prikaz prve stranice dokumenta Paleoenvironmental and paleoclimatic changes during the deposition of Upper Jurassic bauxites and their immediate cover: case study of the Rovinj bauxite pit, Istria, Croatia
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Scientific paper - Abstract
Paleoenvironmental and paleoclimatic changes during the deposition of Upper Jurassic bauxites and their immediate cover: case study of the Rovinj bauxite pit, Istria, Croatia
In: Abstracts book / 36th International Meeting of Sedimentology. Zagreb: Croatian Geological Society (HGD), 2023. pp. 419. urn:nbn:hr:169:996522
Perković, Ivor; Durn, Goran; Cvetko Tešović, Blanka; Škapin, Srečo D.; Matešić, Darko; Vlahović, Igor; Martinuš, Maja; Mihovilović, Milan; He, Tianchen; Newton, Robert J.

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Paleoenvironmental and paleoclimatic changes during the deposition of Upper Jurassic bauxites and their immediate cover: case study of the Rovinj bauxite pit, Istria, Croatia | Conference presentation

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Perković, I., Durn, G., Cvetko Tešović, B., Škapin, S. D., Matešić, D., Vlahović, I. ... Newton, R. J. (2023). Paleoenvironmental and paleoclimatic changes during the deposition of Upper Jurassic bauxites and their immediate cover: case study of the Rovinj bauxite pit, Istria, Croatia. Abstracts book / 36th International Meeting of Sedimentology (p. 419). Zagreb: Croatian Geological Society (HGD). Retrieved from https://urn.nsk.hr/urn:nbn:hr:169:996522

Perković, Ivor, et al. "Paleoenvironmental and paleoclimatic changes during the deposition of Upper Jurassic bauxites and their immediate cover: case study of the Rovinj bauxite pit, Istria, Croatia." Abstracts book / 36th International Meeting of Sedimentology, Croatian Geological Society (HGD), 2023, p. 419. https://urn.nsk.hr/urn:nbn:hr:169:996522

Perković, Ivor, Goran Durn, Blanka Cvetko Tešović, Srečo D. Škapin, Darko Matešić, Igor Vlahović, Maja Martinuš, Milan Mihovilović, Tianchen He and Robert J. Newton. "Paleoenvironmental and paleoclimatic changes during the deposition of Upper Jurassic bauxites and their immediate cover: case study of the Rovinj bauxite pit, Istria, Croatia." In Abstracts book / 36th International Meeting of Sedimentology, 419. Zagreb: Croatian Geological Society (HGD), 2023. Accessed 2024 December 23. https://urn.nsk.hr/urn:nbn:hr:169:996522

Perković, I., et al. (2023) 'Paleoenvironmental and paleoclimatic changes during the deposition of Upper Jurassic bauxites and their immediate cover: case study of the Rovinj bauxite pit, Istria, Croatia', Abstracts book / 36th International Meeting of Sedimentology, Croatian Geological Society (HGD), Zagreb, p. 419. Available at: https://urn.nsk.hr/urn:nbn:hr:169:996522 (Accessed 23 December 2024)

Perković I, Durn G, Cvetko Tešović B, Škapin SD, Matešić D, Vlahović I, and sur.. Paleoenvironmental and paleoclimatic changes during the deposition of Upper Jurassic bauxites and their immediate cover: case study of the Rovinj bauxite pit, Istria, Croatia. Abstracts book / 36th International Meeting of Sedimentology. Zagreb: Croatian Geological Society (HGD); 2023. Pp. 419-419. [cited 2024 December 23] Available at: https://urn.nsk.hr/urn:nbn:hr:169:996522

I. Perković, et al., "Paleoenvironmental and paleoclimatic changes during the deposition of Upper Jurassic bauxites and their immediate cover: case study of the Rovinj bauxite pit, Istria, Croatia", Abstracts book / 36th International Meeting of Sedimentology Zagreb: Croatian Geological Society (HGD), 2023. [Online] Available at: https://urn.nsk.hr/urn:nbn:hr:169:996522 [Accessed: 23 December 2024]

