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Natural fracture propping and earthquake-induced oil migration in fractured basement reservoirs (2019)
Journal Article
Holdsworth, R. E., McCaffrey, K. J. W., Dempsey, E., Roberts, N. M. W., Hardman, K., Morton, A., …Robertson, A. (2019). Natural fracture propping and earthquake-induced oil migration in fractured basement reservoirs. Geology, https://doi.org/10.1130/G46280.1

The geological processes that create fluid storage capacity and connectivity in global fractured basement reservoirs are poorly understood compared to conventional hydrocarbon plays. Hosting potentially multi-billion barrels of oil, the upfaulted P... Read More

The Neoarchaean Uyea Gneiss Complex, Shetland: an onshore fragment of the Rae Craton on the European Plate (2019)
Journal Article
Kinny, P., Strachan, R., Fowler, M., Clark, C., Davis, S., Jahn, I., …Dempsey, E. (2019). The Neoarchaean Uyea Gneiss Complex, Shetland: an onshore fragment of the Rae Craton on the European Plate. Journal of the Geological Society, https://doi.org/10.1144/jgs2019-017

A tract of amphibolite facies granitic gneisses and metagabbros in northern Shetland, U.K., is here named the Uyea Gneiss Complex. Zircon U–Pb dating indicates emplacement of the igneous protoliths of the complex c. 2746–2726 Ma, at a later time than... Read More

Coseismic ultramylonites: An investigation of nanoscale viscous flow and fault weakening during seismic slip (2019)
Journal Article
Pozzi, G., De Paola, N., Holdsworth, R. E., Bowen, L., Nielsen, S. B., & Dempsey, E. D. (2019). Coseismic ultramylonites: An investigation of nanoscale viscous flow and fault weakening during seismic slip. Earth and planetary science letters, 516, 164-175. https://doi.org/10.1016/j.epsl.2019.03.042

Faults weaken during the propagation of earthquakes due to the onset of thermally-activated mechanisms, which vary depending on the rock type. Recent experimental work suggests that carbonate-hosted faults are lubricated by viscous flow in nano-granu... Read More

The nature and significance of the Faroe-Shetland Terrane: Linking Archaean basement blocks across the North Atlantic (2018)
Journal Article
Holdsworth, R., Morton, A., Frei, D., Gerdes, A., Strachan, R., Dempsey, E., …Whitham, A. (2019). The nature and significance of the Faroe-Shetland Terrane: Linking Archaean basement blocks across the North Atlantic. Precambrian research, 321, 154-171. doi:10.1016/j.precamres.2018.12.004

Core samples of the continental basement rocks that underlie the eastern Faroe-Shetland Basin (FSB) and its inshore margins west of Shetland reveal a suite of predominantly granodioritic to granitic orthogneisses (including TTG), together with lesser... Read More

Tectonic evolution of the Southern Negros Geothermal Field and implications for the development of fractured geothermal systems (2018)
Journal Article
Pastoriza, L. R., Holdsworth, R. E., Mccaffrey, K. J. W., & Dempsey, E. (2018). Tectonic evolution of the Southern Negros Geothermal Field and implications for the development of fractured geothermal systems. Geofluids, 2018, doi:10.1155/2018/6025038

Fluid flow pathway characterisation is critical to geothermal exploration and exploitation. In fractured geothermal reservoirs, it requires a good understanding of the structural evolution together with the fracture distribution and fluid flow proper... Read More

Evidence for basement reactivation during the opening of the Labrador Sea from the Makkovik Province, Labrador, Canada: Insights from field data and numerical models (2018)
Journal Article
Peace, A. L., Dempsey, E. D., Schiffer, C., Welford, J., Mccaffrey, K. J., Imber, J., & Phethean, J. J. (2018). Evidence for basement reactivation during the opening of the Labrador Sea from the Makkovik Province, Labrador, Canada: Insights from field data and numerical models. Geosciences, 8(8), 308. doi:10.3390/geosciences8080308

The onshore exposures adjacent to modern, offshore passive continental margins may preserve evidence of deformation from the pre‐, syn‐, and post‐rift phases of continental breakup that allow us to investigate the processes associated with and contro... Read More

An evaluation of Mesozoic rift-related magmatism on the margins of the Labrador Sea: Implications for rifting and passive margin asymmetry (2016)
Journal Article
Peace, A., McCaffrey, K., Imber, J., Phethean, J., Nowell, G., Gerdes, K., & Dempsey, E. (2016). An evaluation of Mesozoic rift-related magmatism on the margins of the Labrador Sea: Implications for rifting and passive margin asymmetry. Geosphere, 12(6), 1701-1724. doi:10.1130/GES01341.1

