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Showing 1 to 7 of 7 for “"Palaeoproterozoic"”.
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STRUCTURAL EVOLUTION IN THE PALAEOPROTEROZOIC BASEMENT (BANDED IRON FORMATION AND RELATED ROCKS) OF SW EGYPT
Structural evolution in the Palaeoproterozoic Banded Iron Formation of SW Egypt The exposed basement of the Western Desert of Egypt is part of the pre-Pan-African East Sahara Craton. The Gabel Uweinat-Bir Safsaf Aswan Uplift is situated at the eastern fringe of this craton, and its high-grade …
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The tectonic evolution of the Southern Granulite Terrane of India and its role in the amalgamation of Gondwana.
… Block mainly yielded late Archaean to early Palaeoproterozoic (ca. 2.7 - 2.45 Ga) detrital zircon ages with εHf values between +0.3 and +8.8, suggesting derivation from largely juvenile sources. ln contrast, the metasedimentary rocks from the Madurai Block are dominated by Mesoarchean to …
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Origin of the Kleva Ni-Cu sulphide mineralisation in Småland, southeast Sweden
… is dominated by 1.81–1.77 Ga granites of the Palaeoproterozoic Transscandinavian Igneous Belt (TIB). Slightly older (1.83–1.82 Ga) rocks of the Oskarshamn Jönköping Belt, which hosts numerous syngenetic and epigenetic base metal mineralisations, occur just south of the Kleva intrusive complex. …
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Tektonometamorphe Entwicklung von Scherzonen im präkambrischen Basement Südindiens
… (LIL-, Nd-rich granitoids) and Neoarchaean-Palaeoproterozoic Nd-model ages (TDM 2.3-3.0 Ga), the PSZ-gneisses show affinity to the adjacent Madurai Block. Sheared orthogneisses from the KSZ show Mesoarchaean average crustal residence ages (TDM 3.2-3.3 Ga) typical for Dharwar Craton gneisses. …
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Pre-rift evolution of Malawian high-grade basement rocks
… intersection of three major orogenic belts: The Palaeoproterozoic Ubendian Belt, Mesoproterozoic Kibaran/Irumide Belt, and Pan African Mozambique Belt. Its complexity makes it difficult to unravel, especially in terms of identifying features of older orogenic events which have already experienced …
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Metamorphic evolution of ultrahigh-temperature granulite facies and upper amphibolite facies rocks of the Epupa Complex, NW Namibia
… (1) The Orue Unit consists of a Palaeoproterozoic volcano-sedimentary sequence, which was intruded by large masses of I-type granitoids and by rare mafic dykes. During the Mesoproterozoic (1390-1318 Ma) the Orue Unit rocks underwent upper amphibolite facies metamorphism. The …
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The geology and geochemistry of the Omai goldfield, Guyana
… saprolitealluvial placer deposits, hosted within Palaeoproterozoic granite-greenstone terrain of the Guiana Shield. Total mining reserves are estimated at 44.8 million tonnes, grading at 1.43 glt Au. The goldfield lies along an ESE-trending, regional-scale structure referred to as the …