378 research outputs found
Annotated record of the detailed examination of Mn deposits from Northwestern Pacific seamounts along the Izu-Bonin Trench
No full textAnnotated record of the detailed examination of Mn deposits from Northwestern Pacific seamounts along the Izu-Bonin Trenc
Component parts of the World Heat Flow Data Collection
No full textComponent parts of the World Heat Flow Data Collectio
Component parts of the World Heat Flow Data Collection
No full textComponent parts of the World Heat Flow Data Collectio
(Figure 8, page 60) Fe-Mn concentrations across ferromanganese crusts recovered from the Northwestern Pacific seamounts along the Izu-Bonin Trench
No full textValues extracted from curves using the WebPlotDigitizer program (http://arohatgi.info/WebPlotDigitizer/
Component parts of the World Heat Flow Data Collection
No full textComponent parts of the World Heat Flow Data Collectio
Component parts of the World Heat Flow Data Collection
No full textComponent parts of the World Heat Flow Data Collectio
Component parts of the World Heat Flow Data Collection
No full textComponent parts of the World Heat Flow Data Collectio
Component parts of the World Heat Flow Data Collection
No full textComponent parts of the World Heat Flow Data Collectio
Magnetic anomalies near the axial part of the North Fiji Basin
No full textJAMSTEC Journal of Deep Sea Research special volume "Deep sea research in Subduction Zones, Spreading Centers and Backarc Basins
Analysis of ferromanganese deposits from the Northwestern Pacific seamounts
No full textFine-scale dating is crucial to understanding the growth and environments of formation of marine manganese deposits. The paleomagnetic method of dating of manganese nodules and crusts has been attempted but with no success so far. We measured remanent magnetization (RM) on up to 75-mm-thick hydrogenetic crusts at intervals of 2.5 mm after mineralogical and chemical examination, careful separation, and alternative field demagnetization. Stable sharp RM and well-correlated polarity-change patterns between four samples made it possible to identify the Pliocene-Quaternary magnetic chrons in them. These data show that the three crusts have grown continuously at rates of 14-17 mm/m.y. since the Early Pliocene. This is three or four times faster than those for Central Pacific seamount hydrogenetic crusts. Estimates of growth rate based on determination of Co-flux are within this range. Magnetostratigraphy therefore appears to be a powerful method for dating hydrogenetic manganese crusts when supported by conventional dating methods. These results encourage finer-scale investigations which promise more detailed paleoceanographic reconstruction
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