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Biogenic coastal deposits: Isla del Carmen, Gulf of California, Mexico

机译：生物海岸沉积物：Isla del Carmen，墨西哥湾，墨西哥

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Coastal sedimentary deposits including beach and dunes within the south-central region of the Gulf of California show a high percentage of biogenic components, up to 84%, derived from the fragmentation of organisms that, among other oceanographic factors, reflect wave energy and effect of seasonal winds. Our report shows that due to high-energy waves, coastal deposits on points or islands with a northern exposure contain massive biocalcarenite deposits derived from mollusk shells, while areas of lower water energy located on coastal areas facing east or west commonly accumulate the crushed debris of coralline red algae, both as beach and dune deposits. Sheltered areas along any point or island oriented to the south will most likely attract colonization by coral reefs. Isla del Carmen clearly displays all these different types of biogenic deposits, making it an ideal model for the development of coastal carbonates throughout the western Gulf of California. Equally important, the general model has been persistent since early Pliocene times for the whole region. In particular for Isla del Carmen, this scenario precludes any tectonic block rotation, postulated in previous reports.
机译：加利福尼亚湾中南部地区的沿海沉积沉积物，包括海滩和沙丘，显示出高比例的生物成因，高达84％，源于生物的破碎，这些破碎除其他海洋学因素外，还反映了波能和海浪的影响。季节性风。我们的报告显示，由于高能波的影响，点或岛屿北部暴露的沿海沉积物含有源自软体动物壳的大量生物钙钙石沉积物，而位于东西方向的沿海地区水能较低的区域通常会堆积碎屑。珊瑚红藻，作为海滩和沙丘沉积物。朝南的任何地点或岛屿上的庇护区很可能会吸引珊瑚礁的定居。卡门岛（Isla del Carmen）清楚地展示了所有这些不同类型的生物成因沉积物，使其成为在整个加利福尼亚西部海湾开发沿海碳酸盐岩的理想模型。同样重要的是，自上新世初期以来，整个地区就一直坚持这种通用模式。特别是对于卡门岛来说，这种情况排除了先前报告中假定的任何构造块旋转。

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