Origin and paleoecology of Middle Jurassic hiatus concretions from Poland

Zatoń, Michał; Machocka, Sylwia; Wilson, Mark A.; Marynowski, Leszek; Taylor, Paul D.

doi:10.1007/s10347-010-0244-y

Cited by 37 publications

(51 citation statements)

References 73 publications

(125 reference statements)

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“…Merta and Drewniak (1998) and Zatoñ et al (2011) sug gested that some sid er ite ho ri zons might have de veloped along ero sional sur faces. The pres ent study shows that the ero sion of bot tom sed i ment was more com mon, al though it af fected mainly the up per most, soft part of sed i ment col umn and hence, it is dif fi cult to de tect.…”

Section: Discussion Sedimentary Environmentmentioning

confidence: 99%

Storm-influenced deposition and cyclicity in a shallow-marine mudstone succession - example from the Middle Jurassic ore-bearing clays of the Polish Jura (southern Poland)

Leonowicz

2015

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1 Uni ver sity of War saw, In sti tute of Ge ol ogy, ¯wirki i Wigury 93, 02-089 Warszawa, Po land Leonowicz, P., 2015. Storm-in flu enced de po si tion and cyclicity in a shal low-ma rine mudstone suc ces sion -ex am ple from the Mid dle Ju ras sic ore-bear ing clays of the Pol ish Jura (south ern Po land). Geo log i cal Quar terly, 59 (2): 325-344, doi: 10.7306/gq.1221Sedimentological anal y sis of bioturbated mudstones from the Mid dle Ju ras sic ore-bear ing Czêstochowa Clay For ma tion has re vealed com mon rel ics of sed i men tary struc tures, such as thin silt/sand laminae, bed ding-plane ac cu mu la tions of shell debris, small and me dium silt-sand lenses, as well as silt-, sand-and shell-de bris-rich lev els, ac com pa nied by ero sion sur faces and mi nor scours. These fea tures doc u ment pe ri od i cal high-en ergy con di tions of mud de po si tion, in clud ing storm stir ring, event sed i men ta tion and the ac tiv ity of storm-gen er ated bot tom cur rents, which were re spon si ble for sea-floor ero sion and sed i ment sup ply from shal lower parts of the ba sin. The sea bot tom was prev a lently be low the storm wave base, but it rose above it dur ing ex cep tion ally strong storms and in the Early Bathonian zig zag chron when the ba sin ex pe ri enced con sid erable shallowing. The shal low est and high est en ergy con di tions oc curred in the late macrescens subchron, when the bot tom was close to, or above the fair-weather wave base. The es ti mated depth of the sea did not ex ceed sev eral tens of metres, but in some pe ri ods it could be even less than 20 m. Based on the ver ti cal vari a tion of the sand, silt and clay con tents, seven transgressive-re gres sive cy cles have been dis tin guished in the ap prox i mately 75 m thick suc ces sion span ning the Up per Bajocian-Up per Bathonian. Cy cles TR 1 , TR 2+3 , TR 5 and TR 6+7 cor re late with those dis tin guished in the co eval suc ces sion from cen tral Po land, al though the strati graphic po si tion of cy cle bound aries is slightly shifted. These cy cles re cord rel a tive sea level changes that af fected the en tire Pol ish Ba sin. Re gres sions R 2 and R 6 were smaller-scale-events, gen er ated in response to a lo cal tec tonic ac tiv ity and autocyclic shore line progradation.

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Section: Discussion Sedimentary Environmentmentioning

confidence: 99%

Storm-influenced deposition and cyclicity in a shallow-marine mudstone succession - example from the Middle Jurassic ore-bearing clays of the Polish Jura (southern Poland)

Leonowicz

2015

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“…They form five types of tiered ichnofabric with varieties reflecting degree of the association completeness. From cross-cutting relationships, at least four and Zatoń et al (2011Zatoń et al ( , 2012; dated intervals are marked in grey Well-oxygenated, shallow-to deep-water marine environments (Olivero and López Cabrera 2010); the occurrence of Tasselia is controlled by three factors: rapid sedimentation, high suspension input, and soupground consistency of substrate (Wetzel and Bromley 1996) Thalassinoides isp.…”

Section: Results and Interpretationsmentioning

confidence: 99%

“…The opposite tendency is reflected by ichnofabric 3, which records decreased sedimentation rate. Temporal sediment starvation and syndepositional erosion was already postulated in hitherto studies of the ore-bearing clay to explain the origin of horizons of siderite concretions (Witkowska 2012), calcareous hiatus concretions (Zatoń et al 2011) and intervals with common ammonite occurrence (Leonowicz 2015).…”

Section: Sedimentary Environmentmentioning

confidence: 89%

“…This succession spans the interval from the Upper Bajocian parkinsoni zone to the Upper Bathonian retrocostatum zone ( Fig. 2; Wierzbowski 2003, 2006b;Zatoń et al 2011Zatoń et al , 2012.…”

Section: Geological Setting and Lithologymentioning

confidence: 99%

“…This fine-grained succession has been the subject of several geochemical, micropaleontological, and sedimentological studies (e.g., Merta and Drewniak 1998;Marynowski et al 2007;Szczepanik et al 2007;Zatoń et al 2009Zatoń et al , 2011Gedl et al 2012;Leonowicz 2012Leonowicz , 2013Leonowicz , 2015. Geochemical investigations, including analysis of biomarkers, Th/U ratios, DOP and pyrite framboid distribution, indicated oxygenation of the bottom water and reducing conditions within the sediment Szczepanik et al 2007;Zatoń et al 2009).…”

Section: Introductionmentioning

confidence: 97%

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