Publications
339 results found
Emmerton S, Muxworthy AR, Sephton MA, 2013, A magnetic solution to the Mupe Bay mystery, Marine and Petroleum Geology, Vol: 46, Pages: 165-172, ISSN: 0264-8172
An outcrop of Wealden beds at Mupe Bay (UK) is associated with a key piece of evidence for the timing of hydrocarbon migration in the Wessex Basin. A conglomeratic bed contains oil-stained clasts and matrix that appear different upon superficial observation. Conventional interpretations assign differences to the erosion and transport of oil-cemented clasts by Wealden rivers before their incorporation into a later stained conglomeratic bed. This scenario constrains the onset of oil migration in the basin to the Early Cretaceous; however, arguments have been put forward for single phase staining.Magnetic information may provide new ways to examine the Mupe Bay record of oil migration. Migrating fluids such as hydrocarbons have been shown to cause chemical conditions suitable for the alteration or formation of authigenic magnetite resulting in associated chemical remanent magnetization (CRM). Magnetic characterization reveals both the matrix and clasts contain multi-domain magnetite but abundant hematite only exists within the clasts. Hysteresis parameters show the matrix has more multi-domain and likely larger magnetic grains than the clasts.Magnetic directions are different in the clasts and matrix supporting a two-phase oil-staining event. Moreover, paleomagnetic directions for the clasts after tilt correction (82.6°N and 155.2°E) are consistent with biodegradation processes in the Early Cretaceous. Consistent directions in separate clasts imply the biodegradation and magnetite formation took place following transportation and incorporation of the oil-cemented clasts into the conglomerate bed. Magnetic directions reveal that the Mupe Bay matrix has a remanent magnetization corresponding to today’s magnetic field, confirming the matrix represents an active oil seep.This study represents an unprecedented use of magnetic data to date the onset of oil migration in a basin. The classic two-stage oil-staining scenario, which constrains the onset in the Wesse
Dodd S, Muxworthy AR, Mac Niocaill C, 2013, Taking the pulse of the Parana-Etendeká large igneous province (poster), IAGA
Elmore RD, Muxworthy AR, Aldana MM, 2012, Remagnetization and chemical alteration of sedimentary rocks, Remagnetization and Chemical Alteration of Sedimentary Rocks, Editors: Elmore, Muxworthy, Aldana, Mena, London, Publisher: Geological Society
Chang L, Roberts AP, Williams W, et al., 2012, Giant magnetofossils and hyperthermal events, Earth and Planetary Science Letters, Vol: 351-352, Pages: 258-269
Almeida TP, Muxworthy AR, Williams W, et al., 2012, Dynamic exsolution of titanomagnetites and their associated magnetic response examined by complementary environmental TEM and off-axis electron holography, European Microscopy Congress
Emmerton S, Muxworthy AR, Sephton MA, 2012, Magnetic characterization of oil sands at Osmington Mills and Mupe Bay, Wessex Basin, UK, Remagnetization and Chemical Alteration of Sedimentary Rocks, Editors: Elmore, Muxworthy, Aldana, Mena, Elmore, Muxworthy, Aldana, Mena, London, Publisher: Geological Society, Pages: 189-198
Biggin AJ, Badejo S, Shaw J, et al., 2012, How does cooling rate affect the intensity of thermoremanent magnetisation in samples containing multidomain and interacting single domain ferrimagnetic grains? (poster), EGU
Harrison RJ, Muxworthy AR, Lappe SCLL, 2012, FORCintense: A graphical implementation of the Preisach method of paleointensity estimation within FORCinel, EGU
Muxworthy AR, Evans ME, 2012, How well can “single crystals” record the geomagnetic field?, Magnetic Relaxation
Almeida T, Muxworthy AR, Williams W, et al., 2012, Dynamic chemical processes examined by in situ TEM and the implications for investigating palaeomagnetism, Magnetic Relaxation
Emmerton S, Muxworthy AR, Sephton MA, et al., 2012, A relationship between biodegradation and magnetisation in oil sands, Magnetic Relaxation
Elmore RD, Muxworthy AR, Aldana MM, et al., 2012, Remagnetization and chemical alteration of sedimentary rocks, London, Publisher: Geological Society
Roberts AP, Chang L, Rowan CJ, et al., 2011, Magnetic properties of sedimentary greigite (Fe3S4): An update (Invited), AGU Fall
Muxworthy AR, Bland PA, Collins GS, et al., 2011, Heterogeneous Shock In Porous Chondrites: Implications For Allende Magnetization, AGU Fall
Bland PA, Muxworthy AR, Collins GS, et al., 2011, Heterogeneous shock in porous chondrites: Implications for Allende magnetization, 74th Annual Meeting of the Meteoritical-Society, Publisher: Wiley-Blackwell, Pages: A22-A22, ISSN: 1086-9379
Muxworthy AR, Taylor S, 2011, Evaluation of the domain-state corrected multiple-specimen absolute palaeointensity protocol: a test of historical lavas from Iceland., EGU, Pages: 118-127
Emmerton S, Muxworthy AR, Sephton M, 2011, Magnetic Characterisation of Oil Sands and Well Cores, AAPG
Muxworthy AR, Harrison R, 2011, FORC Workshop – Theory & Practical examples., Magnetic Interactions
Muxworthy AR, Heslop D, Williams J, 2011, Magnetic dating of major flood events, Magnetic Interactions
Emmerton S, Muxworthy AR, Sephton M, 2011, Magnetic characterisation of oil sands and well cores, Magnetic Interactions
Muxworthy AR, Ji X, Ridley V, et al., 2011, Multi-protocol palaeointensity determination from middle Brunhes Chron volcanics, Datong Volcanic Province, China, Physics of the Earth and Planetary Interiors, Vol: 187, Pages: 188-198
Krasa D, Muxworthy AR, Williams W, 2011, Room- and low-temperature magnetic properties of two-dimensional magnetite particle arrays, Geophysical Journal International, Vol: 185, Pages: 167-180
Muxworthy AR, Heslop D, Paterson GA, et al., 2011, A Preisach method to estimate absolute paleofield intensity under the constraint of using only isothermal measurements: 2. experimental testing, Journal of Geophysical Research, Vol: 116
Muxworthy AR, Heslop D, 2011, A Preisach method to estimate absolute paleofield intensity under the constraint of using only isothermal measurements: 1. theoretical framework, Journal of Geophysical Research, Vol: 116
Williams W, Muxworthy AR, Evans ME, 2011, A micromagnetic investigation of magnetite grains in the form of Platonic polyhedra with surface roughness, Geochemistry, Geophysics, Geosystems, Vol: 12
Muxworthy AR, 2011, Magnetic interactions: Love thy neighbour?, BGA Advanced in Geophysics
Emmerton S, Muxworthy AR, Hezel DC, et al., 2011, Magnetic characteristics of CV chondrules with paleointensity implications, Journal of Geophysical Research, Vol: in press
Williams W, Chang L, Muxworthy AR, et al., 2010, Micromagnetic Modeling of Framboidal Grains of Greigite (poster), AGU Fall
Barron L, Williams W, Muxworthy AR, 2010, The effect of exchange and magnetostatic interactions across grain boundaries (poster), AGU Fall
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