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McLaughlin et al., 2019

ViideMcLaughlin, P. I., Emsbo, P., Brett, C. E., Bancroft, A. M., Desrochers, A., Vandenbroucke, T. R., 2019: The rise of pinnacle reefs: A step change in marine evolution triggered by perturbation of the global carbon cycle. Earth and Planetary Science Letters, 515, 13-25. https://doi.org/10.1016/j.epsl.2019.02.039
Autor(id)McLaughlin, P. I., Emsbo, P., Brett, C. E., Bancroft, A. M., Desrochers, A., Vandenbroucke, T. R.
Aasta2019
PealkiriThe rise of pinnacle reefs: A step change in marine evolution triggered by perturbation of the global carbon cycle
Allika tüüpartikkel ajakirjas
AjakiriEarth and Planetary Science Letters, 515
Leheküljed13-25
Abstrakt

The first appearance of pinnacle reef tracts, composed of hundreds to thousands of localized biogenic structures protruding tens to hundreds of meters above the surrounding mid-Silurian seafloor, represents a step change in the evolution of the marine biosphere. This change in seafloor morphology opened a host of new ecological niches that served as “evolutionary cradles” for organism diversification. However, the exact timing and drivers of this event remain poorly understood. These uncertainties remain, in large part, due to a paucity of index fossils in the reef facies, the difficulty of correlating between the offshore pinnacle reefs and more temporally well-constrained shallow marine facies, and cryptic unconformities that separate amalgamated reefs. Here we use δ13Ccarb stratigraphy within a sequence stratigraphic framework to unravel these complex relationships and constrain the origination of Silurian pinnacle reef tracts in the North American midcontinent to near the Pt. celloni Superzone—Pt. am. amorphognathoides Zonal Group boundary of the mid-Telychian Stage. In addition, we identify a striking relationship between pulses of reef development and changes in global δ13Ccarb values and sea level. Viewed through this new perspective, we correlate prolific periods of reef development with short-lived carbon isotope (δ13Ccarb) excursions and eustatic sea level change that, ultimately, reflect perturbations to the global carbon cycle. From changes in the dominance of microbial reefs of the Cambrian to metazoan colonization of reefs in the Middle Ordovician, through the subsequent collapse of metazoan diversity with the Late Ordovician mass extinction, and the first appearance of early Silurian (Llandovery) pinnacle reef tracts and their proliferation during the late Silurian (Wenlock-Pridoli) and Devonian, major reef formation intervals increasingly coincide with δ13Ccarb excursions. These patterns suggest that Paleozoic reef evolution was the product of environmental forcing by perturbations of the global carbon cycle.

Keelinglise
Märksõnad
DOIhttps://doi.org/10.1016/j.epsl.2019.02.039
LisainfoReused data from the Viki core for comparison
Kirje ID9690
Sisestatud, muudetud2019-03-26T16:21:22Z | 2020-04-20T06:57:57Z

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