Response of a carbonate platform to the Cenomanian-Turonian Drowning and OAE 2: a case study from the Adriatic Platform (Dalmatia, Croatia)

Korbar, Tvrtko; Glumac, Bosiljka; Tešović, Blanka Cvetko; Cadieux, S. B.

doi:10.2110/jsr.2012/17

Cited by 29 publications

(27 citation statements)

References 27 publications

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“…Interestingly, in Mexico two intervals of thick laminated microbialites (Figures 3 and 6 in Elrick et al, 2009;Bomou et al, 2010) have been reported from shelf carbonates at stratigraphic positions similar to the dark laminite clusters on the ACP. In Croatia a thick microbialite bed is also described in the lower part of the OAE-2 interval (Korbar et al, 2012), correlatable with our laminite I cluster. These observations also point to the widespread occurrence of microbial proliferation in shallow carbonate platforms during OAE-2.…”

Section: N-fixing Cyanobacteria and Oae-2supporting

confidence: 84%

“…Most known carbonate platforms experienced a severe biocalcification crisis coeval with OAE-2, with shallow water deposits abruptly overlain by facies containing calcispheres and planktic foraminifera, which is an evidence of the demise and eventual drowing of the platform system (e.g., Caus et al, 1997;Jenkyns, 1991;Korbar et al, 2012). Only a few localities preserve a record of nearly continuous carbonate platform growth across OAE-2 (e.g., Apennine Carbonate Platform [ACP]; Parente et al, 2007Parente et al, , 2008Mexico Platform, Elrick et al, 2009), and their study is of key importance to obtain a continuous signal of the response of these settings and communities to the palaeoenvironmental perturbations accompanying the onset and the evolution of the OAE-2.…”

Section: Introductionmentioning

confidence: 99%

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Cyanobacteria Proliferation in the Cenomanian‐Turonian Boundary Interval of the Apennine Carbonate Platform: Immediate Response to the Environmental Perturbations Associated With OAE‐2?

Frijia

Forkner²,

Minisini

et al. 2019

Geochem Geophys Geosyst

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Oceanic Anoxic Event‐2 (OAE‐2; Cenomanian‐Turonian) is characterized by extensive deposition of organic carbon‐rich deposits (black shales) in ocean basins worldwide as result of a major perturbation of the global carbon cycle. While the sedimentological, geochemical, and paleontological aspects of deep water expressions of OAE‐2 have been intensively studied in the last few decades, much less attention has been given to the coeval shallow water deposits. In this study, we present the results of a detailed facies and petrographic (optical microscope and scanning electron microscopy) and geochemical studies (δ13Ccarb, δ 13C org, δ 15Nbulk, TOC, and Rock‐Eval pyrolysis) on two key shallow marine sections from the Apennine Carbonate Platform (ACP; Italy). Here a continuous record of shallow water carbonates through the OAE‐2 interval is preserved, offering the unique opportunity to document the archive of paleoenvironmental changes in a neritic setting, at a tropical latitude and far from the influence of a large continental block. Two conspicuous intervals are characterized by abundant and closely spaced “dark” microbial laminites found at correlative stratigraphic horizons in the two stratigraphic sections. These laminites contain elevated concentrations of TOC (up to 1%) relative to microbial capping cycles laminites stratigraphically above and below. The organic matter preserved in these fine‐grained laminites is dominated by cyanobacteria remains, which accounted for most of the organic matter produced on the ACP in these intervals. Our study suggests that Tethyan carbonate platforms experienced significant biological changes during OAE‐2, alternating, in few kiloyears, between eutrophic phases dominated by microbial communities and mesotrophic/oligotrophic conditions favoring “normal” carbonate production/sedimentation. The synchronous occurrence of microbialite facies at different locations across the ACP and on other platforms worldwide (e.g., Mexico and Croatia) suggests a causal link between Large Igneous Province volcanism and the environmental conditions necessary to trigger cyanobacterial proliferation on shallow carbonate platforms.

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Section: N-fixing Cyanobacteria and Oae-2supporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Cyanobacteria Proliferation in the Cenomanian‐Turonian Boundary Interval of the Apennine Carbonate Platform: Immediate Response to the Environmental Perturbations Associated With OAE‐2?

Frijia

Forkner²,

Minisini

et al. 2019

Geochem Geophys Geosyst

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“…The complex calcitic spherules from interval 4 (Figures d and c) do not resemble the simple Late Cretaceous marine pithonellid calcispheres found in interval 3, which are common in open carbonate platform facies of the ACP (e.g., Korbar, Glumac, Cvetko Tešovic, & Cadieux, ). Interestingly, the spherules more closely resemble Palaeozoic calcispheres (cf.…”

Section: Discussionmentioning

confidence: 92%

Post‐impact event bed (tsunamite) at the Cretaceous–Palaeogene boundary deposited on a distal carbonate platform interior

Korbar

McDonald

Fuček³

et al. 2017

Terra Nova

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We show crucial evidence for the Cretaceous-Palaeogene (K-Pg) boundary event recorded within a rare succession deposited in an inner-platform lagoon on top of a Mesozoic, tropical, intra-oceanic (western Tethys) Adriatic carbonate platform, which is exposed at Likva cove on the island of Bra c (Croatia). The last terminal Maastrichtian fossils appear within a distinct 10-12 cm thick event bed that is characterised by soft-sediment bioturbation and rare shocked-quartz grains, and is interpreted as a distal tsunamite. Directly overlying this is a 2 cm thick reddishbrown clayey mudstone containing planktonic foraminifera typical of the basal Danian, and with elevated platinum-group elements in chondritic proportions indicating a clear link to the Chicxulub asteroid impact. These results strongly support the first discovery of a "potential" K-Pg boundary tsunamite on the neighbouring island of Hvar, and these two complementary sections represent probably the most complete record of the event among known distal shallow-marine successions.

