Basin-scale architecture of deeply emplaced sill complexes: Jameson Land, East Greenland

Christian Haug Eide, Nick Schofield, Dougal A Jerram, John A. Howell

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Igneous sills are common components in rifted sedimentary basins globally. Much work has focussed on intrusions emplaced at relatively shallow paleodepths (0-1.5 km). However, due to constraints of reflection-seismic imaging and limited field-exposures, intrusions emplaced at deeper paleodepths (>1.5 km) within sedimentary basins are as not well-understood in regard to their emplacement-mechanisms and host-rock interactions. Results from a worldclass, seismic-scale outcrop of intruded Jurassic sedimentary rocks in East Greenland are presented here. Igneous intrusions and their host-rocks have been studied in the field and utilising a 22 km long “virtual outcrop” acquired using helicopter-mounted lidar. The results suggest the geometries of the deeply emplaced sills (c. 3 km) are dominantly controlled by host-rock lithology, sedimentology and cementation state. Sills favour mudstones and even exploit cm-scale mudstone-draped dune-foresets in otherwise homogeneous sandstones. Sills in poorly cemented intervals show clear ductile structures, in contrast to sills incemented units which only show brittle emplacement-structures. The studied host-rock is remarkably un-deformed despite intrusion. Volumetric expansion caused by the intrusions is almost exclusively accommodated by vertical jack-up of the overburden, on a 1:1 ratio, implying that intrusions may play a significant role in uplift of a basin if emplaced at deep basinal levels.
Original languageEnglish
Pages (from-to)23-40
Number of pages18
JournalJournal of the Geological Society
Issue number1
Early online date22 Jul 2016
Publication statusPublished - Jan 2017

Bibliographical note

We would like to thank reviewers Steffi Burchadt and Simon Passey for the considerate and careful reviews which improved this paper. Funding for data collection in study was provided from the research council of Norway through the PETROMAKS project 193059 and the Force Safari project. Funding for data analysis was provided from PETROMAKS through the Trias North project (234152). Dougal Jerram is partly supported by research council of Norway Centres of Excellence funding (223272, CEED). The data were acquired by Julien Vallet and Samuel Pitiot of Helimap Systems. Simon Buckley is acknowledged for help with data processing, and Gijs Henstra and Björn Nyberg for assistance in the field. Aka Lynge and Arild Andresen are thanked for logistical support.


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