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Sea-level, storms, and sedimentation – Controls on the architecture of the Andros tidal flats (Great Bahama Bank)
Sedimentary Geology ( IF 2.7 ) Pub Date : 2021-05-06 , DOI: 10.1016/j.sedgeo.2021.105932
Mingyue Wu , Paul (Mitch) Harris , Gregor Eberli , Sam J. Purkis

Integrated time-separated remote sensing, geographic information systems (GIS), microbiology, and carbonate sedimentology of the tidal-flat portion of Andros Island (Great Bahama Bank) quantify the geomorphologic change of tidal-flat facies through time and illustrate how sea-level rise, among other controls, is recorded within these deposits. In the 75 years spanned by the remote-sensing datasets, sea level has risen by approximately 10 cm. In the face of this change: a) the seaward margin of the tidal flats has remained static, while b) the internal boundary, which separates the channelized and supratidal marsh deposits, retrograded up to 220 m, broadening the channelized zone, and c) in unison to the broadening of the channelized zone, the abundance of laminated (Scytonema) cyanobacterial fabrics decreased, d) accompanied by the lengthening and avulsion of the network of tidal channels that traverse this zone. Given the amount of sea level rise during the period of observation, such broad-scale restructuring of the Andros tidal-flat architecture is surprising. The muddy tidal flats did not prograde, but instead aggraded and locally retrograded. Whereas retrogradation was minimal at the coastline, the channelized zone retrograded substantially over the more landward supratidal inland marsh. These results question aspects of the autocyclic model for the development of peritidal carbonate cycles, which is underpinned by a dominant behavior of tidal-flat progradation. Whereas other controls cannot be explicitly excluded, sea-level oscillations seemingly exerted considerably more impact on the Andros tidal flat in the last decades than did major storm events.



中文翻译:

海平面,风暴和沉积物-对安德罗斯(Andros)滩涂建筑的控制(大巴哈马银行(Great Bahama Bank))

安德罗斯岛(大巴哈马银行)潮滩部分的综合分时遥感,地理信息系统(GIS),微生物学和碳酸盐沉积学,定量分析了潮滩相随时间的地貌变化,并说明了海平面如何除其他控制措施外,这些存款中还记录了涨幅。在由遥感数据集跨越的75年中,海平面上升了约10厘米。面对这种变化:a)滩涂的向海边缘保持不变,而b)内部边界将沟渠化的和沼泽上的沼泽沉积物分开,回溯至220 m,拓宽了沟渠化的区域,以及c)与通道化区域的扩大一致,层状(胞浆瘤)蓝藻织物减少,d)伴随横穿该区域的潮汐通道网络的延长和撕脱。考虑到观测期间海平面上升的幅度,对安德罗斯(Andros)滩涂建筑进行如此大规模的改建是令人惊讶的。泥泞的滩涂并没有恶化,反而恶化了,并局部地退化了。海岸线上的逆行作用极小,而通道化区域在陆上的上滨内陆沼泽上却大大逆行。这些结果质疑了潮汐碳酸盐循环的发展的自循环模型的各个方面,而潮汐扁平化的主要行为为其提供了支撑。尽管不能明确排除其他控件,

更新日期:2021-05-15
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