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Seismic image of the basal portion of the Bjerkreim-Sokndal layered intrusion

1997; Geological Society of America; Volume: 25; Issue: 12 Linguagem: Inglês

10.1130/0091-7613(1997)025 2.3.co;2

1943-2682

Sharon Deemer, Charles A. Hurich,

Geophysics and Gravity Measurements

Research Article| December 01, 1997 Seismic image of the basal portion of the Bjerkreim-Sokndal layered intrusion Sharon Deemer; Sharon Deemer 1Department of Earth Sciences, Memorial University, St. John's, Newfoundland A1B 3X5, Canada Search for other works by this author on: GSW Google Scholar Charles Hurich Charles Hurich 1Department of Earth Sciences, Memorial University, St. John's, Newfoundland A1B 3X5, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Sharon Deemer 1Department of Earth Sciences, Memorial University, St. John's, Newfoundland A1B 3X5, Canada Charles Hurich 1Department of Earth Sciences, Memorial University, St. John's, Newfoundland A1B 3X5, Canada Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1997) 25 (12): 1107–1110. https://doi.org/10.1130/0091-7613(1997)025 2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Sharon Deemer, Charles Hurich; Seismic image of the basal portion of the Bjerkreim-Sokndal layered intrusion. Geology 1997;; 25 (12): 1107–1110. doi: https://doi.org/10.1130/0091-7613(1997)025 2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract A high-resolution seismic profile over the Layered Series of the Bjerkreim-Sokndal layered intrusion provides a high-quality seismic image of one of the rock types frequently cited as a source of dense lower crustal reflectivity. The data interpretation is controlled by a detailed comparison with exposed geology directly up-plunge and has implications for reaching a better understanding of deep crustal reflectivity. Reflections are produced by boundaries between major (≥100 m) lithologic units of moderately differing average composition, and small-scale modal layering (centimeters to several meters) contributes in a minor way. The seismic image provides a standard useful for identifying layered mafic intrusions within the upper and middle crust and for understanding their internal structure. The Bjerkreim data also imply that areas of highly reflective lower crust where underplating is believed to have occurred can result from internal lithologic layering resulting from fractionation and repeated influxes of magma to a closed system. The data show that highly developed modal layering can appear seismically transparent due to destructive interference. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.