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首页> 外文期刊>South African Journal of Geology: Being the Transaction of the Geological Society of South African: Syndie die Verhandelinge van die Geologiese Vereniging van Suid-Afrika >The lithostratigraphy of the Riverton Formation, South Africa
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The lithostratigraphy of the Riverton Formation, South Africa

机译：南非罗芒龙岩石形成的岩石图书馆

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摘要

The Riverton Formation occurs intermittently along the banks of the lower Harts, Vaal, Riet and middle Orange Rivers in the Northern Cape Province. These alluvial terrace deposits represent a complex history of sedimentary sequences that are stacked upon older deposits with crosscutting or onlapping relationships and display varying degrees of pedogenic overprinting. These cut-and-fill alluvial and colluvial sands and silts include subordinate interbedded gravel layers and lenses and buried palaeosols with vertic pedogenic characteristics. The deposits occur lower than 17 m above the present river bed or in erosional gullies/dongas up to 20 m above the present river channel, far below the older and higher Wedburg and Proksch Koppie terraces. The formation reaches a maximum thickness of 37 m at the Riverton type area southeast of Barkly West. Middle and Late Stone Age artefacts indicate an age range from the Late Pleistocene to Holocene. Alternating alluvial deposition and minor incision with pedogenesis of the Riverton Formation indicates complex environmental fluctuations over a long time period after deposition of the older, underlying Rietputs Formation gravels. This period of aggradation within alluvial channels and floodplains indicates a general reduction in catchment discharge of rivers in the summer rainfall region and conforms to the progressive drying of the southern African climate ~1.2 Ma (Gibbon, 2009).
机译：Riverton Checulation沿着北开普省北部的霍尔特，Vaal，Riet和Middle Organ rivers河岸间歇地发生。这些冲积露台沉积物代表了沉积序列的复杂历史，其堆叠在较旧的沉积物上，伴随的横切或展开关系并显示不同程度的基础叠印。这些切割和填充的冲积和抗菌砂和淤泥包括从属楔形的砾石层和镜片，并掩埋古糖，具有Vertic的基础特性。存款出现在当前河床或侵蚀沟/东上方的17米以上，高达20米以上的河流通道高达20米，远低于较旧的和更高的婚礼和高级赛道和Proksch Koppie露台。在巴克斯西东南部的Riverton类型的区域，该形成占37米的最大厚度。中半年和后期石头时代的人工制品表示从晚熟到全新世的年龄范围。交替的冲积沉积和抗钻孔形成的次要切口，表明较旧的依赖于较旧的征兵形成砾石后长时间的复杂环境波动。在夏季降雨区内河流集水区集水区排放的一般减少，并符合南方非洲气候的进步干燥〜1.2马（长臂猿，2009）。

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