caa a22 4500 467933944 CHVBK 20180406152951.0 cr unu---uuuuu 170328e20060301xx s 000 0 eng 10.1007/s10347-005-0022-4 doi (NATIONALLICENCE)springer-10.1007/s10347-005-0022-4 Growth models of Bajocian coral-microbialite reefs of Chargey-lès-Port (eastern France): palaeoenvironmental interpretations [Elektronische Daten] [Nicolas Olivier, Bernard Lathuilière, Philippe Thiry-Bastien] Very large amount of microbialites, up to 70% of the reef volume takes part in the edification of Lower Bajocian coral reefs in the Chargey-lès-Port quarry (Haute-Saône, France). Such high amounts of microbialites were unknown within bioconstructions of Middle Jurassic age. Along the 16m-thick section, seven successive biohermal or biostromal units developed on a shallow platform. Bioconstructions display a first coral growth phase with either constratal or superstratal growth fabrics. Coral fauna is relatively poorly diversified and is dominated by massive forms (Isastrea, Thamnasteria, and Periseris) or branched phaceloid (Cladophyllia) and ramose (Dendraraea) colonies. Corals can be heavily encrusted by microbialites of diverse forms and fabrics (leiolitic, thrombolitic, and stromatolitic). According to the coral growth fabrics, microbialite crusts developed on top of or at the underside of coral colonies, forming a coral-microbialite elementary unit. Microbialites show a multiphase development: (i) directly at the coral surface, a first and mm-scale microbialite layer locally developed; (ii) a second, cm-scale microbialite layer (up to 8cm thick) covered the entire coral reef framework and assumed the main building role; and (iii) a third, mm- to cm-scale, laminated microbialite layer may also be observed onlapping previous reef structures, before having been progressively buried under sediments. Contemporaneously to the coral growth phase, the first microbialite layer developed on dead portions of coral colonies. The transition between coral growth and microbialite development (i.e., second layer of microbialites) is interpreted as a result of a coral reef crisis, probably reflecting more nutrient-rich conditions. The passage to a stromatolitic (third) layer suggests a control of the accumulation rate. Composition and architecture of coral-microbialite reef units of Chargey-lès-Port highlight the relations between high-frequency fluctuating environmental factors (mainly accumulation rate and trophic conditions) and reef development. Springer-Verlag, 2005 Reef nationallicence Microbialite nationallicence Coral nationallicence Growth fabric nationallicence Trophic condition nationallicence Accumulation rate nationallicence Bajocian nationallicence Northeastern France nationallicence Olivier Nicolas Université Claude Bernard Lyon 1, UMR CNRS 5125 PEPS, 2 rue Raphaël Dubois, 69622, Villeurbanne, France aut Lathuilière Bernard Université Henri Poincaré, UMR CNRS 7566 G2R, BP 239, 54506, Vandoeuvre, cedex, France aut Thiry-Bastien Philippe Université Claude Bernard Lyon 1, UMR CNRS 5125 PEPS, 2 rue Raphaël Dubois, 69622, Villeurbanne, France aut Facies Springer-Verlag 52/1(2006-03-01), 113-127 0172-9179 52:1<113 2006 52 10347 https://doi.org/10.1007/s10347-005-0022-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10347-005-0022-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Olivier Nicolas Université Claude Bernard Lyon 1, UMR CNRS 5125 PEPS, 2 rue Raphaël Dubois, 69622, Villeurbanne, France aut NATIONALLICENCE 700 1- Lathuilière Bernard Université Henri Poincaré, UMR CNRS 7566 G2R, BP 239, 54506, Vandoeuvre, cedex, France aut NATIONALLICENCE 700 1- Thiry-Bastien Philippe Université Claude Bernard Lyon 1, UMR CNRS 5125 PEPS, 2 rue Raphaël Dubois, 69622, Villeurbanne, France aut NATIONALLICENCE 773 0- Facies Springer-Verlag 52/1(2006-03-01), 113-127 0172-9179 52:1<113 2006 52 10347 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer