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GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,
VOL. 11,
Q03006,
12 PP., 2010
doi:10.1029/2009GC002899 [Citation]
A data brief on magnesium isotope compositions of marine calcareous sediments and ferromanganese nodules
Laboratoire de Sciences de la Terre, ENS Lyon, 46 allée d'Italie, F-69007 Lyon, France
Laboratoire de Sciences de la Terre, ENS Lyon, 46 allée d'Italie, F-69007 Lyon, France
The magnesium isotope compositions of 26 ferromanganese nodules from various oceans and 22 calcareous sediment samples from Ocean Drilling Program (ODP) leg sites from the Atlantic (ODP704, leg 114) and the Pacific (ODP846, leg 138) have been analyzed by Multicollector–Inductively Coupled Plasma–Mass Spectrometer. Most nodules from the Pacific and Atlantic oceans have δ26Mg (between −1.89 ± 0.24 and −0.54 ± 0.01‰, 2σ) scatter around the average ocean water value of −0.86 ± 0.12‰. Indian Ocean nodules display a large variation in δ26Mg ranging from −2.94 ± 0.46 to +0.69 ± 0.18‰. As for calcareous sediments, δ26Mg variations range between −2.94 ± 0.50 and −0.71 ± 0.45‰ and between −4.00 ± 0.31 and −1.63 ± 0.09‰ for the Atlantic and the Pacific legs, respectively. This study allows the construction of a thread of global δ26Mg mapping in Fe-Mn nodules and suggests that what controls the δ26Mg variations of marine calcareous sediments is complex and probably linked both to a mixture of different tests of micro-organisms and to diagenesis.
Received 15 October 2009; accepted 30 December 2009; published 11 March 2010.
Citation: (2010), A data brief on magnesium isotope compositions of marine calcareous sediments and ferromanganese nodules, Geochem. Geophys. Geosyst., 11, Q03006, doi:10.1029/2009GC002899.
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