Litho- and biostratigraphy of the Opalinus Clay and bounding formations in the Mont Terri rock laboratory (Switzerland).
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| Title: | Litho- and biostratigraphy of the Opalinus Clay and bounding formations in the Mont Terri rock laboratory (Switzerland). |
|---|---|
| Authors: | Hostettler, Bernhard1, Reisdorf, Achim, Jaeggi, David2, Deplazes, Gaudenz3, Bläsi, Hansruedi4, Morard, Alain2, Feist-Burkhardt, Susanne, Waltschew, Anton5, Dietze, Volker6, Menkveld-Gfeller, Ursula1 menkveld@nmbe.ch |
| Source: | Swiss Journal of Geosciences. Apr2017, Vol. 110 Issue 1, p23-37. 15p. |
| Subjects: | Biostratigraphy, Fossil microorganisms, Ammonoidea, Rocks |
| Geographic Terms: | Switzerland |
| Abstract: | A 250 m-deep inclined well, the Mont Terri BDB-1, was drilled through the Jurassic Opalinus Clay and its bounding formations at the Mont Terri rock laboratory (NW Switzerland). For the first time, a continuous section from (oldest to youngest) the topmost members of the Staffelegg Formation to the basal layers of the Hauptrogenstein Formation is now available in the Mont Terri area. We extensively studied the drillcore for lithostratigraphy and biostratigraphy, drawing upon three sections from the Mont Terri area. The macropaleontological, micropaleontological, and palynostratigraphical data are complementary, not only spatially but they also cover almost all biozones from the Late Toarcian to the Early Bajocian. We ran a suite of geophysical logs to determine formational and intraformational boundaries based on clay content in the BDB-1 well. In the framework of an interdisciplinary study, analysis of the above-mentioned formations permitted us to process and derive new and substantial data for the Mont Terri area in a straightforward way. Some parts of the lithologic inventory, stratigraphic architecture, thickness variations, and biostratigraphic classification of the studied formations deviate considerably from occurrences in northern Switzerland that crop out further to the east. For instance, with the exception of the Sissach Member, no further lithostratigraphic subdivision in members is proposed for the Passwang Formation. Also noteworthy is that the ca. 130 m-thick Opalinus Clay in the BDB-1 core is 20 m thinner than that equivalent section found in the Mont Terri tunnel. The lowermost 38 m of the Opalinus Clay can be attributed chronostratigraphically solely to the Aalensis Zone (Late Toarcian). Deposition of the Opalinus Clay began at the same time farther east in northern Switzerland (Aalensis Subzone, Aalensis Zone), but in the Mont Terri area the sedimentation rate was two or three orders of magnitude higher. [ABSTRACT FROM AUTHOR] |
| Copyright of Swiss Journal of Geosciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 122382603 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s00015-016-0250-3 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 23 Subjects: – SubjectFull: Biostratigraphy Type: general – SubjectFull: Fossil microorganisms Type: general – SubjectFull: Ammonoidea Type: general – SubjectFull: Rocks Type: general – SubjectFull: Switzerland Type: general Titles: – TitleFull: Litho- and biostratigraphy of the Opalinus Clay and bounding formations in the Mont Terri rock laboratory (Switzerland). Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Hostettler, Bernhard – PersonEntity: Name: NameFull: Reisdorf, Achim – PersonEntity: Name: NameFull: Jaeggi, David – PersonEntity: Name: NameFull: Deplazes, Gaudenz – PersonEntity: Name: NameFull: Bläsi, Hansruedi – PersonEntity: Name: NameFull: Morard, Alain – PersonEntity: Name: NameFull: Feist-Burkhardt, Susanne – PersonEntity: Name: NameFull: Waltschew, Anton – PersonEntity: Name: NameFull: Dietze, Volker – PersonEntity: Name: NameFull: Menkveld-Gfeller, Ursula IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: Apr2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 16618726 Numbering: – Type: volume Value: 110 – Type: issue Value: 1 Titles: – TitleFull: Swiss Journal of Geosciences Type: main |
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