Metadata
Title (english)Paleoenvironmental and paleoclimatic changes during the deposition of Upper Jurassic bauxites and their immediate cover: case study of the Rovinj bauxite pit, Istria, Croatia
AuthorIvor Perković
AuthorGoran Durn
AuthorBlanka Cvetko Tešović
AuthorSrečo D. Škapin https://orcid.org/0000-0001-8071-0421
AuthorDarko Matešić
AuthorIgor Vlahović
AuthorMaja Martinuš
AuthorMilan Mihovilović
AuthorTianchen He https://orcid.org/0000-0001-8975-8667
AuthorRobert J. Newton https://orcid.org/0000-0003-0144-6867
Author's institutionUniversity of Zagreb
Faculty of Mining, Geology and Petroleum Engineering
(Department of Mineralogy, Petrology and Mineral Resources)
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Geology
Abstract (english)
The aim of this study was the reconstruction of paleoclimatic and paleoenvironmental changes which occurred during the deposition of Upper Jurassic bauxite, and their cover beds, which comprise a cyclic alternation of clays, limestones, and black pebble breccias. Clay and bulk mineralogy, geochemistry and micromorphology of bauxites and clays was studied using XRPD, SEM-EDS, ICP-MS, XRF, AAS and petrography. The bauxite is composed from haematite, boehmite and kaolinite with variable amounts of 14 Å clay, illite and titanium oxides. The composition of major oxides is consistent with the mineralogical composition and is uniform throughout the profile. The values of rare earth elements and variations in the trace element values displayed differences throughout the bauxite profile, distinguishing two bauxite sections, both capped by two clay illuviation rich horizons. The upper section has numerous erosional features and clastic bauxite beds, which when coupled with its different trace elemental fingerprint indicates its deposition over the older pelitomorphic section. This change is likely a consequence of a paleoclimatic shift towards a more seasonal climate during the formation of the younger part of the bauxite. This can be related to the oscillating transgression succeeding the bauxite formation, which is recorded in the cyclical beds covering the bauxite. The clays from the cover beds are composed from dioctahedral vermiculite, kaolinite, illite and a mixed-layer clay mineral (MLCM) consisting of illite and dioctahedral 14 Å phyllosilicate. The increase in illite and MLCM over kaolinite and the increase in Sr/Ba ratio along the profile, indicate a change from a lacustrine towards a marine environment. The iron speciation data supports this, as it recorded the redox changes which indicate a transition from a closed lacustrine environment to an open marine environment. Overall, the study of both bauxites and their cover, allowed a detailed reconstruction of a late Kimmeridgian transgression that followed a terrestrial phase in this part of the Adriatic carbonate platform. This work has been fully supported by Croatian Science Foundation under the project IP-2019-04-8054 – Wian- Lab (Western Istrian Anticline as an Ideal Natural Laboratory for the Study of the Regional Unconformities in Carbonate Rocks).
Languageenglish
Publication typeScientific paper - Abstract
Publication statusPublished
Peer reviewPeer review - international
Publication versionPublished version
Publication titleAbstracts book / 36th International Meeting of Sedimentology
Numberingp. 419
ISBN978-953-6907-79-3
URN:NBNurn:nbn:hr:169:996522
Publication2023
ProjectNumber: IP-2019-04-8054
Title (croatian): Zapadnoistarska antiklinala kao idealni prirodni laboratorij za proučavanje regionalnih diskordancija u karbonatnim stijenama
Acronym: WIANLab
Leader: Goran Durn
Jurisdiction: Croatia
Funding stream: IP
ConferenceTitle: 36th International Meeting of Sedimentology
Acronym: IAS
Location: Dubrovnik, Croatia
Organizer: Croatian Geological Society (HGD)
Organizer: International Association of Sedimentologists (IAS)
Start date: 2023-06-12
End date: 2023-06-16
Assembly type: Poster
Document URLhttps://iasdubrovnik2023.org/index.php
Type of resourceText
PublisherCroatian Geological Society (HGD)
Publishing placeZagreb
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2023-09-28 09:20:32