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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Geochemical mapping of carbonate sediments in the Makgadikgadi basin, Botswana using moderate resolution remote sensing data
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Geochemical mapping of carbonate sediments in the Makgadikgadi basin, Botswana using moderate resolution remote sensing data

机译：博茨瓦纳Makgadikgadi盆地碳酸盐沉积物的地球化学测绘，使用中等分辨率的遥感数据

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This paper maps the carbonate geochemistry of the Makgadikgadi Pans region of northern Botswana from moderate resolution (500 m pixels) remotely sensed data, to assess the impact of various geomorphological processes on surficial carbonate distribution. Previous palaeo-environmental studies have demonstrated that the pans have experienced several highstands during the Quaternary, forming calcretes around shoreline embayments. The pans are also a significant regional source of dust, and some workers have suggested that surficial carbonate distributions may be controlled, in part, by wind regime. Field studies of carbonate deposits in the region have also highlighted the importance of fluvial and groundwater processes in calcrete formation. However, due to the large area involved and problems of accessibility, the carbonate distribution across the entire Makgadikgadi basin remains poorly understood. The MODIS instrument permits mapping of carbonate distribution over large areas; comparison with estimates from Landsat Thematic Mapper data show reasonable agreement, and there is good agreement with estimates from laboratory analysis of field samples. The results suggest that palaeo-lake highstands, reconstructed here using the SRTM 3 arc-second digital elevation model, have left behind surficial carbonate deposits, which can be mapped by the MODIS instrument. Copyright (c) 2006 John Wiley & Sons, Ltd.
机译：本文利用中等分辨率（500 m像素）遥感数据绘制了博茨瓦纳北部Makgadikgadi Pans地区的碳酸盐地球化学图，以评估各种地貌过程对表层碳酸盐分布的影响。先前的古环境研究表明，这些盆在第四纪期间经历了几次高潮，并在海岸线附近形成了碎屑。这些锅也是地区性的重要粉尘来源，一些工人建议，表面的碳酸盐分布可能部分受风势控制。该地区碳酸盐矿床的野外研究也突显了河流和地下水过程在钙质形成中的重要性。但是，由于涉及面积大和交通不便的问题，整个麦加迪卡迪盆地的碳酸盐分布仍然知之甚少。 MODIS仪器可以绘制大范围碳酸盐分布图。与Landsat Thematic Mapper数据的估计值的比较显示出合理的一致性，并且与实地样本的实验室分析的估计值具有很好的一致性。结果表明，这里使用SRTM 3弧秒数字高程模型重建的古湖高地已经遗留下了可以通过MODIS仪器测绘的表面碳酸盐矿床。版权所有（c）2006 John Wiley＆Sons，Ltd.

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