阿曼是埃迪卡拉纪东冈瓦纳的一个片段

Geology Pub Date : 2024-03-21 DOI:10.1130/g51989.1
Irene Gómez-Pérez, Andrew C. Morton, Hussam Al Rawahi, Dirk Frei
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摘要

阿曼埃迪卡拉纪砂岩的综合 U-Pb 粒锆石地质年代学表明,这些砂岩起源于新新生代基底,岩浆年龄峰值约为 850-780 Ma(托尼安纪),古生代和埃迪卡拉纪的岩浆来源较少,岩浆输入更新始于约 550 Ma。550 Ma。与来自阿拉伯-努比亚和西北印度盾的碎屑锆石比较,阿曼的埃迪卡拉纪演替与东冈瓦纳有亲缘关系。阿曼存在托尼安基底沉积物来源。较古老的古新生代锆石(约 2500 和 1800 马年)的来源没有在阿曼发现,但已知来自板块状印度盾。幼年阿拉伯-努比亚地盾的主要岩浆事件的信号(高峰期约为 640-620 Ma)在阿曼非常罕见。在阿曼的埃迪卡拉岩石演替中很少出现或根本没有出现。不过,阿曼西部出现了与阿拉伯-努比亚地盾相近的埃迪卡拉纪变形碎屑岩单元。最新埃迪卡拉纪-早期寒武纪锆石(550-525Ma)的流入被解释为与最终寒武纪安古丹/马达加斯加造山运动有关的岩浆活动所致。这些结果,连同阿曼西南部地下火山沉积地层的新年龄和地震观测结果,都支持这样的解释,即阿曼的埃迪卡拉纪演替是沿着莫桑比克洋东部(本文中的东部和西部是指今天的坐标)的大印度盾被动边缘沉积的。阿曼在寒武纪早期与阿拉伯-努比亚地盾相撞,当时安古丹/马达加斯加造山运动导致冈瓦纳最终合并。我们的数据支持这样的推论,即印度盾状地壳和阿拉伯盾状地壳之间最年轻和最后的缝合线位于早寒武世西部变形前沿的阿曼地表下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Oman as a fragment of Ediacaran eastern Gondwana
Comprehensive U-Pb detrital zircon geochronology of Ediacaran sandstones from Oman indicates that they originated from Neoproterozoic basement with a peak magmatic age of ca. 850−780 Ma (Tonian), with lesser Paleoproterozoic and Ediacaran sources and renewed magmatic input starting at ca. 550 Ma. Comparison with detrital zircons from the Arabian-Nubian and NW Indian Shields supports an eastern Gondwana affinity for the Ediacaran succession of Oman. Tonian basement sediment sources are present in Oman. Sources for older Paleoproterozoic zircons (ca. 2500 and 1800 Ma) are not found in Oman but are known from the cratonic Indian Shield. The signal of the main magmatic events of the juvenile Arabian-Nubian Shield, peaking at ca. 640−620 Ma, is rare or absent in the Ediacaran rock succession of Oman. However, deformed Ediacaran clastic units with an Arabian-Nubian Shield affinity occur in western Oman. Influx of latest Ediacaran−early Cambrian zircons (550−525 Ma) is interpreted as due to final Cambrian Angudan/Malagasy orogeny-related magmatism. These results, together with new ages for volcano-sedimentary terranes in the subsurface of SW Oman and seismic observations, support the interpretation that the Ediacaran succession of Oman was deposited along the western, passive margin of the Greater Indian Shield, on the eastern (east and west in this paper refer to present-day coordinates) side of the Mozambique Ocean. Oman then collided with the Arabian-Nubian Shield in the early Cambrian, when the Angudan/Malagasy orogeny led to final consolidation of Gondwana. Our data support the inference that the youngest and final suture between the Indian and Arabian Shields lies in the subsurface of Oman along the early Cambrian western deformation front.
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