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Quantifying the influence of sill intrusion on the thermal evolution of organic-rich sedimentary rocks in non-volcanic passive margins : an example from ODP 210-1276, offshore Newfoundland, Canada.

Peace, A. and McCaffrey, K. and Imber, J. and Hobbs, R. and van Hunen, J. and Gerdes, K. (2015) 'Quantifying the influence of sill intrusion on the thermal evolution of organic-rich sedimentary rocks in non-volcanic passive margins : an example from ODP 210-1276, offshore Newfoundland, Canada.', Basin research., 29 (3). pp. 249-265.

Abstract

Intrusive magmatism is an integral and understudied component in both volcanic and non-volcanic passive margins. Here, we investigate the thermal effects of widespread (c. 20,000 km2) intrusive magmatism on the thermal evolution of organic-rich sedimentary rocks on the non-volcanic Newfoundland passive margin. ODP 210-1276 (45.41°N, 44.79°W) intersects two sills: an older, upper sill and a younger, lower sill that are believed to correspond to the high amplitude “U-reflector” observed across the Newfoundland Basin. A compilation of previous work collectively provides; 1) emplacement depth constraints, 2) vitrinite reflectance data and 3) 40Ar/39Ar dates. Collectively, these datasets provide a unique opportunity to model the conductive cooling of the sills and how they affect thermal maturity of the sedimentary sequence. A finite differences method was used to model the cooling of the sills, with the model outputs then being entered into the EASY%Ro vitrinite reflectance model. The modelled maturation profile for ODP 210-1276 shows a significant but localised effect on sediment maturity as a result of the intrusions. Our results suggest that even on non-volcanic margins, intrusive magmatism can significantly influence the thermal evolution in the vicinity of igneous intrusions. In addition, the presence of widespread sills on non-volcanic passive margins such as offshore Newfoundland may be indicative of regional-scale thermal perturbations that should be considered in source rock maturation studies.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1111/bre.12131
Publisher statement:This is the accepted version of the following article: Peace, A., McCaffrey, K., Imber, J., Hobbs, R., van Hunen, J. and Gerdes, K. (2015), Quantifying the influence of sill intrusion on the thermal evolution of organic-rich sedimentary rocks in nonvolcanic passive margins: an example from ODP 210-1276, offshore Newfoundland, Canada. Basin Research, 29(3): 249-265, which has been published in final form at https://doi.org/10.1111/bre.12131. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Record Created:05 May 2015 12:20
Last Modified:14 Sep 2017 09:36

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