On a type classification of lower crustal layers under Precambrian regions
Item
Title (Dublin Core)
en-US
On a type classification of lower crustal layers under Precambrian regions
Description (Dublin Core)
en-US
Various parameters pertinent to the lower crustal layer under Precambrian regions are listed for locations where seismic, and geomagnetic or geoelectric, studies have been undertaken. The parameters define three distinct types of lower crustal layer with certain dominant characteristics: Type I – "Normal" – typical continental seismic parameters and a high electrical resistivity (103–104 Ωm); Type II – "Intermediate" – high compressional wave velocity (either fixed Vp = 7.0 km s-1 or transitional Vp = 6.7 → 7.3 km s-1) and a moderate resistivity (100–300 Ωm); Type III – "Low" – a low shear wave velocity layer (LVsL), high Poisson's ratio (> 0.30) and low electrical resistivity (10–50 Ωm). Possible conditions and rock types, existing at the P–T environment of the lower crust and which could account for the observations, are suggested. The zoning of Canada into types implies that Type II layers are shield "edge" effects, and that inability to observe what is regarded as the final stage of development of a shield region under certain shields may be due to their being too small.
ARK: https://n2t.net/ark:/88439/y052001
Permalink: https://geophysicsjournal.com/article/185
ARK: https://n2t.net/ark:/88439/y052001
Permalink: https://geophysicsjournal.com/article/185
Creator (Dublin Core)
Jones, A.G.
Subject (Dublin Core)
en-US
Precambrian regions
en-US
Crustal structure
en-US
Electromagnetic induction studies
en-US
Seismic studies
en-US
Solid Earth
Publisher (Dublin Core)
en-US
Journal of Geophysics
Date (Dublin Core)
1981-01-22
Type (Dublin Core)
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
en-US
Peer-reviewed Article
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
https://journal.geophysicsjournal.com/JofG/article/view/185
Source (Dublin Core)
en-US
Journal of Geophysics; Vol 49 No 1 (1981): Journal of Geophysics; 226-233
2643-2986
2643-9271
Language (Dublin Core)
eng
Relation (Dublin Core)
https://journal.geophysicsjournal.com/JofG/article/view/185/145