Transgressive sand sheet covering the shelf and upper slope off Sendai, Northeast Japan
Transgressive sand sheet covering the shelf and upper slope off Sendai, Northeast Japan
复制标题
覆盖日本东北部仙台附近陆架和上坡的海侵沙层
DOI：
10.1016/0025-3227(89)90078-9
复制
发表时间：
1989
期刊：
影响因子：
--
通讯作者：
E. Matsumoto
中科院分区：
文献类型：
--
作者：
Y. Saito;A. Nishimura;E. Matsumoto
日本东北部仙台外陆架和陆坡上覆盖着一层在距今14,000 - 6000年最后一次大海侵期间沉积的薄砂席。砂层覆盖在最后一个低海平面时期沉积的沉积物上，部分被现代近海泥浆覆盖。该席被认为是在水深> 50 m的海侵过程中形成的后冲积层沉积物。该砂席厚度为50-150 cm，由分选不良的薄砂层和几毫米至几厘米厚的泥层交替组成。它带有混合环境的软体动物壳和少量的钙钛矿。经常发现冲填构造。在席状岩底部附近常有砾石和贝壳碎片。
A thin sand sheet deposited during the last major transgression from 14,000 to 6000 yrs B.P. covers the shelf and upper slope off Sendai, Northeast Japan. The sand sheet overlies the sediments deposited during the last low sea-level stand, and is partly overlain by modern offshore muds. This sheet is regarded as palimpsest sediment, formed during the transgression in water depths of > 50 m.The sand sheet is 50–150 cm thick, and consists of alternations of poorly sorted thin sand layers and mud layers that are several millimeters to a few centimeters thick. It bears mixed-environment molluscan shells and small amounts of glauconite. Scour-and-fill structures are frequently found. Gravel with shell fragments is common near the base of the sheet.