منابع مشابه
Continuous thermal histories from closure profiles
INTRODUCTION Background Most geophysical processes impart a characteristic thermal signature to the crust that can be preserved in the form of isotopic variations in radiogenic minerals. Reading the record of these events using thermochronology permits unprecedented insights into the timing and rates of key dynamic processes, such as rifting, thrust faulting, tectonic denudation, erosion/incisi...
متن کاملGeomorphic histories for river and catchment management.
River and catchment management usually proceeds from the identification of an undesirable state (e.g. pollution, sedimentation, excessive water extraction, dams, invasion by exotic species) to a strategy for reaching a desirable state described as a target. Desirable states are usually determined from community values, economic assessments and ecosystem functions, or a combination of these. Whe...
متن کاملStructures, textures, and cooling histories of Columbia River basalt flows
Flood basalt flows of the Columbia River Basalt Group commonly exhibit well-developed colonnade and entablature structures formed during cooling of individual flows. The colonnade refers to the well-defined columnar structure of many flows, which appears in the lowermost 10% to 30% and, in places, the uppermost 10% to 20%. Entablature refers to those parts of a flow that have smaller column dia...
متن کاملSolutions of the stream power equation and application to the evolution of river longitudinal profiles
[1] Erosion by bedrock river channels is commonly modeled with the stream power equation. We present a two-part approach to solving this nonlinear equation analytically and explore the implications for evolving river profiles. First, a method for non-dimensionalizing the stream power equation transforms river profiles in steady state with respect to uniform uplift into a straight line in dimens...
متن کاملQuantifying the role of paleoclimate and Andean Plateau uplift on river incision
[1] River incision over geologic timescales can be a valuable indicator of regional surface uplift. However, extracting the timing of surface uplift relative to the onset of incision is complicated by changes in precipitation commensurate with topographic development. Evidence of large-scale river incision on the flanks of the Andean plateau has been cited in support of a rapid and recent surfa...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2009
ISSN: 0094-8276
DOI: 10.1029/2009gl040928