ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Publication Date: 2021-03-29
    Description: Basement-cover-interfaces are important crustal boundaries. In many cases they act as detachment horizons. Criteria like pre-erosional basement characteristics, intensity of palaeoweathering and post-erosional processes during burial stage lead to a huge variety of observable alteration and fabric features of basement-cover-interfaces, which may influence the shear-strength. Unconformity-parallel planar fabrics in the weathering profile were facilitated by palaeo-alteration and later processes (Angerer 2005 unpubl. data). Such fabrics may be a factor for lowering the shear-strength (e.g. Wintsch et al. 1995). The probably ubiquitous existence of those fabrics at basement-coverinterfaces is investigated in case studies by means of AMS-fabric analysis, which is a sensitive indicator of rock fabric changes. The present case study is based on sections from two drill cores across the erosional unconformity between Fennoscandian Granite (Revsund) and Cambrian Gärdsjön Fm. (Långviken SGU 73007 and Hara 79002) (petrographic descriptions in Gee, 1978 and Gee et al. 1982).
    Description: conference
    Keywords: 551 ; VAH 000 ; VAE 813 ; TOT 310 ; VED 200 ; Verwitterung {Geologie} ; Kaledonische Orogene {Geologie} ; Gesteinsmagnetismus {Geophysik} ; Schweden {Geologie} ; Mittelschweden ; Kaledoniden ; Verwitterungshorizont ; Magnetische Anisotropie ; Gesteinsgefüge ; Magnetische Suszeptibiblität
    Language: German
    Type: anthologyArticle , publishedVersion
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Publication Date: 2021-03-29
    Description: Electromagnetic radiation (EMR) as measured at the surface of the lithosphere or underground shows preferred orientations, which can be related to microcracks and other brittle structures at micro and nano scales (see Bahat et al. 2005 and references therein). During the last years, numerous studies showed the applicability of EMR measurements for the determination of active fractures and stress orientations. EMR is determined with a ‘Cerescope’, which picks up EMR signals at frequencies from 5– 50 kHz (Obermeyer, 2005) with a ferrite aerial and processes them electronically so that the results can be displayed on a screen or copied to a computer. With the help of oriented EMR measurements, intensity variations are determined, which can be related to preferred crack fracture orientations. From this information, orientations of the principal stresses can be calculated. In addition, the intensity of the EMR is related to stress magnitudes...
    Description: conference
    Keywords: 551 ; TQD 000 ; VAE 120 ; VAE 150 ; VAE 140 ; Elektrische Verfahren {Geophysik} ; Methodik {Strukturgeologie} ; Strukturelle Erscheinungen {Strukturgeologie} ; Gesteinsdeformation {Strukturgeologie} ; Lithosphäre ; Fraktographie ; Spannungstensor ; Elektromagnetisches Verfahren
    Language: German
    Type: anthologyArticle , publishedVersion
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...