Ultrafine-scale magnetostratigraphy of marine ferromanganese crust
Geology, ISSN: 0091-7613, Vol: 39, Issue: 3, Page: 227-230
2011
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Article Description
Hydrogenetic ferromanganese crusts are iron-manganese oxide chemical precipitates on the seafloor that grow over periods of tens of millions of years. Their secular records of chemical, mineralogical, and textural variations are archives of deep-sea environmental changes. However, environmental reconstruction requires reliable high-resolution age dating. Earlier chronological methods using radiochemical and stable isotopes provided age models for ferromanganese crusts, but have limitations on the millimeter scale. For example, the reliability of Be/Be chronometry, commonly considered the most reliable technique, depends on the assumption that the production and preservation of Be are constant, and requires accurate knowledge of the Be half-life. To overcome these limitations, we applied an alternative chronometric technique, magnetostratigraphy, to a 50-mm-thick hydrogenetic ferromanganese crust (D96-m4) from the northwest Pacific. Submillimeter-scale magnetic stripes originating from approximately oppositely magnetized regions oriented parallel to bedding were clearly recognized on thin sections of the crust using a high-resolution magnetometry technique called scanning SQUID (superconducting quantum interference device) microscopy. By correlating the boundaries of the magnetic stripes with known geomagnetic reversals, we determined an average growth rate of 5.1 ± 0.2 mm/m.y., which is within 16% of that deduced from the Be/Be method (6.0 ± 0.2 mm/m.y.). This is the finest-scale magnetostratigraphic study of a geologic sample to date. Ultrafine-scale magnetostratigraphy using SQUID microscopy is a powerful new chronological tool for estimating ages and growth rates for hydrogenetic ferromanganese crusts. It provides chronological constraints with the accuracy promised by the astronomically calibrated magnetostratigraphic time scale (1-40 k.y.). © 2011 Geological Society of America.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=79951689946&origin=inward; http://dx.doi.org/10.1130/g31610.1; http://pubs.geoscienceworld.org/geology/article/39/3/227/130499/Ultrafinescale-magnetostratigraphy-of-marine; http://pubs.geoscienceworld.org/geology/article-pdf/39/3/227/3540306/227.pdf; http://geology.geoscienceworld.org/cgi/doi/10.1130/G31610.1; http://mr.crossref.org/iPage?doi=10.1130%2FG31610.1
Geological Society of America
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