A composite stratigraphy for the Neoproterozoic Huqf Supergroup of Oman: integrating new litho-, chemo- and chronostratigraphic data of the Mirbat area, southern Oman
A composite stratigraphy for the Neoproterozoic Huqf Supergroup of Oman: integrating new litho-, chemo- and chronostratigraphic data of the Mirbat area, southern Oman
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DOI：
10.1144/0016-76492006-114
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发表时间：
2007-08
影响因子：
2.7
通讯作者：
R. Rieu;P. Allen;A. Cozzi;J. Košler;F. Bussy
中科院分区：
文献类型：
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作者：
R. Rieu;P. Allen;A. Cozzi;J. Košler;F. Bussy
位于阿曼的胡克夫超群保存了非常完整的新元古代中晚期沉积记录。在阿曼北方和中部的Huqf超群的露头，现在有很好的记录，但其相关性的一个关键的继承在阿曼南部的米尔巴特地区，包含两个新元古代冰川的沉积记录，知之甚少。综合岩石地层学、化学地层学和新的U-Pb碎屑锆石数据表明，米尔巴特群最好位于低温纪（c. 850-635 Ma），是Huqf超群的一部分。梭1公里厚的海洋沉积物的Arkahawl和Marsham组的米尔巴特集团被认为是代表地层之间的间隔较老的Cryogenian和较年轻的Cryogenian冰川，没有保存在阿曼的其他地方。胡夫超群中的碎屑锆石主要来自新元古代母岩。然而，更古老的中元古代，古元古界，甚至是早白垩世的锆石可以在上马哈拉群（Fiq组）和纳丰群的碎屑岩群中识别出来，这表明外来源的挖掘，可能来自阿拉伯-努比亚地盾。
The Huqf Supergroup in Oman contains an exceptionally well-preserved and complete sedimentary record of the Middle to Late Neoproterozoic Era. Outcrops of the Huqf Supergroup in northern and central Oman are now well documented, but their correlation with a key succession in the Mirbat area of southern Oman, containing a sedimentary record of two Neoproterozoic glaciations, is poorly understood. Integration of lithostratigraphic, chemostratigraphic and new U–Pb detrital zircon data suggests that the Mirbat Group is best placed within the Cryogenian (c. 850–635 Ma) part of the Huqf Supergroup. The c. 1 km thick marine deposits of the Arkahawl and Marsham Formations of the Mirbat Group are thought to represent a stratigraphic interval between older Cryogenian and younger Cryogenian glaciations that is not preserved elsewhere in Oman. The bulk of detrital zircons in the Huqf Supergroup originate from Neoproterozoic parent rocks. However, older Mesoproterozoic, Palaeoproterozoic and even Archaean zircons can be recognized in the detrital population from the upper Mahara Group (Fiq Formation) and Nafun Group, suggesting the tapping of exotic sources, probably from the Arabian–Nubian Shield.