Trace-element constraints on accessory-phase saturation in evolved MORB magma

Details Trace-element constraints on accessory-phase saturation in evolved MORB magma Trace-element constraints on accessory-phase saturation in evolved MORB magma

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl.101..206d&link_type=abstract

Earth and Planetary Science Letters, Volume 101, Issue 2-4, p. 206-215.

Computer Science

5

Scientific paper

Despite the rarity or absence of ilmenite, apatite and zircon in MORB glasses, their relative ubiquity in ocean-floor and ophiolitic plutonic rocks indicates that they eventually crystallize in sufficiently evolved magma. We have inferred the following saturation sequence and conditions from experimental, geochemical and petrographic evidence for MOR basaltic glasses, gabbros and plagiogranites: (1) ilmenite crystallizes at 1100°C at the FMQ buffer from a liquid with about 4.0% TiO2 and 300 ppm Zr; (2) apatite crystallizes at 985°C from a liquid with about 0.7% P2O5, 600 ppm Zr, and 200 ppm Y; and (3) zircon crystallizes at about 840°C from a liquid with about 700 ppm Zr and (Na + K + 2Ca)/(Al * Si) = 2.4. We also show that interpretation of trace elements in whole-rock gabbros with a trapped liquid component may depend critically on whether they formed before or after crystallization of accessory phases. For an element that favors a particular accessory, the concentration in post-saturation gabbros may be inversely correlated with the degree of fractionation of the trapped liquid. Our data for TiO2 and Y in Oceanographer Fracture Zone gabbros illustrate this reversal of normal geochemical patterns for ilmenite and apatite, respectively.
Present address: Ebasco Services, Inc., 1 Oxford Valley, Langhorne, PA 19047, USA.

Affiliated with

Also associated with

No associations

Rating

Trace-element constraints on accessory-phase saturation in evolved MORB magma 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 Trace-element constraints on accessory-phase saturation in evolved MORB magma, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Trace-element constraints on accessory-phase saturation in evolved MORB magma will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1630142