Crustal conductivity in Fennoscandia—a compilation of a database on crustal conductance in the Fennoscandian Shield

• Korja Toivo

  Academy of Finland/University of Oulu/Geological Survey of Finland

• Engels Martin

  Uppsala University, Department of Earth Sciences, Geophysics

• Zhamaletdinov Abdoulkhay A.

  Russian Academy of Sciences, Kola Science Centre, Geological Institute

• Kovtun Aida A.

  Institute of Physics, St. Petersburg University

• Palshin Nikolai A.

  Russian Academy of Sciences, Shirsov Institute of Oceanology

• Smirnov Maxim Yu.

  Institute of Physics, St. Petersburg University

• Tokarev Alexander D.

  Russian Academy of Sciences, Kola Science Centre, Geological Institute

• Asming Vladimir E.

  Russian Academy of Sciences, Kola Science Centre, Geological Institute

• Vanyan Leonid L.

  Russian Academy of Sciences, Shirsov Institute of Oceanology

• Vardaniants Isabella L.

  Institute of Physics, St. Petersburg University

• the BEAR Working Group

書誌事項

タイトル別名

• Crustal conductivity in Fennoscandia-a compilation of a database on crustal conductance in the Fennoscandian Shield

抄録

A priori knowledge on large-scale sub-surface conductivity structure is required in many applications investigating electrical properties of the lithosphere. A map on crustal conductivity for the Fennoscandian Shield and its surrounding oceans, sea basins and continental areas is presented. The map is based on a new database on crustal conductance, i.e. depth integrated conductivity, where all available information on the conductivity of the bedrock, sedimentary cover and seawater are compiled together for the first time for the Fennoscandian Shield. The final model consists of eight separate layers to allow a 3D description of conductivity structures. The first three layers, viz. water, sediments and the first bedrock layer, describe the combined conductance of the uppermost 10 km. The other five bedrock layers contain the data of the crustal conductance from the depth of 10 km to the depth of 60 km. The database covers an area from 0°E to 50°E and 50°N to 85°N. Water conductances are estimated from bathymetric data by converting depths to conductances and taking into account the salinity variations in the Baltic Sea. Conductance of the sedimentary cover includes estimates on the conductance of both marine and continental sediments. Bedrock conductances are extrapolated from 1D- and 2D-models. Extrapolations are based on data from magnetometer array studies, airborne electromagnetic surveys and other electromagnetic investigations as well as on other geophysical and geological data. The crustal conductivity structure appears to be very heterogeneous. Upper crust, in particular, has a very complex structure reflecting a complex geological history. Lower crust seems to be slightly more homogeneous although large regional contrasts are found in both the Archaean and Palaeoproterozoic areas.

収録刊行物

• Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ

  Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ 54 (5), 535-558, 2002

  地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会

キーワード

• Space and Planetary Science
• Geology

詳細情報

• CRID: 1390282681490088576
• NII論文ID: 10008600320
• NII論文ID: 130003780906
• NII書誌ID: AA11211921
• DOI: 10.1186/bf03353044
• ISSN: 18805981
• ISSN: 13438832
• NDL書誌ID: 6166244
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6166244
• Web Site: https://link.springer.com/content/pdf/10.1186/BF03353044.pdf
• Web Site: https://link.springer.com/article/10.1186/BF03353044/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1186/BF03353044
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可