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Upper Triassic - Lower Jurassic reef and carbonate build-up development as recorders of biotic, environmental and climatic changes (REEFCADE - project completion)

English title Upper Triassic - Lower Jurassic reef and carbonate build-up development as recorders of biotic, environmental and climatic changes (REEFCADE - project completion)
Applicant Martini Rossana
Number 178908
Funding scheme Project funding (Div. I-III)
Research institution Section des Sciences de la Terre et de l'environnement Université de Genève
Institution of higher education University of Geneva - GE
Main discipline Palaeontology
Start/End 01.04.2018 - 31.03.2022
Approved amount 585'156.00
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All Disciplines (2)

Discipline
Palaeontology
Geology

Keywords (12)

Sedimentology; Panthalassa; Upper Triassic; Lower Jurassic; Palaeoecology; Micropaleontology; Palaeobiogeography; Corals; Tethys; Shallow water reefal carbonates; Biostratigraphy; Foraminifers

Lay Summary (French)

Lead
Depuis plus d’un demi-siècle de recherches approfondies, les études sédimentologique et stratigraphique du Trias de l’est de la Pangée, et en particulier de la Téthys, représentent une contribution majeure à l'effort général pour évaluer le mode et l'ampleur de la « révolution » biologique et écologique globale qui a affecté notre planète à la limite Trias-Jurassique (TJB), il y a environ 200 millions d’années. Il s’agit de l’une des crises les plus importantes de l’histoire de la Terre, au cours de laquelle des changements biotiques et environnementaux profonds se sont produits. Cependant, des études comparatives entre des localités éloignées dans le domaine Téthysien ont rarement été conduites, et des comparaisons entre Téthys et Panthalassa, à haute résolution stratigraphique, ont été rarement conduites.
Lay summary

Contenu et objectifs du travail de recherche

L’objectif principal de ce projet à long terme, qui a débuté en 2007, est de comparer les calcaires récifaux des océans Téthys et Panthalassa au Trias supérieur-Jurassique inférieur, en utilisant une approche multidisciplinaire (sédimentologie, micropaléontologie et géochimie). A cet effet, des pays, où ces calcaires affleurent extensivement, ont été retenus: (1) le Japon (Ile d’Hokkaido), l’extrême Est de la Russie (Primorsky and Khabarovsk krais) et la Cordillère Nord Amercaine (Ile de Vancouver et Yukon) pour le Trias des terrains de la Panthalassa ; (2) l’Europe et le Maroc pour les successions du Jurassique inférieur de la Téthys Alpine.

 

Contexte scientifique et social du projet de recherche

Le programme de recherche a pour but :

  • Analyser la composition et la paléoécologie des microfossiles (foraminifères) et des organismes bâtisseurs de récifs (coraux).
  • Evaluer les conditions écologiques du passé.
  • Proposer des modèles sédimentologiques pour les divers contextes dépositionnels.
  • Comprendre si l'apparition/disparition des organismes après la limite T-J peut être liée à des variations des écosystèmes ou à la durée de la dispersion des organismes à travers l'immense océan Panthalassa.
  • Effectuer des révisions taxonomique et systématique des foraminifères et des coraux.
Direct link to Lay Summary Last update: 01.04.2018

Responsible applicant and co-applicants

Employees

Associated projects

Number Title Start Funding scheme
156422 Upper Triassic - Lower Jurassic reef and carbonate build-up development as recorders of biotic, environmental and climatic changes (REEFCADE - continuation) 01.12.2014 Project funding (Div. I-III)

Abstract

Sedimentological and biostratigraphic investigations in the Triassic and Jurassic of Eastern Pangaea, especially of the Tethys, provide a major contribution to the general effort to evaluate the mode and magnitude of the global biological and ecological “revolution” that occurred at the Triassic-Jurassic (T-J) boundary, a critical juncture in Earth’s history, during which profound biotic and environmental changes occurred. However, these investigations have failed to identify global evolution trends because previous studies dealt with individual localities and single fossil groups. Comparative studies between distant localities within the Tethys realm have rarely been conducted, and comparisons between Tethyan and Panthalassan provinces at high stratigraphic resolution are almost absent.This proposal is part of a long-term research effort that started in 2007 and is supported by the SNSF. It aims to compare Tethyan and Panthalassan Upper Triassic-Lower Jurassic shallow water reefal limestone using sedimentology, micropaleontology and geochemistry points of view. In this context, and based on the very promising results already obtained during the past projects (# 200020_124402 / 200020_137661 / 200021_130238), three sites have been carefully chosen: (1) mid-oceanic atoll-type carbonates from the Sambosan Accretionary Complex (SAC) (Japan); (2) mid-oceanic shallow water carbonates from western North America terranes (i.e., Antimonio and Vizcaino in Mexico), with regard to Upper Triassic (Carnian-Rhaetian); and (3) Alpine Tethyan shallow water reefal carbonates of the Lower Jurassic (Hettangian-Sinemurian).The research program seeks to accomplish the following:•Study the reefs and reefal facies because, considering their high sensitivity to ecological factors, they will supply new insights into the depositional environments allowing assessment of past ecological conditions.•Analyse the composition and palaeoecology of microfossils and reef-building organisms, in particular foraminifer and coral associations.•Propose sedimentological models for mid-oceanic atoll-type build-up upon a seamount in a subduction-generated accretionary terrane as well as for volcanic island-arc carbonate platforms and reefs.•Compare and correlate Tethyan and Panthalassan foraminifer and coral associations, and use them to understand if the occurrence and disappearance of the taxa after the T-J boundary can be linked to the ecosystem variations (e.g., nature of the seaway connections between the polar waters and the westernmost Tethys) or to the time needed for organism dispersal (e.g., across the huge Panthalassa Ocean).•In addition, this type of research has been and will always provide unique opportunities for taxonomic and systematic revisions, specifically in the systematics of foraminifers and corals.Establishing a correlation between Japanese and Western North American localities with the better-studied counterparts in the Alpine Tethyan domain would be highly significant for the discrimination of the biological (e.g., lineages, endemism of fauna) and environmental factors (e.g., role of oceanic circulation, possible influence of seawater composition) leading to the Triassic/Jurassic evolutionary turnover.
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