U-Series, 14C, and Stable Isotope Studies of Recent Phosphatic“Protocrusts” from the Peru Margin
Published:January 01, 2000
W.C Burnett, C.R Glenn, C.C Yeh, M Schultz, J Chanton, M Kashgarian, 2000. "U-Series, 14C, and Stable Isotope Studies of Recent Phosphatic“Protocrusts” from the Peru Margin", Marine Authigenesis: From Global to Microbial, Craig R. Glenn, Liliane Prévôt-Lucas, Jacques Lucas
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Phosphorites on the Peru shelf occur mainly as dark and dense conglomerate (“Diphosphates) and occasionally as soft, friable (“F”-phosphatcs) protocrusts, which appear as laterally extensive, centimeter–thick plates of bored, pbosphatized sediment. Several undisturbed and well–documented samples of these protocrusts were collected by box coring and submersible operations during an expedition of the R/N Seaward Johnson in 1992. Three of these crusts were analyzed in layer-by-layer fashion for U-series isotopes, while two were analyzed for AMS-14C. and stable carbon isotopes. Unlike the D-phosphates, which may show a progressive decrease in their δ13C values (from 0...
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Marine Authigenesis: From Global to Microbial
This volume is a collection of 33 state-of-the-art papers focusing on various aspects of authigenic and diagenetic marine minerals and related global elemental cycling. The commingling of the various studies of authigenic minerals in this volume, including the most recent advances in knowledge concerning the occurrence and origins of phosphorites, glauconites, dolomites, siderites, manganese-iron associations, barites, ironstones, and other marine chemical sediments/sedimentary rocks of early authigenic/diagenetic origin, is partly the result of the increasing awareness that there are many overlaps, even direct co-associations, between different authigenic minerals, both in time, space, and genesis. Taken together, this compilation represents a holistic approach towards marine authigenesis that considers the integrated whole more than the simple sum of its parts.