Discrete plumbing systems and heterogeneous magma sources of a 24 km3 off-axis lava field on the western flank of East Pacific Rise, 14 °S.

Mathematics – Logic

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

4

Scientific paper

The largest known mid-ocean-ridge off-axis lava flow field occurs slightly off-axis near 14 °S along the East Pacific Rise (EPR). It comprises at least four volcanologically discrete units. We collected lava samples from 24 sites within the off-axis lava field and 7 sites on the adjacent ridge crest using the Shinkai-6500 submersible. The lava field comprises at least three distinct MORB compositions, all of which are different from the lavas collected from the nearby ridge axis. The east and west cones and the northern lobe of the lava field consist of normal MORB (N-MORB) lavas with a low concentration of incompatible elements and low LILE/HFSE and LREE/HREE ratios. By contrast, the samples from the west plain of the field have a higher concentration of incompatible elements and higher LILE/HFSE and LREE/HREE ratios indicating T-MORB character. The lava samples collected from the summit of the east cone show the highest concentration of LILE elements and LREEs among the lava field (E-MORB lava). The N-MORB of the off-axis lava field are more depleted in incompatible elements than the adjacent EPR axis lavas, possibly reflecting the re-melting of the residual mantle in the off-axis region. The E-MORB lava was probably derived from fertile mantle that did not undergo melting beneath the spreading center. T-MORB, which occupies the main part of the 14 °S lava field, is the product of magma mixing between N-MORB and E-MORB magmas.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Discrete plumbing systems and heterogeneous magma sources of a 24 km3 off-axis lava field on the western flank of East Pacific Rise, 14 °S. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Discrete plumbing systems and heterogeneous magma sources of a 24 km3 off-axis lava field on the western flank of East Pacific Rise, 14 °S., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discrete plumbing systems and heterogeneous magma sources of a 24 km3 off-axis lava field on the western flank of East Pacific Rise, 14 °S. will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-878675

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.