Minor element geochemistry of Lake Michigan ferromanganese nodules
نویسندگان
چکیده
منابع مشابه
Minor Element Geochemistry of Lakemichigan Ferromanganese Nodules
Samples of ferromanganese nodules from several localities in Lake Michigan have been analyzed for their minor element content utilizing neutron activation techniques. The thorium and uranium levels in Lake Michigan nodules exhibit marked dissimilarities with marine nodules. The radium content of these freshwater nodules is substantially higher than the reported marine values. The concentrations...
متن کاملContinued Investigation of the Light Element Geochemistry of Tagish Lake
Introduction: Preliminary analysis of the light element stable isotope geochemistry of the Tagish Lake primitive carbonaceous chondrite showed that it was a carbonate-rich meteorite containing abundant presolar grains [1, 2]. Tagish Lake seemed to be more carbon-rich than CI chondrites, with over 5 wt. % carbon distributed almost equally between organic and inorganic (mostly carbonate) componen...
متن کاملAccretion of ferromanganese nodules that form pavement in Second Connecticut Lake, New Hampshire.
We discovered ferromanganese nodules that measure up to 46 cm in diameter with stromatolitic growth patterns in the western central near-shore portion of Second Connecticut Lake, Pittsburg, New Hampshire. They occur as four distinct morphotypes: irregular laminated convex plates that form concentric rings around a nucleating center ("domed-plate"), continuous pustular pavements that extend >10 ...
متن کاملReply to Boudreau: Morphologic expression of ferromanganese nodules
The statement that nodule formation, especially morphology, can be predicted by the Boudreau diagenetic model led us to state that ‘‘diagenetic models that claim to predict nodule growth rate and morphologies from elemental concentrations (1) are not verified by our data’’ for Second Connecticut Lake (SCL), New Hampshire (2). Comments on metal gradients and elemental concentration of manganese ...
متن کاملThe State of Lake Michigan
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ژورنال
عنوان ژورنال: Earth and Planetary Science Letters
سال: 1970
ISSN: 0012-821X
DOI: 10.1016/0012-821x(70)90157-3