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peneplain    
n. 准平原

准平原

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  • Peneplain - an overview | ScienceDirect Topics
    A peneplain is an extensive erosion surface that is formed by prolonged mass wasting and downwearing by sheetwash and channel flows, with just enough relief for its rivers to reach the sea It can be rejuvenated by uplift or falling base level and slowly consumed by fresh erosion From: Treatise on Geomorphology, 2013 About this page Add to
  • 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
  • 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
  • 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
  • The Pan-Amazonian Ucayali Peneplain, late Neogene sedimentation in . . .
    The Ucayali Peneplain was first identified by Kummel (1948) in the Contamana region of the Ucayali River valley of north central Amazonian Peru (Fig 1) He described the peneplain as having formed on the rock formations of the Contamana Group, which comprise the older Tertiary “red bed” sequence in Peru
  • 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
  • Cretaceous to Cenozoic evolution of the northern Lhasa Terrane and the . . .
    Such degraded or ruined peneplain remnants typically surround the more-or-less preserved peneplain areas The peneplains were carved into bedrocks, mostly in granitoids, however in the southern area some peneplains were formed in the Jurassic low-grade metamorphic siltstone-sandstone sequences and also in the Cretaceous ignimbrite complex
  • The Pan-Amazonian Ucayali Peneplain, late Neogene sedimentation in . . .
    The buried peneplain is readily observed in river cutbanks throughout Amazonia as the marked, often angular Ucayali Unconformity that separates eroded, older, often folded, faulted, and weathered, moderately to well consolidated Tertiary formations from unconsolidated, near horizontal, upper Neogene deposits
  • Landscape evolution of a bedrock peneplain on the southern Tibetan . . .
    Conclusions The analysis of cosmogenic 10 Be in four different kinds of samples from a large-scale bedrock peneplain in southern Tibet indicates that grus and amalgamated quartz clasts are best-suited to infer geologically meaningful denudation rates at the outcrop scale
  • Late Miocene-Pliocene geomorphological evolution of the Xiaoshuizi . . .
    The Xiaoshuizi peneplain is well preserved in the Maxian Mountains of the northeastern TP and is covered by thick aeolian red clay-loess sequences Our new high-resolution magnetostratigraphic evidence suggests that the red clay covering on the Xiaoshuizi peneplain can be dated from ~ 6 9 to ~ 3 6 Ma





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