Maciej Bojanowski- Dr hab.
- Professor (Associate) at Polish Academy of Sciences
Maciej Bojanowski
- Dr hab.
- Professor (Associate) at Polish Academy of Sciences
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47
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Introduction
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January 2014 - present
December 2000 - December 2013
Publications
Publications (47)
Gas hydrate represents a geological, environmental, and climatic hazard. The risks related to gas hydrate can be better evaluated with a well-constrained knowledge about its occurrence in Earth’s history. However, the understanding of gas hydrate in the geological past is very limited due to the paucity of insights that this compound leaves in the...
The Maastrichtian (~72–66 Ma), the final stage of the Cretaceous, experienced long-term cooling with high atmospheric CO₂ and weak latitudinal temperature gradients. Tectonic movements and variations in climate lead to sea-level changes and dynamic ocean conditions. This background probably affected the seawater circulation regime of the shallow ep...
Shallow marine thrombolites from a newly discovered Lower Cretaceous cold seep in the Outer Carpathians (Poland) were analysed in order to untangle the complex sedimentological and biogeochemical processes involved in their formation and their diagenetic modifications. The studied thrombolites are made of two components: (i) microcrystalline mesocl...
Fragments of marble revetment and floor slabs as well as some broken statuary and vessels were recovered from the excavation of a Roman temple in the harbor town of Berenike on the Red Sea coast of Egypt. Petrographic analyses, including optical, cathodoluminescence, and scanning electron microscopy as well as isotopic analyses (δ ¹³ C, δ ¹⁸ O, ⁸⁷...
The Cretaceous provides us with an excellent case history of ocean-climate-biota system perturbations. Such perturbations occurred several times during the Cretaceous, such as oceanic anoxic events and the end-Cretaceous mass extinction, which have been the subject of an abundant literature. Other perturbations, such as the mid-Maastrichtian Event...
Calcium carbonate minerals produced by marine organisms play a central role in the global carbon cycle and carbonate sedimentation, which influence the climate by regulating atmospheric CO2 levels. Foraminifera are important marine single-celled organisms that have produced calcite shells for over 300 million years. Here, we present new observation...
The paper presents the results of the archaeometric investigation, conducted for the first time with the use of a wide range of analytical methods, on white and grey marbles exploited in the so‐called City and Regional Quarries of Aphrodisias (south‐western Turkey). The research, based on a multi‐method approach and performed on a representative se...
Fine-grained sedimentary carbonates are important climatic archives. Recognizing the effects of post-deposi-tional modification of such rocks is, therefore, crucial for the assessment of fidelity of these archives. Early-di-agenetic carbonate concretions, typically also composed of microcrystalline carbonate and preserving original depositional fab...
The sedimentary cover of the western part of the East European Craton contains records of glacial periods. Their age has been constrained untill recently by 1000 Ma detrital zircons and overlying basalts of the Volyn Large Igneous Province, dated at c. 580 Ma. In Belarus, the dolomitic Lapichi Svita is sandwiched locally between the glacial and per...
The Ediacaran sedimentary rocks on the East European Craton (EEC) comprise chiefly siliciclastic deposits of the Volyn and Valdai series that have commonly been regarded as deposits in a shallow epicontinental sea on Baltica. However, an intermittent fresh-water sedimentary setting was also indicated for some part of the paleocontinent. Surprisingl...
Meso- and Neoproterozoic paleosols, collected from different areas of the East European Craton: Belarus, Estonia, Lithuania, and Ukraine, offer a chance to examine continental weathering sequences from early to advanced stages of weathering on a variety of different parent materials such as gneisses, granites, gabbros and amphibolites. They were st...
The widespread expansion of the oxygen minimum zone onto shelves has been commonly regarded as a primary cause of benthos extinction in epicratonic sea ecosystems during the Cenomanian–Turonian boundary event (CTBE). However, neither lithology, geochemical proxies, nor micropaleontological data support this hypothesis. Instead, our integrated foram...
Radish concretions exhibit a typical columnar to pear-shaped, stipe downward geometry. In Middle Jurassic mudrock in south-west Germany, radish concretions started to form around an iron-sulphide lined tube by pervasive cementation constituting an ellipsoidal parent domain in uncompacted sediment at burial depths of ≤ 5 to 8 m as recorded by 75 to...
