 | | Journal (article/letter/editorial) | | (1999) 67–80 Rock magnetism and palaeomagnetism of greigite-bearing mudstones in the Italian peninsula Leonardo...tumbling alternating field (AF) demagnetization). Greigite (Fe3 S4 ) was positively identified in most samples...samples. In agreement with previous studies of greigite, the sediments display: thermal decomposition...remanent magnetization (RRM). We also found that greigite-bearing sediments are particularly sensitive to...mean to screen a rock sample for the presence of greigite, which relies on its SD behaviour in field impressed |  | | Journal (article/letter/editorial) | | mechanisms of remagnetization involving sedimentary greigite (Fe3S4) Andrew P. Roberts*, Richard Weaver1 Southampton...2004 Editor: V. Courtillot Abstract Sedimentary greigite (Fe3S4) is being increasingly implicated as the...microanalysis, to identify greigite and to characterize the mode of occurrence and the relationships between...between the observed greigite and other authigenic and detrital mineral phases. This detailed observational...mechanisms for remagnetization involving greigite: (1) neoformation of greigite on the surfaces of early diagenetic |  | Fu, Yanzhe, von Dobeneck, Tilo, Franke, Christine, Heslop, David, Kasten, Sabine (2008) Rock magnetic identification and geochemical process models of greigite formation in Quaternary marine sediments from the Gulf of Mexico (IODP Hole U1319A) Earth and Planetary Science Letters, 275 (3) 233-245 doi:10.1016/j.epsl.2008.07.034 | Journal (article/letter/editorial) | | identification and geochemical process models of greigite formation in Quaternary marine sediments from...rock magnetism Gulf of Mexico IODP Expedition 308 greigite pyrite diagenesis sulfate methane transition non-steady...enriched by the ferrimagnetic iron-sulfide mineral greigite (Fe3S4) were detected by diagnostic magnetic properties... we develop two conceptual reaction models of greigite formation in non-steady depositional environments...The “sulfidization model” predicts single or twin greigite layers by incomplete transformation of iron monosulfides |  | Jørgensen, Bo Barker, Böttcher, Michael E., Lüschen, Holger, Neretin, Lev N., Volkov, Igor I. (2004) Anaerobic methane oxidation and a deep H2S sink generate isotopically heavy sulfides in Black Sea sediments. Geochimica et Cosmochimica Acta, 68 (9) 2095-2118 doi:10.1016/j.gca.2003.07.017 | Journal (article/letter/editorial) | | 2004 Copyright © 2004 Elsevier Ltd Printed in the USA. All rights reserved 0016-7037/04 $30.00 ⫹ .00 Pergamon...iron sulfide above which distinct horizons of greigite and pyrite formation occur. The pore water gradients...amorphous iron monosulfide and subsequently to greigite, and possibly mackinawite, in the sulfidized sediment...allow a clear separation of greigite, Fe3S4, among the two fractions. Greigite dissolves in the first step...which the S° is included in the second step. The greigite distribution may be ca. 2/3 in the AVS fraction |  | | Journal (article/letter/editorial) | | Arthur C., Jr. Beryl from the Oxford mine, Troup County, Georgia Bailey, Roy A. Volcanism and the upper...Physicaland chemical data for crandallite from Alachua County, Florida Boles, James R. Composition,optical properties...Melanophlogitefrom Mount Hamilton, Santa Clara County, California Cooper,W. F. Chargerefinementof a light-atommineral...Melanophlogitefrom Mount Hamilton, Santa Clara CountY, California Dunning, G. E. The studio handbookof...Silhydrite,3SiO2.H2O,a new mineral from Trinity County, California Gupta,Alok K. The systemforsterite |  | | Report (issue) | | have the same thickness over their extent of occurrence and patchy layers are discontinuous layers with...indicate generally closed lake conditions. A unique occurrence at 62.4 to 62.5 m (seen as a spike in Fig. 1)...detrital iron and iron-titanium oxides, as well as greigite. The Fe and Fe-Ti oxides occur in a number of...in large (coarse silt) volcanic rock fragments; greigite is also present in this sample. Petrographic observations...fine grained detrital magnetite or diagenetic greigite (FesS^ magnetic sulfide; Reynolds and others, |
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