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  • 1
    Online Resource
    Online Resource
    Data_Sheet_1.pdf
    Frontiers Media SA ; 2021
    In:  Frontiers in Earth Science Vol. 9 ( 2021-5-12)
    Details
    In: Frontiers in Earth Science, Frontiers Media SA, Vol. 9 ( 2021-5-12)
    Abstract: The Opalinus Clay is notable in Switzerland as being the selected host rock for deep geological disposal of radioactive waste. Since the early 1990’s, this argillaceous mudstone formation of Jurassic age has been intensively studied within the framework of national and international projects to characterize its geological, hydrological, mechanical, thermal, chemical, and biological properties. While there is no formal stratigraphic subdivision, the Opalinus Clay lithology is classically divided into several, dam- to m-scale sub-units (or facies), depending on location. Recent multi-proxy studies (combining petrographic, petrophysical, geochemical, and mineralogical analyses) have however demonstrated that high, intra-facies, lithological heterogeneity occurs at the dm- to cm-scale. To constrain this small-scale heterogeneity into distinct lithological units (subfacies), the present study aims at defining and presenting a convenient subfacies classification scheme covering the overall Opalinus Clay lithology across northern Switzerland. Petrographic (macro- and microfacies), mineralogical (X-ray diffraction) and textural (image analysis, machine learning and 3D X-ray computed tomography) analyses are performed on diverse drill cores from the Mont Terri rock laboratory (northwestern Switzerland), and results are extended further to the east (Riniken, Weiach, and Benken). Most of the investigated Opalinus Clay can be described by the use of five distinctive subfacies types (SF1 to SF5), which are visually and quantitatively distinguishable by texture (grain size, bedding, fabric, and color) and composition (nature and mineralogy of components). The five subfacies types can be further refined by additional attributes and sedimentary characteristics (biogenic, diagenetic, and structural). Eventually, the widespread and consistent use of standardized Opalinus Clay subfacies types provides the means to harmonize petrographic descriptions within multidisciplinary research projects, enhance reproducibility of in situ experiments, and further evidence the tight relations between lithology and various rock properties.
    Type of Medium: Online Resource
    ISSN: 2296-6463
    URL: Article
    URL: Article
    DOI: 10.3389/feart.2021.645596
    DOI: 10.3389/feart.2021.645596.s001
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2021
    detail.hit.zdb_id: 2741235-0
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  • 2
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    Ocean current intensification during the Cretaceous oceanic anoxic event 2 – evidence from the northern Tethys
    Wiley ; 2015
    In:  Terra Nova Vol. 27, No. 2 ( 2015-04), p. 147-155
    Details
    In: Terra Nova, Wiley, Vol. 27, No. 2 ( 2015-04), p. 147-155
    Abstract: Mesozoic Oceanic Anoxic Events (OAEs) are expressions of major physical oceanographic changes at times of perturbation of the global carbon cycle. A northern Tethyan record of OAE2 is preserved in expanded Cenomanian–Turonian pelagic limestone sections (Seewen Formation) in Eastern Switzerland. The new carbonate carbon‐isotope stratigraphy extracted from these limestones demonstrates that the OAE2 is condensed in all the studied successions and only the onset of the δ 13 C excursion (5.0‰) is present. The condensed interval is characterized by dissolution features, which are filled by a glauconite quartz sandstone. This bed is overlain by a well‐sorted sandstone with intercalated limestone pebbles (Götzis Member), which can be compared with palimpsest sands forming today along current‐swept shelves. The wide distribution of this thin sandstone layer within OAE2 indicates that an intense, erosive, east‐west trending shelf current was active during the highest sea level and most extreme carbon‐cycle perturbation of the OAE2.
