The palynology of the Lower Permian (Asselian–?Artinskian) Copacabana Formation of Apillapampa, Cochabamba, Bolivia

Pasquo, Mercedes di; Grader, George W.

doi:10.1080/01916122.2012.677644

Cited by 37 publications

(11 citation statements)

References 36 publications

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“…It is also observed similarity with Lunatisporites ovatus, which only differs from L. noviaulensis by its longitudinally oval corpus, and it was considered by Foster (1979) a junior synonym of noviaulensis. The specimen illustrated by di Pasquo and Grader (2012) as L. noviaulensis differs of the species by its haloxylonoid, sub-quadrangular amb, sacci non protrusive with a narrow cappula and more than four taenia on the corpus. A revision perhaps allows to refer it to L. pellucidus.…”

Section: Figurementioning

confidence: 87%

New Record of the Lueckisporites/Weylandites Biozone (Permian) in the Paganzo Basin, Argentina: Stratigraphic Significance

et al. 2022

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We present the first palynological assemblages collected from the fine-grained variegated beds that overlie the De La Cuesta Formation at Puerta de Las Angosturas, Sierra de Narváez, (Catamarca Province), Argentina. Five samples from two different stratigraphic levels provided spores, non-taeniate, taeniate, and sulcate pollen grains referred to the Lueckisporites/Weylandites (LW) Biozone. The palynofloras are equivalent to those previously reported for the Los Jumes area and, therefore, the variegated sequences that overlie the De La Cuesta Formation at both flanks of the Sierra de Narváez are entirely equivalent, not only lithologically but also in fossiliferous content and age. These assemblages are analogous to those recently described in the Valle Hermoso area (La Rioja Province) and isotopically dated at 278.84 ± 0.22 Ma (Kungurian) and can be used as a key stratigraphic horizon to link the initial phases of the Permian volcanism along the southwestern margin of Gondwana and the sedimentation in the retroarc basins. The recognition of diagnostic taxa of the LW Biozone confirms earlier correlations with the Striatites Biozone of the Chacoparaná Basin and the Lv Biozone from Brazil. The different ages recently reported for the succession herein analyzed in Sierra de Narváez and La Veteada Formation suggest that these units should not be correlated. Moreover, while the strata overlying the De La Cuesta Formation records the Permian post-orogenic sedimentation in the Paganzo Basin, the La Veteada Formation accounts for the transition to the rifting conditions that characterized the Triassic basins of northwestern Argentina.

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Section: Figurementioning

confidence: 87%

New Record of the Lueckisporites/Weylandites Biozone (Permian) in the Paganzo Basin, Argentina: Stratigraphic Significance

et al. 2022

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“…was identified from the Copacabana Group of Bolivia [11]. Apparently, the age of this group is late Bashkirian to Kungurian (early Pennsylvanian to Cisuralian) [6,10].…”

Section: Genus Celox Shi Mansky 1967mentioning

confidence: 97%

New Species of Coiled Nautiloids From the Pennsylvanian of the Donets Basin, Ukraine

Dernov¹

2023

paleontology

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Two new species of coiled nautiloids, Gzheloceras poletaevi sp. nov. and Celox oliphanti sp. nov., are described from the Late Bashkirian and Early Moscovian of the Central Donets Basin, Ukraine. Gzheloceras poletaevi sp. nov. differs from Gzheloceras aisenvergi in absence of a longitudinal ridge on the ventolateral shoulder and more compressed whorl profile; Gzheloceras poletaevi differs from Gzheloceras striatum in absence of a spiral lateral ribs and less compressed whorl. Gzheloceras poletaevi is distinguished from Gzheloceras memorandum by more compressed whorl profile and thinly discoidal conch. Gzheloceras poletaevi differs from Gzheloceras pulcher in the absence of a thin transverse lateral ribs and longitudinal ridge on the ventolateral shoulder. Celox oliphanti sp. nov. differs from Celox erratica by delicate growth lines on the conch surface and more rapid whorl’s increase in width and height.