This study addresses new paleomagnetic, geochemical, mineralogical, and rock-magnetic data from four drill cores of the western part of the East European Craton, representing mainly siliciclastics supplemented by volcaniclastics and a few basaltic rock samples. The cores comprise Mesoproterozoic samples of 1400–1030 Ma and Neoproterozoic (Ediacaran...
Sedimentological, biostratigraphic, petrographic, and stable C and O isotope study was carried out on chaotic complexes hosting carbonate concretions in the uppermost Oligocene successions of the Outer Carpathians. These chaotic complexes reveal a range of sedimentary features indicative of intrabasinal, submarine mass-wasting deposition, including...
The damage zones of exhumed strike-slip faults dissecting Jurassic carbonates in the southwestern part of the Late Palaeozoic Holy Cross Mountains Fold Belt reveal second-order faults and fractures infilled with syntectonic calcite. The subsequent development of a structural pattern of microscopic fault-related structures and calcite infillings ref...
The provenance of marbles used for ancient statuary and architecture is of utmost importance for archaeologists, art historians and archaeometrists. The aim of this paper is to provide a comprehensive characterisation of the white marble exploited in antiquity in G€ oktepe (Mu� gla Province, Turkey) to increase the reliability for identifying this...
Ediacaran siderite-bearing sedimentary rocks from the western part of the East European craton exhibit features typical of redoximorphic paleosols, including pedogenic siderite (e.g., sphaerosiderite) with uniform and negative δ18O and highly variable δ13C values. The siderite precipitated in water-logged soils in a hot and humid climate, and repre...
The Silurian Pelplin Formation is a part of a thick, mud-prone distal fill of the Caledonian foredeep, which stretches along the western margin of the East European Craton. The Pelplin Formation consists of organic carbon- rich mudstones that have recently been the target of intensive investigations, as they represent a potential source of shale ga...
The Silurian Pelplin Formation is a part of a thick, mud-prone distal fill of the Caledonian foredeep, which stretches along the western margin of the East European Craton. The Pelplin Formation consists of organic car-bon-rich mudstones that have recently been the target of intensive investigations, as they represent a potential source of shale ga...
Archaeo-geological investigation of marble quarries of the ancient city of Aphrodisias in west Anatolia.
Four isochronous Oligocene coccolith limestone horizons from the Carpathians were examined in order to reconstruct paleoceanographic conditions in the Central Paratethys. The dominance of small and size-uniform pyrite framboids, the occurrence of low-diversity dinoflagellate cysts and coccolithophorids and the presence of biomarker molecule 28,30-d...
Ca. 548 Ma old paleosols developed on Ediacaran basalts and almost unaltered by diagenesis were discovered and sampled from several core profiles in Volyn (NW Ukraine). Their mineral composition, elemental geochemistry (major and trace, including REE, plus Fe²⁺/Fe³⁺ ratio by Mössbauer spectroscopy), stable isotope geochemistry (O and C in carbonate...
The Neogene sedimentary succession of the Orava-Nowy Targ Basin directly overlies the Central Carpathian Paleogene Basin deposits, the Magura Unit, and the Pieniny Klippen Belt. It provides an excellent geological record that postdates the main Mesoalpine structural and geomorphological processes in the Western Carpathians. Sedimentological, petrog...
The research project "Marmora Asiatica" aims to develop an extensive database of petrographic and geochemical characteristics of white and grey crystalline marbles from several quarries of Asia Minor. This data base will be a GIS-based internet application accessible to all scholars. A joint Polish-Turkish archaeology-geology research team has carr...
Exceptionally well preserved chalk from the Mielnik section in eastern Poland has been analyzed for Sr, C and O isotope composition recorded in bulk rock samples, belemnite rostra, hand-picked benthic foraminifera and separated fine fractions (incl. calcareous nannoplankton and calcite cements). The stratigraphic δ¹³C and δ¹⁸O trends are consistent...
Sedimentological, mineralogical, stable carbon and oxygen isotope determinations and biomarker analyses were performed on siderite concretions occurring in terrestrial silts to understand their formation and to characterize the sedimentary and diagenetic conditions favouring their growth. High δ¹³C values (6.4‰ on average) indicate that siderite pr...
