ORCID Profile
0000-0001-7374-6928
Current Organisations
US Geological Survey
,
University College Dublin
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Publisher: Society for Sedimentary Geology
Date: 02-2009
Publisher: Society for Sedimentary Geology
Date: 10-2010
Publisher: Elsevier BV
Date: 05-2020
Publisher: US Geological Survey
Date: 2021
DOI: 10.3133/FS20213003
Publisher: Elsevier BV
Date: 09-2020
Publisher: Wiley
Date: 28-01-2019
DOI: 10.1002/DEP2.57
Publisher: Society for Sedimentary Geology
Date: 11-01-2019
DOI: 10.2110/JSR.2019.2
Publisher: Society for Sedimentary Geology
Date: 06-03-2014
DOI: 10.2110/JSR.2014.8
Publisher: Wiley
Date: 14-03-2018
DOI: 10.1111/SED.12572
Publisher: Wiley
Date: 04-2016
DOI: 10.1111/SED.12250
Publisher: Copernicus GmbH
Date: 23-03-2020
DOI: 10.5194/EGUSPHERE-EGU2020-3184
Abstract: & & The Adelaide Rift Complex is a large sedimentary superbasin in South Australia that formed resultant of Rodinia& #8217 s breakup and subsequent evolution of the Australian passive margin of the Pacific basin. It holds a globally significant and exceptionally well-preserved Neoproterozoic& #8211 early Cambrian succession. Much work has been done over the last century describing the lithostratigraphy and sedimentology of this vast basin. The rift complex contains evidence for major changes in Earth& #8217 s systems, yet, the rocks are poorly dated, and the sediment provenance, and link with tectonic evolution, is remarkably poorly known.& & & & This work provides a centralised database of the currently available, and previously unpublished, detrital zircon geochronology for the Neoproterozoic of the Adelaide Rift Complex, highlighting where the available data is from, and the stratigraphic and spatial gaps in our knowledge. By subjecting the U& #8211 Pb detrital zircon data to data analytical techniques, we provide a first look overview of the change in provenance, and subsequently (generalised) palaeo-tectonogeography that this suggests during the Neoproterozoic. These data show a change from dominantly local sources in the middle Tonian, to dominantly far-field sources as the rift-basin develops over time. The Cryogenian icesheets punctuate this with an ephemeral return to more local sources from nearby rift shoulders. This effect is particularly apparent during the Sturtian Glaciation than in the younger Marinoan Glaciation. In the Ediacaran, we see an increasingly stronger influence of younger (& Ma) detrital zircons from an enigmatic source that we interpret to be from southern (i.e. Antarctic) sources. We also note that we see a slight shift in the late Mesoproterozoic age peaks, from ca. 1170 Ma to ca. 1090 Ma, with a corresponding decrease in older ca. 1600 Ma detritus.& & & & This work forms the basis of continuing work to improve our understanding of the geochronology, provenance and palaeo-tectonogeography of the Adelaide Rift Complex.& &
Publisher: Elsevier BV
Date: 10-2018
Publisher: Springer Science and Business Media LLC
Date: 09-03-2021
Publisher: Informa UK Limited
Date: 2005
Publisher: Springer Science and Business Media LLC
Date: 07-02-2020
DOI: 10.1038/S41598-020-58986-5
Abstract: The hyperthermal events of the Cenozoic, including the Paleocene-Eocene Thermal Maximum, provide an opportunity to investigate the potential effects of climate warming on marine ecosystems. Here, we examine the shallow benthic marine communities preserved in the late Cretaceous to Eocene strata on the Gulf Coastal Plain (United States). In stark contrast to the ecological shifts following the end-Cretaceous mass extinction, our data show that the early Cenozoic hyperthermals did not have a long-term impact on the generic ersity nor composition of the Gulf Coastal Plain molluscan communities. We propose that these communities were resilient to climate change because molluscs are better adapted to high temperatures than other taxa, as demonstrated by their physiology and evolutionary history. In terms of resilience, these communities differ from other shallow-water carbonate ecosystems, such as reef communities, which record significant changes during the early Cenozoic hyperthermals. These data highlight the strikingly different responses of community types, i.e., the almost imperceptible response of molluscs versus the marked turnover of foraminifera and reef faunas. The impact on molluscan communities may have been low because detrimental conditions did not devastate the entire Gulf Coastal Plain, allowing molluscs to rapidly recolonise vacated areas once harsh environmental conditions ameliorated.
Publisher: Informa UK Limited
Date: 02-04-2016
Publisher: Elsevier BV
Date: 10-2021
No related grants have been discovered for John Counts.