    Type of Medium: Online Resource
    ISSN: 0954-4879 , 1365-3121
    URL: Issue
    URL: Article
    DOI: 10.1111/ter.2015.27.issue-2
    DOI: 10.1111/ter.12142
    RVK:
    TE 1000
    Language: English
    Publisher: Wiley
    Publication Date: 2015
    detail.hit.zdb_id: 1000080-X
    detail.hit.zdb_id: 2020958-7
    SSG: 13
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  • 3
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    Photolysis of Caged Inositol Pyrophosphate InsP8 Directly Modulates Intracellular Ca2+ Oscillations and Controls C2AB Domain Localization
    American Chemical Society (ACS) ; 2020
    In:  Journal of the American Chemical Society Vol. 142, No. 24 ( 2020-06-17), p. 10606-10611
    Details
    In: Journal of the American Chemical Society, American Chemical Society (ACS), Vol. 142, No. 24 ( 2020-06-17), p. 10606-10611
    Type of Medium: Online Resource
    ISSN: 0002-7863 , 1520-5126
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    DOI: 10.1021/jacs.0c01697
    DOI: 10.1021/jacs.0c01697.s001
    DOI: 10.1021/jacs.0c01697.s002
    DOI: 10.1021/jacs.0c01697.s003
    DOI: 10.1021/jacs.0c01697.s004
    DOI: 10.1021/jacs.0c01697.s005
    DOI: 10.1021/jacs.0c01697.s006
    DOI: 10.1021/jacs.0c01697.s007
    RVK:
    VA 1120 ; VA 1752
    Language: English
    Publisher: American Chemical Society (ACS)
    Publication Date: 2020
    detail.hit.zdb_id: 1472210-0
    detail.hit.zdb_id: 3155-0
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  • 4
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    A tsunamigenic delta collapse and its associated tsunami deposits in and around Lake Sils, Switzerland
    Springer Science and Business Media LLC ; 2021
    In:  Natural Hazards Vol. 107, No. 2 ( 2021-06), p. 1069-1103
    Details
    In: Natural Hazards, Springer Science and Business Media LLC, Vol. 107, No. 2 ( 2021-06), p. 1069-1103
    Abstract: Large lacustrine mass movements and delta collapses are increasingly being considered as potential tsunamigenic sources and therefore hazardous for the population and infrastructure along lakeshores. Although historical reports document tsunami events in several lakes in Switzerland, and although the propagation of lake tsunamis has been studied by numerical wave modeling, only little is known about on- and offshore lacustrine tsunami deposits. In Lake Sils, Switzerland, a large prehistoric mass-movement deposit originating from the Isola Delta with a minimum estimated volume of 6.5 × 10 6  m 3 and a basinal thickness of  〉  6 m in the seismic record has been identified by previous studies and radiocarbon dated to around 700 Common Era. Here, we combine (i) comprehensive sedimentological investigation of sediment cores recovered from the on- and offshore settings, (ii) mineralogical fingerprinting of the inflows from key catchments to characterize sediment provenance, and (iii) numerical tsunami modeling, to test the hypothesis of a tsunamigenic delta collapse in Lake Sils. We observe a clastic event deposit consisting of coarse-grained, fining-upward sand overlying an organic-rich peat deposit in the shallow water. This layer thins and fines landward on the coastal plain. Toward the deeper water (20–40 m), the deposit transforms into a thicker and more heterogeneous sediment package with multiple sequences of fining-upward sand and a well-pronounced clay cap at the top. Radiocarbon dating of the peat underlying the event deposit yields a maximum age of 225–419 calibrated  Common Era. The tsunami models, which indicate wave heights reaching up to 5 m, simulate areas of inundation that coincide with the location of event deposits. Based on our results, we propose that the historically undocumented Isola Delta collapse generated a basin-wide tsunami that inundated the lakeshore, transporting large amounts of unconsolidated sediment along the lakeshore toward the coastal plain and into the deeper lake basin.
