Stable isotope records (O, C) of Jurassic aragonitic shells from England and NW Poland: palaeoecologic and environmental implications

Malchus, Nikolaus; Steuber, Thomas

doi:10.1016/s0016-6995(02)00007-4

Cited by 40 publications

(18 citation statements)

References 23 publications

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“…Wierzbowski and Joachimski (2007) suggested that the low temperatures inferred from their isotopic studies of marine shells could have been caused by low salinity of the surface waters in which the shells were precipitated (see Gedl et al 2006a, b, c). Palaeotemperatures obtained by Malchus and Steuber (2002) from coeval strata of north-west Poland are much higher (18-27˚C), suggesting warmer conditions, which fit our interpretation much better.…”

Section: Palynofacies Of Middle Jurassic Ore-bearing Clays 343supporting

confidence: 75%

Palynofacies from Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland, with special emphasis on sporomorph eco-groups

Gedl¹,

Ziaja²

2012

Acta Geologica Polonica

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Gedl, P. and Ziaja, J. 2012. Palynofacies from Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków- Silesia Homocline, Poland, with special emphasis on sporomorph eco-groups. Acta Geologica Polonica, 62(3), 325-349. Warszawa. The palynological organic matter of dark clays from Bathonian ore-bearing clays exposed at Gnaszyn (Częstochowa, Kraków-Silesia Homocline, Poland) consists of high proportions of land-derived particles; aquatic elements (mainly dinoflagellate cysts) are comparatively rare. Terrestrial particles include black opaque phytoclasts, dark brown phytoclasts, cuticle remains and subordinate sporomorphs. The latter are represented by eighty-four taxa of spores and pollen grains. They represent various groups of plants, including Bryophyta, Sphenophyta, Lycophyta, Pteridophyta, Pteridospermophyta, Cycadophyta or Ginkgophyta and Coniferophyta. The most frequent sporomorphs in almost all samples from Gnaszyn are Callialasporites (Araucariaceae), Cerebropollenites and Perinopolleniteselatoides (Taxodiaceae) pollen grains, fern spores with triradiate tetrad mark, bisaccate pollen grains belonging to conifers (Pinaceae or Podocarpaceae) and also to Pteridospermophyta. Quantitative analysis of the palynofacies shows fluctuations of particular element ratios, which correlate with lithology. Clay intervals that contain siderite concretion levels yielded lower amounts of cuticles in relation to sporomorphs (mainly pollen grains) and dinoflagellate cysts. Intervals of monotonous clays and silts are characterized by a higher ratio of cuticles in relation to other elements, especially dinoflagellate cysts. Also, quantitative analysis of the sporomorphs shows changes in frequency of the representatives of various plant communities, which coexisted during the Jurassic: Upland, Lowland, River, Pioneer, Coastal and Tidally-influenced. These changes might have reflected sealevel fluctuations, which affected vegetation growing on adjacent land. However, the dominance of Callialasporites pollen grains, which belong to the Coastal community, indicates that the Gnaszyn assemblage was mainly influenced by the seashore vegetation. The high frequency of Araucariaceae pollen grains and the presence of ferns representing the Osmundaceae, Cyatheaceae, Dicksoniaceae, Schizeaceae, Gleicheniaceae and Matoniaceae indicate a warm climate without large seasonal amplitudes during the deposition of the Gnaszyn succession.

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Section: Palynofacies Of Middle Jurassic Ore-bearing Clays 343supporting

confidence: 75%

Palynofacies from Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland, with special emphasis on sporomorph eco-groups

Gedl¹,

Ziaja²

2012

Acta Geologica Polonica

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“…Malchus and Steuber (2002) inferred ~18-27˚C for the bottom (benthos) and ~17˚C for the surface waters (ammonoids); whereas Wierzbowski and Joachimski (2007) inferred ~4-9.5˚C for the bottom (trigoniids) and ~16-22˚C for surface waters (ammonoids). However, we should emphasize that the record of surface water temperature provided by Malchus and Steuber (2002) was obtained from a single ammonoid shell which provided values lower than the coeval benthic bivalves, and this casts some doubts on this record. The discrepancy in benthic water temperatures between those provided by Malchus and Steuber (2002) and by Wierzbowski and Joachimski (2007) may have resulted, at last partially, from the much shallower, coastal setting of the Middle Bathonian sediments in NW Poland (at Kłęby) compared to the more offshore setting of the ore-bearing clays, and, as argued by Wierzbowski and Joachimski (2007) from a slightly different equation used for the calculation of temperatures from isotope ratios.…”

