Duration and nature of the end-Cryogenian (Marinoan) glaciation

Prave, Anthony R.; Condon, Daniel; Hoffmann, Karl Heinz; Tapster, Simon; Fallick, Anthony E.

doi:10.1130/g38089.1

Cited by 148 publications

(79 citation statements)

References 28 publications

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“…However, even considering an age around 600 Ma for the Sete Lagoas Formation basal facies, we still have a pronounced gap to the end of the Marinoan glaciation, well established in 635 Ma (Prave et al 2016), being necessary to assume a few tens of millions years hiatus, not yet detected, for this correlation.…”

mentioning

confidence: 67%

Facies analysis, sequence stratigraphy and chemostratigraphy of the Sete Lagoas Formation (Bambui Group), northern Minas Gerais State, Brazil: evidence of a cap carbonate deposited on the Januária basement high

Júnior

Uhlein

et al. 2017

Braz. J. Geol.

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Sedimentary rocks of the Sete Lagoas Formation, exposed in the left margin of the São Francisco river (Minas Gerais State, Brazil), were deposited on the Januária-Itacarambi basement high. They show both lateral and vertical rock stacking along continuous outcrops, allowing us to carry out detailed facies analysis and sequence stratigraphy studies. Our studies also integrate data from geological mapping, macro and microscopic petrography and high-resolution C and O isotope analysis. Eight facies and four facies associations make up a sequence composed by a transgressive tract in the base, and a high stand tract in the upper portion, separated by a maximum flooding surface. The high stand tract shows a progradation stacking from the basement high apex towards progressively deeper basement areas. This stratigraphic framework, associated with others stratigraphic and isotopic features, indicates that the now exposed Januária basement high also represents a paleo-high during the sedimentation event. Aragonite pseudomorphs and dolomites coupled with δ 13 C values of -5‰ characterize the basal carbonate of the transgressive tract as a cap carbonate. Records of the Cloudina fossil, recognized in the high stand tract, indicate a Late Ediacaran age for the upper portion of the studied stratigraphic sequence. KEYWORDS

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mentioning

confidence: 67%

Facies analysis, sequence stratigraphy and chemostratigraphy of the Sete Lagoas Formation (Bambui Group), northern Minas Gerais State, Brazil: evidence of a cap carbonate deposited on the Januária basement high

Júnior

Uhlein

et al. 2017

Braz. J. Geol.

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“…tapped a Paleoarchean provenance that is largely absent from Timeball Hill. The Neoproterozoic Ghaub diamictite, which was deposited between 0.64 and 0.65 Ga (Prave et al, 2016), yields a Nd T DM model age of 1.8 Ga. No zircon data are available for this sample; however, the Paleoproterozoic T DM model age suggests crustal components that are significantly older than the depositional age. The Ghaub diamictite is characterized by a μ 182 W value of −5.9 ± 4.5, which is unresolved from the 2SE of the laboratory standard.…”

Section: Measurementsmentioning

confidence: 89%

“…Epsilon Nd values were calculated relative to a chondritic model mantle with the isotope compositions defined by Bouvier et al (2008). εNd (T) are epsilon Nd values calculated at the maximum depositional age, which are from 1 Kositcin and Krapež (2004), 2 Mukasa et al (2013), 3 Rasmussen et al (2013), 4 Prave et al (2016), 5 Isbell et al (2008). Dwyka West sample may be reflected in the HSE and compatible transition element concentrations of this composite, these source components, potentially characterized by a negative μ 182 W values, may have been significantly diluted by younger, felsic materials with normal W isotopic compositions and much higher W concentrations.…”

Section: Measurementsmentioning

confidence: 99%

Tungsten-182 in the upper continental crust: Evidence from glacial diamictites

Mundl

Walker

Reimink³

et al. 2018

Chemical Geology

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Study of igneous and sedimentary rocks that may be representative of the chemical and isotopic characteristics of portions of the upper continental crust (UCC) has provided important insights to the origin and growth of the continents, as well as the large-scale chemical evolution of the silicate Earth. For example, changes in the major and trace element compositions, as well as long-lived radiogenic isotope systematics of (meta)sedimentary rocks through time have led to the conclusion that at least some portions of the Archean UCC were enriched in maficultramafic components compared to UCC with younger provenance (

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“…However, there is still no definitive proof supporting a worldwide extent for Huronian glaciations (Young, 2014). Also, global glacial episodes are relatively short (few hundred thousand to a few million years; Prave et al, 2016) so a set of Precambrian chert samples, which are often poorly dated, defining the d 18 O chert for a given 50 Ma time interval, may not have formed contemporaneously with a known glacial period. Finally, it is important to note that reconstructed T have remained below ca.…”

Section: Implications For Surface Temperatures On the Earth During Thmentioning

confidence: 99%

Warm Archaean oceans reconstructed from oxygen isotope composition of early-life remnants

Tartèse¹,

Chaussidon²,

Gurenko³

et al. 2016

Geochem. Persp. Let.

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doi: 10.7185/geochemlet.1706 Deciphering the surface conditions on the Earth during Archean times (> 2.5 billion years ago -Ga) is crucial to constrain the conditions that promoted the development of life. The progressive shift through time of the oxygen isotopic compositions of Precambrian siliceous sediments -the so-called cherts -has been interpreted as indicating a secular decrease of seawater temperature by 50-80 °C from the early Archean to the present-day. However, this interpretation has been questioned, notably because it assumes that the seawater oxygen isotopic composition has remained globally constant since 3.5 Ga, though this has never been tested by direct isotopic measurements on Archean samples. Here we report measurements of the oxygen isotopic composition of carbonaceous matter indigenous to Precambrian cherts up to ca. 3.5 Ga. These new results demonstrate that the oxygen isotope composition of seawater during most of the Precambrian remained around 0 ± 5 ‰, which is consistent with the composition of present day seawater. Combined with the chert oxygen isotope composition record, this indicates that ca. 3.5 Ga ago ocean bottom-water temperatures were ~50-60 °C higher than today.

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Duration and nature of the end-Cryogenian (Marinoan) glaciation

Abstract: 10The end-Cryogenian glaciation (Marinoan) was Earth's last global glaciation yet its duration 11 and character remain uncertain. Here we report U-Pb zircon ages for two discrete ash beds within 12 glacimarine deposits from widely separated localities of the Marinoan-equivalent Ghaub

Cited by 148 publications

References 28 publications

Facies analysis, sequence stratigraphy and chemostratigraphy of the Sete Lagoas Formation (Bambui Group), northern Minas Gerais State, Brazil: evidence of a cap carbonate deposited on the Januária basement high

Facies analysis, sequence stratigraphy and chemostratigraphy of the Sete Lagoas Formation (Bambui Group), northern Minas Gerais State, Brazil: evidence of a cap carbonate deposited on the Januária basement high

Tungsten-182 in the upper continental crust: Evidence from glacial diamictites

Warm Archaean oceans reconstructed from oxygen isotope composition of early-life remnants

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