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• W2019418903 abstract "The 200 km wide Tuludimtu Belt of Western Ethiopia is one of a series of N-S trending Neoproterozoic orogenic belts of the East African Orogenic Province in southeastern Sudan and western and southern Ethiopia. The Tuludimtu Belt consists of deformed greenschist facies metasediments and metavolcanics, flanked to the east and west by gneissic terranes, all of which are invaded by pre-, syn- and post-tectonic intrusives ranging from ultramafic to felsic in composition. The Tuludimtu Belt has been subdivided into five lithotectonic domains, from east to west, the Didesa, Kemashi, Dengi, Sirkole and Daka Domains. On the basis of lithological associations, the three domains in the core of the belt, the Kemashi, Dengi and Sirkole Domains, are respectively interpreted to represent an ophiolitic terrane of oceanic crustal origin, a volcanic arc, and a fold-thrust terrane composed of interleaved thrust sheets of gneissic basement and cover strata. The Didesa and Daka Domains are composed of moderate- to high-grade gneisses, possibly representing the basement forelands to the belt. Major and trace element geochemistry for metavolcanics of predominantly basaltic and andesitic composition from the Kemashi, Dengi and Didesa Domains, are presented, and a preliminary analysis of the data undertaken. Two suites of metavolcanics are clearly differentiated by the discrimination diagrams. The samples from all three domains are predominantly tholeiitic, subalkaline basalts and andesites. Bivariate plots reveal weak negative correlations of SiO2 and Al2O3 with MgO, and a positive correlation of CaO with MgO, indicating that magmas evolved by fractionation of clinopyroxene, orthopyroxene and olivine from the parent liquids. Trace element spider diagrams show a tight coherence of patterns for the Dengi and Sirkole samples, suggestive that alteration did not accompany metamorphic processes to any great extent, and a slight depletion of HFS elements possibly due to fractionation processes. On the other hand samples from the Kemashi Domain exhibit a wide variation in patterns, with large ranges in concentrations, particularly in the LFS elements, suggestive of significant alteration during metamorphism. Enrichment of Th relative to Nb, and an overall enrichment of LFS elements over HFS elements in the Kemashi samples, are characteristics of ocean floor and back-arc magmas. A Mullen plot shows the Dengi/Sirkole samples plotting predominantly within the calc-alkaline basalt field, whereas the Kemashi samples have a much wider spread, with no interpretation possible. However, a Ti–Zr–Y tectonic discrimination plot shows the Kemashi samples falling into the field of ocean floor basalts, whilst confirming the calc-alkaline basaltic character of the Dengi and Sirkole rocks. Thus the Kemashi Domain volcanics are interpreted to represent oceanic crustal material formed in a spreading environment, whilst the volcanics of the Dengi and Sirkole Domains developed in a convergent setting. Coherence of the Dengi and Sirkole samples suggests that the Sirkole Domain formed by thrusting of the Dengi Volcanic Arc over its foreland leading to imbrication of the Dengi volcanosedimentary sequence with basement gneisses." @default.
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• W2019418903 date "2004-06-01" @default.
• W2019418903 modified "2023-10-14" @default.
• W2019418903 title "Geochemistry of metavolcanics from the Neoproterozoic Tuludimtu orogenic belt, western Ethiopia" @default.
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• W2019418903 doi "https://doi.org/10.1016/j.jafrearsci.2004.07.051" @default.
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