comparison of results from Huangshui River of China to three piedmont streams of the Rocky Mountains, USA highlights major differences in Source terrane and history. Like Rocky Mountain piedmont gravel from Colorado examples, the Huangshui gravels show a preference (observed versus expected frequency) for rounded granite. But unlike Rocky Mountain gravel, Huangshui gravel shows a preference for angular quartzite and for rounded sandstone. In conclusion, contrasting behavior of lithologies during transport, not always apparent in raw pebble counts, is readily analyzed using contingency tables to identify the provenance of individual lithologies, including recycled clasts. Results of the analysis may help unravel river history, including changes in basin size and lithology. Published by Elsevier B.V.
语种	英语
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/1931
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所
推荐引用方式 GB/T 7714	Miao, Xiaodong,Lindsey, David A,.Lai, Zhongping,et al. Contingency table analysis of pebble lithology and roundness: A casestudy of Huangshui River, China and comparison to rivers in the RockyMountains, USA[J]. SEDIMENTARY GEOLOGY,2010,224(1-4):49-53.
APA	Miao, Xiaodong,Lindsey, David A,.Lai, Zhongping,&Liu, Xiaodong.(2010).Contingency table analysis of pebble lithology and roundness: A casestudy of Huangshui River, China and comparison to rivers in the RockyMountains, USA.SEDIMENTARY GEOLOGY,224(1-4),49-53.
MLA	Miao, Xiaodong,et al."Contingency table analysis of pebble lithology and roundness: A casestudy of Huangshui River, China and comparison to rivers in the RockyMountains, USA".SEDIMENTARY GEOLOGY 224.1-4(2010):49-53.

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