The sedimentary record of palaeoenvironments and sea-level change in the Gulf of Carpentaria, Australia, through the last glacial cycle
The sedimentary record of palaeoenvironments and sea-level change in the Gulf of Carpentaria, Australia, through the last glacial cycle
复制标题
DOI：
10.1016/j.quaint.2007.11.019
复制
发表时间：
2008-05
影响因子：
2.2
通讯作者：
J. Reeves;A. Chivas;Adriana García;S. Holt;Martine Couapel;B. Jones;D. Cendón;D. Fink
中科院分区：
文献类型：
--
作者：
J. Reeves;A. Chivas;Adriana García;S. Holt;Martine Couapel;B. Jones;D. Cendón;D. Fink
卡奔塔利亚海湾地区，世界上最大的热带陆表海航道，通过末次冰期循环的环境演变已确定从一系列的六个沉积物芯。这些岩芯构成了多学科研究的重点，以阐明该地区的海平面、气候和环境变化。沉积记录揭示了一系列相，包括开放浅海，边缘海，河口湾，湖泊和陆上暴露，在整个范围内的盆地在这一时期。中央海盆部分或完全与海洋沃茨隔绝，是由于海平面下降到海湾边界的一个或两个岩床以下--西面的阿拉弗拉岩床（低于现在海平面53米）和东面的托雷斯海峡（低于现在海平面12米）。这些关闭的范围和时间，以及对浅水水体的限制，是当地海洋环流、可用潜热输送以及澳大利亚和新几内亚之间的人和动物流动所固有的。虽然发生的古湖Carpentaria先前已被确定，本研究扩大了湖泊相的水文条件，并延长记录通过末次间冰期，详细介绍了以前的海平面高位（MIS 5.5）和随后的撤退。当海平面在MIS 6冰期低，海湾主要是subaerially暴露和蜿蜒的河流穿越。MIS 5海侵（约130 kaBP）导致了海洋-河口环境的交替，直到MIS 4（约70 kaBP），此时一个长期的湖泊阶段，盐度和深度/面积变化，包括接近干燥的时期，持续到约12.2kaBP。在14 kaBP澳大利亚季风的加强/恢复之后，湖泊扩大到接近最大规模（约190000 km 2）。这一湖满阶段是短暂的，因为到12.2calka BP，海洋沃茨进入盆地，与海平面的逐步上升相一致。约10.5calka BP，通过向西与阿拉弗拉海（印度洋）的连接，完全恢复了海洋条件，而与太平洋（珊瑚海）的连接直到约8 calka BP才出现。
Environmental evolution of the Gulf of Carpentaria region, the world's largest tropical epicontinental seaway, through the last glacial cycle has been determined from a series of six sediment cores. These cores form the focus of a multi-disciplinary study to elucidate sea level, climate and environmental change in the region. The sedimentary record reveals a series of facies including open shallow marine, marginal marine, estuarine, lacustrine and subaerial exposure, throughout the extent of the basin during this period. The partial or complete closure of the central basin from marine waters results from sea level falling below the height of one or both of the sills that border the Gulf—the Arafura Sill to the west (53m below present sea level (bpsl)) and Torres Strait to the east (12m bpsl). The extent and timing of these closures, and restriction of the shallow waterbody within, are intrinsic to local ocean circulation, available latent heat transport and the movement of people and animals between Australia and New Guinea. Whilst the occurrence of the palaeo-Lake Carpentaria has previously been identified, this study expands on the hydrological conditions of the lacustrine phases and extends the record through the Last Interglacial, detailing the previous sea-level highstand (MIS 5.5) and subsequent retreat. When sea levels were low during the MIS 6 glacial period, the Gulf was largely subaerially exposed and traversed by meandering rivers. The MIS 5 transgression (∼130kaBP) led to marine then alternating marine/estuarine conditions through to MIS 4 (∼70ka BP) when a protracted lacustrine phase, of varying salinity and depth/area, and including periods of near desiccation, persisted until about 12.2calka BP. The lake expanded to near maximum size (∼190000km2) following the intensification/restoration of the Australian monsoon at 14ka BP. This lake-full phase was short-lived, as by 12.2calka BP, marine waters were entering the basin, coincident with the progressive sea-level rise. Fully marine conditions were restored by about 10.5calka BP by westward connection to the Arafura Sea (Indian Ocean), whereas connections to the Pacific Ocean (Coral Sea) did not occur until about 8calka BP.