    Type of Medium: Online Resource
    ISSN: 0921-030X , 1573-0840
    URL: Article
    DOI: 10.1007/s11069-021-04533-y
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2021
    detail.hit.zdb_id: 2017806-2
    SSG: 14
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  • 5
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    Continental weathering as the source of iron in Jurassic iron oolites from Switzerland
    Springer Science and Business Media LLC ; 2023
    In:  Swiss Journal of Geosciences Vol. 116, No. 1 ( 2023-12)
    Details
    In: Swiss Journal of Geosciences, Springer Science and Business Media LLC, Vol. 116, No. 1 ( 2023-12)
    Abstract: Iron is extremely insoluble in oxic seawater. The lack of a large aqueous reservoir means that sediments rich in authigenic iron are rare in the modern ocean. In the Middle Jurassic, however, condensed iron-rich sedimentary rocks are widely distributed. Their formation coincides with increased volcanic activity and continental weathering related to the breakup of Pangea, suggesting iron supply through one of these processes. We studied three Swiss shallow-marine iron oolites from Herznach, Windgällen and Erzegg, all from condensed sedimentary sequences of Middle to early Late Jurassic age, to constrain the source of iron to these rocks, combining radiogenic neodymium, strontium and stable iron isotope analyses. Leached authigenic neodymium isotope compositions, which appear to preserve the primary signature, serve as a tracer for the potential involvement of hydrothermal fluids in the formation of the iron oolites. The three iron oolite successions yield crustal Nd isotope compositions (εNd between − 9 and − 7), providing no evidence for the involvement of such fluids. It is, thus, more likely that iron in the sediments derived from detrital fluvial inputs. Strontium isotope compositions, which could potentially support these findings, point to metamorphic overprinting associated with Alpine thrusting. The light iron isotope signatures associated with Middle to early Late Jurassic condensed sequences, δ 56 Fe between − 1.49 and − 0.57‰, suggest that microbially-mediated iron reduction was also involved in generating these sediments.
    Type of Medium: Online Resource
    ISSN: 1661-8726 , 1661-8734
    URL: Article
    DOI: 10.1186/s00015-023-00431-6
    RVK:
    TE 1000
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 2379946-8
    SSG: 13
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  • 6
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    Reconstructing the magnitude of Early Toarcian (Jurassic) warming using the reordered clumped isotope compositions of belemnites
    Elsevier BV ; 2021
    In:  Geochimica et Cosmochimica Acta Vol. 293 ( 2021-01), p. 308-327
    Details
    In: Geochimica et Cosmochimica Acta, Elsevier BV, Vol. 293 ( 2021-01), p. 308-327
    Type of Medium: Online Resource
    ISSN: 0016-7037
    URL: Article
    DOI: 10.1016/j.gca.2020.10.005
    RVK:
    TE 1000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 300305-X
    detail.hit.zdb_id: 1483679-8
    SSG: 13
    SSG: 16,12
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  • 7
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    Geochemical fingerprinting of key lithologies and depositional processes across the upper boundary of the Opalinus Clay (Aalenian, Middle Jurassic, northern Switzerland)
    Wiley ; 2021
    In:  The Depositional Record Vol. 7, No. 1 ( 2021-02), p. 25-51
    Details
    In: The Depositional Record, Wiley, Vol. 7, No. 1 ( 2021-02), p. 25-51
    Abstract: The Opalinus Clay is an argillaceous to silty mudstone formation, notable in Switzerland as the selected host rock for deep geological disposal of radioactive waste. Its upper bounding unit (Passwang Formation and eastern equivalents) is composed of successions of mudstone, sandy bioclastic marl and limestone separated by ooidal ironstone beds. The lithostratigraphic transition is diachronous across northern Switzerland and shows high vertical and lateral lithological variability. To constrain this variability into predictive models, and to identify horizons with properties that could potentially influence radionuclide mobility, the sedimentological and diagenetic processes involved in the genesis of this transition have to be investigated. The present study aims at testing the applicability of X‐ray fluorescence chemostratigraphy to characterise the mixed carbonate–siliciclastic units and understand the complex genesis of the lithostratigraphic transition from the Opalinus Clay towards its upper bounding unit. Sediment drill cores from four locations across northern Switzerland (Mont Terri, Riniken, Weiach and Benken) are analysed using high‐resolution X‐ray fluorescence core scanning. Data are compared to petrographic and additional geochemical data sets (inductively coupled plasma mass spectrometry, scanning electron microscopy with energy dispersive X‐ray analysis, micro‐X‐ray fluorescence mapping) obtained from powdered samples, thin section analyses and drill core slabs. The results demonstrate that the combination of these rapid and non‐destructive measurements along with multivariate data analysis allows the fast and objective classification of lithofacies along complex sedimentary successions. Moreover, it provides quantitative means for differentiating between prominent depositional and post‐depositional processes. The lithostratigraphic transition has been traced by the use of specific elemental proxies as a discontinuity, and its genesis linked to sediment bypassing.
