globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2014.09.017
Scopus记录号: 2-s2.0-84908572598
论文题名:
Coastal tectonics on the eastern margin of the Pacific Rim: Late Quaternary sea-level history and uplift rates, Channel Islands National Park, California, USA
作者: Muhs D.R.; Simmons K.R.; Schumann R.R.; Groves L.T.; DeVogel S.B.; Minor S.A.; Laurel D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 105
起始页码: 209
结束页码: 238
语种: 英语
英文关键词: Aminostratigraphy ; California ; Channel Islands ; Glacial-isostatic adjustment processes ; Marine terraces ; Pacific Rim ; Sea-level history ; Tectonics ; Uplift rates ; Uranium-series dating
Scopus关键词: Aminostratigraphy ; California ; Channel Islands ; Marine terraces ; Uplift rate ; Tectonics ; amino acid ; biostratigraphy ; coastal zone ; geomorphology ; Last Glacial Maximum ; mapping method ; Quaternary ; sea level change ; tectonics ; uplift ; uranium series dating ; California ; Channel Islands [California] ; El Salvador [Central America] ; Pacific Ocean ; Pacific Rim ; San Miguel ; Santa Rosa Island [Channel Islands] ; United States
英文摘要: The Pacific Rim is a region where tectonic processes play a significant role in coastal landscape evolution. Coastal California, on the eastern margin of the Pacific Rim, is very active tectonically and geomorphic expressions of this include uplifted marine terraces. There have been, however, conflicting estimates of the rate of late Quaternary uplift of marine terraces in coastal California, particularly for the northern Channel Islands. In the present study, the terraces on San Miguel Island and Santa Rosa Island were mapped and new age estimates were generated using uranium-series dating of fossil corals and amino acid geochronology of fossil mollusks. Results indicate that the 2nd terrace on both islands is ~120ka and the 1st terrace on Santa Rosa Island is ~80ka. These ages correspond to two global high-sea stands of the Last Interglacial complex, marine isotope stages (MIS) 5.5 and 5.1, respectively. The age estimates indicate that San Miguel Island and Santa Rosa Island have been tectonically uplifted at rates of 0.12-0.20m/ka in the late Quaternary, similar to uplift rates inferred from previous studies on neighboring Santa Cruz Island. The newly estimated uplift rates for the northern Channel Islands are, however, an order of magnitude lower than a recent study that generated uplift rates from an offshore terrace dating to the Last Glacial period. The differences between the estimated uplift rates in the present study and the offshore study are explained by the magnitude of glacial isostatic adjustment (GIA) effects that were not known at the time of the earlier study. Set in the larger context of northeastern Pacific Rim tectonics, Channel Islands uplift rates are higher than those coastal localities on the margin of the East Pacific Rise spreading center, but slightly lower than those of most localities adjacent to the Cascadia subduction zone. The uplift rates reported here for the northern Channel Islands are similar to those reported for most other localities where strike-slip tectonics are dominant, but lower than localities where restraining bends (such as the Big Bend of the San Andreas Fault) result in crustal shortening. © 2014.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60111
Appears in Collections:过去全球变化的重建

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作者单位: U.S. Geological Survey, Federal Center, MS 980, Box 25046, Denver, CO, United States; Section of Malacology, Natural History Museum of Los Angeles County, 900 Exposition Blvd., Los Angeles, CA, United States; Amino Acid Geochronology Laboratory, Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO, United States; Department of Geosciences, Colorado State University, 1482 Campus Delivery, Fort Collins, CO, United States

Recommended Citation:
Muhs D.R.,Simmons K.R.,Schumann R.R.,et al. Coastal tectonics on the eastern margin of the Pacific Rim: Late Quaternary sea-level history and uplift rates, Channel Islands National Park, California, USA[J]. Quaternary Science Reviews,2014-01-01,105
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