Sediment partitioning and winnowing in a mixed eolian-marine system (Mauritanian shelf)

Sediment partitioning and winnowing in a mixed eolian-marine system (Mauritanian shelf)
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风成-海洋混合系统中的沉积物分配和取水(毛里塔尼亚陆架)

DOI:
10.1007/s00367-009-0136-8
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发表时间:
2009
期刊:
影响因子:
2.1
通讯作者:
Hanebuth
Hanebuth
中科院分区:
地球科学4区
文献类型:
--
作者:
Michel;Westphal;Hanebuth

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大陆架系统是一种高度动态的沉积环境,在这里,生物产物和陆源物质的沉积物在大陆架沉积系统中重新分布,并部分输出到陆坡和深海。Golfe d'Arguin(毛里塔尼亚,非洲西北部)主要是由这样的再分配过程,涉及碎屑粉砂进口的灰尘从撒哈拉沙漠和海洋起源的生物碳酸盐。实际上,表层沉积物的粒度和矿物学显示出沉积物类型明显的南北划分。细粒物质从海湾的北方部分被筛出,并被输送到Banc d'Arguin的南部,在那里,粗粉砂沉积在外部大陆架和上斜坡上,至少达到600 m水深。根据研究船上收集的风成物质估计,细粉砂部分的颗粒被认为被进一步输出到近海,因为它们对应于以前报告的邻近深海沉积物的粒度。这些研究结果表明,对非洲西北部大陆斜坡和隆起的尘埃记录的解释必须考虑到活跃在马达加斯加大陆架上的改造和划分过程。
Continental shelf systems are highly dynamic sedimentary environments, where sediments from biogenic production as well as from terrigenous sources are redistributed in the shelf depositional system, and partly exported off the shelf to the slope and the deep sea. The Golfe d’Arguin (Mauritania, NW Africa) is dominated by such redistribution processes, involving clastic silt imported as dust from the Sahara desert and biogenic carbonates of marine origin. Indeed, surface-sediment grain size and mineralogy show a clear north–south partitioning of sediment type. Fine material is winnowed from the northern part of the gulf, and transported toward the southern part off the Banc d’Arguin, where coarse silt settles on the outer shelf and upper slope, at least down to 600 m water depth. Particles of the fine silt fraction, estimated in terms of eolian material collected aboard the research vessel, are thought to be exported further offshore as they correspond to grain sizes previously reported from adjacent deep-sea sediments. These findings suggest that the interpretation of dust records from the continental slope and rise off NW Africa must consider reworking and partitioning processes active on the Mauritanian shelf.
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