    Type of Medium: Online Resource
    ISSN: 2055-4877 , 2055-4877
    URL: Issue
    URL: Article
    DOI: 10.1002/dep2.v7.1
    DOI: 10.1002/dep2.126
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2816049-6
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  • 8
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    Carbon isotope stratigraphy, biostratigraphy and sedimentology of the Upper Jurassic – Lower Cretaceous Rayda Formation, Central Oman Mountains
    Schweizerbart ; 2017
    In:  Newsletters on Stratigraphy Vol. 50, No. 1 ( 2017-01-01), p. 91-109
    Details
    In: Newsletters on Stratigraphy, Schweizerbart, Vol. 50, No. 1 ( 2017-01-01), p. 91-109
    Type of Medium: Online Resource
    ISSN: 0078-0421
    Uniform Title: Carbon isotope stratigraphy, biostratigraphy and sedimentology of the Upper Jurassic – Lower Cretaceous Rayda Formation, Central Oman Mountains
    URL: Article
    DOI: 10.1127/nos/2016/0309
    Language: English , English
    Publisher: Schweizerbart
    Publication Date: 2017
    detail.hit.zdb_id: 129382-5
    detail.hit.zdb_id: 2158078-9
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  • 9
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    Disentangling shallow‐water bulk carbonate carbon isotope archives with evidence for multi‐stage diagenesis: An in‐depth component‐specific petrographic and geochemical study from Oman (mid‐Cretaceous)
    Wiley ; 2017
    In:  The Depositional Record Vol. 3, No. 2 ( 2017-12), p. 233-257
    Details
    In: The Depositional Record, Wiley, Vol. 3, No. 2 ( 2017-12), p. 233-257
    Abstract: Disentangling shallow‐water bulk carbonate carbon isotope archives into primary and diagenetic components is a notoriously difficult task and even diagenetically screened records often provide chemostratigraphic patterns that significantly differ from global signals. This is mainly caused by the polygenetic nature of shallow‐water carbonate substrates, local carbon cycle processes causing considerable neritic–pelagic isotope gradients and the presence of hiatal surfaces resulting in extremely low carbonate preservation rates. Provided here is an in‐depth petrographic and geochemical evaluation of different carbonate phases of a mid‐Cretaceous (Barremian–Aptian) shallow‐water limestone succession (Jabal Madar section) deposited on the tropical Arabian carbonate platform in Oman. The superposition of stable isotope signatures of identified carbonate phases causes a complex and often noisy bulk carbon isotope pattern. Blocky sparite cements filling intergranular pores and bioclastic voids evidence intermediate to (arguably) deep burial diagenetic conditions during their formation, owing to different timing or differential faulting promoting the circulation of fluids from variable sources. In contrast, sparite cements filling sub‐vertical veins reveal a rock‐buffered diagenetic fluid composition with an intriguing moderate enrichment in 13 C, probably due to fractionation during pressure release in the context of the Miocene exhumation of the carbonate platform under study. The presence of abundant, replacive dedolomite in mud‐supported limestone samples forced negative carbon and oxygen isotope changes that are either associated with the thermal breakdown of organic matter in the deep burial realm or the expulsion of buried meteoric water in the intermediate burial realm. Notwithstanding the documented stratigraphically variable and often facies‐related impact of different diagenetic fluids on the bulk‐rock stable isotope signature, the identification of diagenetic end‐members defined δ 13 C and δ 18 O threshold values that allowed the most reliable ‘primary’ bulk carbon isotope signatures to be extracted. Most importantly, this approach exemplifies how to place regional shallow‐water stable isotope patterns with evidence for a complex multi‐stage diagenetic history into a supraregional or even global context.
