Diagenesis of Upper Triassic Wetterstein Reefs of the Bavarian Alps

Henrich, Rüdiger; Zankl, Heinrich

doi:10.1007/978-3-642-82812-6_13

Cited by 25 publications

(24 citation statements)

References 14 publications

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“…These lines of evidence suggest that the limestone at least in Subunits A-2 and A-3 had become emergent and was subjected to subaerial exposure during an early diagenetic phase. The dolomite rhombs in Subunit A-3 probably formed under a burial condition in a mixing zone of hypersaline and meteoric waters (Henrich 1984;Henrich and Zankl 1986). The dark color of subunit A-3 rocks is due to impregnation by organic matter and/or iron sulfides as well as the black pebbles.…”

Section: Discussionmentioning

confidence: 98%

Sequence boundary and related sedimentary and diagenetic facies formed on Middle Permian mid-oceanic carbonate platform: Core observation of Akiyoshi Limestone, Southwest Japan

Nakazawa

Ueno

2004

Facies

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Detailed core observation of the Akiyoshi Limestone, Southwest Japan, reveals a sequence boundary and related sedimentary and diagenetic facies formed on a late Murgabian (Middle Permian) mid-oceanic carbonate platform. The sequence boundary lies upon karstified bioclastic grainstone and is overlain by peritidal lime-and dolo-mudstone. The karstified bioclastic grainstone, which had been affected by subaerial exposure and early diagenetic processes, is characterized by crystal silts, prismatic, bladed and dogtooth cements, blackened limestone features, and alveolar textures. The overlying peritidal limeand dolo-mudstone is 8 m thick and exhibits fenestrae, fissures, laminations, black pebbles, and low-diversity biota composed exclusively of ostracodes and calcispherids. The sequence boundary almost coincides with a major fusulinoidean biostratigraphic boundary. A sea-level fall in the late Murgabian resulted in a biotic turnover and formed the sequence boundary and the karst textures. The following relatively slow transgression resulted in the deposition of the thick transgressive peritidal unit.

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Section: Discussionmentioning

confidence: 98%

Sequence boundary and related sedimentary and diagenetic facies formed on Middle Permian mid-oceanic carbonate platform: Core observation of Akiyoshi Limestone, Southwest Japan

Nakazawa

Ueno

2004

Facies

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“…"Tubiphytes" multisiphonatus thrombolites (Erzlahn) or bryozoans (Cresta De Do Peniola)-are observed at one locality only Turriglomina mesotriasica. Ladinian reefs of the Northern Calcareous Alps are more diverse with respect to sponges and algae but show a similar abundance of encrusting "Tubiphytes" group (Rüffer and Zamparelli 1997;Henrich and Zankl 1986). The main difference between Wetterstein Fm-reefs of the Northern Calcareous Alps and the Latemar is the organisation of the margin and its geometries.…”

Section: Biostratigraphical Position Of the Reefmentioning

confidence: 96%

“…Wetterstein Fm reefs typically prograde rapidly, show talus breccias with abundant early marine cementation and are characterised by a ramp-like topography (e.g. Henrich and Zankl 1986), all of these features cannot be observed at Latemar.…”

Section: Biostratigraphical Position Of the Reefmentioning

confidence: 99%

The reefal margin and slope of a Middle Triassic carbonate platform: the Latemar (Dolomites, Italy)

Emmerich

Zamparelli

Bechstädt

et al. 2005

Facies

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The Latemar is a mainly aggrading platform, but shows repeated backstepping during its entire development. The behaviour of the slope does not reflect accommodation changes and lateral consistencies of the lagoonal interior; the Latemar contemporaneously reveals different, even contrasting depositional characteristics. The slope of the late stage platform evolution corresponds at least partially to the "base-of-slope apron" model. Controlling factors on slope evolution are of tectonic (proximity of the Stava Line) and autocyclic (repeated oversteepening) nature. Other factors are insignificant and/or overprinted. The reef-facies at Latemar reveals a complex facies pattern; it varies along and across the margin and is rich in encrusting sponges, corals, biogenic crusts and "Microproblematica". Some biota or fossil assemblages-e.g. foraminifers (Abriolina mediterranea, Turriglomina scandonei) or "Tubiphytes" multisiphonatus thrombolites-have not been described in the Dolomites before. Biostratigraphic evidence from the uppermost reef-facies confirms a mainly Anisian age of the outcropping platform interior.

