Progressive dissolution of titanomagnetites at ODP Site 653 (Tyrrhenian Sea)

Details Progressive dissolution of titanomagnetites at ODP Site 653 (Tyrrhenian Sea) Progressive dissolution of titanomagnetites at ODP Site 653 (Tyrrhenian Sea)

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl..96..469c&link_type=abstract

Earth and Planetary Science Letters, Volume 96, Issue 3-4, p. 469-480.

Physics

17

Scientific paper

Magnetic properties, microscopy and ferrous/ferric iron ratio document increasing down-core alteration of titanomagnetite to iron sulfide at ODP Site 653 (Leg 107, Tyrrhenian Sea). Changes in magnetic properties are interpreted to indicate a grain size increase in titanomagnetite to 40 m below seafloor (bsf) and a grain size decrease from this level to about 150 m bsf, as dissolution affects first the fine grained and then the coarser grained magnetite. The availability of dissolved sulfate from underlying Messinian evaporites may account for the sulfide supply at depth and hence for the prolonged dissolution process. Dissolution at Leg 107 sites adjacent to Site 653 is less pronounced, possibly by the availability of organic matter that can be metabolised by sulfate-reducing bacteria.

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