Portrait of a giant deep-seated magmatic conduit system:The Seiland Igneous Province

• Published in: Lithos
• Main Authors: Larsen, Rune B., Grant, Thomas, Sorensen, Bjorn E., Tegner, Christian, McEnroe, Suzanne, Pastore, Zeudia, Fichler, Christine, Nikolaisen, Even, Grannes, Kim R., Church, Nathan, ter Maat, Geertje W., Michels, Alexander
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2018
• Subjects: Central Iapetus Magmatic Province; Plume magmatism; Mantle volatiles; AFC-processes; KALAK-NAPPE-COMPLEX; NORTHERN NORWAY; SCANDINAVIAN CALEDONIDES; FLOOD BASALTS; NORWEGIAN CALEDONIDES; ULTRAMAFIC COMPLEX; LAYERED INTRUSION; CRUSTAL STRUCTURE; CHILAS COMPLEX; NW PAKISTAN; Greenland; Kalak; Norway; Seiland; Northern Norway
• Online Access: https://pure.au.dk/portal/da/publications/portrait-of-a-giant-deepseated-magmatic-conduit-system(211ed3b3-7f20-43f1-81f6-c5e0851e038a).html; https://doi.org/10.1016/j.lithos.2017.11.013

The Seiland Igneous Province (SIP), Northern Norway, contains >5000 km(2) of mafic and ultramafic intrusions with minor alkaline, carbonatite and felsic rocks that were intruded into the lower continental crust at a depth of 25 to as much as 35 km. The SIP can be geochemically and temporally correlated to numerous dyke swarms throughout Scandinavia at 560-610 Ma, and is linked to magmatic provinces in W-Greenland and NE-America that are collectively known as the Central Iapetus Magmatic Province (CIMP). Revised mapping show that the SIP exposes 85-90% layered tholeiitic- alkaline- and syeno-gabbros, 8-10% peridotitic complexes, 2-5% carbonatite, syenite and diorite that formed within a narrow ( Essentially, the ultramafic complexes in the SIP comprises deep-seated transient magma chambers that facilitated mixing and homogenisation of a rich diversity of fertile asthenospheric melts en route to the upper parts of the continental crust. (C) 2017 Elsevier B.V. All rights reserved.