Discerning sediment provenance in the Outer Banks (USA) through detrital zircon geochronology

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Marine Geology Pub Date : 2024-10-05 DOI:10.1016/j.margeo.2024.107409
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Abstract

Detrital zircon data from modern barrier island and estuarine environments in the Outer Banks (Atlantic Coast, USA) were statistically compared to sands from nearby rivers to assist in determining source-to-sink pathways. Fluvial samples, collected from near the Fall Line contact between the Appalachian Orogen and sediments of the coastal plain, all have age unique distributions, making them ideal for tracing provenance. Three samples from the Atlantic foreshore showed high similarities to one another, as well as to three samples from the estuarine (back-barrier) Pamlico and Albemarle Sounds. Mixture modeling with multiple data reduction methods and three different statistical tests for similarity consistently indicated that the nearby Potomac River was the primary source for all Atlantic foreshore and estuarine zircons, followed by minor contributions from the James River in some models. The models indicate little or no sediment contribution from the Susquehanna, Roanoke, Tar, Neuse, Cape Fear, and Peedee Rivers. Both Atlantic foreshore and estuarine sands are therefore interpreted to have initially originated from Appalachian bedrock to the north of their present-day location, and subsequently to have been transported southward through the Chesapeake Bay watershed before deposition in Virginia and North Carolina. Prior to barrier island formation in the last several thousand years, differing geomorphology of the Chesapeake Bay facilitated southward movement of sediments from its constituent rivers via longshore drift, where they were deposited in coastal settings on the mainland. The modern barrier islands, formed during the most recent post-glacial transgression, may be reworked from these deposits, but may also include a contribution from sediments that were derived more recently from relict deposits on the shelf. Oceanographic and sedimentological evidence suggests that movement of sand-sized grains from southern rivers across the back-barrier sounds is unlikely. These findings can assist with coastal resilience planning and resource management in a region under severe threat from climate change and rising sea levels.
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通过碎屑锆石地质年代学辨别外滩(美国)的沉积物出处
将外滩(美国大西洋沿岸)现代屏障岛和河口环境中的碎屑锆石数据与附近河流的泥沙进行了统计比较,以帮助确定从源到汇的途径。从阿巴拉契亚造山带与沿海平原沉积物之间的瀑布线接触点附近采集的冲积样品都具有独特的年龄分布,因此非常适合追踪来源。来自大西洋前滨的三个样本彼此高度相似,与来自帕姆利科湾和阿尔贝马勒湾河口(后障)的三个样本也高度相似。采用多种数据还原方法和三种不同的相似性统计检验方法建立的混合模型一致表明,附近的波托马克河是所有大西洋前滨和河口锆石的主要来源,在某些模型中,詹姆斯河也是其次。这些模型表明,来自苏斯克汉纳河、罗阿诺克河、塔尔河、纽斯河、费尔角河和皮迪河的沉积物很少或没有。因此,大西洋前滨沙和河口沙最初都被解释为源自其现今位置以北的阿巴拉契亚基岩,随后通过切萨皮克湾流域向南漂移,最后沉积在弗吉尼亚州和北卡罗来纳州。在过去几千年障碍岛形成之前,切萨皮克湾不同的地貌使其组成河流的沉积物通过沿岸漂移向南移动,沉积在大陆的沿岸环境中。现代屏障岛形成于最近的冰川后大断裂时期,可能是由这些沉积物再加工而成,但也可能包括最近从陆架上的孑遗沉积物中提取的沉积物。海洋学和沉积学的证据表明,来自南部河流的沙粒不大可能穿过背障声带。这些发现有助于在一个受到气候变化和海平面上升严重威胁的地区进行海岸复原规划和资源管理。
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来源期刊
Marine Geology
Marine Geology 地学-地球科学综合
CiteScore
6.10
自引率
6.90%
发文量
175
审稿时长
21.9 weeks
期刊介绍: Marine Geology is the premier international journal on marine geological processes in the broadest sense. We seek papers that are comprehensive, interdisciplinary and synthetic that will be lasting contributions to the field. Although most papers are based on regional studies, they must demonstrate new findings of international significance. We accept papers on subjects as diverse as seafloor hydrothermal systems, beach dynamics, early diagenesis, microbiological studies in sediments, palaeoclimate studies and geophysical studies of the seabed. We encourage papers that address emerging new fields, for example the influence of anthropogenic processes on coastal/marine geology and coastal/marine geoarchaeology. We insist that the papers are concerned with the marine realm and that they deal with geology: with rocks, sediments, and physical and chemical processes affecting them. Papers should address scientific hypotheses: highly descriptive data compilations or papers that deal only with marine management and risk assessment should be submitted to other journals. Papers on laboratory or modelling studies must demonstrate direct relevance to marine processes or deposits. The primary criteria for acceptance of papers is that the science is of high quality, novel, significant, and of broad international interest.
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