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学科主题: Geosciences, Multidisciplinary
题名: Plio-Quaternary uplift of the Manta Peninsula and La Plata Island and the subduction of the Carnegie Ridge, central coast of Ecuador
作者: Pedoja, K ; Dumont, JF ; Lamothe, M ; Ortlieb, L ; Collot, JY ; Ghaleb, B ; Auclair, M ; Alvarez, V ; Labrousse, B
通讯作者: dumont@geoazur.obs-vlfr.fr
关键词: marine terrace ; luminescence ; ridge subduction ; coastal uplift ; pleistocene ; Ecuador
刊名: JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
发表日期: 2006
卷: 22, 期:40545, 页:40564
收录类别: sci
部门归属: Chinese Acad Sci, Key Lab Marginal Sea Geol, S China Sea Inst, Guangzhou, Peoples R China; Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou, Peoples R China; Observat Oceanol, IRD, UMR 6526 Geosci Azur, F-06235 Villefranche Sur Mer, France; Univ Quebec, Dept Sci Terre & Atmosphere, Montreal, PQ H3C 3P8, Canada; IRD, PALEOTROPIQUE, F-93143 Bondy, France; Univ Quebec, GEOTOP, Montreal, PQ H3C 3P8, Canada
项目归属: 海洋地质
摘要: This paper quantifies the uplift of the Manta Peninsula and La Plata Island (Ecuador) using marine terraces. These marine terraces are part of a more extensive segment of uplifting coast extending all along the Talara arc, from 6.5 degrees S to 1 degrees N. Along this arc, the highest terraces are observed on the Manta Peninsula with five marine terraces up to 360 +/- 10 m. On La Plata Island, four marine terraces are raised up to 170 +/- 10 in. The terraces are dated using infrared- stimulated luminescence (IRSL) and U-Th methods. The calculated uplifts range from 0.3 to 0.5 mm yr(-1) for the past 300 ka. The oldest terraces show a transition to the synsedimentary uplifted Plio-Pleistocene deposits of the Canoa Formation. In comparison with the lower uplift rates documented in the Santa Elena Peninsula to the south and the Esmeraldas area to the north, the uplift of the Manta Peninsula gives an account of the effect of the subduction of the Carnegie Ridge since the late Pliocene. The coastal uplift ends to the north outside the projection point of the border of the Carnegie Ridge but extends southward along the northern margin of the Gulf of Guayaquil, outside of the effect of the Carnegie Ridge, which suggests that other elements must be considered for uplift in this area. A weak scan pattern of the Carnegie Ridge along the coast is observed, but instead of a true scan motion, the context suggests the possibility of a segmented ridge and the head-on introduction in the trench of a new segment with a beveled front trending parallel to the Grijalva fracture zone. The onset of subduction of the Carnegie Ridge seems correlated with a change in the tectonic deformation of the coast, from compression conditions before the middle-late Pliocene to extension conditions during the subduction of the ridge. (c) 2006 Elsevier Ltd. All rights reserved.
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WOS记录号: WOS:000243250100001
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4384
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Pedoja, K; Dumont, JF; Lamothe, M; Ortlieb, L; Collot, JY; Ghaleb, B; Auclair, M; Alvarez, V; Labrousse, B.Plio-Quaternary uplift of the Manta Peninsula and La Plata Island and the subduction of the Carnegie Ridge, central coast of Ecuador,JOURNAL OF SOUTH AMERICAN EARTH SCIENCES,2006,22(40545):40564
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文件名: Plio-Quaternary uplift of the Manta Peninsula and La Plata Island and the subduction of the Carnegie Ridge, central coast of Ecuador .pdf
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