Provenance of upper Paleozoic siliciclastics rocks from two high-latitude glacially influenced intervals in Bolivia
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F19%3A00504093" target="_blank" >RIV/67985831:_____/19:00504093 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0895981118303389?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0895981118303389?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jsames.2019.02.023" target="_blank" >10.1016/j.jsames.2019.02.023</a>
Alternative languages
Result language
angličtina
Original language name
Provenance of upper Paleozoic siliciclastics rocks from two high-latitude glacially influenced intervals in Bolivia
Original language description
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 Guaporé 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 <81) and mineralogical index of alteration (MIA = 81–90 values), abundance of siderite clasts and dominance of kaolinite and abraded zircon grains (without correlation between age and zircon roundness) indicate that the lower glacier incorporated material from older sedimentary covers. In the upper glacial interval, the lower CIA (70) and MIA (71) values and the abundance of plagioclase and detrital zircon grains with preserved euhedral shape <400 Ma suggest that local volcanic rocks in addition to sedimentary covers were eroded.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of South American Earth Sciences
ISSN
0895-9811
e-ISSN
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Volume of the periodical
92
Issue of the periodical within the volume
June 2019
Country of publishing house
GB - UNITED KINGDOM
Number of pages
10
Pages from-to
12-31
UT code for WoS article
000469893100004
EID of the result in the Scopus database
2-s2.0-85062730886