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Enhanced 3He 4He ratios and cosmogenic helium in ultramafic xenoliths

Abstract:

Recently erupted ultramafic xenoliths generally have ratios of 3He 4He = (5-10) × RA, which are similar to the values characterizing mid-ocean ridge basalts (MORB). During the course of additional investigations of ultramafic xenoliths, samples from several locations have been found with 3He 4He ratios of either whole rock or mineral separates that are substantially higher than those found in MORB, up to over 400 × RA. These elevated ratios correspond to 3He excesses of between 8·10-14 and ...

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Authors


Porcelli, DR More by this author
Stone, JOH More by this author
O'Nions, RK More by this author
Journal:
Chemical Geology
Volume:
64
Issue:
1-2
Pages:
25-33
Publication date:
1987-08-25
DOI:
ISSN:
0009-2541
URN:
uuid:677f56d8-fd8e-4ca7-ac21-06c8fa19eb9a
Source identifiers:
165107
Local pid:
pubs:165107
Language:
English

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