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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
ISSN0197-9337
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
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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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