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QUANTIFYING SOURCES AND TRANSPORT PATHWAYS OF SURFACE SEDIMENTS IN THE GULF OF SAN JORGE, CENTRAL PATAGONIA (ARGENTINA)

机译：中巴塔哥尼亚（加利福尼亚州）圣若尔湾的地表沉积物来源和运输途径的量化

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The Gulf of San Jorge (GSJ) is a semicircular basin, approximately 160 km long and 250 km wide, located in the central part of Patagonia between 45 degrees S and 47 degrees S, lacking any present-day major perennial tributaries. The grain size and bulk and clay mineralogical compositions as well as major and minor elements of 75 surface sediment samples from the GSJ and the adjacent continental shelf were investigated to define the spatial distribution, transport pathways, and potential sources of terrigenous material. To better constrain the origins of GSJ sediments, analyses were also performed on 14 terrestrial, riverine, and marine samples from potential source areas around the gulf and Patagonia. The mineral assemblage of surface sediments in the gulf, dominated by plagioclase, quartz, and clays, is a function of the primary continental volcanic geology of Patagonia. The significant concentration of volcaniclastic particles indicated by mineralogical signatures and scanning electron microscope images of sediments suggests a substantial contribution from rhyolitic volcanism to the modern sedimentation in the gulf. High amounts of smectite are carried into the GSJ by dust transport, whereas inputs of chlorite and illite seem to be associated with continental shelf current transport from southern Patagonia. Finally, our results suggest that 50% of the surface sediment in the GSJ is derived from external/oceanic inputs, 40% from inner gulf shores (i.e., erosion and runoff), and 10% from dust (i.e., aeolian transport).
机译：圣豪尔赫湾（GSJ）是一个半圆形盆地，长约160公里，宽250公里，位于巴塔哥尼亚中部，南纬45度至47度之间，没有任何现今的主要多年生支流。研究了来自GSJ和邻近大陆架的75个地表沉积物样品的粒度，体积和粘土矿物学组成以及主要和次要元素，以确定空间分布，运输途径和陆源物质的潜在来源。为了更好地限制GSJ沉积物的来源，还对来自海湾和巴塔哥尼亚周围潜在来源地区的14个陆地，河流和海洋样本进行了分析。海湾中地表沉积物的矿物组合，主要由斜长石，石英和粘土构成，是巴塔哥尼亚主要大陆火山地质的函数。矿物学特征和沉积物的扫描电子显微镜图像表明，火山碎屑颗粒的浓度很高，表明流纹岩火山作用对海湾现代沉积有重要贡献。大量的蒙脱石通过粉尘运输被带入GSJ，而绿泥石和伊利石的输入似乎与来自巴塔哥尼亚南部的大陆架当前运输有关。最后，我们的结果表明，GSJ中50％的表层沉积物来自外部/海洋输入，40％来自内部海湾海岸（即侵蚀和径流），10％来自灰尘（即风沙运输）。

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  • 来源
    《Oceanography》 |2018年第4期|92-103|共12页
  • 作者

    Desiage Pierre-Arnaud; Montero-Serrano Jean-Carlos; St-Onge Guillaume; Cesar Crespi-Abril Augusto; Giarratano Erica; Noemi Gil Monica; Haller Miguel J.;

  • 作者单位

    Univ Quebec Rimouski, Inst Sci Mer Rimouski ISMER, Rimouski, PQ, Canada;

    Univ Quebec Rimouski, Inst Sci Mer Rimouski ISMER, Rimouski, PQ, Canada;

    Univ Quebec Rimouski, Marine Geol, ISMER, Rimouski, PQ, Canada|Univ Quebec Rimouski, GEOTOP, Rimouski, PQ, Canada;

    UNPSJB, Comodoro Rivadavia, Argentina|Consejo Nacl Invest Cient & Tecn, Ctr Nacl Patagon CENPAT, Ctr Estudio Sistemas Marinos, Puerto Madryn, Argentina;

    Consejo Nacl Invest Cient & Tecn, CENPAT, Puerto Madryn, Argentina;

    UNPSJB, Comodoro Rivadavia, Argentina|Consejo Nacl Invest Cient & Tecn, CENPAT, Puerto Madryn, Argentina;

    UNPSJB, Comodoro Rivadavia, Argentina|Consejo Nacl Invest Cient & Tecn, CENPAT, Puerto Madryn, Argentina;

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