کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4689620 | 1636079 | 2012 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sedimentary and foraminiferal evidence of the 2011 TÅhoku-oki tsunami on the Sendai coastal plain, Japan
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Sedimentary and foraminiferal evidence of the 2011 TÅhoku-oki tsunami on the Sendai coastal plain, Japan Sedimentary and foraminiferal evidence of the 2011 TÅhoku-oki tsunami on the Sendai coastal plain, Japan](/preview/png/4689620.png)
چکیده انگلیسی
In the coastal forest and rice fields inundated by the TÅhoku-oki tsunami, a poorly sorted, dark brown soil is buried by a poorly sorted, brown, medium-grained sand deposit. In some trenches located more than 1.2 km inland, the sand is capped by a thin muddy-sand layer. The tsunami deposit, although highly variable in thickness, is generally thickest (25 cm) near the coastal dune and thins to less than 5 mm at ~ 4.5 km inland. The tsunami deposit was discriminated from the underlying soil by the appearance of recent and fossil foraminifera and a pronounced increase in grain size that fined upward and landward. The recent foraminifera preserved in the sandy facies of the deposit are rare and showed evidence of prolonged subaerial exposure (e.g. pitting, corrosion, fragmentation). Recent foraminifera likely originated from coastal dune and beach sediments that were breached by the tsunami. Calcified and sediment in-filled, fossil foraminifera are abundant and were eroded from sedimentary units and transported by fluvial or wave activity to Sendai Bay. Trends associated with test size (e.g. decreasing concentration of large test sizes with distance inland) are in agreement with grain size data. At two locations a decrease in total organic carbon and an increase in δ13C were found in the tsunami sand compared with the underlying soil, supporting a beach to intertidal origin for the upper unit.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sedimentary Geology - Volume 282, 30 December 2012, Pages 78-89
Journal: Sedimentary Geology - Volume 282, 30 December 2012, Pages 78-89
نویسندگان
Jessica E. Pilarczyk, Benjamin P. Horton, Robert C. Witter, Christopher H. Vane, Catherine Chagué-Goff, James Goff,