Plio-Quaternary uplift of the Manta Peninsula and La Plata Island and the subduction of the Carnegie Ridge, central coast of Ecuador

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	Plio-Quaternary uplift of the Manta Peninsula and La Plata Island and the subduction of the Carnegie Ridge, central coast of Ecuador
	Pedoja, K ; Dumont, JF ; Lamothe, M ; Ortlieb, L ; Collot, JY ; Ghaleb, B ; Auclair, M ; Alvarez, V ; Labrousse, B
刊名	JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
	2006
卷号	22 期号:40545 页码:40564
关键词	marine terrace luminescence ridge subduction coastal uplift pleistocene Ecuador
ISSN号	0895-9811
通讯作者	dumont@geoazur.obs-vlfr.fr
中文摘要	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.
学科主题	Geosciences, Multidisciplinary
收录类别	SCI
原文出处	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000243250100001
公开日期	2011-07-03
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/4384]
专题	南海海洋研究所_中科院边缘海地质重点实验室
推荐引用方式 GB/T 7714	Pedoja, K,Dumont, JF,Lamothe, M,et al. Plio-Quaternary uplift of the Manta Peninsula and La Plata Island and the subduction of the Carnegie Ridge, central coast of Ecuador[J]. JOURNAL OF SOUTH AMERICAN EARTH SCIENCES,2006,22(40545):40564.
APA	Pedoja, K.,Dumont, JF.,Lamothe, M.,Ortlieb, L.,Collot, JY.,...&Labrousse, B.(2006).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,22(40545),40564.
MLA	Pedoja, K,et al."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 22.40545(2006):40564.