Section: Terrestrial Influx and Bottom Water Aerobic Conditionsmentioning

confidence: 99%

Section: Terrestrial Influx and Bottom Water Aerobic Conditionsmentioning

confidence: 99%

“…The temperatures of sea water in the Middle Bathonian of Poland were investigated by Malchus and Steuber (2002) and Wierzbowski and Joachimski (2007) based on the carbon and oxygen isotopic ratios from marine calcareous fossils. Malchus and Steuber (2002) studied fossils from NW Poland (Kłęby) while Wierzbowski and Joachimski studied fossils from the ore-bearing clays in the Częstochowa and Wieluń regions. Malchus and Steuber (2002) inferred ~18-27˚C for the bottom (benthos) and ~17˚C for the surface waters (ammonoids); whereas Wierzbowski and Joachimski (2007) inferred ~4-9.5˚C for the bottom (trigoniids) and ~16-22˚C for surface waters (ammonoids).…”

Section: Terrestrial Influx and Bottom Water Aerobic Conditionsmentioning

confidence: 99%

“…Malchus and Steuber (2002) studied fossils from NW Poland (Kłęby) while Wierzbowski and Joachimski studied fossils from the ore-bearing clays in the Częstochowa and Wieluń regions. Malchus and Steuber (2002) inferred ~18-27˚C for the bottom (benthos) and ~17˚C for the surface waters (ammonoids); whereas Wierzbowski and Joachimski (2007) inferred ~4-9.5˚C for the bottom (trigoniids) and ~16-22˚C for surface waters (ammonoids). However, we should emphasize that the record of surface water temperature provided by Malchus and Steuber (2002) was obtained from a single ammonoid shell which provided values lower than the coeval benthic bivalves, and this casts some doubts on this record.…”

Section: Terrestrial Influx and Bottom Water Aerobic Conditionsmentioning

confidence: 99%

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Palaeoenvironmental reconstruction of Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland

Gedl¹,

Kaim²,

Leonowicz³

et al. 2012

Acta Geologica Polonica

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Multidisciplinary studies of the Middle-Upper Bathonian ore-bearing clays at Gnaszyn revealed variable palaeoenvironmental conditions during the deposition of this seemingly monotonous sequence. We interpret the conditions in the bottom environment and the photic zone, and also evaluate the influence of the adjacent land areas, based on sedimentology, geochemistry, sporomorphs and palynofacies composition, benthic (foraminifera, gastropods, bivalves, scaphopods, echinoderms), planktonic (calcareous nannoplankton, dinoflagellate cysts), and nektonic (sharks) fossils. The Gnaszyn succession originated relatively close to the shore, within reach of an intense supply of terrestrial fine clastic and organic particles. The latter are mainly of terrestrial origin and range from 1.5 to 2.5 wt.%. The precise water depth is difficult to estimate but most likely ranges from several tens of metres to a few hundred metres. All fossil groups show minor changes throughout the succession. As the climate seems to have been quite stable during this period we consider sea-level fluctuations to have been the main factor responsible for the changes. The terrestrial input, including freshwater and land-derived clastic and organic particles (sporomorphs and cuticles), increased during periods of sea-level lowstand. As a consequence, stress conditions (lower salinity, higher nutrient availability, lower water transparency) in the photic zone caused blooms of opportunistic planktonic taxa. Furthermore, a faster sedimentation rate led to oxygen depletion and deterioration of the living conditions in the bottom environment due to an increased accu-

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Stable isotope analyses of belemnites from the Kachchh Basin, western India: paleoclimatic implications for the Middle to Late Jurassic transition

Alberti

Fürsich

Pandey

et al. 2011

Facies

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Stable isotope records (O, C) of Jurassic aragonitic shells from England and NW Poland: palaeoecologic and environmental implications

Cited by 40 publications

References 23 publications

Palynofacies from Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland, with special emphasis on sporomorph eco-groups

Palynofacies from Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland, with special emphasis on sporomorph eco-groups

Palaeoenvironmental reconstruction of Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland

Stable isotope analyses of belemnites from the Kachchh Basin, western India: paleoclimatic implications for the Middle to Late Jurassic transition

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