    Type of Medium: Online Resource
    ISSN: 2055-4877 , 2055-4877
    URL: Article
    DOI: 10.1002/dep2.35
    Language: English
    Publisher: Wiley
    Publication Date: 2017
    detail.hit.zdb_id: 2816049-6
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  • 10
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    Late Jurassic to Cretaceous evolution of the eastern Tethyan Hawasina Basin (Oman Mountains)
    Wiley ; 2017
    In:  Sedimentology Vol. 64, No. 1 ( 2017-01), p. 87-110
    Details
    In: Sedimentology, Wiley, Vol. 64, No. 1 ( 2017-01), p. 87-110
    Abstract: Remnants of a Mesozoic continental margin can be studied today in the nappe pile of the Oman Mountains. Successions of the Arabian carbonate platform and the adjacent deep Hawasina Basin are preserved in the nappe pile and in the foothills of this Mountain range. The Jurassic–Cretaceous sediment successions of the Hawasina Basin (Sumeini and Hamrat Duru Group) are focus of this study. These basinal archives contain information on the response of an eastern Tethyan equatorial ocean system to multiple perturbations of the carbon cycle and of climate during the Cretaceous. Turbiditic continental slope and basinal successions formed near the Calcite Compensation Depth are difficult to date with biostratigraphy and sequence stratigraphy. The available stratigraphic framework for the Hawasina successions was not sufficient for tracing palaeoceanography through the time window of interest in this study. Therefore, existing sequence stratigraphy and biostratigraphy are complemented by additional biostratigraphic data and with a newly established carbon and strontium isotope chemostratigraphy. The Hawasina Basin was affected by sea‐level variations, by changes in oceanography and also by regional tectonics. A first major modification of oceanography occurred at the end of the Jurassic when pelagic Maiolica‐type sediments were accumulated in the deep basin and on adjacent submarine highs (Lower Member of Huwar and Sid'r formations). Pelagic to hemipelagic conditions existed until the Valanginian, marked by a major carbon isotope excursion. Pelagic sediments were replaced afterwards by a succession of fine to coarse‐grained turbidites of Hauterivian to Aptian age. The transition into the mid‐Cretaceous is marked by a sudden shift to fine‐grained siliceous or chert deposits, at a time when sediments enriched in organic carbon were accumulated in the western Tethys and Atlantic Oceans. The continental slope as well as the Hawasina Basin seemed to have been well‐ventilated during Early and mid‐Cretaceous time. Siliceous limestones and chert are indicators of well‐mixed and nutrient‐rich surface water, while the absence of black shales suggests young and oxygenated deep water with a possible source on the vast Arabian platform. These peculiar oceanographic conditions were most pronounced during the onset of the extreme greenhouse episodes of the Oceanic Anoxic Event 1a.
    Type of Medium: Online Resource
    ISSN: 0037-0746 , 1365-3091
    URL: Issue
    URL: Article
    DOI: 10.1111/sed.2017.64.issue-1
    DOI: 10.1111/sed.12326
    RVK:
    RB 10121
    Language: English
    Publisher: Wiley
    Publication Date: 2017
    detail.hit.zdb_id: 2020955-1
    detail.hit.zdb_id: 206889-8
    SSG: 13
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