Mantle-driven dynamic uplift of the Rocky Mountains and Colorado Plateau and its surface response: Toward a unified hypothesis
Mantle-driven dynamic uplift of the Rocky Mountains and Colorado Plateau and its surface response: Toward a unified hypothesis
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落基山脉和科罗拉多高原地幔驱动的动态隆起及其地表响应：走向统一的假说
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发表时间：
2012
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通讯作者：
M. Donahue
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作者：
K. Karlstrom;D. Coblentz;K. Dueker;W. Ouimet;E. Kirby;J. Wijk;B. Schmandt;S. Kelley;G. Lazear;L. Crossey;R. Crow;A. Aslan;A. Darling;R. Aster;J. MacCarthy;S. Hansen;J. Stachnik;D. Stockli;R. V. Garcia;M. Hoffman;R. McKeon;J. Feldman;M. Heizler;M. Donahue
地壳和地幔中的地震速度异常与大陆规模的科罗拉多河系统的差异切割之间的对应关系表明，在大陆内部深处可以发生显著的地幔-地表相互作用。科罗拉多州落基山脉地区表现出低地震速度的地壳和地幔，与非典型的高(和粗糙的)地形、陡峭的标准化河段和差异最大的河流切割区域有关。热年代学和地质资料表明，区域折返开始于约6-10 Ma，特别是在低速地幔下的地区。不同地质和地球物理数据集的整合和综合支持了一种挑衅性的假设，即在过去10 Ma期间，新近系地幔对流驱动了长波形变和倾斜。随之而来的500-1000m的地表抬升可能占该地区目前海拔的25%-50%，其余的是在拉拉米德和中第三纪隆升期间实现的。这一假说突显了在板内环境中对地幔动力学表面响应的性质和大小进行持续多学科测试的重要性。
The correspondence between seismic velocity anomalies in the crust and mantle and the differential incision of the continental-scale Colorado River system suggests that significant mantle-to-surface interactions can take place deep within continental interiors. The Colorado Rocky Mountain region exhibits low-seismic-velocity crust and mantle associated with atypically high (and rough) topography, steep normalized river segments, and areas of greatest differential river incision. Thermochronologic and geologic data show that regional exhumation accelerated starting ca. 6–10 Ma, especially in regions underlain by low-velocity mantle. Integration and synthesis of diverse geologic and geophysical data sets support the provocative hypothesis that Neogene mantle convection has driven long-wavelength surface deformation and tilting over the past 10 Ma. Attendant surface uplift on the order of 500–1000 m may account for ∼25%–50% of the current elevation of the region, with the rest achieved during Laramide and mid-Tertiary uplift episodes. This hypothesis highlights the importance of continued multidisciplinary tests of the nature and magnitude of surface responses to mantle dynamics in intraplate settings.