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Detrital zircon and rutile U–Pb, Hf isotopes and heavy mineral assemblages of Israeli Miocene sands: Fingerprinting the Arabian provenance of the Levant
Basin Research ( IF 2.8 ) Pub Date : 2021-01-17 , DOI: 10.1111/bre.12544
Navot Morag 1 , Dov Avigad 2 , Axel Gerdes 3 , Avishai Abbo 2
Affiliation  

Isolated, Miocene continental basins scattered over Israel and Jordan represent the remnants of a continental-wide fluvial system, which originated in Arabia and transported siliciclastic sediments westward to the deep Levant Basin. These basins define two geographically separated sedimentary provinces. The detrital zircon age spectra in both provinces are dominated by Neoproterozoic U-Pb ages (550–1,000 Ma), resembling those of Paleozoic-Mesozoic sandstones exposed along the uplifted Red Sea Rift flank. However, while the southern province exhibits two prominent peaks at ~600 and ~1,000 Ma, similar to those seen in Cambrian-Ordovician sandstones in southern Israel and Jordan, the northern province shows an additional significant age peak at ~800 Ma and its overall spectrum resembles that of Devonian sandstones in northern Saudi Arabia. These variations distinguish the two Miocene clastic outliers as pertaining to two separate, NW-directed transport systems delivering siliciclastic sediments from Arabia towards the deep Levant Basin. The detrital zircon U-Pb-Hf signal of the Israeli Miocene clastic units differs from that of the River Nile, particularly in the lack of Cenozoic-Mesozoic-aged zircons in the former. This allows us to distinguish the properties of the fluvial system that existed in Arabia, on the eastern side of the Red Sea, from that of the River Nile that drained its western flanks. While it is commonly accepted that the (proto-)Nile River played a key role in the Levant Basin fill, the eastern fluvial system that prevailed on the Arabian side may have been also important.

中文翻译:

以色列中新世砂岩的碎屑锆石和金红石U-Pb,Hf同位素和重矿物组合:指纹识别黎凡特的阿拉伯来源

孤立的中新世大陆盆地遍布以色列和约旦,代表了整个大陆河流系统的残余,该河流系统起源于阿拉伯并将硅质碎屑沉积物向西输送到黎凡特盆地深处。这些盆地定义了两个地理上分开的沉积省。两个省的碎屑锆石年龄谱由新元古代U-Pb年龄(550-1,000 Ma)所控制,类似于沿隆起的红海裂谷侧面暴露的古生代-中生代砂岩。然而,尽管南部省份在〜600和〜1,000 Ma处出现两个突出的峰值,类似于在以色列南部和约旦的寒武纪-奥陶纪砂岩中看到的峰值,但北部省份在〜800 Ma及其整体频谱上显示出另一个明显的年龄峰值。类似于沙特阿拉伯北部的泥盆纪砂岩。这些变化将两个中新世碎屑异常区分开来,属于两个独立的,西北方向的传输系统,这些传输系统将硅质碎屑从阿拉伯运往黎凡特深盆地。以色列中新世碎屑岩的碎屑锆石U-Pb-Hf信号不同于尼罗河,特别是前者缺乏新生代-中生代年龄的锆石。这使我们能够区分存在于红海东部阿拉伯半岛的河流系统的特性与流尽其西部侧面的尼罗河的特性。尽管人们普遍认为(原始)尼罗河在黎凡特盆地填充中起着关键作用,但阿拉伯一方普遍存在的东部河流系统也可能很重要。NW导向的输送系统将硅质碎屑从阿拉伯运往黎凡特盆地深处。以色列中新世碎屑岩的碎屑锆石U-Pb-Hf信号不同于尼罗河,特别是前者缺乏新生代-中生代年龄的锆石。这使我们能够区分存在于红海东部阿拉伯半岛的河流系统的特性与流尽其西部侧面的尼罗河的特性。尽管人们普遍认为(原始)尼罗河在黎凡特盆地填充中起着关键作用,但阿拉伯一方普遍存在的东部河流系统也可能很重要。由西北方向的运输系统将硅质沉积物从阿拉伯运往黎凡特盆地深处。以色列中新世碎屑岩的碎屑锆石U-Pb-Hf信号不同于尼罗河,特别是前者缺乏新生代-中生代年龄的锆石。这使我们能够区分存在于红海东部阿拉伯半岛的河流系统的特性与流尽其西部侧面的尼罗河的特性。尽管人们普遍认为(原始)尼罗河在黎凡特盆地填充中起着关键作用,但阿拉伯一方普遍存在的东部河流系统也可能很重要。以色列中新世碎屑岩的碎屑锆石U-Pb-Hf信号不同于尼罗河,特别是前者缺乏新生代-中生代年龄的锆石。这使我们能够区分存在于红海东部阿拉伯半岛的河流系统的特性与流尽其西部侧面的尼罗河的特性。尽管人们普遍认为(原始)尼罗河在黎凡特盆地填充中起着关键作用,但阿拉伯一方普遍存在的东部河流系统也可能很重要。以色列中新世碎屑岩的碎屑锆石U-Pb-Hf信号不同于尼罗河,特别是前者缺乏新生代-中生代年龄的锆石。这使我们能够区分存在于红海东部阿拉伯半岛的河流系统的特性与流尽其西部侧面的尼罗河的特性。尽管人们普遍认为(原始)尼罗河在黎凡特盆地填充中起着关键作用,但阿拉伯一方普遍存在的东部河流系统也可能很重要。
更新日期:2021-01-17
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