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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 >Sedimentology and chemostratigraphy of the late Neoproterozoic carbonate ramp sequences of the Hüttenberg Formation (northwestern Namibia) and the C5 Formation (western central Democratic Republic of Congo): Record of the late post-Marinoan marine transgression on the margin of the Congo Craton
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Sedimentology and chemostratigraphy of the late Neoproterozoic carbonate ramp sequences of the Hüttenberg Formation (northwestern Namibia) and the C5 Formation (western central Democratic Republic of Congo): Record of the late post-Marinoan marine transgression on the margin of the Congo Craton

机译：Hüttenberg形成（纳米比亚西北部）和C5形成（刚果西部）：刚果克拉顿边疆后期玛利诺岛海外违法的记录

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摘要

The Neoproterozoic Marinoan climatic event corresponded to the Snowball Earth-type glaciation, and is commonly marked by the deposition of diamictites and by a negative carbon isotope anomaly. This event was followed by a sudden return to a greenhouse climate and a rapid post-glacial transgression with deposition of cap carbonates. Although the cap carbonates and marine carbonate sediments at the base of the post-glacial period are well known in the literature, few studies focused on the end of the marine transgression, which is a prelude to the Pan African Orogeny in Central Africa. In this paper, we present new descriptions of these carbonate rocks and a sedimentological study from key cores and outcrops in the Otavi Mountainland (Namibia) and West Congo belt (DRC) of the Hüttenberg Formation and the C5 Formation, respectively. Both successions show five main facies: (i) microbial 'mounds' and pinnacles; (ii) ooid-shoal barrier; (iii) evaporitic brackish lagoon; (iv) beach and (v) coastal sabkha. The Hüttenberg Formation consists of an open-marine mid-inner carbonate ramp setting including microbial mounds and pinnacles, and oolitic shoal-barrier islands. The C5 Formation exhibits a hypersaline inner carbonate ramp including an ooid shoal barrier, an evaporitic brackish lagoon, a beach and a coastal sabkha plain. Sedimentological, chemostratigraphical and biostratigraphical comparisons between the C5 and Hüttenberg formations suggest these are coeval carbonate shelf deposits on the margins of the Congo Craton, with a depositional age between 580 Ma and 540 Ma for both formations.
机译：Neoproterozoico Marinoan气候事件对应于雪球地球型冰川，并且通常是由敏化物和负碳同位素异常的沉积标记。随后，这一事件突然恢复到温室气候，并迅速冰川后迁移，沉积碳酸帽。虽然冰川后期后碳酸盖和海洋碳酸盐沉积物在文献中是众所周知的，但很少有研究在海洋违规的末尾集中，这是中非泛非洲orenogy的前奏。在本文中，我们展示了这些碳酸盐岩的新描述和奥特瓦伊山地（纳米比亚）和西刚果皮带（DRC）的关键核和露头的沉积学研究分别分别为Hüttenberg形成和C5形成。两次演习都显示了五个主要相：（i）微生物的“土墩”和石峰; （ii）黄液屏障; （iii）蒸发咸泻湖; （iv）海滩和（v）沿海萨布哈。 Hüttenberg形成包括开放式中内碳酸纤维坡道，包括微生物土墩和尖峰，以及鲕粒浅滩岛。 C5形成表现出纯碳酸盐碎屑，包括一块蒸发浅泻湖，海滩和沿海Sabkha平原。 C5和Hüttenberg地层之间的沉积学，化疗和生物数据学比较表明这些是刚果克拉顿的边缘的辅助碳酸盐架沉积物，两种形成的沉积年龄在580 mA和540 mA之间。

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