The northern limit of the North Atlantic high-H2O mantle province

Details The northern limit of the North Atlantic high-H2O mantle province The northern limit of the North Atlantic high-H2O mantle province

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....13298m&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #13298

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Scientific paper

The H_2O that is dissolved in submarine basalt glasses can provide information about the H_2O content of the upper mantle. In the mantle that produces mid-ocean ridge basalts (MORB) and ocean island basalts (OIB), the relative incompatibility of H_2O is approximately like that of Cerium (Ce). H_2O/Ce is fairly constant for depleted and enriched MORB (N-MORB and E-MORB) from a given region, but there are interesting regional differences. The most distinctive regional variation of H_2O/Ce was found on the Mid-Atlantic Ridge, from around 35^oN to as far north as was previously sampled: 77^oN (Michael, 1995). Both N-MORB and E-MORB from this region have significantly higher H_2O/Ce compared to MORB and OIB from the rest of the globe: 210--350 versus 120--230. Here we report the discovery of the northern boundary of this high-H_2O province, on Gakkel Ridge in the high Arctic. MORB glasses were collected from over 1000 km of Gakkel Ridge during the Arctic Mid-ocean Ridge Expedition (AMORE 2001). H_2O/Ce declines from values typical of the northern MAR (310--360) at the western end (8^oW) of Gakkel Ridge to values typical of the rest of the globe by 60^oE on Gakkel Ridge (170--220). High H_2O/Ce coincides with enrichment in other incompatible trace elements, notably Ba (see Langmuir et al., this meeting). The fact that the western part of the Gakkel Ridge has MORB with high H_2O/Ce suggests that its mantle source shares some characteristics with North Atlantic mantle, and that they may have a similar history. The high-H_2O/Ce could reflect the influence of ancient subduction processes that might have affected this large region (Michael, 1995). Relatively high H_2O could also have an important influence on mantle melting, especially at the low extents of melting that characterize Gakkel Ridge. Michael, P.J., 1995, Earth Planet. Sci. Lett. 131, 301-320.

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