The Labrador Sea is a small (∼900 km wide) ocean basin separating southwest Greenland from Labrador, Canada. It opened following a series of rifting events that began as early as the Late Triassic or Jurassic, culminating in a brief period of seafloo... Read More

New structural and Re-Os geochronological evidence constraining the age of faulting and associated mineralization in the Devonian Orcadian Basin, Scotland (2016)
Journal Article
Dichiarante, A. M., Holdsworth, R. E., Dempsey, E. D., Selby, D., McCaffrey, K. J., Michie, U. M. L., …Bonniface, J. (2016). New structural and Re-Os geochronological evidence constraining the age of faulting and associated mineralization in the Devonian Orcadian Basin, Scotland. Journal of the Geological Society, 173(3), 457-473. doi:10.1144/jgs2015-118

The Devonian Orcadian Basin in northern Scotland belongs to a regionally linked system of post-Caledonian continental basins extending northwards to western Norway and eastern Greenland. Extensional fault systems that cut the Orcadian Basin sequences... Read More

Silurian–Devonian magmatism, mineralization, regional exhumation and brittle strike-slip deformation along the Loch Shin Line, NW Scotland (2015)
Journal Article
Holdsworth, R. E., Dempsey, E., Selby, D., Darling, J. R., Feely, M., Costanzo, A., …Porter, S. J. (2015). Silurian–Devonian magmatism, mineralization, regional exhumation and brittle strike-slip deformation along the Loch Shin Line, NW Scotland. Journal of the Geological Society, 172(6), 748-762. doi:10.1144/jgs2015-058

The Loch Shin Line is a geological–geophysical lineament associated with a zone of mantle-derived appinites, granites and strike-slip faulting that runs NW–SE across the Moine Nappe, northern Scotland. U–Pb zircon and Re–Os molybdenite dating of the... Read More

A geological explanation for intraplate earthquake clustering complexity: The zeolite-bearing fault/fracture networks in the Adamello Massif (Southern Italian Alps) (2014)
Journal Article
Dempsey, E. D., Holdsworth, R. E., Imber, J., Bistacchi, A., & Di Toro, G. (2014). A geological explanation for intraplate earthquake clustering complexity: The zeolite-bearing fault/fracture networks in the Adamello Massif (Southern Italian Alps). Journal of Structural Geology, 66, 58-74. doi:10.1016/j.jsg.2014.04.009

Interconnected networks of faults and veins filled with hydrothermal minerals such as zeolite are widespread in many orogenic terrains. These fractures commonly form at relatively low temperatures (e.g.

Structural characteristics and Re-Os dating of quartz-pyrite veins in the Lewisian Gneiss Complex, NW Scotland: Evidence of an Early Paleoproterozoic hydrothermal regime during terrane amalgamation (2014)
Journal Article
Vernon, R., Holdsworth, R., Selby, D., Dempsey, E., Finlay, A., & Fallick, A. (2014). Structural characteristics and Re-Os dating of quartz-pyrite veins in the Lewisian Gneiss Complex, NW Scotland: Evidence of an Early Paleoproterozoic hydrothermal regime during terrane amalgamation. Precambrian research, 246, 256-267. doi:10.1016/j.precamres.2014.03.007

In the Archaean basement rocks of the Assynt and Gruinard terranes of the mainland Lewisian Complex in NW Scotland, a regional suite of quartz-pyrite veins cross-cut regional Palaeoproterozoic (Badcallian, ca. 2700. Ma; Inverian, ca. 2480. Ma) fabric... Read More

Mica-controlled anisotropy within mid-to-upper crustal mylonites: an EBSD study of mica fabrics in the Alpine Fault Zone, New Zealand (2011)
Journal Article
Dempsey, E. D., Prior, D. J., Mariani, E., Toy, V. G., & Tatham, D. J. (2011). Mica-controlled anisotropy within mid-to-upper crustal mylonites: an EBSD study of mica fabrics in the Alpine Fault Zone, New Zealand. Geological Society Special Publications, 360(1), 33-47. doi:10.1144/SP360.3

The lattice preferred orientation (LPO) of both muscovite and biotite were measured by electron backscatter diffraction (EBSD) and these data, together with the LPOs of the other main constituent minerals, were used to produce models of the seismic v... Read More