安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
|
- Peneplain - an overview | ScienceDirect Topics
A peneplain is defined as an extensive erosion surface created by prolonged mass wasting and downwearing, characterized by minimal relief that allows rivers to reach the sea, serving as the ultimate base level It may be rejuvenated by geological uplift or changes in base level, leading to renewed erosion
- Erosion, isostatic response, and the missing peneplains
The peneplain—a low-relief erosional plain worn to near base level—is a venerable concept in geomorphology, geology, and geography Yet despite more than a century of effort, no convincing example of a contemporary peneplain has been identified, and the identification of relict peneplains is uncertain and controversial
- Late Miocene-Pliocene geomorphological evolution of the Xiaoshuizi . . .
Based on the integration of high-resolution magnetostratigraphy analysis and Pliocene mammal fossils, we demonstrate that the red clay-loess succession deposited on the Xiaoshuizi peneplain probably began to accumulate at ~ 6 9 Ma, implying that the Xiaoshuizi peneplain had begun to form before this
- A late Paleogene erosion event in the Sanshui Basin, southern margin of . . .
We assigned 29 Ma as the initial time of the late Cenozoic erosion event in the Sanshui Basin primarily on the basis of volcanic ages Previous studies on planation surfaces suggest that following the late Cretaceous to the Oligocene, the onshore southern SCB margin was largely a peneplain (Zhang and Huang, 1995; Zhou et al , 2008)
- Landscape evolution of a bedrock peneplain on the southern Tibetan . . .
The subhorizontal peneplain remnants appear in greenish color and are outlined with a purple dashed line Note that slope angles in the valleys dissecting the peneplain increase towards lower elevation as shown by the increasing intensity of the red color towards lower elevation
- Cycling of rare earth elements at the Precambrian-Cambrian boundary
Evidence for the mobility and concentration of REEs and strontium at the Precambrian-Cambrian boundary peneplain is recorded in Scotland The unconformity surface is marked by a concentration of phyllosilicate (pinite, a massive variety of muscovite, probably metamorphosed from illite), coloured variably green, yellow and pink (Fig 5, Fig 6)
- Regolith residence time and the concept of surface age of the Piedmont . . .
This results in a continual lowering of the Piedmont "peneplain" surface This interpretation is corroborated by evidence of topo- graphic inversion of fluvial gravels since the Miocene near the Fall Line Study of baseflow dissolved solids draining Piedmont basins indicates a minimum rate of saprolite production of about 4 m Ma- i
- Stratigraphic Landscape Analysis and geomorphological paradigms . . .
Stratigraphic Landscape Analysis is defined, based on empiric studies of the South Swedish Dome The relationship between relief in basement and cover rocks of different age directly on basement is investigated Crosscutting relationships between peneplains of different tilt and character, both re-exposed and epigene, are analysed Stratigraphic analysis of all Scandinavian relief results in
|
|
|