Architecture and morphology of the outer segment of a mixed tide and wave-dominated-incised valley, revealed by HR seismic reflection profiling: the paleo-Charente River, France
详细信息 查看全文
- 作者：Weber ; Nicolas ; Chaumillon ; Eric ; Tesson ; Michel ; Garlan ; Thierry
- 关键词：high-resolution seismic ; incised valley fill ; sequence stratigraphy ; holocene transgression
- 刊名：Marine Geology
- 出版年：2004
- 出版时间：June 30, 2004
- 年：2004
- 卷：207
- 期：1-4
- 页码：17-38
- 全文大小：2.52 M
文摘
We present new single-channel high-resolution seismic reflection profiles, ground-truthed by vibrocore data, dedicated to the outer segment of an incised valley connected to the Charente River (French Atlantic coast). The present-day Charente is located about 50 km northward of the well-known Gironde estuary. Those river mouths are comparable in terms of marine hydrodynamic parameters, but strongly differ by their water discharge and catchment area. Seismic data are processed and interpreted to develop a three-dimensional seismic stratigraphic framework for the Charente-incised valley fill. The channel network of the drowned Charente valley is evidenced for the first time, and shows a seaward distributary pattern which is likely influenced by neotectonic control. Incision depth and width of the Charente and Gironde-incised valleys are similar, supporting the idea that correlation between valley width and modern hydrology is poor.