Relations between stream sediment and source-rock mineralogy,Piney Creek Basin,Wyoming |
| |
| Authors: | WW Schock JR Steidtmann |
| |
| Institution: | Department of Geology, University of Wyoming, Laramie, Wyo. U.S.A. |
| |
| Abstract: | The areal distribution of stream sediment and source-rock heavy mineralogy was studied to determine the mineralogical relations between source and derived sediment in the Piney Creek drainage basin of Wyoming. Heavy-mineral distribution in the streams was characterized using factor analysis. The results of analyses show that for an actively degrading stream system, the heavy-mineral composition of stream sediment is controlled to a considerable extent by the composition of local sediment sources and by continuous addition of detritus from bank cutting. Only the most common minerals from upstream sources persist as statistically significant variables downstream. In some cases the heavy-mineral mineral composition of stream sediment can be controlled by comparatively few, or volumetrically rare source rocks, even though more abundant source rocks supply a wide range of heavy minerals. Specific drainage configurations such as lakes and proximity of streams to major sediment sources significantly modify sediment mineralogy immediately downstream. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
