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The Slaufrudar pluton, southeast Iceland: An example of shallow magma emplacement by coupled cauldron subsidence and magmatic stoping
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology. Univ Gottingen, Geosci Ctr, D-37077 Gottingen, Germany.
Univ Gottingen, Geosci Ctr, D-37077 Gottingen, Germany.
Univ Gottingen, Geosci Ctr, D-37077 Gottingen, Germany; Leibniz Inst Appl Geophys, D-30655 Hannover, Germany.
2011 (English)In: Geological Society of America Bulletin, ISSN 0016-7606, E-ISSN 1943-2674, Vol. 124, no 1-2, 213-227 p.Article in journal (Refereed) Published
Abstract [en]

The Tertiary Slaufrudalur pluton is the largest granitic intrusion exposed in Iceland. Five glacial valleys cut through the uppermost 900 m of the pluton, exposing spectacular sections through its roof, walls, and interior. The wall contacts are subvertical and sharp. Only in the northeast and southwest is the wall contact characterized by brittle faulting. The pluton roof is smooth at map scale, so that the overall cross-sectional shape of the pluton and its internal layering indicate emplacement by incremental floor sinking through cauldron subsidence. A pronounced elongation of the pluton, parallel to the trend of regional fissure swarms, and its angular shape in map view indicate strong tectonic control on horizontal ring-fault propagation, whereas faulted wall contacts represent step-over structures between the earlier-formed ring faults. On outcrop scale, the roof contact exhibits numerous steps, faults, and apophyses associated with conjugate fracture sets that are parallel and perpendicular to the strike of the length of the pluton. These structures were presumably formed by sequential inflation and deflation of the pluton during episodic magma intrusion and therefore are closely coupled to cauldron subsidence. As a result of roof fracturing and magma injection along the fractures, roof material is found partly or completely detached within the granite. The Slaufrudalur pluton therefore provides new insight into the coupling of the emplacement mechanisms of cauldron subsidence and magmatic stoping in the upper crust.

Place, publisher, year, edition, pages
2011. Vol. 124, no 1-2, 213-227 p.
National Category
Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
URN: urn:nbn:se:uu:diva-159341DOI: 10.1130/B30430.1ISI: 000298722100014OAI: oai:DiVA.org:uu-159341DiVA: diva2:444369
Available from: 2011-09-28 Created: 2011-09-28 Last updated: 2017-12-08Bibliographically approved

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Burchardt, SteffiKrumbholz, Michael

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