Speculations on the genesis of crinoidal limestones in the Tethyan Jurassic

Jenkyns, Hugh C.

doi:10.1007/bf02000466

Cited by 28 publications

(14 citation statements)

References 21 publications

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“…Crinoidal limestones have been known for a long time to mark the drowning of shallow carbonate platforms and the transition to pelagic sedimentation on top of submarine plateaux (e.g. Jenkyns 1971) and more recently the role of palaeoceanographic factors, mainly affecting trophic resources and thus the composition of faunal assemblages, has been evidenced (e.g. Cobianchi and Picotti 2001).…”

Section: Calcari DI Val Tanarellomentioning

confidence: 99%

Middle-Late Jurassic syndepositional tectonics recorded in the Ligurian Briançonnais succession (Marguareis–Mongioie area, Ligurian Alps, NW Italy)

et al. 2011

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The Middle-Upper Jurassic succession of the Marguareis-Mongioie area (Ligurian Briançonnais Domain), developed in a protected shelf environment evolving into a pelagic plateau, bears clear evidence of synsedimentary tectonics such as: growth fault-related structures; neptunian dykes; marked lateral variations in stratigraphic thicknesses testifying to the juxtaposition of sectors characterized by different sedimentation and subsidence rates; discordant, anomalous stratigraphic contacts corresponding to paleoescarpments; nodular beds showing evidence of fluidification interpreted as seismites; and the occurrence of sand-sized quartz grains pointing to denudation of Permo-Triassic quartz-rich rocks. Such evidence documents an important Middle-Late Jurassic post-breakup tectonic activity, which was more effective in controlling the basin topography than the Early Jurassic syn-rift tectonic phase. Two main tectonosedimentary stages, one occurring during the Bathonian, the other falling within the Callovian-Kimmeridgian interval, were reconstructed. The first stage can be referred to a faultrelated activity occurring shortly after the initial stages of oceanic spreading of the Ligurian Tethys; the second can be genetically related to the far effects of the first rifting stage of the Bay of Biscay and the Valais basin.

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Section: Calcari DI Val Tanarellomentioning

confidence: 99%

Middle-Late Jurassic syndepositional tectonics recorded in the Ligurian Briançonnais succession (Marguareis–Mongioie area, Ligurian Alps, NW Italy)

et al. 2011

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“…Such a feature is relatively rare in crinoidal limestones, because the primary sediment is made up of ossicles of variable size (Jenkyns 1971). The good sorting points to multiple reworking of the crinoidal sands which was accompanied by the systematic removal of finer ossicles through winnowing (cf.…”

Section: Discussionmentioning

confidence: 99%

“…They were formed in an early phase of drowning just above shallow water carbonates and below pelagic Rosso Ammonitico type limestones (Bernoulli and Jenkyns 1974). In such a position they occur in Sicily (Jenkyns 1971;Di Stefano et al 2002), the Dolomites (Massetti and Bottoni 1978) the Choč unit (Uchman 1994) and the High-Tatric unit in the Tatra Mts. (Lefeld et al 1985;Łuczyński 2002).…”

Section: Comparison With Other Jurassic Crinoidal Limestonesmentioning

confidence: 97%

“…Massetti and Bottoni 1978;Aubrecht and Skora 1998; to basinal environments (Roux et al 1988). It has been suggested that Sicilian crinoidal limestones accumulated as "sand-waves" on top of seamounts swept by bottom currents, with periodical influence of wave action (Jenkyns 1971). Other authors, in contrast, interpret them as tidal dunes and sandwaves of deep outer-shelf (Neumeier 1998), storm (e.g.…”

Section: Introductionmentioning

confidence: 97%

“…They usually occupy a well-defined position in such stratigraphic successions between shallowwater deposits and pelagic carbonates or radiolarites. Such successions are known, for example, from the Western Sicily (Jenkyns 1971;Di Stefano et al 2002), the Dolomites (Massetti and Bottoni 1978) and the Velˇka Fatra in Slovakia (MiÐík and Rakffls 1964), from the Choč unit (Uchman 1994) and from the High-Tatric unit in the Tatra Mts. (Lefeld et al 1985;Łuczyński 2002).…”

Section: Introductionmentioning

confidence: 98%

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Storm-dominated deposition of the Lower Jurassic crinoidal limestones in the Kr�?na unit, Western Tatra Mountains, Poland

Jach

2004

Facies

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The Lower-Middle Jurassic of the Krína unit in the Western Tatra Mts. (southern Poland) shows considerable facies variation. Crinoidal grainstones of variable thickness (up to 12 m) are one of characteristic facies. They occur above spiculites which were deposited below storm wave base on the slopes of elevated horsts. First single beds of crinoidal limestones occur within spiculites. They were deposited as event beds, generated probably by storms. The overlying thick complex of wellsorted grainstones composed almost entirely of crinoidal ossicles display widespread erosional bed amalgamation, hummocks and locally wave-formed ripples. The above characteristics are the effects of multiple reworking and winnowing of fine crinoidal material by oscillatory currents related to storms. This proves that the sedimentation of the crinoidal grainstones took place between the storm and the fair-weather wave bases. The vertical transition from spiculites with intercalations of crinoidal limestone beds towards the crinoidal grainstones is interpreted as the result of a shallowing upward trend. Since this trend is opposite to the global Early Toarcian transgression, this could be related to an uplift due to local block tectonic activity. The evidence for that is diversification of facies in the Krína Basin, as well as submarine slumps recorded in spiculites. The location of Krína Basin on relatively low northern latitude and on western edges of great Tethys Ocean during Early Jurassic enabled the formation of the crinoidal tempestites.

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Sicilian Lithostratigraphic Units

Basilone

2018

Lithostratigraphy of Sicily

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Speculations on the genesis of crinoidal limestones in the Tethyan Jurassic

Cited by 28 publications

References 21 publications

Middle-Late Jurassic syndepositional tectonics recorded in the Ligurian Briançonnais succession (Marguareis–Mongioie area, Ligurian Alps, NW Italy)

Middle-Late Jurassic syndepositional tectonics recorded in the Ligurian Briançonnais succession (Marguareis–Mongioie area, Ligurian Alps, NW Italy)

Storm-dominated deposition of the Lower Jurassic crinoidal limestones in the Kr�?na unit, Western Tatra Mountains, Poland

Sicilian Lithostratigraphic Units

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