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首页> 外文期刊>Marine Geology >Facies architecture of the mixed carbonate/siliciclastic inner continental shelf of west-central Florida: implications for Holocene barrier development
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Facies architecture of the mixed carbonate/siliciclastic inner continental shelf of west-central Florida: implications for Holocene barrier development

机译：佛罗里达州中西部混合碳酸盐/硅质碎屑内陆大陆架的相结构：对全新世屏障发展的影响

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摘要

Sediment vibracores and surface samples were collected from the mixed carbonate/siliciclastic inner shelf of west-central Florida in an effort to determine the three-dimensional facies architecture and Holocene geologic development of the coastal barrier-island and adjacent shallow marine environments. The unconsolidated sediment veneer is thin (generally <3 m), with a patchy distribution. Nine facies are identified representing Miocene platform deposits (limestone gravel and blue-green clay facies), Pleistocene restricted marine deposits (lime mud facies), and Holocene back-barrier (organic muddy sand, olive-gray mud, and muddy sand facies) and open marine (well-sorted quartz sand, shelly sand, and black sand facies) deposits. Holocene back-barrier facies are separated from overlying open marine facies by a ravinement surface formed during the late Holocene rise in sea level. Facies associations are naturally divided into four discrete types. The pattern of distribution and ages of facies suggest that barrier islands developed approximately 8200 yr BP and in excess of 20 km seaward of the present coastline in the north, and more recently and nearer to their present position in the south. No barrier-island development prior to approximately 8200 yr BP is indicated. Initiation of barrier-island development is most likely due to a slowing in the Holocene sea-level rise ca. 8000 yr BP, coupled with the intersection of the coast with quartz sand deposits formed during Pleistocene sea-level highstands. This study is an example of a mixed carbonate/siliciclastic shallow marine depositional system that is tightly constrained in both time and sea-level position. It provides a useful analog for the study of other, similar depositional systems in both the modern and ancient rock record.
机译：从佛罗里达州中西部混合碳酸盐/硅质碎屑内架上收集沉积物颤动岩心和地表样品，以努力确定沿海屏障岛和邻近浅海环境的三维相结构和全新世地质发展。未固结的沉积物薄板很薄（通常<3 m），分布不规则。确定了9个相，分别代表中新世平台沉积物（石灰岩砾石和蓝绿色粘土相），更新世限制的海相沉积物（石灰泥相）和全新世后壁（有机泥质砂岩，橄榄灰色泥岩和泥质砂岩相）和露天海洋（分类合理的石英砂，贝壳砂和黑砂相）矿床。全新世后壁相与上覆开放海相通过全新世晚期海平面上升形成的沟谷面分开。相联系自然地分为四种离散类型。相的分布和年龄的格局表明，隔离岛发展了大约8200年BP，在北部目前海岸线的向海方向超过20公里，并且在最近和接近其南部的位置。没有显示在大约8200年BP之前没有障碍岛屿的发展。由于全新世海平面上升速度减缓，最有可能启动障壁岛发展。 8000年BP，再加上海岸与更新世海平面高台形成的石英砂沉积相交。这项研究是一个在时间和海平面位置都受到严格限制的碳酸盐/硅质碎屑混合浅海沉积系统的例子。它为研究现代和古代岩石记录中的其他类似沉积系统提供了有用的模拟。

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