Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3211305f&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 11, CiteID L11305
Physics
5
Geochemistry: Composition Of The Mantle, Geochemistry: Magma Chamber Processes (3618), Geochemistry: Subduction Zone Processes (3060, 3613, 8170, 8413), Geochemistry: Stable Isotope Geochemistry (0454, 4870), Geochemistry: Mineral And Crystal Chemistry (3620)
Scientific paper
We present the first nitrogen (N) isotope measurements determined by in-vacuo crushing of mineral separates from arc lavas, OIBs (Ocean Island Basalts), and mantle xenoliths. Measured OIB δ15N values range from ~-8‰ for the northern rift zone in Iceland to +3.1‰ for a dunite nodule from Hawaii. Most arc-related olivines show distinctly positive values - up to +6.2‰ (Cerro Negro, Nicaragua). The measured N isotope values in olivine separates are similar to gas samples collected at the same localities, suggesting that both media (olivines and gases) sample volatiles primarily derived from the magma. This observation also implies that N isotope fractionation does not occur during magma degassing, a notion supported by 4He/40Ar* data. Our results indicate a heterogeneous mantle source region, in terms of N isotopic composition, that may have resulted from surface recycling of N at some localities.
Fischer Tobias P.
Hilton David R.
Sano Yuji
Sumino Hirochika
Takahata Naoto
No associations
LandOfFree
Nitrogen isotopes of the mantle: Insights from mineral separates 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 Nitrogen isotopes of the mantle: Insights from mineral separates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nitrogen isotopes of the mantle: Insights from mineral separates will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-874029