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Journal articleHoward KT, Benedix GK, Bland PA, et al., 2011,
Modal mineralogy of CM chondrites by X-ray diffraction (PSD-XRD): Part 2. Degree, nature and settings of aqueous alteration
, GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 75, Pages: 2735-2751, ISSN: 0016-7037- Author Web Link
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- Citations: 143
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Conference paperMuxworthy 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 -
Journal articleBland PA, Howard LE, Prior DJ, et al., 2011,
Earliest rock fabric formed in the Solar System preserved in a chondrule rim
, NATURE GEOSCIENCE, Vol: 4, Pages: 244-247, ISSN: 1752-0894- Author Web Link
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- Citations: 58
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Conference paperMuxworthy AR, 2011,
Magnetic Interactions: Love thy Neighnbour?
, EGU -
Journal articleCobden LJ, Tong CH, Warner MR, 2011,
INVERSION OF FULL ACOUSTIC WAVEFIELD IN LOCAL HELIOSEISMOLOGY: A STUDY WITH SYNTHETIC DATA
, ASTROPHYSICAL JOURNAL, Vol: 727, ISSN: 0004-637X -
Conference paperEmmerton S, Muxworthy AR, Sephton M, 2011,
Magnetic characterisation of oil sands and well cores
, Magnetic Interactions -
Journal articleArnold T, Schönbächler M, Rehkämper M, et al., 2011,
Erratum: Measurement of zinc stable isotope ratios in biogeochemical matrices by double-spike MC-ICPMS and determination of the isotope ratio pool available for plants from soil.
, Anal Bioanal Chem, Vol: 399, ISSN: 1618-2650 -
Conference paperMuxworthy AR, Harrison R, 2011,
FORC Workshop – Theory & Practical examples.
, Magnetic Interactions -
Conference paperMuxworthy AR, Heslop D, Williams J, 2011,
Magnetic dating of major flood events
, Magnetic Interactions -
Journal articleMartins Z, Sephton MA, Foing BH, et al., 2011,
Extraction of amino acids from soils close to the Mars Desert Research Station (MDRS), Utah
, International Journal of Astrobiology, Vol: 10, Pages: 231-238 -
Journal articleKrasa 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 -
Journal articleWilliams 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 -
Conference paperMuxworthy AR, 2011,
Magnetic interactions: Love thy neighbour?
, BGA Advanced in Geophysics -
Journal articleKamo S, Lana C, Morgan J, 2011,
U–Pb ages of shocked zircon grains link distal K–Pg boundary sites in Spain and Italy with the Chicxulub impact
, Earth and Planetary Science Letters, Vol: 310, Pages: 401-408The U–Pb ages of shocked zircon crystals from the Chicxulub impact crater and Cretaceous-Paleogene (K-Pg) boundary sites in Haiti, the USA, and Canada, and the pattern of decreasing particle size with paleodistance from the crater, have been used as evidence of a genetic link between Chicxulub and the K–Pg boundary. Despite this, the inference that the K–Pg boundary layer formed as a direct consequence of the Chicxulub impact has been repeatedly questioned. Here we present U–Pb (ID-TIMS) ages and textural evidence of shock metamorphosed zircon grains from the K–Pg boundary at Caravaca, Spain, and Petriccio, Italy, that establish a causal connection between the impact and formation of the K–Pg boundary layer. The shocked zircon grains give data that produce a characteristic age pattern, which indicates a primary source age of 549.5 ± 5.7 Ma and a secondary event at the approximate time of impact at 66 Ma. The intensity of the shock features is proportional to the degree of isotopic resetting, and all textural features and ages are analytically identical to those of previously analyzed zircon from Chicxulub and K–Pg boundary sites in North America. Caravaca and Petriccio were > 8000 km from Chicxulub at the time of impact, and are therefore the farthest K–Pg sites identified that can be linked to Chicxulub through the dating of individual shocked zircon grains. We conclude that the combined age data and textural observations provide unambiguous evidence that ejecta from the Chicxulub impact formed the global K–Pg boundary layer. These data cannot be explained by the alternative scenario that the Chicxulub impact occurred ~ 300 ka prior to the K–Pg boundary.
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Journal articleEmmerton S, Muxworthy AR, Hezel DC, et al., 2011,
Magnetic characteristics of CV chondrules with paleointensity implications
, Journal of Geophysical Research, Vol: in press -
Journal articleMuxworthy 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 -
Journal articleMuxworthy 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 -
Journal articleMarlow JJ, Martins Z, Sephton MA, 2011,
Organic host analogues and the search for life on Mars
, INT J ASTROBIOL, Vol: 10, Pages: 31-44, ISSN: 1473-5504Mars analogue sites represent vital tools in our continued study of the Red Planet; the similar physico-chemical processes that shape a given analogue environment on Earth allow researchers to both prepare for known Martian conditions and uncover presently unknown relationships. This review of organic host analogues – sites on Earth that mimic the putatively low organic content of Mars – examines specific locations that present particular Mars-like obstacles to biological processes. Low temperatures, aridity, high radiation and oxidizing soils characterise modern-day Mars, while acid–saline waters would have presented their own challenges during the planet's warmer and wetter past. By studying each of these hurdles to life on Earth, scientists can prepare instruments headed for Mars and identify the best locations and approaches with which to look for biological signatures. As our use of organic host analogues becomes increasingly sophisticated, researchers will work to identify terrestrial sites exhibiting multiple Mars-like conditions that are tailored to the distinct mineralogical and physical characteristics of Martian locations. Making use of organic host analogues in these ways will enhance the search for signs of past or present life on Mars.
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BookRothery DA, Gilmour I, Sephton MA, 2011,
An Introduction to Astrobiology
, Cambridge, Publisher: Cambridge University Press, ISBN: 9781107600935 -
Book chapterSephton MA, 2011,
Meteoritics
, Encyclopedia of Geobiology, Editors: Reitner, Thiel, Publisher: Springer Verlag, Pages: 568-574, ISBN: 9781402092114The Encyclopedia of Geobiology is designed as a key reference for students, researchers,teachers, and the informed public to provide basic, but comprehensible ...
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