Pre-Pampean metasedimentary rocks from the Argentinian Puna: Evidence for the Ediacaran margin of Gondwana or the Arequipa–Antofalla–Western Pampeanas block

Naidoo, Thanusha; Zimmermann, Udo; Vervoort, Jeffrey D.

doi:10.1016/j.precamres.2016.05.009

Cited by 8 publications

(4 citation statements)

References 40 publications

(87 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The widespread distribution of sandstones associated with glacial diamictites all over the world could be the result of such global interaction. A review of the Riphean-Ediacaran boundary shows a significant development of diamictites associated with monomineralic quartzose sandstones, which may also have been of aeolian origin in Neoproterozoic sedimentary successions following worldwide glacial events in South America [68,69], in Africa [54], in Australia [53,55,70], in North America [71], and in the East Siberian craton, in our case, where such deposits were traced over a distance of more than 800 km from well A-5 to well S-1, indicating a huge magnitude of aeolian processes (Figure 1).…”

Section: Climate Conditionsmentioning

confidence: 99%

Ancient Aeolian Reservoirs of the East Siberia Craton

Shaldybin,

Kvachko,

Rudmin

et al. 2023

Geosciences

View full text Add to dashboard Cite

Fine-grained strata deposited on the Eastern Siberian craton are predominantly considered to mainly consist of Neoproterozoic sandstones. Clastic rocks near the unconformity border of the Ediacaran and the Riphean are represented by sandstone and siltstone layers with thicknesses of several tens of meters, belonging to the Nepa, Tira, and Byuk horizons in the Nepa–Botuoba region. These Neoproterozoic sandstones have features characteristic of aeolianites formed under the action of high wind velocity in the Ediacaran period. Sandstone samples near the Riphean–Ediacaran boundary were collected from five deep wells and characterized for granulometry and mineral composition using optical microscopy, XRD, SEM, and ICP-MS techniques. These sandstones have a high proportion of quartz (60–98%) with minor amounts of feldspars, carbonate, and sulfate cements. Thin sections of the sandy rocks feature bimodal distributions of the grains throughout many sections, with large well-rounded quartz grains being several orders of magnitude greater than the silt matrix grains. The monomineralic quartz rocks have an overgrowth of quartz grains. These rocks can be petroleum reservoirs with good porosity and permeability, but in most of the studied intervals, a high content of anhydrite and dolomite interstitial cement significantly reduces both. The porosity of the rocks is low, while the permeability is very low, which may be associated with a significant amount of clay and cement material. Aeolianites normally contain large amounts of bimodal quartz (due to its high stability and resistance to weathering) and possess the presence of heavy minerals.

show abstract

Section: Climate Conditionsmentioning

confidence: 99%

Ancient Aeolian Reservoirs of the East Siberia Craton

Shaldybin,

Kvachko,

Rudmin

et al. 2023

Geosciences

View full text Add to dashboard Cite

show abstract

“…There is no direct evidence of the Pampean magmatic arc in either Bolivia or southern Peru. However, on the basis of detrital zircon age data, Chew et al (2008), with support from Naidoo et al (2016), argued for a mainly Ediacaran magmatic arc active between 650 and 550 Ma (Fig. 2), which is now buried beneath the eastern part of the central Andes and/or the western Amazon Basin.…”

Section: ■ the Neoproterozoic Rock Record Of The Central Andesmentioning

confidence: 99%

“…It also lacks Famatinian ages ranging between 520 and 450-420 Ma (e.g., Bahlburg et al, 2009;Einhorn et al, 2015). Both Famatinian age groups are typical of Gondwana and very common in a large variety of late Neoproterozoic and Paleozoic sedimentary formations in the central Andes (e.g., Chew et al, 2007bChew et al, , 2008Bahlburg et al, 2009;Cardona et al, 2009;Augustsson et al, 2015;Einhorn et al, 2015;Naidoo et al, 2016;Pepper et al, 2016), but are notably absent from the Chilla beds (Fig. 14A).…”

