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首页> 外文期刊>Quaternary geochronology >OSL dating of a carbonate island in the Chobe Enclave, NW Botswana
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OSL dating of a carbonate island in the Chobe Enclave, NW Botswana

机译：OSL在Chobe Candave，NW Botswana的碳酸群岛约会

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摘要

Carbonate platform islands are important landscape features in the northeastern part of the Okavango Delta region of Botswana, the Chobe Enclave. However, the formation processes and the timing of these "Chobe Islands" remain unclear. They are assumed to be the result of late Quaternary hydrological changes. Records of such changes are poorly preserved, though the occurrence of beach ridges in the Middle Kalahari Basin attests to the existence of large paleo-lakes in the past. Carbonate rocks from the Chobe Island appear to be relics of palustrine environments, but their relationship with the other hydrological archives is still unclear. Here, we report optically stimulated luminescence dating of key sedimentary beds in and around a single Chobe Island. It was necessary to model dose rate evolution for each sample individually, taking into account post-depositional changes in the sediment chemistry and its burial depth. The resulting ages suggest that the dated units were deposited between MIS6 to MIS1. The carbonate platform itself appears to have been deposited in two phases, separated by either an unexpectedly long (similar to 40 ka) depositional hiatus or an episode of erosion. This study demonstrates the potential of using luminescence dating in such settings, and offers the possibility of linking sedimentary processes within the Chobe Enclave to regional paleo-hydrological records.
机译：碳酸盐平台岛是博茨瓦纳Okavango Delta地区东北部的重要景观特征。然而，地层过程和这些“Chobe岛”的时间仍然不清楚。他们被认为是晚期水文变化的结果。这种变化的记录保存不佳，尽管哈哈里盆地中间海滩山脊的发生证明了过去古湖的存在。来自Chobe岛的碳酸盐岩石似乎是牙线环境的遗物，但与其他水文档案的关系仍然不清楚。在这里，我们报告了单个Chobe岛及其周围的光学刺激的发光约会。需要单独为每个样品进行模拟剂量率进化，考虑到沉积物化学和埋藏后的沉积后变化。由此产生的年龄表明，在MIS6到MIS1之间存放了日期的单位。碳酸盐平台本身似乎已分两看阶段沉积，以意外的长（类似于40ka）沉积的中断或侵蚀事件分开。本研究表明，在这种环境中使用发光约会的可能性，并提供将距离区域内的沉积过程连接到区域古水文记录中的可能性。

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