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SEGMENTATION OF ALLUVIAL FANS IN DEATH-VALLEY, CALIFORNIA - NEW INSIGHTS FROM SURFACE EXPOSURE DATING AND LABORATORY MODELING | |
HOOKE, RL; DORN, RI | |
通讯作者 | HOOKE, RL |
来源期刊 | EARTH SURFACE PROCESSES AND LANDFORMS
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ISSN | 0197-9337 |
出版年 | 1992 |
卷号 | 17期号:6页码:557-574 |
英文摘要 | Laboratory experiments, recent paleoenvironmental analyses of rock varnish, and surface exposure dating of geomorphic units have led to new insights into the process of entrenchment and segmentation of alluvial fans, and into the history of Quaternary sedimentation in Death Valley. Entrenchment begins at the fanhead. As the trench deepens, its down-slope end migrates down-fan, taking several tens of thousands of years to reach lower parts of the fan. Laboratory experiments suggest, however, that a new segment begins to grow at the toe long before the trench reaches this part of the fan. Furthermore, the initial slope of the segment is not the equilibrium slope. Field evidence supports this model. The tectonic tilting that caused entrenchment and segmentation in Death Valley may have been triggered by loading of the valley with water. Sedimentation on the salt pan in southern Death Valley is not, at present, in equilibrium with that on the fans. Rather, it seems to be adjusting to an increase in the amount of fine material reaching the playa, due in part to breaching of the outlet of Lake Tecopa somewhat after 600 ka BP, and in part to subsidence of different parts of the valley at different rates. Failure to recognize this disequilibrium resulted in errors in earlier estimates of the age of the segmentation events. |
英文关键词 | ALLUVIAL FANS ROCK VARNISH SURFACE EXPOSURE DATING DEATH VALLEY QUATERNARY |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:A1992JM49300002 |
WOS关键词 | ROCK-VARNISH ; COSMOGENIC HE-3 ; CHRONOLOGY ; DESERT ; NEVADA ; CANYON ; BASIN |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
WOS研究方向 | Physical Geography ; Geology |
来源机构 | Arizona State University |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/127518 |
作者单位 | (1)ARIZONA STATE UNIV,DEPT GEOG,TEMPE,AZ 85287 |
推荐引用方式 GB/T 7714 | HOOKE, RL,DORN, RI. SEGMENTATION OF ALLUVIAL FANS IN DEATH-VALLEY, CALIFORNIA - NEW INSIGHTS FROM SURFACE EXPOSURE DATING AND LABORATORY MODELING[J]. Arizona State University,1992,17(6):557-574. |
APA | HOOKE, RL,&DORN, RI.(1992).SEGMENTATION OF ALLUVIAL FANS IN DEATH-VALLEY, CALIFORNIA - NEW INSIGHTS FROM SURFACE EXPOSURE DATING AND LABORATORY MODELING.EARTH SURFACE PROCESSES AND LANDFORMS,17(6),557-574. |
MLA | HOOKE, RL,et al."SEGMENTATION OF ALLUVIAL FANS IN DEATH-VALLEY, CALIFORNIA - NEW INSIGHTS FROM SURFACE EXPOSURE DATING AND LABORATORY MODELING".EARTH SURFACE PROCESSES AND LANDFORMS 17.6(1992):557-574. |
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