Climate controlled, fabric destructive, reflux dolomitization and stabilization via marine- and synorogenic mixed fluids: An example from a large Mesozoic, calcite-sea platform, Croatia

Read, J. Fred; Husinec, Antun; Cangialosi, Michael; Loehn, C.; Prtoljan, Božo

doi:10.1016/j.palaeo.2016.02.015

Cited by 25 publications

(11 citation statements)

References 81 publications

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“…While we have no indication as to where that occurred, we can be sure from the X-ray diffractograms that it did not remain in the biogenic calcite skeleton. If it had, the dolomitization process would have destroyed the original skeletal fabric (Read et al 2016). The original skeletal fabric would also be destroyed if the Mg was being precipitated in situ as the common salt magnesium sulfate as suggested by Balboni et al (2011).…”

Section: Fig 3-changes In A-c) Calcite:aragonite Ratio and D-f)mentioning

confidence: 99%

Pretreatment For Removal of Organic Material Is Not Necessary For X-Ray-Diffraction Determination of Mineralogy In Temperate Skeletal Carbonate

Smith

Key

Henderson

et al. 2016

Journal of Sedimentary Research

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Quantifying the effects of ocean acidification requires understanding the skeletal carbonate mineralogy in living marine organisms. X-ray diffractometry (XRD) is the simplest and most commonly used technique for determining this. Samples being analyzed by XRD are typically pretreated to remove organic material prior to grinding to a crystallite powder. This pretreatment was traditionally performed as organic material may obscure the mineral peaks on XRD traces. This study compared controls with no pretreatment with the most common pretreatment methods: roasting, immersion in chlorine bleach, and immersion in hydrogen peroxide. The latter two methods were performed at two strengths and two durations. We test the hypothesis that bleaching and/or roasting of skeletal carbonate to remove organic material does not affect the mineralogy of temperate skeletal carbonate at a scale detectable by XRD. This was done with biogenic skeletal carbonate from temperate marine environments around southern New Zealand. Specimens included 5 species of bivalve mollusks, 4 species of bryozoans, 2 species of barnacles, as well as 1 species each of serpulid worm, echinoid, gastropod mollusk, brachiopod, and coralline algae. Comparison to the untreated control showed that all pretreatments removed some organic matter and that the presence of organic matter in temperate skeletal carbonate does not affect the ability to qualitatively interpret mineralogy or semiquantitatively measure mineralogy using XRD. Given that pretreatment does not appear to be necessary and that some methods at least can cause unacceptable changes in mineralogy, we recommend that pretreatment for the removal of organic material be abandoned.

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Section: Fig 3-changes In A-c) Calcite:aragonite Ratio and D-f)mentioning

confidence: 99%

Pretreatment For Removal of Organic Material Is Not Necessary For X-Ray-Diffraction Determination of Mineralogy In Temperate Skeletal Carbonate

Smith

Key

Henderson

et al. 2016

Journal of Sedimentary Research

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“…Husinec & Read, 2011). Change from brackish and normal marine waters in the lower Kimmeridgian to hypersaline waters in the upper Kimmeridgian is supported by the change from limestones of the BG section to interlayered limestones and reflux dolomites of the BK section (Read et al ., 2016).…”

Section: Discussionmentioning

confidence: 99%

“…Barren carbonate mudstones (intertidal–restricted very shallow subtidal; rank 2) are unfossiliferous muddy deposits that are structureless, burrow‐homogenized, locally dolomitized units (cf. Hardie, 1977; Read et al ., 2016) that locally contain the fresh to brackish water alga Chara especially in the lower Kimmeridgian BG section.…”

Section: Facies Sequence Stratigraphy and Cyclostratigraphymentioning

confidence: 99%

Assessing Milankovitch forcing in disconformity‐prone cyclic shallow‐water carbonates, Upper Jurassic (Kimmeridgian), Adriatic Platform, Croatia

