Journal ArticleDOI
Petrographic, Geochemical, and Isotopic Constraints on the Provenance of the Early Proterozoic Chelmsford Formation, Sudbury Basin, Ontario
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The early Proterozoic Chelmsford Formation, a coarse-grained turbidite unit in the Sudbury Basin, was deposited near the margin of the Superior Province craton at about the time of Penokean orogenesis as discussed by the authors.Abstract:
The early Proterozoic Chelmsford Formation, a coarse-grained turbidite unit in the Sudbury Basin, was deposited near the margin of the Superior Province craton at about the time of Penokean orogenesis. Petrography, geochemistry, and Nd and Pb isotopes are consistent with derivation of the Chelmsford Formation from late Archean Superior Province rocks. The framework mineralogy of medium sandstones is dominated by quartz, plagioclase, and minor K-feldspar, consistent with derivation from plutonic rocks. The abundance of matrix (up to 40%), however, allows additional sources. The behavior of Al2O3 relative to Na2O, CaO, and K2O constrains the source to have had, on average, a minor weathering history. Slightly elevated SiO2 and low Z , relative to average plutonic rocks, suggest that there was no more than a minor recycled sedimentary component in the source. High abundances and sympathetic variations in ferromagnesians indicate a mafic component. REE and whole-rock Nd and Pb isotopes constrain the Chelmsford Formation to have been derived from late Archean, LREE,-enriched rocks without significant Eu anomalies, and allow neither a significant component of Penokean mantle-derived material nor early Archean crust. Pb isotopes in feldspar populations require a Superior Province source. Although the age, location, and facies of the Chelmsford Formation are consistent with deposition in response to early Proterozoic active margin processes, the integrated provenance data require the sediment source to have been dominated by relatively fresh Superior Province rocks associated with basement uplift.read more
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Journal ArticleDOI
Geochemistry and provenance of the Middle Ordovician Austin Glen Member (Normanskill Formation) and the Taconian Orogeny in New England
TL;DR: The Austin Glen Member of the upper Middle Ordovician Normanskill Formation is a sandstone-shale succession deposited in the foreland of the Taconian Orogen as mentioned in this paper.
Journal ArticleDOI
Development of the Indus Fan and its significance for the erosional history of the Western Himalaya and Karakoram
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Journal ArticleDOI
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Journal ArticleDOI
Nd and Pb isotope variability in the Indus River System: implications for sediment provenance and crustal heterogeneity in the Western Himalaya
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