Glacial incursion on a Neoproterozoic carbonate platform in the Kimberley region, Australia

Corkeron, Maree; George, Annette D.

doi:10.1130/0016-7606(2001)113<1121:gioanc>2.0.co;2

Cited by 54 publications

(44 citation statements)

References 38 publications

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“…Although the Walsh Tillite is variously correlated with either the Sturtian or Marinoan glacial level across Australia (see Corkeron 2007 for a summary), that issue is irrelevant for the reliability of the palaeomagnetic pole and its implications for deglaciation of the Walsh ice age. We accept the correlation by Corkeron & George (2001) of the Egan glaciogenic deposit (central Kimberley) with the Boonall dolomite in eastern Kimberley, and by further correlation using stromatolites, the mid-Ediacaran Julie Formation in central Australia. A palaeomagnetic pole from the latter region (Kirschvink 1978) implies a depositional palaeolatitude of 21 + 88 for the Egan, assuming that the pole is primary and the correlations are correct.…”

Section: Australia and Mawsonlandmentioning

confidence: 85%

Chapter 7 Neoproterozoic glacial palaeolatitudes: a global update

Evans

Raub

2011

Memoirs

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New stratigraphic, geochronological and palaeomagnetic constraints allow updates to be made to a synthesis of Neoproterozoic glacial palaeolatitudes, including modifications to some reliability estimates. The overall pattern of a Neoproterozoic climatic paradox persists: there is an abundance of tropical palaeolatitudes and near to complete absence of glaciogenic deposits demonstrably laid down between latitudes of 608 and 908. In addition to 12 units with palaeolatitude estimates that are somewhat reliable, estimates with moderate to high reliability now include Konnarock (less than 108 from the palaeo-equator), Elatina, Rapitan, Mechum River, Grand Conglomerat (10-208), Upper Tindir, Puga (20-308), Nantuo, Gaskiers (30-408) and Walsh (40-508). Among these, Elatina, Upper Tindir and Nantuo are considered to have the highest reliability, all with estimates of low to moderate palaeolatitude. The Elatina result stems from sedimentary rocks with quantitative correction of inclination-shallowing effects, and the Upper Tindir result stems from data collected from igneous rocks that are precisely coeval with the glacial deposits. Despite continuing debate on the global character of Neoproterozoic ice ages, their pan-glacial extent (ice extending to low latitude in a low-obliquity world) is well demonstrated.

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Section: Australia and Mawsonlandmentioning

confidence: 85%

Chapter 7 Neoproterozoic glacial palaeolatitudes: a global update

Evans

Raub

2011

Memoirs

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“…This newly glacial diamictite probably is related to the Gaskiers Glaciation (580 Ma, Knoll et al, 2004) and the glacial incursion identified in the Egan Formation in Australia (Corkeron and George, 2001).…”

Section: Discussionmentioning

confidence: 99%

Glacial diamictites of Serra Azul Formation (Ediacaran, Paraguay belt): Evidence of the Gaskiers glacial event in Brazil

Alvarenga

Figueiredo

Babinski

et al. 2007

Journal of South American Earth Sciences

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“…It lithologically and isotopically resembles the base of many Sturtian cap-carbonate sequences, although the amount of carbonate deposited overall is far smaller. Finally, the Egan diamictite represents a short-lived glacial incursion onto a mid-Ediacaran carbonate platform in the Kimberley region of Western Australia (Corkeron & George 2001). Diamictite and overlying conglomerate are overlain by c.15 m of dolostone with herringbone and trough crossbedding, and an additional c.15 m of interbedded quartz-arenite and silty dolostone with a distinctive stromatolite (Tungussia julia) horizon near the top.…”

Section: Mid-ediacaran Cap Carbonate Sequencesmentioning

confidence: 99%

Chapter 5 Chemical sediments associated with Neoproterozoic glaciation: iron formation, cap carbonate, barite and phosphorite

Hoffman

Macdonald

Halverson

2011

Memoirs

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Orthochemical sediments associated with Neoproterozoic glaciation have prominence beyond their volumetric proportions because of the insights they provide on the nature of glaciation and the records they hold of the environment in which they were precipitated. Synglacial Fe formations are mineralogically simple (haematite jaspilite), and their trace element spectra resemble modern seawater, with a weaker hydrothermal signature than Archaean-Palaeoproterozoic Fe formations. Lithofacies associations implicate subglacial meltwater plumes as the agents of Fe(II) oxidation, and temporal oscillations in the plume flux as the cause of alternating Fe-and Mn-oxide deposits. Most if not all Neoproterozoic examples belong to the older Cryogenian (Sturtian) glaciation. Older and younger Cryogenian (Marinoan) cap carbonates are distinct. Only the younger have well-developed transgressive cap dolostones, which were laid down during the rise in global mean sea level resulting from ice-sheet meltdown. Marinoan cap dolostones have a suite of unusual sedimentary structures, indicating abnormal palaeoenvironmental conditions during their deposition. Assuming the meltdown of ice-sheets was rapid, cap dolostones were deposited from surface waters dominated by buoyant glacial meltwater, within and beneath which microbial activity probably catalysed dolomite nucleation. Former aragonite seafloor cement (crystal fans) found in deeper water limestone above Marinoan cap dolostones indicates carbonate oversaturation at depth, implying extreme concentrations of dissolved inorganic carbon. Barite is associated with a number of Marinoan cap dolostones, either as digitate seafloor cement associated with Fe-dolomite at the top of the cap dolostone, or as early diagenetic void-filling cement associated with tepee or tepee-like breccias. Seafloor barite marks a redoxcline in the water column across which euxinic Ba-rich waters upwelled, causing simultaneous barite titration and Fe(III) reduction. Phosphatic stromatolites, shrub-like structures and coated grains are associated with a glacioisostatically induced exposure surface on a cap dolostone in the NE of the West African craton, but this appears to be a singular occurrence of phosphorite formed during a Neoproterozoic deglaciation.

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Glacial incursion on a Neoproterozoic carbonate platform in the Kimberley region, Australia

Cited by 54 publications

References 38 publications

Chapter 7 Neoproterozoic glacial palaeolatitudes: a global update

Chapter 7 Neoproterozoic glacial palaeolatitudes: a global update

Glacial diamictites of Serra Azul Formation (Ediacaran, Paraguay belt): Evidence of the Gaskiers glacial event in Brazil

Chapter 5 Chemical sediments associated with Neoproterozoic glaciation: iron formation, cap carbonate, barite and phosphorite

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