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Detrital zircon provenance of north Gondwana Palaeozoic sandstones from Saudi Arabia
Geological Magazine ( IF 2.3 ) Pub Date : 2020-06-24 , DOI: 10.1017/s0016756820000576
Guido Meinhold , Alexander Bassis , Matthias Hinderer , Anna Lewin , Jasper Berndt

We present the first comprehensive detrital zircon U–Pb age dataset from Palaeozoic sandstones of Saudi Arabia, which provides new insights into the erosion history of the East African Orogen and sediment recycling in northern Gondwana. Five main age populations are present in varying amounts in the zircon age spectra, with age peaks at 625 Ma, 775 Ma, 980 Ma, 1840 Ma and 2480 Ma. Mainly igneous rocks of the Arabian–Nubian Shield are suggested to be the most prominent sources for the Ediacaran to middle Tonian zircon grains. Palaeoproterozoic and Archaean grains may be xenocrystic zircons or they have been recycled from older terrigenous sediment. A primary derivation from Palaeoproterozoic and Archaean basement is also possible, as rocks of such age occur in the vicinity. Approximately 4 % of the detrital zircons show Palaeozoic (340–541 Ma) ages. These grains are likely derived from Palaeozoic post-orogenic and anorogenic igneous rocks of NE Africa and Arabia. A few single grains gave up to Eoarchaean (3.6–4.0 Ga) ages, which are the oldest zircons yet described from Arabia and its vicinity. Their origin, however, is yet unknown. Detrital zircons with U–Pb ages of 1.0 Ga are present in varying amounts in all of the samples and are a feature of terrigenous sediment belonging to the Gondwana super-fan system with an East African – Arabian zircon province.

中文翻译:

沙特阿拉伯北部冈瓦纳古生界砂岩碎屑锆石物源

我们提出了来自沙特阿拉伯古生代砂岩的第一个综合碎屑锆石 U-Pb 年龄数据集,该数据集为东非造山带的侵蚀历史和冈瓦纳北部的沉积物循环提供了新的见解。锆石年龄光谱中存在五个主要年龄群体,其年龄峰值在 625 Ma、775 Ma、980 Ma、1840 Ma 和 2480 Ma。阿拉伯-努比亚地盾的主要火成岩被认为是埃迪卡拉纪到中托尼纪锆石颗粒的最重要来源。古元古代和太古代的颗粒可能是异晶锆石,或者它们是从较旧的陆源沉积物中回收的。来自古元古代和太古代基底的主要推导也是可能的,因为这种年龄的岩石出现在附近。大约 4% 的碎屑锆石显示出古生代 (340–541 Ma) 年龄。这些颗粒很可能来自非洲东北部和阿拉伯地区的古生代后造山和造山火成岩。一些单一的晶粒放弃了始太古代(3.6-4.0 Ga)年龄,这是迄今为止在阿拉伯及其附近地区描述的最古老的锆石。然而,它们的起源尚不清楚。U-Pb 年龄为 1.0 Ga 的碎屑锆石在所有样品中都存在不同的数量,并且是属于东非 - 阿拉伯锆石省的冈瓦纳超级扇系统的陆源沉积物的特征。
更新日期:2020-06-24
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