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Provenance of Late Carboniferous to Jurassic sandstones for southern Taimyr, Arctic Russia: A comparison of heavy mineral analysis by optical and QEMSCAN methods
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2015 (English)In: Sedimentary Geology, ISSN 0037-0738, E-ISSN 1879-0968, Vol. 329, 166-176 p.Article in journal (Refereed) Published
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Abstract [en]

Sandstone framework-grain petrography, optical and QEMSCAN (Quantitative Evaluation of Minerals by Scanning Electron Microscopy) heavy mineral analysis carried out on 40 samples collected from east and west southern Taimyr are used to constrain the provenance and tectonic history of Late Carboniferous to Late Jurassic siliciclastic sequences. The tectonic settings of provenance evolved gradually from a mix of volcanic arc and recycled orogen to craton interior. Much of the detritus in the Late Paleozoic to Mesozoic siliciclastic succession came from proximal sources with contributions from multi-type source rocks including acid igneous rocks, basalts, sedimentary rocks and low to medium-grade metamorphic rocks. Carboniferous to Permian sandstones contain low-diversity suites of heavy minerals, including apatite, tourmaline, zircon, rutile, Cr-spinel, monazite and titanite. Cr-spinel indicates probable influx from exposed ophiolitic basement. Abundant euhedral zircon and apatite suggest a volcanic arc source related with Uralian collision. The appearance of garnet in the early Triassic signals the unroofing of a metamorphic source. The abrupt increase of clinopyroxene in Middle to Late Triassic sandstones indicates the influx of detritus from basic rocks related with Siberian Trap magmatism. The decrease of Cr-spinel and an abundance of staurolite in Jurassic samples indicate that unroofing of an ophiolitic source ceased and that stripping of a different thrust sheet containing plenty of staurolite-bearing metamorphic rocks commenced. (C) 2015 Elsevier B.V. All rights reserved.

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2015. Vol. 329, 166-176 p.
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SWEDARCTIC 2012, Tajmyr 2012
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URN: urn:nbn:se:polar:diva-2871DOI: 10.1016/j.sedgeo.2015.09.008ISI: 000364883200012OAI: oai:DiVA.org:polar-2871DiVA: diva2:929766
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Swedish Polar Research Secretariat
Available from: 2016-05-19 Created: 2016-05-19 Last updated: 2016-05-19

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