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“…Recently, impressive diagenetic sequences have been revealed in carbonates from various stratigraphic positions; e.g., in Pleistocene beachrocks (Schroeder, 1979), in Paleocene corals (Schroeder, , 1988, in Cretaceous basinmargin carbonates (Enos, 1988), in sponge and algal reefs of the Jurassic (Koch and Schorr, 1986), in algal reefs of the alpine Triassic (Henrich and Zankl, 1986), and in Paleozoic basin and reef carbonates (Clark, 1980;Cercone and Lohmann, 1986). All of these rocks are characterized by a complex diagenesis with multiple alternations of the diagenetic environment.…”

Section: Effectiveness Of Diagenetic Environmentsmentioning

confidence: 99%

Marine and meteoric diagenesis of submarine pleistocene carbonates from the Bermuda Carbonate Platform

Vollbrecht

1990

Carbonates Evaporites

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The tectonically stable Bermuda Carbonate Platform has undergone repeated emersions and submersions in the course of the Pleistocene sea-level changes. Shallow seismic reflection profiling and high-energy vibration coring gave access to Pleistocene carbonates that are presently situated below sea level. A study of their diagenesis was undertaken in order to document the changes occuring in various diagenetic environments, to check a, possible correlation between the state of diagenetic preservation and stratigraphic age, and to estimate the odds for a complete diagenetic imaging of a sediment's pore-water history. For the purpose of comparison, several samples from the modern Bermuda Islands were analysed as well.As indicated by their biogenic constituents, the submarine Pleistocene carbonates were chiefly composed of aragonite and high-Mg-calcite at the onset of diagenesis, whereas they now commonly appear as mixtures of aragonite and low-Mg-calcite. Marine cements (five kinds of high-Mgcalcite cement, three kinds of aragonite cement) are, as a rule, restricted to the intraparticle pore space. Meteoric influence inflicted neomorphism, cementation with low-Mg-calcite (several kinds of cement) and solution on the marine carbonates. These are characterized by patchy lithification, abundant preserved pore space and incomplete mineralogical stabilization. Furthermore, especially in lagoonal sediments, burrow or root structures have been preferentially cemented. Indicators of karst and calichification are common. High-Mg-calcite is usually the first mineral to disappear under meteoric influence; aragonite is more stable. Intensely altered carbonates consist entirely of low-Mg-calcite, whereas dolomite does not occur at all.Diagenetic indications of meteoric-phreatic alteration are generally uncommon, but support the idea of fresh-water lenses that are largely restricted to the proximity of the present islands. Most of the carbonates, however, have received their decisive diagenetic imprints in the meteoricvadose environment.The diagenetic record within the carbonates is incomplete. Only one pore-water change is recorded, from a marine to a meteoric environment. Undoubted post-meteoric marine cements are absent from the studied Pleistocene material except for some intensely Iithified littoral deposits on the present islands. Obviously, the diagenetic potential of the marine environment was too small to compete with the meteoric environment. Under these circumstances, a reconstruction of pore-water history based on diagenetic sequences is deceptive.

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Diagenesis of Upper Triassic Wetterstein Reefs of the Bavarian Alps

Cited by 25 publications

References 14 publications

Sequence boundary and related sedimentary and diagenetic facies formed on Middle Permian mid-oceanic carbonate platform: Core observation of Akiyoshi Limestone, Southwest Japan

Sequence boundary and related sedimentary and diagenetic facies formed on Middle Permian mid-oceanic carbonate platform: Core observation of Akiyoshi Limestone, Southwest Japan

The reefal margin and slope of a Middle Triassic carbonate platform: the Latemar (Dolomites, Italy)

Marine and meteoric diagenesis of submarine pleistocene carbonates from the Bermuda Carbonate Platform

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