Diagenesis to very low-grade metamorphism in lower Palaeozoic sediments: A case study from deep borehole Tobolka 1, the Barrandian Basin, Czech Republic

Suchý, Václav; Sandler, Amir; Slobodník, Marek; Sýkorová, Ivana; Filip, Jiřı́; Melka, Karel; Zeman, Antonín

doi:10.1016/j.coal.2014.12.015

Cited by 12 publications

(7 citation statements)

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“…A similar phenomenon has also been noticed in some previous studies (e.g. Aldega et al, 2007;Suchý et al, 2015). This is probably because: (1) the studied mudstone samples contains different types of organic matter, which are characterised by different sensitivities to increasing heating rate (e.g.…”

Section: Accepted Manuscriptsupporting

confidence: 87%

“…This is probably because: (1) the studied mudstone samples contains different types of organic matter, which are characterised by different sensitivities to increasing heating rate (e.g. Cole, 1994;Suchý et al, 2015) (2) compared with organic materials, clay mineral reaction is more sensitive to geological heating rates (for a review, see Frey and Robinson, 1999);.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Paleogene igneous intrusion and its effect on thermal maturity of organic-rich mudstones in the Beibuwan Basin, South China Sea

Liu

Wang

Uysal

et al. 2017

Marine and Petroleum Geology

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The seismic, drilling and logging data reveal that a large-scale igneous intrusion with a width of 14 Km and a maximum thickness of 170 m intruded within the Paleogene Liushagang Formation in the Fushan Depression, Beibuwan Basin, South China Sea (SCS). In this study, we report the geochemistry and Sr-Nd-Pb-Hf isotopic compositions of the igneous rocks, and evaluate the thermal effect induced by this large-scale igneous intrusion on the host rocks. The analyzed igneous samples exhibit strong enrichment in light rare earth elements (LREE) and large-ion lithophile elements (LILE), having characteristics similar to intra-plate oceanic island basalts (OIB). The Sr-Nd-Pb-Hf isotopic data display narrow ranges (e.g. 87 Sr/ 86 Sr i =0.7042~0.7044, 143 Nd/ 144 Nd i =0.5128~0.5129, 206 Pb/ 204 Pb i =18.90~18.94, εHf(t)=+7.56~+9.60). Geochemical and isotopic compositions suggest a mixed mantle source between depleted mid-ocean-ridge-basalt (MORB) mantle (DMM)-like mantle and enriched mantle type II (EMII, possibly the Hainan mantle plume). Vitrinite reflectance values, major mineralogical changes together with a maturity-related biomarker [Ts / (Ts+Tm)] all reveal significant thermal effect induced by the igneous intrusion. Vitrinite reflectance values of the host rock are up to 2.5% in the intrusion region, whereas lower reflectance values (0.62~0.73%) occur in the unaffected area of the same strata. Moreover, our results suggest that the host rocks above the igneous intrusion are characterised by higher maturity than below, which should be attributed to the different behavior of hydrothermal fluids. These observations suggest that the thermal effect of large-scale thick igneous intrusions is much more intense than that of thin igneous intrusions, and the behavior of

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Section: Accepted Manuscriptsupporting

confidence: 87%

Section: Accepted Manuscriptmentioning

confidence: 99%

Paleogene igneous intrusion and its effect on thermal maturity of organic-rich mudstones in the Beibuwan Basin, South China Sea

Liu

Wang

Uysal

et al. 2017

Marine and Petroleum Geology

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“…13). The most characteristic territories are the Barrandian Basin (Prague Basin, corresponding to the Silurian Perunica Terrane), the'Islet Zone', the Železné Hory Mts and the Hlinsko and the Lužice Regions (Suchý et al 2002(Suchý et al , 2015Štorch 1999;Štroch and Kraft 2009). The Silurian succession of the Prague Basin was only slightly deformed (Verniers et al 2008).…”

Section: Regional Correlationmentioning

confidence: 99%

Provenance and Variscan low-grade regional metamorphism recorded in slates from the basement of the (SW Hungary)

Mészáros

Varga

Raucsik

et al. 2019

Int J Earth Sci (Geol Rundsch)

