@article {Szpak2012,
	title = {{Geophysical and geochemical survey of a large marine pockmark on the Malin Shelf, Ireland}},
	journal = {Geochemistry, Geophysics, Geosystems},
	volume = {13},
	number = {1},
	year = {2012},
	month = {jan},
	pages = {n/a{\textendash}n/a},
	abstract = {Marine pockmarks are a specific type of seabed geological setting resembling craters or pits and are considered seabed surface expressions of fluid flow in the subsurface. A large composite pockmark on the Malin Shelf, off the northern coast of Ireland was surveyed and ground truthed to assess its activity and investigate fluid related processes in the subsurface. Geophysical (including acoustic and electromagnetic) data confirmed the subsurface presence of signatures typical of fluids within the sediment. Shallow seismic profiling revealed a large shallow gas pocket and typical gas related indicators such as acoustic blanking and enhanced reflectors present underneath and around the large pockmark. Sulphate profiles indicate that gas from the shallow reservoir has been migrating upwards, at least recently. However, there are no chimney structures observed in the sub-bottom data and the migration pathways are not apparent. Electromagnetic data show slightly elevated electrical conductivity on the edges of the pockmarks and a drop below regional levels within the confines of the pockmark, suggesting changes in physical properties of the sediment. Nuclear Magnetic Resonance (NMR) experiments were employed to characterize the organic component of sediments from selected depths. Very strong microbial signatures were evident in all NMR spectra but microbes outside the pockmark appear to be much more active than inside. These observations coincide with spikes in conductivity and the lateral gas bearing body suggesting that there is an increase in microbial activity and biomass when gas is present. Copyright 2012 by the American Geophysical Union.},
	keywords = {electromagnetic, Malin Shelf, microbial, NMR, organic matter, pockmark},
	issn = {15252027},
	doi = {10.1029/2011GC003787},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84856247401\&partnerID=tZOtx3y1},
	author = {Szpak, M. T. and Monteys, X. and O{\textquoteright}Reilly, S. and Simpson, A. J. and Garcia, X. and Evans, R. L. and Allen, C. C. R. and McNally, D. J. and Courtier-Murias, D. and Kelleher, B. P.}
}
@article {Miensopust2011,
	title = {{Lithospheric structures and Precambrian terrane boundaries in northeastern Botswana revealed through magnetotelluric profiling as part of the Southern African Magnetotelluric Experiment}},
	journal = {Journal of Geophysical Research},
	volume = {116},
	number = {B2},
	year = {2011},
	month = {feb},
	pages = {B02401},
	abstract = {Within the framework of the Southern African Magnetotelluric Experiment a focused study was undertaken to gain improved knowledge of the lithospheric geometries and structures of the westerly extension of the Zimbabwe craton (ZIM) into Botswana, with the overarching aim of increasing our understanding of southern African tectonics. The area of interest is located in northeastern Botswana, where Kalahari sands cover most of the geological terranes and very little is known about lithospheric structures and thicknesses. Some of the regional-scale terrane boundary locations, defined based on potential field data, are not sufficiently accurate for local-scale studies. Investigation of the NNW-SSE orientated, 600 km long ZIM line profile crossing the Zimbabwe craton, Magondi mobile belt, and Ghanzi-Chobe belt showed that the Zimbabwe craton is characterized by thick (\~{}220 km) resistive lithosphere, consistent with geochemical and geothermal estimates from kimberlite samples of the nearby Orapa and Letlhakane pipes (\~{}175 km west of the profile). The lithospheric mantle of the Ghanzi-Chobe belt is resistive, but its lithosphere is only about 180 km thick. At crustal depths a northward dipping boundary between the Ghanzi-Chobe and the Magondi belts is identified, and two middle to lower crustal conductors are discovered in the Magondi belt. The crustal terrane boundary between the Magondi and Ghanzi-Chobe belts is found to be located further to the north, and the southwestern boundary of the Zimbabwe craton might be further to the west, than previously inferred from the regional potential field data. Copyright 2011 by the American Geophysical Union.},
	issn = {0148-0227},
	doi = {10.1029/2010JB007740},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-79951472921\&partnerID=tZOtx3y1},
	author = {Miensopust, M. P. and Jones, A. G. and Muller, M. R. and Garcia, X. and Evans, R. L.}
}
