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Glacial-to-Holocene sedimentation on the western slope of Great Bahama Bank

机译：大巴哈马银行西坡的冰川-全新世沉积

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摘要

Thick, late Quaternary sediment sections were recovered at several sites on the leeward slope of Great Bahama Bank during Leg 166 of the Ocean Drilling Program. These sections have paleoceanographic records with potentially high temporal resolution. To make an initial assessment of the records corresponding to the Holocene highstand of sea level, we have identified and dated the sediments from the four upper slope sites (1004, 1005, 1008, and 1009) that were deposited during the period of time which spans the last glaciation through the Holocene. Age identifications are based upon the abundances of the Globorotalia menardii complex of planktonic foraminifera, the stable oxygen isotopic ratios of bulk sediment and the planktonic foraminifera Globogerinoides ruber, and AMS C- 14 dating of bulk sediment. Comparison of these data with the sediment lithologic and geoacoustic properties shows that consistent stratigraphic relationships exist at each site: The uppermost interval of aragonite-rich sediments corresponds to the Holocene highstand of sea level (i.e. oxygen isotope stage 1) and these sediments are underlain by a relatively thin interval of aragonite-poor, partially lithified sediments which corresponds to the last glaciation when sea level was significantly lower than today (i.e. oxygen isotope stages 2-4). The Leg 166 upper slope sites possess carbonate accumulation and paleoceanographic proxy records with very high temporal resolution, with Sites 1004, 1008, and 1009 appearing to have the greatest stratigraphic integrity. Comparison of core and high-resolution seismic profile data establishes the Holocene nature of the uppermost seismic unit in the stratigraphic package of the western slope of Great Bahama Bank.
机译：在海洋钻探计划的第166条航程中，在大巴哈马河岸的背风斜坡上的多个地点回收了较厚的第四纪晚期沉积物。这些部分具有古海洋学记录，可能具有较高的时间分辨率。为了对与全新世海平面相对应的记录进行初步评估，我们已经确定并标出了在这段时期内沉积的来自四个上斜坡站点（1004、1005、1008和1009）的沉积物并标出了日期通过全新世的最后一次冰期。年龄的确定是基于浮游有孔虫的Globorotalia menardii复合体的丰度，散装沉积物和浮游有孔虫Globogerinoides ruber的稳定氧同位素比以及散装沉积物的AMS C-14年代。这些数据与沉积物的岩性和地声性质的比较表明，每个位置都存在一致的地层关系：富含文石的沉积物的最上层间隔对应于全新世海平面（即氧同位素第1阶段），这些沉积物是由当海平面显着低于今天（即氧同位素2-4阶段）时，相对较稀疏的文石，部分石化的沉积物间隔相对应，这对应于最后一次冰川期化。腿部166上斜坡站点拥有碳酸盐岩的堆积和古海洋学的代理记录，具有很高的时间分辨率，站点1004、1008和1009似乎具有最大的地层完整性。岩心和高分辨率地震剖面数据的比较确定了大巴哈马银行西坡地层中最上层地震单元的全新世性质。

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