Coal and hydrocarbons have been exploited from the Carboniferous rocks of the Midland Valley for over 200 years. This work characterises organic matter from the Mississippian black shales of the Midland Valley from Wardie, Scotland. Biomarker analysis allowed the estimation of the degree of microbial transformation of organic matter, type of keroge...
Carbonate concretions formed in bathyal and deeper settings have been studied less frequently than those formed in shallow-marine deposits. Similarly, concretions affected by catagenetic conditions have rarely been reported. Calcite concretions in deep-marine mudstones and graywackes of the Bardo Unit (Sudetes Mountains, Poland) formed during early...
The Mississippian shales from Wardie (Scotland) were deposited in a large normally brackish-water basin. They host siderite concretions with d13C values ranging from 23.5 to 12.1% which show that sulfate reduction and methanogenesis contributed to the production of bicarbonate. Fossils are found within each of the concretions, suggesting that the d...
Zircon occurs in voids and cracks in phosphatic coprolites enclosed in siderite concretions in Mississippian shales near Edinburgh, Scotland. The zircon formed during hydrothermal alteration of early-diagenetic concretions and occurs as spherical aggregates of prismatic crystals, sometimes radiating. Vitrinite reflectance measurements indicate temp...
We describe a new specimen of a supposed Paleozoic tetrapod body impression from the Lower Permian Słupiec Formation in the Intra-Sudetic Basin, Poland. The size, integument morphology of belly and part of tail imprints, and the morphology of a well-preserved pes track diagnose the specimen and readily distinguish it from other described specimens...
A 20-cm thick laminated limestone of Oligocene age from the Outer Carpathians is composed mainly of coccoliths and authigenic calcite. δ13C values unequivocally indicate that the authigenic calcite precipitated as a result of methane oxidation. The δ13C and δ18O values change gradually from the base to the top of the bed from − 38.0‰ to − 17.6‰ and...
Organic-walled dinoflagellate cysts as a tool to recognize carbonate concretions: an example from Oligocene flysch deposits of the Western Carpathians
Carbonate concretions found within the Krosno shales (Polish Outer Carpathians) have formerly been interpreted as limestone exotics. Both the concretions and the host shales yield well preserved orga...
The Krosno Formation of the Outer Carpathians is composed of synorogenic deposits laid down in the Silesian foredeep basin
in front of an accretionary prism. The Oligocene shales of the Krosno Formation from Świątkowa Wielka (the Polish part of
the Outer Carpathians) contain numerous authigenic carbonate rocks: concretions, a laminated limestone be...
The Krosno shales were deposited synorogenically in front of an accretionary prism as interchannel flysch facies on a north-dipping slope that constituted the southern marginal part of the Silesian basin. The turbidite flows originated from channelised currents and probably also as separate sedimentation events from slow, dilute “sheet” flows deriv...
Calcite concretions are found within flysch shales. They display a wide spectrum of structures, which allows precise determination of concretionary growth mechanisms and burial conditions during their formation. Microscopic methods, including BSEM, revealed displacive growth of calcite cement and residual intercrystalline porosity. Therefore, cemen...
Several types of carbonate concretions were collected from the flysch Krosno shales (upper Eocene-uppermost Oligocene). This paper describes the most characteristic type-laminated concretions. They are discoidal to ellipsoidal in shape and consist of two types of laminae: brown marly, and gray calcium carbonate ones. Apart from micritic calcite (pr...
Questions
Questions (2)
I am searching for information concerning the oldest confirmed occurrence of pedogenic siderite, eg. sphaerosiderite. There are numerous reports from Phanerozoic, but what about Neoproterozoic? Pedogenic siderite forms in reducing, water-logged soils, where degradation of organic matter takes place. It requires high atmospheric pCO2 and accumulation of organic matter on land. Is it possible that such conditions developed in Neoproterozoic?
The session is entitled "Diagenetic imprint on primary sedimentary features", but contributions generally related to diagenesis are welcome. The session will be chaired by Rudy Swennen and me and abstract submission is extended to 15th March. The IAS meeting is organized in Cracow - an architectural pearl among the medieval European cities.
