Provenance of upper Paleozoic siliciclastics rocks from two high-latitude glacially influenced intervals in Bolivia

Published on Jun 1, 2019in Journal of South American Earth Sciences1.704
· DOI :10.1016/J.JSAMES.2019.02.023
Katarzyna Kołtonik3
Estimated H-index: 3
(PAN: Polish Academy of Sciences),
Peter E. Isaacson16
Estimated H-index: 16
(UIdaho: University of Idaho)
+ 7 AuthorsWojciech Krawczyński8
Estimated H-index: 8
(University of Silesia in Katowice)
Abstract The Toregua Formation in northern Bolivia comprises a continuous succession of sedimentary rocks containing two glacial intervals related to the onset of the Late Paleozoic Ice Age (LPIA). The provenance and depositional tectonic setting of the Upper Devonian–Mississippian (lower) and Pennsylvanian (upper) glacial intervals are separated by non-glacial deposits observed in the Manuripi X-1 and Pando X-1 drill cores, from which petrography, geochemistry, detrital zircon U Pb and monazite Th U-total Pb dating are described. Zircon age spectra of sandstone clasts and diamictite indicate an upward change in provenance. Zircon age data from the lower glacial interval yielded age groups at 700–500 Ma, 1300–900 Ma and 2200–1820 Ma, while the monazite gave ages in the range of 600-500 Ma. These age populations correspond to the Guapore Shield and/or the Arequipa Massif. Detrital zircon from the upper glacial interval has a significant age population at 330–300 Ma that reflects prominent input from the Eastern Cordillera. The maximum depositional age of the upper glacial interval was constrained to ca. 308 Ma. Provenance discrimination diagrams, based on major element geochemistry and trace element ratios, suggest that the glacial and non-glacial sediments were mainly sourced from felsic source rocks. The moderate to high chemical index of alteration (CIA
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