Husinec

Read

2022

Sedimentology

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Most Upper Jurassic studies of astronomical forcing have focused on deeper‐water sections which are relatively continuous. An Upper Jurassic (Kimmeridgian) section on the greenhouse Adriatic Carbonate Platform, Croatia, was studied to determine if astronomical forcing can be recognized in a 5.8 ± 0.1 Myr duration, disconformity‐prone shallow platform succession. The succession consists of metre‐scale subtidal parasequences intermixed with peritidal parasequences, and intermittent subaerial breccias at sequence boundaries. Ages were constrained by biostratigraphy and δ13C chemostratigraphy, and most sequence boundaries appear to match those of the coastal onlap curve of Haq (2018). Logged sections were converted into depth–rank time series and parasequence–thickness time series. Accumulation rates were statistically evaluated for the rank series against an astronomical‐forcing model, and compared with long‐term accumulation rates (thickness divided by time). The statistical rates were used to select the ca 100 kyr eccentricity cycle to tune the series. Spectral analysis showed peaks at ca 400 kyr (superbundles) and ca 100 kyr (bundles), along with obliquity (38 kyr and 27 kyr) and precessional (18−22 kyr) cycles (parasequences). The Kimmeridgian sequences are ca 400 kyr, ca 800 kyr and ca 1.1 Myr duration. Sequence scale (0.4 to 1.2 Myr) stratigraphic completeness based on statistical accumulation rates versus long‐term rates is ca 60%. This study estimates ca 1 Myr missing time in parasequences stacked into superbundles and 1.6 Myr in four major sequence boundaries. Given that the Kimmeridgian was the hottest time of the Middle and Late Jurassic, aquifer eustasy may have influenced the timing of sequence boundaries, although documented late Kimmeridgian cooling could have triggered a glacio‐eustatic component.

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“…Numerous studies from southern Croatia have described in detail the Upper Jurassic biostratigraphy (e.g., Velić, 1977;Velić and Sokač, 1978;Velić, 2007) Prtoljan et al, 2015;Read et al, 2016). The uppermost Callovian rocks under investigation (Šilješci Unit, thickness ~300 m; Fig.…”

Section: Geologic Settingmentioning

confidence: 99%

Palynofacies and paleoenvironment of the Upper Jurassic mud-supported carbonates, southern Croatia: Preliminary evaluation of the hydrocarbon source rock potential

Koch

Prtoljan

Husinec

et al. 2017

Marine and Petroleum Geology

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Despite the vast research on various aspects of its stratigraphy, relatively little is known about the source-rock potential of the Upper Jurassic Adriatic platform, southern Croatia. Here a case palynological study has been provided to determine the kerogen type, quality, and thermal maturity, and assess its relative hydrocarbon generative potential. Palynofacies characteristics indicate a low-energy, shallow-marine oxygen-depleted setting. The deposited mud-supported carbonates contain organic matter that is almost entirely composed of a fluorescent amorphous organic matter of planktonic and bacterial origin. A high phycomata/dinocyst ratio suggests relative hydrographic stability in an environment favorable for motile-stage dinoflagellate community with reduced production of dinocysts. The lack of anaerobic degradation and very good preservation of lipoid palynomorphs indicates dysoxic conditions; the latter also is suggested by a low proportion of algal-phytoplanktic carbohydrates. The lack of oxygen-deficient zone within the water column, coupled with well-preserved lipoid sediment components, suggests that the boundary between the oxygen-rich and oxygen-poor levels was likely located at/near the sediment-water interface. The palyno-organic facies analysis suggests that the organic matter corresponds to the type II (possibly I/II) kerogen (VRo ~0.3-0.4%) that was protected from degradation before, during and after sedimentation. Well-preserved lipoid components suggest a good hydrocarbon-generative potential, but the low TOC values (<0.1%) of studied outcropping Upper Jurassic carbonates prevent their designation as source rocks. Given the known sourcerock potential of the Upper Jurassic succession in the wider region, further studies of subsurface samples are needed to exclude the Oligocene-recent subaerial weathering as a culprit for the low TOC values.

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Climate controlled, fabric destructive, reflux dolomitization and stabilization via marine- and synorogenic mixed fluids: An example from a large Mesozoic, calcite-sea platform, Croatia

Cited by 25 publications

References 81 publications

Pretreatment For Removal of Organic Material Is Not Necessary For X-Ray-Diffraction Determination of Mineralogy In Temperate Skeletal Carbonate

Pretreatment For Removal of Organic Material Is Not Necessary For X-Ray-Diffraction Determination of Mineralogy In Temperate Skeletal Carbonate

Assessing Milankovitch forcing in disconformity‐prone cyclic shallow‐water carbonates, Upper Jurassic (Kimmeridgian), Adriatic Platform, Croatia

Palynofacies and paleoenvironment of the Upper Jurassic mud-supported carbonates, southern Croatia: Preliminary evaluation of the hydrocarbon source rock potential

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