Salih M. Awadh, Zinah S. Al-Ankaz, Mohanad R. A. Al-Owaidi, John S. Armstrong-Altrin
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引用次数: 0
摘要
对位于纳杰夫-卡尔巴拉高原和巴士拉的晚中新世-上新世迪巴迪巴岩层的砂岩进行了研究,以确定它们的源岩和来源。这些砂岩中的稀土元素(REE)和微量元素(Sc、Co、V 和 Th)浓度显示,它们很可能来自单一来源。砂岩中陡峭的轻稀土元素(LREE)和平坦的重稀土元素(HREE)形态、负 Eu 异常以及高 ΣREE 含量表明,这些砂岩可能来自被动大陆边缘环境,并源于长英岩。ΣREE的平均浓度为百万分之93.5,低于上大陆地壳和后奥陶纪澳大利亚页岩等平均地壳成分。与 HREE 相比,LREE 所占比例较高,这意味着这些砂岩是被回收的,来源较远。Th/Co、Th/Sc、La/Sc、La/Co、Eu/Eu*和(La/Lu)cn元素比率表明,这些晚中新世-更新世砂岩来自阿拉伯地盾边缘地区的长英岩。
Provenance and depositional setting of the Late Miocene- Pleistocene clastic sediments in the eastern Arabian Peninsula and western Iraq using rare earth elements geochemistry
The sandstones of the Late miocene–Pliocene Dibdibba Formation in the Najaf–Karbala Plateau and Basra were examined to determine their source rocks and origin. The rare earth elements (REE) and trace elements (Sc, Co, V, and Th) concentrations in these sandstones revealed that they likely derived from a single source. The steep light rare earth elements (LREE) and flat, heavy rare earth element (HREE) patterns, negative Eu anomaly, and high ΣREE contents in sandstones suggest its derivation from a suggests that a passive continental margin environment and originated from felsic source rocks. The average concentration of ΣREE is 93.5 ppm, which is lower than that of the average crustal compositions like Upper Continental Crust and Post Archean Australian Shale. The higher proportion of LREE compared to HREE implies that these sandstones were recycled and derived from a distal source. The Th/Co, Th/Sc, La/Sc, La/Co, Eu/Eu* and (La/Lu)cn elemental ratios indicated that these Late Miocene–Pliocene sandstones were derived from felsic rocks located in the marginal region of the Arabian Shield.
期刊介绍:
Acta Geochimica serves as the international forum for essential research on geochemistry, the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth‘s crust, its oceans and the entire Solar System, as well as a number of processes including mantle convection, the formation of planets and the origins of granite and basalt. The journal focuses on, but is not limited to the following aspects:
• Cosmochemistry
• Mantle Geochemistry
• Ore-deposit Geochemistry
• Organic Geochemistry
• Environmental Geochemistry
• Computational Geochemistry
• Isotope Geochemistry
• NanoGeochemistry
All research articles published in this journal have undergone rigorous peer review. In addition to original research articles, Acta Geochimica publishes reviews and short communications, aiming to rapidly disseminate the research results of timely interest, and comprehensive reviews of emerging topics in all the areas of geochemistry.