DOI: 10.1016/j.quascirev.2017.08.015
Scopus记录号: 2-s2.0-85027974200
论文题名: Reinterpretation of the Quaternary sedimentary infill of the Ría de Vigo, NW Iberian Peninsula, as a compound incised valley
作者: Martínez-Carreño N. ; García-Gil S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 173 起始页码: 124
结束页码: 144
语种: 英语
英文关键词: Holocene
; Incised-valley
; Pleistocene
; Sea level changes
; Seismic stratigraphy
; Western Europe
英文摘要: Seismic data have been used to investigate the stratigraphy of the Galician rias for more than two decades. Here, we present a new interpretation of the sedimentary infill of an incised valley (Ría de Vigo, NW Iberian Peninsula), based on high-resolution seismic profiles, core sediment analysis, and radiocarbon 14C data. The new data indicate that the stratigraphic architecture of the Galician rias result from multiple incision/infill phases and, therefore, they are reclassified as compound rather than simple incised valleys. Seven seismic units were identified: one of Tertiary age (U1), four of Pleistocene age (U2–U5) which are interpreted as 4th-order sequences deposited between MIS 11 and MIS 2, and Late Pleistocene (U6) and Holocene (U7) units corresponding with post-glacial sedimentation. The sedimentary infill overlies a highly faulted irregular granitic and metamorphic basement; the inherited morphology is shown to be important for controlling the pathway and evolution of the fluvial network as well as preservation of the sedimentary deposits during several glacial/interglacial cycles. The presence of a rocky barrier at the mouth of the ria is a distinctive feature that conditions sedimentation and exchange of sediment between the ria and the adjacent shelf. For the first time, faults and tilted blocks affecting Late Pleistocene (MIS 3) deposits have been identified. The new data presented here provide the opportunity to reconstruct the evolution of the sedimentary infill of a ria, with especially high-resolution during the last post-glacial transgression. © 2017 Elsevier Ltd 资助项目: We would like to thank the anonymous reviewers for their constructive comments. This research was supported by the Spanish Ministry of Economy and Competitiveness and the European Regional Development Fund (CGL2012-33584), and by the Xunta de Galicia (Project GRC 2015/020).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59107
Appears in Collections: 过去全球变化的重建
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作者单位: Departamento de Geociencias Marinas, University of Vigo, Spain
Recommended Citation:
Martínez-Carreño N.,García-Gil S.. Reinterpretation of the Quaternary sedimentary infill of the Ría de Vigo, NW Iberian Peninsula, as a compound incised valley[J]. Quaternary Science Reviews,2017-01-01,173