Section: Maximum Depositional Age and Stratigraphic Agementioning

confidence: 99%

“…The visual inspection of detrital zircon age spectra is a commonly applied method to compare different and sometimes large and variable data sets, even Puncoviscana Formation, NW Argentina upper Neoproterozoic -lower Cambrian Adams et al (2011) Ordovician formations, northern Bolivia Reimann et al (2010) Indications of a Neoproterozoic arc, central Andes Chew et al (2008) Ediacaran quartzites, southern Puna, NW Argentina Naidoo et al (2016) Devonian formations, southern Peru Reimann et al (2010) Ordovician formations, southern Peru though this method is prone to introducing a subjective bias. Applying visual inspection as an exercise, we can say that the Chilla beds detrital zircon age spectrum is rather similar to the 2000-750 Ma segments of respective distributions of the central Andean units (Figs.…”

Section: Derivation Of the Zircon Grainsmentioning

confidence: 99%

See 1 more Smart Citation

The missing link of Rodinia breakup in western South America: A petrographical, geochemical, and zircon Pb-Hf isotope study of the volcanosedimentary Chilla beds (Altiplano, Bolivia)

et al. 2020

View full text Add to dashboard Cite

The assembly of Rodinia involved the collision of eastern Laurentia with southwestern Amazonia at ca. 1 Ga. The tectonostratigraphic record of the central Andes records a gap of ∼300 m.y. between 1000 Ma and 700 Ma, i.e., from the beginning of the Neoproterozoic Era to the youngest part of the Cryogenian Period. This gap encompasses the time of final assembly and breakup of the Rodinia supercontinent in this region. We present new petrographic and whole-rock geochemical data and U-Pb ages combined with Hf isotope data of detrital zircons from the volcanosedimentary Chilla beds exposed on the Altiplano southwest of La Paz, Bolivia. The presence of basalt to andesite lavas and tuffs of continental tholeiitic affinity provides evidence of a rift setting for the volcanics and, by implication, the associated sedimentary rocks. U-Pb ages of detrital zircons (n = 124) from immature, quartz-intermediate sandstones have a limited range between 1737 and 925 Ma. A youngest age cluster (n = 3) defines the maximum depositional age of 925 ± 12 Ma. This is considered to coincide with the age of deposition because Cryogenian and younger ages so typical of Phanerozoic units of this region are absent from the data. The zircon age distribution shows maxima between 1300 and 1200 Ma (37% of all ages), the time of the Rondônia–San Ignacio and early Sunsás (Grenville) orogenies in southwestern Amazonia. A provenance mixing model considering the Chilla beds, Paleozoic Andean units, and data from eastern Laurentia Grenville sources shows that >90% of the clastic input was likely derived from Amazonia. This is also borne out by multidimensional scaling (MDS) analysis of the data. We also applied MDS analysis to combinations of U-Pb age and Hf isotope data, namely εHf(t) and 176Hf/177Hf values, and demonstrate again a very close affinity of the Chilla beds detritus to Amazonian sources. We conclude that the Chilla beds represent the first and hitherto only evidence of Rodinia breakup in Tonian time in Andean South America.

show abstract

The Provenance of Selected Neoproterozoic to Lower Paleozoic Basin Successions of Southwest Gondwana: A Review and Proposal for Further Research

Zimmermann

2018

Regional Geology Reviews

View full text Add to dashboard Cite

Pre-Pampean metasedimentary rocks from the Argentinian Puna: Evidence for the Ediacaran margin of Gondwana or the Arequipa–Antofalla–Western Pampeanas block

Cited by 8 publications

References 40 publications

Ancient Aeolian Reservoirs of the East Siberia Craton

Ancient Aeolian Reservoirs of the East Siberia Craton

The missing link of Rodinia breakup in western South America: A petrographical, geochemical, and zircon Pb-Hf isotope study of the volcanosedimentary Chilla beds (Altiplano, Bolivia)

The Provenance of Selected Neoproterozoic to Lower Paleozoic Basin Successions of Southwest Gondwana: A Review and Proposal for Further Research

Contact Info

Product

Resources

About