Ordovician and Silurian Magmatism in the Upper Nappe, Uppermost Allochthon, Helgeland Nappe Complex, North-Central Norway
dc.contributor.author | Barnes, Calvin G. | |
dc.contributor.author | Reid, Kristin | |
dc.contributor.author | Frost, Carol D. | |
dc.contributor.author | Barnes, Melanie | |
dc.contributor.author | Allen, Charlotte M | |
dc.contributor.author | Yoshinobu, Aaron S | |
dc.date.accessioned | 2015-12-08T22:22:31Z | |
dc.date.issued | 2011 | |
dc.date.updated | 2016-02-24T11:40:36Z | |
dc.description.abstract | The structurally lowest parts of the Upper Nappe of the Helgeland Nappe Complex consist primarily of migmatitic quartzofeldspathic gneiss with intercalated calc-silicate gneiss. Detrital zircons in the gneiss indicate an Ordovician depositional age. Migmatization via biotite dehydration reactions occurred at ~480 Ma at pressures of ~700 MPa; some migmatites were mobilized into cross-cutting diatexites. Diverse gabbroic to granitic plutons and dikes of the Bindal Batholith were emplaced from 448-424 Ma. They range from calc-alkaline to alkalic and most have initial 87Sr/86Sr <0.707 and εNd from 0 to -4. Pressures of emplacement were ca. 300 MPa. Shear zones with reverse shear sense cut 437 Ma intrusions, suggesting that contraction accompanied magmatism. | |
dc.identifier.issn | 0029-196X | |
dc.identifier.uri | http://hdl.handle.net/1885/32597 | |
dc.publisher | Geological Society Norway | |
dc.source | Norsk Geologisk Tidskrift - Norwegian Journal of Geology | |
dc.subject | Keywords: allochthon; batholith; dehydration; depositional sequence; emplacement; gneiss; magmatism; migmatization; nappe; Ordovician; shear zone; Silurian; zircon; Helgeland; Nordland; Norway | |
dc.title | Ordovician and Silurian Magmatism in the Upper Nappe, Uppermost Allochthon, Helgeland Nappe Complex, North-Central Norway | |
dc.type | Journal article | |
local.bibliographicCitation.issue | 3 | |
local.bibliographicCitation.lastpage | 136 | |
local.bibliographicCitation.startpage | 121 | |
local.contributor.affiliation | Barnes, Calvin G., Texas Tech University | |
local.contributor.affiliation | Reid, Kristin, Texas Tech University | |
local.contributor.affiliation | Frost, Carol D., University of Wyoming | |
local.contributor.affiliation | Barnes, Melanie, Texas Tech University | |
local.contributor.affiliation | Allen, Charlotte M, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Yoshinobu, Aaron S, Texas Tech University | |
local.contributor.authoremail | repository.admin@anu.edu.au | |
local.contributor.authoruid | Allen, Charlotte M, u9108301 | |
local.description.embargo | 2037-12-31 | |
local.description.notes | Imported from ARIES | |
local.identifier.absfor | 040204 - Organic Geochemistry | |
local.identifier.absseo | 970104 - Expanding Knowledge in the Earth Sciences | |
local.identifier.ariespublication | U8501506xPUB93 | |
local.identifier.citationvolume | 91 | |
local.identifier.scopusID | 2-s2.0-84857186123 | |
local.identifier.uidSubmittedBy | U8501506 | |
local.type.status | Published Version |
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