Provenance and depositional setting of the Late MiocenePleistocene clastic sediments in the eastern Arabian Peninsula and western Iraq using rare earth elements geochemistry  

作　　者：Salih M.Awadh Zinah S.Al-Ankaz Mohanad R.A.Al-Owaidi John S.Armstrong-Altrin 

机构地区：[1]Department of Geology,College of Science,University of Baghdad,Baghdad,Iraq [2]Department of Geology,College of Science,University of Wasit,Wasit 52011,Iraq [3]Department of Applied Geology,College of Science,University of Babylon,Babylon 51001,Iraq [4]Unidad de Procesos Oceanicos y Costeros,Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autonoma de Mexico,Ciudad Universitaria,04510 Mexico City,CDMX,Mexico [5]Department of Marine Sciences,Bharathidasan University,Tiruchirapalli,Tamil Nadu 620024,India

出　　处：《Acta Geochimica》2024年第2期399-410,共12页地球化学学报（英文）

摘　　要：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.

关 键 词：REE Dibdibba formation Clastic sediments Passive continental margin 

分 类 号：P512.2[天文地球—地质学] P534.6P595