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Emplacement of shocked basement clasts during crater excavation in the Ries impact structure.

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Title: Emplacement of shocked basement clasts during crater excavation in the Ries impact structure.
Authors: Dellefant, Fabian1 (AUTHOR) fabian.dellefant@lmu.de, Seybold, Lina1,2 (AUTHOR), Trepmann, Claudia A.1 (AUTHOR), Gilder, Stuart A.1 (AUTHOR), Sleptsova, Iuliia V.1 (AUTHOR), Hölzl, Stefan1,2 (AUTHOR), Kaliwoda, Melanie1,3 (AUTHOR)
Source: International Journal of Earth Sciences. Jun2024, Vol. 113 Issue 4, p951-971. 21p.
Subjects: Basements, Impact craters, Quartz, Deviatoric stress (Engineering), Breccia, Microscopy, Scanning electron microscopy
Abstract: In the Aumühle quarry of the Ries impact structure, moderately shocked clasts from the Variscan basement occur sandwiched between overlying suevite and components derived from the Mesozoic sedimentary cover of the underlying Bunte Breccia without distinct shock effects. We analyzed the clasts by optical microscopy, scanning electron microscopy (SEM/EDS/EBSD), and Raman spectroscopy to unravel their emplacement relation to the overlying suevite and the sediment-rock clasts of the Bunte Breccia. Clasts sizes range up to few decimeters and are embedded in a fine-grained lithic matrix; no impact-melt fragments are observed. Amphibolite clasts contain maskelynite with few lamellar remnants of feldspar, indicating shock pressures of 28–34 GPa. Amphiboles have cleavage fractures and ( 1 ¯ 01) mechanical twins suggesting differential stresses > 400 MPa. Felsic gneiss components have optically isotropic SiO2 indicative of shock pressures ≈35 GPa. Metagranite cataclasite clasts contain shocked calcite aggregates and quartz with a high density of fine rhombohedral planar deformation features indicating shock pressures ≈20 GPa. The moderately shocked basement clasts originate from deeper levels of the transient cavity and lower radial distance to the center of the structure compared to the sediment-rock clasts. Both were ballistically ejected during crater excavation. In accordance with palaeo- and rock magnetic data, they were mixed during turbulent deposition at the top of the Bunte Breccia before the emplacement of suevite. The high amount of basement clasts below suevite and on top of the underlying Bunte Breccia is consistent with the commonly reported inverse stratigraphy in the Ries impact structure. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Earth Sciences 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.)
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  Data: Emplacement of shocked basement clasts during crater excavation in the Ries impact structure.
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  Data: <searchLink fieldCode="AR" term="%22Dellefant%2C+Fabian%22">Dellefant, Fabian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> fabian.dellefant@lmu.de</i><br /><searchLink fieldCode="AR" term="%22Seybold%2C+Lina%22">Seybold, Lina</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Trepmann%2C+Claudia+A%2E%22">Trepmann, Claudia A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gilder%2C+Stuart+A%2E%22">Gilder, Stuart A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sleptsova%2C+Iuliia+V%2E%22">Sleptsova, Iuliia V.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hölzl%2C+Stefan%22">Hölzl, Stefan</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kaliwoda%2C+Melanie%22">Kaliwoda, Melanie</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Earth+Sciences%22">International Journal of Earth Sciences</searchLink>. Jun2024, Vol. 113 Issue 4, p951-971. 21p.
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  Data: <searchLink fieldCode="DE" term="%22Basements%22">Basements</searchLink><br /><searchLink fieldCode="DE" term="%22Impact+craters%22">Impact craters</searchLink><br /><searchLink fieldCode="DE" term="%22Quartz%22">Quartz</searchLink><br /><searchLink fieldCode="DE" term="%22Deviatoric+stress+%28Engineering%29%22">Deviatoric stress (Engineering)</searchLink><br /><searchLink fieldCode="DE" term="%22Breccia%22">Breccia</searchLink><br /><searchLink fieldCode="DE" term="%22Microscopy%22">Microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Scanning+electron+microscopy%22">Scanning electron microscopy</searchLink>
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  Data: In the Aumühle quarry of the Ries impact structure, moderately shocked clasts from the Variscan basement occur sandwiched between overlying suevite and components derived from the Mesozoic sedimentary cover of the underlying Bunte Breccia without distinct shock effects. We analyzed the clasts by optical microscopy, scanning electron microscopy (SEM/EDS/EBSD), and Raman spectroscopy to unravel their emplacement relation to the overlying suevite and the sediment-rock clasts of the Bunte Breccia. Clasts sizes range up to few decimeters and are embedded in a fine-grained lithic matrix; no impact-melt fragments are observed. Amphibolite clasts contain maskelynite with few lamellar remnants of feldspar, indicating shock pressures of 28–34 GPa. Amphiboles have cleavage fractures and ( 1 ¯ 01) mechanical twins suggesting differential stresses > 400 MPa. Felsic gneiss components have optically isotropic SiO2 indicative of shock pressures ≈35 GPa. Metagranite cataclasite clasts contain shocked calcite aggregates and quartz with a high density of fine rhombohedral planar deformation features indicating shock pressures ≈20 GPa. The moderately shocked basement clasts originate from deeper levels of the transient cavity and lower radial distance to the center of the structure compared to the sediment-rock clasts. Both were ballistically ejected during crater excavation. In accordance with palaeo- and rock magnetic data, they were mixed during turbulent deposition at the top of the Bunte Breccia before the emplacement of suevite. The high amount of basement clasts below suevite and on top of the underlying Bunte Breccia is consistent with the commonly reported inverse stratigraphy in the Ries impact structure. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of International Journal of Earth Sciences 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.</i> (Copyright applies to all Abstracts.)
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        Text: English
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        PageCount: 21
        StartPage: 951
    Subjects:
      – SubjectFull: Basements
        Type: general
      – SubjectFull: Impact craters
        Type: general
      – SubjectFull: Quartz
        Type: general
      – SubjectFull: Deviatoric stress (Engineering)
        Type: general
      – SubjectFull: Breccia
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      – SubjectFull: Microscopy
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      – SubjectFull: Scanning electron microscopy
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      – TitleFull: Emplacement of shocked basement clasts during crater excavation in the Ries impact structure.
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              M: 06
              Text: Jun2024
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              Y: 2024
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