New constraints on the last aragonite-calcite sea transition from early Jurassic ooids

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Vulpius S, Kießling W
Zeitschrift: Facies
Verlag: SPRINGER
Jahr der Veröffentlichung: 2018
Band: 64
Heftnummer: 1
ISSN: 0172-9179


Abstract

Calcite and aragonite seas are commonly distinguished based on the prevailing primary mineralogy of ooids and carbonate cements over time. Secular oscillations of these seas are usually attributed to changes in ocean chemistry and paleoclimate. While the veracity of such oscillations has been verified by independent data and modeling approaches, the timing of the transition from one ocean state to the other remains poorly resolved. Here, the timing of the last aragonite-calcite sea transition is estimated by assessing the preservation of Early Jurassic ooids from the Trento Platform in northern Italy. Point counting of ooid-bearing limestones from four distinct stratigraphic levels provides a contrasting pattern: Hettangian and Sinemurian ooids are all poorly preserved and were probably predominantly originally aragonitic, whereas Pliensbachian and Toarcian ooids are excellently preserved, suggesting a primary calcitic mineralogy. Although calcitic ooids may have already been common in the Late Triassic, it is proposed that the last aragonite-calcite sea transition occurred in the Early Jurassic between the Sinemurian and Pliensbachian, at least in this subtropical region. Therefore, the selective extinction of aragonite-secreting organisms at the end-Triassic mass extinction cannot be attributed to secular changes in ocean chemistry.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Kießling, Wolfgang Prof. Dr.
Lehrstuhl für Paläoumwelt
Vulpius, Sara
Lehrstuhl für Endogene Geodynamik


Zitierweisen

APA:
Vulpius, S., & Kießling, W. (2018). New constraints on the last aragonite-calcite sea transition from early Jurassic ooids. Facies, 64(1). https://dx.doi.org/10.1007/s10347-017-0516-x

MLA:
Vulpius, Sara, and Wolfgang Kießling. "New constraints on the last aragonite-calcite sea transition from early Jurassic ooids." Facies 64.1 (2018).

BibTeX: 

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