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Pyrite with high Mn content from the Nankai Trough formed from subduction-induced cold seepage

, : Pyrite with high Mn content from the Nankai Trough formed from subduction-induced cold seepage. Marine Geology 118(3-4): 303-313

Pyrite and abundant calcite occur in a sandstone pipe collected from the eastern Nankai Trough. Electron microprobe analysis of the pyrite indicates that it contains appreciable amounts of manganese (up to 1.5 MnS (sub 2) mole %). The present data and previous analytical data on pyrite indicate that manganese content of anoxic sedimentary pyrite is high but of hydrothermal pyrite very low. In the pyrite studied here, isomorphous substitution of manganese occurs. Stable isotope data on calcite coexisting with the pyrite as well as chemical data on the advecting fluids indicate that the advecting fluids are characterized by reducing conditions, high concentrations of methane, hydrogen sulfide and manganese and high Mn/Fe ratios. These characteristics could be responsible for the high manganese content of pyrite. Adsorption of manganese by a precursor (iron sulfide) may also be an important factor. The present study demonstrates that the manganese content of pyrite is potentially a useful indicator of sedimentary and diagenetic processes and of the geological characteristics of ancient terrestrial sedimentary rocks.


DOI: 10.1016/0025-3227(94)90090-6

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Sudoł-Szopińska, I.; Wojciechowski, K.; Szczepkowski, M.; Sarti, D.; Jakubowski, W., 2002: Endosonography of the rectum and other imaging methods in the diagnosis of bowel inflammatory diseases. This paper presents the usefulness of rectal endosonography in the diagnostics of the rectal wall and anorectal lesions in patients with inflammatory bowel diseases, mainly with Crohn's disease. Value of endosonography, computed tomography an...

Loffredo, S.; Ayala, F.; Marone, G.; Delfino, G.; Stranges, S.; Marone, G., 2009: Immunopathogenesis of psoriasis and pharmacological perspectives. Psoriasis is a chronic inflammatory disorder resulting from a combination of genetic and environmental factors, although the precise causal agents have not yet been identified. The immune system has a major role in the development of psoriasis, an...

Steven T.A.; Cunningham C.G.; Rowley P.D., 1978: Geology and mineralization in the Marysvale mining area, West-central Utah. Utah Geological Association Publication 7): 67-69

Foster, G.L., 1927: A note on tissue respiration in relation to thyroidectomy. Rate of O2 absorption is lower than normal.

Skacel V.; Minarik L., 1988: Perioperative electrostimulation of the anal sphincters. To facilitate anatomical orientation at surgical reconstructions of the anal sprincters recommendation is made of the method of controlled perioperation electrostimulation which making possible the identification of muscle fibres in the operative...

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Takeya K.; Itoigawa M.; Ando H.; Yajima M.; Furukawa H., 1983: Mechanism of positive inotropic action of helenalin a sesqui terpene lactone in guinea pig ventricular myo cardium. Japanese Journal of Pharmacology 33(SUPPL): 278P

Kifune, Teiji., 2003: From parasitic insects to helminthic parasites - trend to systematics from ecology. Medical Bulletin of Fukuoka University. June; 302: 123-127

Blumentals, A.; Eichenholz, A.; Mulhausen, R.O., 1965: Acid-Base Balance Determinations In Clinical Practice. 2. Respiratory Acid-Base Disturbances. Postgraduate Medicine 38: A46-58 Contd

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