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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Composition and distribution of seabed and suspended sediments in north and central Torres Strait, Australia
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Composition and distribution of seabed and suspended sediments in north and central Torres Strait, Australia

机译：澳大利亚托雷斯海峡北部和中部海床和悬浮沉积物的组成和分布

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Widespread seagrass dieback in central Torres Strait, Australia has been anecdotally linked to the delivery of vast quantities of terrigenous sediments from New Guinea. The composition and distribution, and sedimentological and geochemical properties, of seabed and suspended sediments in north and central Torres Strait have been determined to investigate this issue. In northern Torres Strait, next to Saibai Island, seabed sediments comprise poorly sorted, muddy, mixed calcareous-siliciclastic sand. Seabed sediments in this region are dominated by aluminosilicate (terrigenous) phases. In central Torres Strait, next to Turnagain Island, seabed and suspended sediments comprise moderately sorted coarse to medium carbonate sand. Seabed sediments in this region are dominated by carbonate and magnesium (marine) phases. Mean Cu/Al ratios for seabed sediments next to Saibai Island are 0.01, and are similar to those found in New Guinea south coastal sediments by previous workers. Mean Cu/Al ratios for seabed sediments next to Turnagain Island are 0.02, indicating an enrichment of Cu in central Torres Strait. This enrichment comes from an exogenous biogenic source, principally from foraminifers and molluscs. We could not uniquely trace terrigenous sediments from New Guinea to Turnagain Island in central Torres Strait. If sediments are a factor in the widespread seagrass dieback in central Torres Strait, then our data suggest these are marine-derived sediments sourced from resuspension and advection from the immediate shelf areas and not terrigenous sediments dispersed from New Guinea rivers. This finding is consistent with outputs from recently developed regional hydrodynamic and sediment transport models. Crown Copyright (c) 2008 Published by Elsevier Ltd. All rights reserved.
机译：在澳大利亚的托雷斯海峡中部，广泛分布的海草消亡与从新几内亚输送大量陆源沉积物有着奇特的联系。已经确定了托雷斯海峡北部和中部海床和悬浮沉积物的成分和分布，以及沉积学和地球化学性质，以调查这一问题。在塞拜岛附近的托雷斯海峡北部，海底沉积物包括分类不良，泥泞，钙质硅质碎屑混合砂。该地区的海底沉积物以硅铝酸盐（陆相）相为主。在Turnagain岛旁边的Torres海峡中部，海床和悬浮沉积物包括中等分类的中度碳酸盐砂。该地区的海底沉积物以碳酸盐相和镁（海洋）相为主。塞拜岛附近海底沉积物的平均铜/铝比为0.01，与以前的工作人员在新几内亚南部沿海沉积物中发现的相似。 Turnagain岛旁海底沉积物的平均铜/铝比为0.02，表明托雷斯海峡中部的铜富集。这种富集来自外源性生物来源，主要来自有孔虫和软体动物。我们无法唯一地追溯到从新几内亚到托雷斯海峡中部特兰戈因岛的陆源沉积物。如果沉积物是造成托雷斯海峡中部海草广泛枯死的因素，那么我们的数据表明，这些是源自海洋的沉积物，这些沉积物来自于最近陆架地区的悬浮和平流，而不是来自新几内亚河的陆源性沉积物。这一发现与最近开发的区域水动力和泥沙输送模型的输出一致。 Crown版权所有（c）2008，由Elsevier Ltd.发行。保留所有权利。

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