The depth of pelagic deposits in the Tethyan Jurassic and the use of corals: an example from the Apennines

Gill, Gabriel A.; Santantonio, Massimo; Lathuilière, Bernard

doi:10.1016/j.sedgeo.2004.01.013

Cited by 65 publications

(42 citation statements)

References 31 publications

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“…Menzies et al 1973;Gage & Tyler 1991). This level is in line with a conservative interpretation of the average continental shelf break depth at 130 m (Davis 1977), and approximates the base of the photic zone in clear waters at low latitudes (Gill et al 2004). Assemblages classified as "shallow" are subdivided as follows:…”

Section: Palaeo-depth Classification Of Assemblagessupporting

confidence: 70%

Temporary expansion to shelf depths rather than an onshore-offshore trend: the shallow-water rise and demise of the modern deep-sea brittle star family Ophiacanthidae (Echinodermata: Ophiuroidea)

Thuy

2013

EJT

465

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Hypotheses on the age and possible antiquity of the modern deep-sea fauna put forward to date almost all agree on the assumption that the deep-sea fauna is largely the result of colonisation from shallow-water environments. Here, the fossil record of the Ophiacanthidae, a modern deep-sea brittle star family with extensive fossil occurrences at shelf depths, is systematically traced against a calibrated phylogeny. Several lines of evidence suggest that the Ophiacanthidae originated and greatly diversified in the deep sea, with most extant clades having diverged by the end of the Triassic at the latest. During the Jurassic, the family temporarily invaded shelf environments, attaining relative abundances and diversities comparable to those found in coeval and modern deep-sea settings, and gradually declined in abundance subsequently, to become largely restricted to the deep-sea again. The pattern of temporary expansion to shelf environments suggested here underpins the potential of deep-sea environments to contribute significantly to shallow-water biodiversity; an aspect that has mostly been neglected so far. It is speculated that the large-scale ophiacanthid invasion of shelf environments around the Triassic-Jurassic boundary was initiated by a change from thermohaline to halothermal circulation, attenuating the thermal stratification of the water column and thus providing opportunities for enhanced vertical migration of marine taxa

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Section: Palaeo-depth Classification Of Assemblagessupporting

confidence: 70%

Temporary expansion to shelf depths rather than an onshore-offshore trend: the shallow-water rise and demise of the modern deep-sea brittle star family Ophiacanthidae (Echinodermata: Ophiuroidea)

Thuy

2013

EJT

465

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“…The habitat of the corals was poorly lit. The new interpretation of microsolenid structure and function suggests a dominant suspension feeding habit, which is coherent with a lower infralittoral mesotrophic situation (Lathuilire and Gill 1995;Morycowa and Roniewicz 1995;Leinfelder et al 1996;Insalaco 1996;Gill et al 2004). Epibenthos now strongly dominates endobenthos.…”

Section: Palaeoenvironmentmentioning

confidence: 69%

Coral zonation of an Oxfordian reef tract in the northern French Jura

Lathuilière

Gaillard

Habrant

et al. 2005

Facies

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International audienceDuring the Middle Oxfordian, numerous coral reefs flourished on the northern margin of the Tethys Ocean. The outcrop of Bonnevaux-le-Prieuré (northern French Jura mountains) provides a rare opportunity to observe a nearly complete section allowing the installation, evolution and demise of this global carbonate reef rich event to be studied. Quantitative data on coral assemblages together with sedimentological and palaeoecological observations lead to the reconstruction of a reef tract coral zonation. Starting from the outer slope, Dimorpharaea, Microsolena, Dendraraea, Comoseris, and Stylina ecozones are recognized. This new facies model implies a central position for an oolitic shoal in the highest energy zone, within the Comoseris ecozone. Applying this facies model to the sequence stratigraphic interpretation of the vertical succession results in recognising a third-order relative sea-level fluctuation, which can be correlated at least with Lorraine (France) and Switzerland

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“…No reefs were developed on Italian PCPs during the Jurassic. The Friuli carbonate platform (Insalaco et al, 1997) and the Umbria-Marche Apennines PCPs (Santantonio et al, 1997;Gill et al, 2004) are characterized by a significant microbial component and by pennular mesotrophic corals lacking a reef growth framework.…”

Section: Paleoclimatic Interpretationmentioning

confidence: 99%

Paleoclimatic control of biogeographic and sedimentary events in Tethyan and peri-Tethyan areas during the Oxfordian (Late Jurassic)

Cecca¹,

Martin-Garin²,

Marchand³

et al. 2005

Palaeogeography, Palaeoclimatology, Palaeoecology

117

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The paleobiogeographical distribution of Oxfordian ammonites and coral reefs in northern and Central Europe, the Mediterranean area, North and East Africa, and the Middle East and Central Asia is compared with the distribution in time and space of the most important lithofacies. Interest in the Oxfordian is focused on changes in facies and in biogeographical patterns that can be interpreted as the results of climatic events. Paleotemperature trends inferred from oxygen isotopes and paleoclimatic simulations are tested against fossil and facies data. A Late Callovian-Early Oxfordian crisis in carbonate production is indicated by the widespread absence of Lower Oxfordian reefal formations. There is a gap (hiatus) in deposition on epicontinental platforms, with Middle Oxfordian deposits resting paraconformably on Upper Callovian, while shales accumulated in adjacent intracratonic basins. Simultaneously, in Mediterranean Tethys, radiolarites accumulated in deep troughs while Rosso Ammonitico facies formed on pelagic swells. However, deposition on swells was also discontinuous with numerous gaps (hiatuses) and sequences that are much reduced in thickness. Middle Callovian deposits are generally overlain by Middle Oxfordian limestones. The dearth of carbonates is consistent with a cooling event lasting about 1 My. By the middle Oxfordian a warming, leading to bgreenhouseQ type conditions, is suggested on the basis of both biogeographical (mostly coralreef distribution) and geochemical data. Carbonates spread onto an extensive European platform while radiolarites reached a maximum development in the Mediterranean Tethys. Two distinct latitudinal belts, with seemingly different accumulation regimes, are therefore inferred. Similar latitudinal belts were also present in the late Oxfordian, when carbonates were widespread. The distribution of reefal facies in the late Oxfordian-early Kimmeridgian fits relatively well with GCMs simulations that imply low rainfall in the Tethyan Mediterranean area and slightly higher precipitation in central and northern Europe. Local salinity variations, reflecting more arid or humid conditions, may bias the paleotemperature signal inferred from

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The depth of pelagic deposits in the Tethyan Jurassic and the use of corals: an example from the Apennines

Cited by 65 publications

References 31 publications

Temporary expansion to shelf depths rather than an onshore-offshore trend: the shallow-water rise and demise of the modern deep-sea brittle star family Ophiacanthidae (Echinodermata: Ophiuroidea)

Temporary expansion to shelf depths rather than an onshore-offshore trend: the shallow-water rise and demise of the modern deep-sea brittle star family Ophiacanthidae (Echinodermata: Ophiuroidea)

Coral zonation of an Oxfordian reef tract in the northern French Jura

Paleoclimatic control of biogeographic and sedimentary events in Tethyan and peri-Tethyan areas during the Oxfordian (Late Jurassic)

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