The thick Phanerozoic sedimentary cover lying above the Arabian Platform conceals extensive basement between the western Neoproterozoic domains of the Arabian Nubian Shield (ANS) and of the eastern Omani basement. The Neoproterozoic rocks entrained within salt domes that crop out within the United Arab Emirates (UAE) and Qatar are the only direct samples that allow us to investigate the tectonic history of the concealed Arabian basement domains before c. 550 Ma. This study focuses on the U-Pb geochronological and REE geochemical analysis of detrital zircon, apatite, titanite and rutile grains from the Zirku turbidites brought to the surface by halokinetic movements offshore UAE. These data are compared with new U-Pb and REE data from detrital heavy minerals of three metasedimentary members of the Omani Neoproterozoic Hatat Formation collected in the Saih Hatat window. The Omani metasedimentary units yield detrital titanite, zircon and apatite U–Pb ages that span from c. 2500 to 690 Ma, with an age maxima at c. 850 Ma, while the UAE unit yield ages from c. 2550 to 550 Ma with major age peaks at c. 1000, 820, 650 Ma. The analysis of the Omani stratigraphic sequence in the Saih Hatat window revealed that the rocks of the Neoproterozoic Hatat Formation yield similar age distributions of the Abu Mahara Group (lower Huqf Supergroup, exposed in central and southern Oman), and that the REE geochemical composition of the Hatat detrital apatite grains shares akin REE signature with the c. 550 detrital apatite of the Zirku Formation, with both being sourced from volcanic-arcs. These new geochronological and geochemical data, together with recent geophysical evidences, suggest that the basement of the UAE is originally part of the Oman tectonic domain and evolved as part of a volcanic-arc in an active margin at c. 550 Ma, which we interpret as part of the -arc of the Cadomian collision in between the Arabian and the Cadomian Taurides, Iran and Afghanistan terranes.

中文翻译：

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埃迪卡拉晚期阿拉伯东部基底（约 550 Ma）的构造背景：来自阿曼和阿拉伯联合酋长国基底的新地质年代学和地球化学约束


阿拉伯地台上方厚厚的显生宙沉积盖层掩盖了阿拉伯努比亚地盾（ANS）西部新元古代域和阿曼东部基底之间的广阔基底。阿拉伯联合酋长国（阿联酋）和卡塔尔境内出露的盐丘中夹带的新元古代岩石是唯一能够让我们研究公元 10 年前隐藏的阿拉伯基底域构造历史的直接样本。 550马。本研究重点对阿联酋近海卤代运动带到地表的 Zirku 浊积岩中的碎屑锆石、磷灰石、钛矿和金红石颗粒进行 U-Pb 年代学和 REE 地球化学分析。这些数据与在 Saih Hatat 窗口收集的阿曼新元古代 Hatat 地层三个变沉积岩成员的碎屑重矿物的新 U-Pb 和 REE 数据进行了比较。阿曼变沉积岩单元产生碎屑钛矿、锆石和磷灰石 U-Pb 年龄从 c. 2500 至 690 Ma，最大年龄为 c。 850 Ma，而阿联酋单位的产量年龄为 c. 2550 至 550 Ma，主要年龄峰值在 c。 1000、820、650 Ma。 Saih Hatat 窗口中阿曼地层序列的分析表明，新元古代 Hatat 组的岩石具有与 Abu Mahara 群（下 Huqf 超群，暴露在阿曼中部和南部）相似的年龄分布，并且Hatat 碎屑磷灰石颗粒与 c 具有类似的 REE 特征。 550 颗来自 Zirku 地层的碎屑磷灰石，两者均来自火山弧。 这些新的地质年代学和地球化学数据，以及最近的地球物理证据表明，阿联酋的基底最初是阿曼构造域的一部分，并演化为约 100 年前活动边缘火山弧的一部分。 550 Ma，我们将其解释为阿拉伯金牛座和卡多米金牛座、伊朗和阿富汗地体之间卡多米亚碰撞弧的一部分。