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“…Correlative transitional facies with volcaniclastics occur above the marine Copacabana Formation in central Bolivia. Age dates and palynology suggest they are pre‐Kungurian (Early Permian) and may represent a time–transgressive facies related to the Ene Group of the earliest Mitu basin (di Pasquo & Grader, 2012).…”

Section: The Mitu Group In Perumentioning

confidence: 99%

Sedimentology, geochronology and provenance of the late Permian and Triassic Mitu Group in Peru—The evolution of continental facies along a transform margin

Panca,

Bahlburg,

Cárdenas

et al. 2024

Basin Research

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In the late Permian and Triassic, the continental Mitu Group formed in extensional basins along the length of the Cordillera Oriental and Altiplano of present‐day Peru. Given the presence of coeval arc systems only in northern Chile and southern Ecuador but not in Peru the tectonic setting of the Mitu basin has been interpreted variably as orthogonal continental rift, sinistral transtensional rift, aulacogen and back‐arc basin. The Mitu Group comprises continental mass flow and alluvial fan, fluvial, aeolian and minor lacustrian facies and hosts thick piles of subalkaline and alkaline intermediate and felsic ignimbrites and mafic lavas. The age of the Mitu Group had originally been established as ranging from the Late Permian to the late Triassic on the basis of structural considerations and scarce biostratigraphic data. Recently, U–Pb zircon ages from ignimbrites and sedimentary rocks have been taken to constrain the Mitu Group to the Middle and Late Triassic. We performed a sedimentological, heavy mineral, and zircon geochronological and Lu‐Hf isotope study of the Mitu Group in 14 sections mainly in southern and central Peru, and one section in northern Peru. Ten new U–Pb concordia ages on ignimbrites intercalated in the Mitu Group successions offer a new robust stratigraphic framework and constrain the stratigraphy of the Mitu Group between 260 and 205 Ma. In combination with maximum likelihood ages of deposition derived from detrital zircon, U–Pb geochronology places the deposition of the Mitu Group between ca. 270 and 194 Ma (lower Guadalupian into the Sinemurian). Detrital zircon U–Pb age distributions and heavy mineral assemblages reflect a strongly recycled Precambrian Amazonian and Palaeozoic proto‐Andean provenance. The Palaeozoic detrital age patterns are highly variable, and temporally and spatially random. A local provenance can generally not be identified. εHf(t) values in zircon obtained from ignimbrites and sedimentary rocks indicate variable degrees of crustal recycling. In the course of the Palaeozoic, εHf(t) values become on average progressively less negative, with a large proportion particularly of Mitu age zircons' εHf(t) values encompassing less evolved and moderately juvenile compositions. Along strike of the basin stratigraphic thicknesses, and rates and times of accumulation vary strongly with larger thicknesses and rates being registered in southern Peru. This suggests that the Mitu basin had been divided into a number of subbasins with individual histories of subsidence, accumulation, and volcanism. Absent a magmatic arc, late Permian–Triassic Peru evolved in a sinistral plate tectonic and regional framework expressed particularly in the sinistral Late Gondwanide orogeny predating the Mitu Group. We interpret that a sinistral transform fault linked the subduction zones in southern Ecuador and northern Chile and that the Mitu Group basin has formed by sinistral transtensional and transpressional movements along a related transcurrent fault inboard of the transform margin. In the broader framework of the accretionary Terra Australis orogen along the western Gondwana margin, this interpretation fits its evolution in the Andean segment in an internally consistent way.

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The palynology of the Lower Permian (Asselian–?Artinskian) Copacabana Formation of Apillapampa, Cochabamba, Bolivia

Cited by 37 publications

References 36 publications

New Record of the Lueckisporites/Weylandites Biozone (Permian) in the Paganzo Basin, Argentina: Stratigraphic Significance

New Record of the Lueckisporites/Weylandites Biozone (Permian) in the Paganzo Basin, Argentina: Stratigraphic Significance

New Species of Coiled Nautiloids From the Pennsylvanian of the Donets Basin, Ukraine

Sedimentology, geochronology and provenance of the late Permian and Triassic Mitu Group in Peru—The evolution of continental facies along a transform margin

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