Accelerating Neoproterozoic research through scientific drilling

Condon, Daniel J.; Boggiani, Paulo César; Fike, David A.; Halverson, Galen P.; Kasemann, Simone A.; Knoll, Andrew H.; Macdonald, Francis A.; Prave, Anthony R.; Zhu, Maoyan

doi:10.5194/sd-19-17-2015

Cited by 5 publications

(2 citation statements)

References 38 publications

(36 reference statements)

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“…We concur with suggestions (e.g. [44]) that the field would benefit from four-dimensional (space-and-time) databases bringing together available evidence. Such frameworks have significant potential to permit precise correlation of biological and environmental/geological events, thus enabling testing of causal relationships between them.…”

Section: Moving Forwardsupporting

confidence: 87%

The origin and rise of complex life: progress requires interdisciplinary integration and hypothesis testing

et al. 2020

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Understanding of the triggers and timing of the rise of complex life ca 2100 to 720 million years ago has expanded dramatically in recent years. This theme issue brings together diverse and novel geochemical and palaeontological data presented as part of the Royal Society ‘ The origin and rise of complex life: integrating models , geochemical and palaeontological data ’ discussion meeting held in September 2019. The individual papers offer prescient insights from multiple disciplines. Here we summarize their contribution towards the goal of the meeting; to create testable hypotheses for the differing roles of changing climate, oceanic redox, nutrient availability, and ecosystem feedbacks across this profound, but enigmatic, transitional period.

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Section: Moving Forwardsupporting

confidence: 87%

The origin and rise of complex life: progress requires interdisciplinary integration and hypothesis testing

et al. 2020

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“…A significant development was a workshop on continental drilling of the Neoproterozoic, convened by Dan Condon and Tony Prave and held at the British Geological Survey headquarters at Keyworth in 2014. The scientific output (Condon et al ., ) is a broad research agenda divided approximately into the three geological systems of the Neoproterozoic, but recognizing the importance of considering the lead‐up to the initial glaciation: hence the ‘Cryogenian aims’ include events back to ca 730 Ma. This dovetails with efforts of the Cryogenian subcommission of the International Commission on Stratigraphy to refine criteria for a boundary and identify a stratotype for the start of the Cryogenian Period and System.…”

Section: Conclusion: the Future Research Agendamentioning

confidence: 99%

Sedimentological perspectives on climatic, atmospheric and environmental change in the Neoproterozoic Era

2016

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Sedimentological insights underpin many of the important recent advances in understanding of Earth system behaviour in the Neoproterozoic Era. This article reviews three main areas: (i) chemical proxies and their preservation, with emphasis on carbonate facies; (ii) glacial and post-glacial facies, including their age constraints; (iii) sedimentary evidence for biotic innovations and responses. Chemostratigraphy plays an important role in ordering Neoproterozoic events and defining disturbances to the carbon cycle. There is increasing attention being paid to assessing the role of diagenetic origination or modification of chemostratigraphic signals. Alongside this, new criteria for identifying primary dolomite and precursor metastable phases such as ikaite have been developed. In respect of oxygenation, geochemical proxies substantiate the concept of a Neoproterozoic Oxygenation Event as a very gradual transition, the ocean being at any one time a heterogeneous assemblage of ferruginous, sulphidic and oxic conditions, with some evidence of increasing deep-sea oxidation through the Ediacaran Period. Techniques such as Fe-speciation need to be supplemented with proxies sensitive to suboxic conditions. More generally, it is predicted that petrographically constrained microanalytical studies will also become more important in reconstructing palaeoenvironmental conditions. The global distribution of Neoproterozoic glacial deposits combined with palaeomagnetic evidence supports the concept of panglaciations in which ice sheets reached sea-level in the tropics. Advances in radiometric dating have demonstrated the synchronous onset of global (Sturtian) glaciation at 717 Ma and the demise of a second (Marinoan) glaciation at 635 Ma, and plausibly indicate long durations for each (55 Myr for Sturtian and 5 to 15 Myr for Marinoan). However, a compilation of radiometric dates indicates ambiguities indicating the need for further improvements to the radiometric and Sr-isotope database to understand events within the Sturtian time frame, the timing of onset of Marinoan glaciations, and the age and synchroneity of individual negative d 13 C anomalies. Sturtian deposits are typically thick, rift-related successions containing a range of environments influenced or dominated by dynamic glaciers, as well as ice-free marine intervals. Marinoan glacial deposits, by contrast, tend to be thin and continental. During the latter interval, oxygen isotope systematics of sulphate demonstrate that atmospheric CO 2 was high, as predicted by Snowball Earth theory, and that sedimentation was influenced by orbital forcing. The Sturtian record, by comparison, needs to be searched for evidence of cold-climate hiatuses on the one hand and orbital forcing on the other. Cap carbonate formation appears to have coincided with rising sea-levels following panglaciations. Snowball theory considers that they formed rapidly in the postglacial greenhouse, but an alternative (2016) 63, 253-306 doi: 10.1111/sed.12261 STATE OF THE SCIENCE model o...

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The Inventory of the Geological and Paleontological Sites in the Area of the Aspirant Geopark Bodoquena-Pantanal in Brazil

et al. 2020

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Accelerating Neoproterozoic research through scientific drilling

Cited by 5 publications

References 38 publications

The origin and rise of complex life: progress requires interdisciplinary integration and hypothesis testing

The origin and rise of complex life: progress requires interdisciplinary integration and hypothesis testing

Sedimentological perspectives on climatic, atmospheric and environmental change in the Neoproterozoic Era

The Inventory of the Geological and Paleontological Sites in the Area of the Aspirant Geopark Bodoquena-Pantanal in Brazil

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