Geochemical fluxes related to alteration of a subaerially exposed seamount: Nintoku seamount, ODP Leg 197, Site 1205 - art. no. Q02014
|Author(s)||Revillon Sidonie1, 4, Teagle Damon A. H.1, Boulvais Philippe2, Shafer John3, Neal Clive R.3|
|Affiliation(s)||1 : Univ Southampton, Sch Ocean & Earth Sci, Natl Oceanog Ctr, Southampton SO14 3ZH, Hants, England.
2 : Univ Rennes 1, UMR 6118, F-35042 Rennes, France.
3 : Univ Notre Dame, Dept Civil Engn & Geol Sci, Notre Dame, IN 46556 USA.
|Source||Geophysic Geochemistry Geosystems - G3 (1525-2027) (American Geophysical Union), 2007-02 , Vol. 8 , P. NIL_62-NIL_87|
|WOS© Times Cited||8|
|Keyword(s)||Geochemistry : major and trace element geochemistry, Geochemistry : alteration and weathering processes, Geochemistry : geochemical cycles, Oceanic island, Isotope geochemistry, Chemical fluxes, Alteration, Hole 1205A, Ocean Drilling Program|
|Abstract||Hole 1205A was drilled on Nintoku Seamount, which lies in the midportion of the Emperor Seamount Chain. This seamount was emergent similar to 56 Myr ago but was submerged by 54 Ma, so the lavas have endured weathering in both subaerial and submarine environments. We have studied the petrology, mineralogy, and geochemistry of intercalated altered basalts, breccias, and soil samples recovered at Hole 1205A to quantify the chemical exchanges between the seamount and seawater and/ or meteoric fluids. The secondary mineralogy is relatively uniform throughout the section and comprises smectite, Feoxyhydroxides, iddingsite, and Ca-carbonates. Soils are composed of variably altered basaltic clasts in a matrix of kaolinite, smectite, and vermiculite with minor goethite, hematite, and magnetite. Throughout the basement section, altered basalts, breccias, and soils are depleted in Si, Mg, Ca, Na, Sr, Rb, and Ba and enriched in Fe. Fe3+/Fe-T (up to similar to 1), delta O-18 (up to similar to+20 parts per thousand), and Sr-87/Sr-86 ratios are strongly elevated relative to primary igneous values. Differences in the Sr-87/Sr-86 ratios define an Upper Alteration Zone with Sr-87/Sr-86 close to 56 Ma seawater (similar to 0.7077) from a Lower Alteration Zone where Sr-87/Sr-86 are less elevated (similar to 0.704). The Lower Alteration Zone likely reflects interaction with a subaerial oxidizing fluid at low temperature. This zone probably retained most of the original subaerial weathering signature. The Upper Alteration Zone was altered through circulation of large quantities of cold oxidizing seawater that partially overprinted the subaerial weathering chemical characteristics. Altered samples were compared to estimated protolith compositions to calculate chemical gains and losses. Global chemical fluxes are calculated for the entire basement section using different lithological proportions models and different rates of oceanic island emplacement. Although the global construction rate of ocean islands is small compared to igneous accretion at mid-ocean ridges, the magnitude of the chemical changes indicates that ocean islands and seamounts may be a significant contributor to the chemical budget of the oceans.|