期刊
TECTONICS
卷 35, 期 9, 页码 2117-2130出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016TC004194
关键词
Laramide orogeny; Rocky Mountain; Raton basin; provenance; basin analysis
资金
- Geological Society of America Graduate Research Grant
- American Association of Petroleum Geologists Wanek Memorial Grant
- Gulf Coast Association of Geological Societies Graduate Research Grant
- Colorado Scientific Society Research Grant
- Stat-oil Graduate Research Fellowship
New geochronological constraints on upper crustal exhumation in the southern Rocky Mountains help delineate the latest Cretaceous-Paleogene history of drainage reorganization and landscape evolution during Laramide flat-slab subduction beneath western North America. Detrital zircon U-Pb results for the Raton basin of southern Colorado and northern New Mexico define the inception of coarse-grained siliciclastic sedimentation and a distinctive shift in provenance, from distal to proximal sources, that recorded shortening-related uplift and unroofing along the Laramide deformation front of the northern Sangre de Cristo Mountains. This Maastrichtian-early Paleocene (similar to 70-65Ma) changefrom distal foreland accumulation of sediment derived from the thin-skinned Cordilleran (Sevier) fold-thrust belt to coarse-grained sedimentation proximal to a Laramide basement block upliftreflects cratonward (eastward) deformation advance and reorganization of drainage systems that supplied a large volume of Paleocene-lower Eocene sediments to the Gulf of Mexico. The timing of unroofing along the eastern deformation front is synchronous with basement-involved shortening across the interior of the Laramide province, suggesting abrupt wholesale uplift rather than a systematic inboard advance of deformation. The growth and infilling of broken foreland basins within the interior and margins of the Laramide province had a significant impact on continental-scale drainage systems, as several ponded/axial Laramide basins trapped large volumes of sediment and induced reorganization of major source-to-sink sediment pathways.
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