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“…Bottom-water anoxia has rarely been implicated as a contributor to drowning in combination with tectonic subsidence. Case studies that have interpreted such a combination causing drowning have interpreted global oceanic anoxic events as the source of anoxia (e.g., Fö llmi and Gainan 2008; Kobar et al 2012). Local basin anoxia would be an equally plausible mechanism; however, we have found no examples in the literature of local anoxia being proposed in combination with tectonic subsidence as a cause for platform drowning.…”

Section: Introductionmentioning

confidence: 69%

Drowning of the Triassic Yangtze Platform, South China, By Tectonic Subsidence Into Toxic Deep Waters of An Anoxic Basin

Minzoni¹,

Lehrmann²,

Dezoeten³

et al. 2015

Journal of Sedimentary Research

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The Yangtze Platform drowned and was buried by pelagic facies and siliciclastic turbidites in western Guizhou Province during the Late Triassic, Carnian. The uppermost platform facies of the Ladinian Yangliujing Fm. consists of peritidal cyclic carbonate. Ladinian margin facies of the Longtou Fm. consist of grainstone and lenses of coral-Tubiphytes algal boundstone indicating high-energy shoals and patch reefs. The drowning horizon is laterally variable; it is either a sharp surface or a gradational shift to dark, nodular-bedded lime mudstone and wackestone of the Zhuganpo Fm. The contact lacks phosphatized or glauconitized hardgrounds that would indicate drowning by excess nutrient flux. Uppermost platform carbonates have a tropical photozoan biota and lack siliciclastic content indicating neither climate cooling nor siliciclastic flux played a role in drowning. The Zhuganpo Fm. contains a dominantly pelagic biota of ammonoids, planktonic bivalves, pseudoplanktonic crinoids, conodonts, and the marine reptile Keichousaurus. Rare bioturbation and benthic biota in the lower part indicate dysoxic conditions with an upward shift to anoxic conditions. The overlying Wayao Fm. is a pyritic, laminated, black argillaceous lime mudstone that grades to black shale with an exclusively pelagic fauna and marine reptile lagerstättes indicating anoxic deep-marine sedimentation.Syndepositional faults played a significant role in the evolution of the western sector of the Yangtze Platform and controlled three local, backstepped accommodation cycles in the Zhenfeng area. Faults that developed during the last accommodation cycle tip out at the drowning horizon and include a flower structure upon which a pinnacle reef developed while the rest of the platform drowned. Lateral variability in the drowning horizon and thickness of the post-drowning pelagic facies suggest that differential tectonic subsidence caused the platform to sink into deep water along faults.Magnetic susceptibility and paleomagnetic-reversal correlations demonstrate that the western sector of the platform drowned while shallow-marine, mixed carbonate siliciclastic sedimentation continued in the eastern sector which later terminated in shallow water by increasing siliciclastic flux. Starved black shale horizons in the basin indicate recurrent bottom-water anoxia. Elevated trace-metal concentrations in the pelagic facies of the Zhuganpo and Wayao formations indicate dysoxic to anoxic conditions and enhanced preservation of organic matter. Tectonic subsidence likely submerged the western sector into deep, toxic waters of the basin, killing benthic carbonate production.Previous studies have implicated the Carnian pluvial event as a cause of drowning of the Yangtze Platform and the shift to siliciclastic turbidites of the Laishike Fm., but the Yangtze Platform drowned earlier than western Tethys platforms and siliciclastics were already rapidly infilling the basin in the Anisian and Ladinian, indicating that the events are probably unrelated. Siliciclastics of the Laish...

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Response of a carbonate platform to the Cenomanian-Turonian Drowning and OAE 2: a case study from the Adriatic Platform (Dalmatia, Croatia)

Cited by 29 publications

References 27 publications

Cyanobacteria Proliferation in the Cenomanian‐Turonian Boundary Interval of the Apennine Carbonate Platform: Immediate Response to the Environmental Perturbations Associated With OAE‐2?

Cyanobacteria Proliferation in the Cenomanian‐Turonian Boundary Interval of the Apennine Carbonate Platform: Immediate Response to the Environmental Perturbations Associated With OAE‐2?

Post‐impact event bed (tsunamite) at the Cretaceous–Palaeogene boundary deposited on a distal carbonate platform interior

Drowning of the Triassic Yangtze Platform, South China, By Tectonic Subsidence Into Toxic Deep Waters of An Anoxic Basin

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