Heavy-mineral variability in miocene marine sediments in Denmark: a combined effect of weathering and reworking |
| |
| Authors: | Henrik Friis |
| |
| Institution: | Department of Geology, Aarhus Universitet Denmark |
| |
| Abstract: | Heavy-mineral analyses have been performed on marine sandy and silty deposits of Miocene age from the western part of Denmark. The heavy-mineral associations are dominated by epidote and amphibole, but the mutual distribution of these minerals is variable. Studies of surface textures show a large, but variable, proportion of the grains to be corroded. In a few cases the surface textures are indicative of post-depositional processes; however, most of these may have existed prior to deposition. It is suggested that the variations in heavy-mineral distribution and surface textures result from mixing of freshly supplied, unweathered detritus from Fennoscandia, with weathered detritus from the same provenance. This weathering took place during a temporary deposition in fluvial systems between the source area and the North Sea Basin. The relation to transgressive and regressive phases is discussed. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