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A metapelitic sequence with Silurian protolith from the Horváthertelend Unit (Tisza Mega-unit, Hungary) has a K-white mica + chlorite + quartz + albite + anatase ± tourmaline mineral assemblage. Moderately developed disjunctive and welldeveloped continuous foliations are present. Geochemical results reflect a dominantly felsic source of the protoliths, suggesting an intermediate to acidic volcanic arc in the provenance area. Metasandstone pebbles in the metaconglomerate indicate a recycled sedimentary source. Raman spectroscopy of carbonaceous material indicates a ~ 350-370 °C peak metamorphic temperature. The Kübler Index (KI Basel ) values of the phengitic K-white mica indicate epizonal metamorphism (0.22 ± 0.04 Δ°2θ). The Chlorite 'Crystallinity' Index (ChC CIS ) suggests metamorphic alteration near to the anchizone-epizone boundary (0.31 ± 0.06 Δ°2θ). K-Ar ages of K-white mica are interpreted as a result of Variscan metamorphism (c. > 310 Ma) and post-Variscan uplift (c. 290 Ma). The predominance of lydite and slate of Llandoverian age and the overlying coarse-grained metagreywacke and metaconglomerate beds of the Szalatnak Slate Formation show strong lithological similarities with the proximal Silurian sequences in the Małopolska Massif (Kielce Region, Holy Cross Mountains, Poland). The original position of the Horváthertelend Unit is presumably to the northeast from the Bohemian Massif, next to the Upper Silesian Block (Moravo-Silesian Zone) and the Małopolska Terrane.

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“…The exact mechanism by which the caves originated remains a matter of ongoing debate [23][24][25][26]. Due to the spatial link between the caves and the hydrothermal calcite veins, the missing relationship of the caves to modern surficial hydrology, the presence of characteristic cupola-form cavities in cave ceilings, and the presence of exotic carbonate-siliceous speleothems, which are strongly similar to those of some presently active hydrothermal caves [27], several studies have suggested that the initial stages of cave development were associated with fracture-bound migration of heated, aggressive hypogene waters that ascended from underlying siliciclastic sedimentary strata [23,24,27,28], (see also [29,30] for geochemical characteristics of Lower Palaeozoic formations that occur at depth, below the caves). At present, however, the caves are cold, with an average annual air temperature of 10.5 • C, and completely devoid of any active water stream.…”

Section: Geological Settingmentioning

confidence: 99%

Gothic-Arch Calcite from Speleothems of the Bohemian Karst (Czech Republic): Its Occurrence, Microscopic Ultrastructure and Possible Mechanism of Growth

et al. 2021

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Gothic arch calcite, a specific crystallographic variety of calcite known from some hot springs and tufa streams, has been newly recognized in the Koněprusy Caves. The gothic-arch calcite occurs on the exteriors of exotic coralloid speleothems where it coexists with scalenohedral (dogtooth) spar crystals. The crystals exhibit microscopic ultrastructural features including deeply eroded topography, etch pits, and spiky and ribbon calcite crystallites, pointing to its extensive natural etching. Many gothic-arch calcites originated as late-stage, secondary overgrowths on older, etched dogtooth calcite crystals. Its characteristic outward curvature resulted from the recrystallization of etching-liberated fine carbonate grains and newly formed needle-fiber calcite laths, which were accumulated and bound on the faces and at the bases of corroded crystals. These intimately coexisting destructive and constructive processes of carbonate crystal corrosion and growth were probably mediated by bacteria, fungi, or other microorganisms. Fluid inclusions embedded in calcite crystals point to a vadose setting and temperatures below ~50 °C. This, combined with the wider geological context, indicates that the gothic arch calcite crystals originated only during the late Pleistocene to Holocene epochs, when the cave, initially eroded by hypogene fluids in the deeper subsurface, was uplifted to the subaerial setting and exposed to the meteoric waters seeping from the topographic surface. The radiocarbon analysis shows that gothic-arch calcite crystals are generally older than ~55,000 years, but the surface layers of some crystals still reveal a weak 14C activity, suggesting that microbiologically mediated alterations of the speleothems may have been occurring locally until now.

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Diagenesis to very low-grade metamorphism in lower Palaeozoic sediments: A case study from deep borehole Tobolka 1, the Barrandian Basin, Czech Republic

Cited by 12 publications

References 88 publications

Paleogene igneous intrusion and its effect on thermal maturity of organic-rich mudstones in the Beibuwan Basin, South China Sea

Paleogene igneous intrusion and its effect on thermal maturity of organic-rich mudstones in the Beibuwan Basin, South China Sea

Provenance and Variscan low-grade regional metamorphism recorded in slates from the basement of the (SW Hungary)

Gothic-Arch Calcite from Speleothems of the Bohemian Karst (Czech Republic): Its Occurrence, Microscopic Ultrastructure and Possible Mechanism of Growth

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