A stable isotope study of serpentinization in the Fengtien ophiolite, Taiwan

Details A stable isotope study of serpentinization in the Fengtien ophiolite, Taiwan A stable isotope study of serpentinization in the Fengtien ophiolite, Taiwan

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1417y&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 54, Issue 5, pp.1417-1426

Computer Science

1

Scientific paper

Detailed H- and O-isotopic studies of serpentinites of Fengtien ophiolite have been made in order to enhance our knowledge on the process of serpentinization. Pseudomorphic lizardites have 18 O = +3.6%. and D = -48 to -49%.; bladed-mat and foliated antigorites have 18 O = +3.5 to +5.8%. and D = -45 to -69%.; slickensided antigorites have 18 O = +4.1 to +4.9%. and D = -46 to -50%.; picrolites have 18 O = +4.2 to +4.3%. and D = -65 to -67%.; and slickensided chrysotiles have 18 O = +4.1 to +4.5%. and D = -80%.. It is suggested that lizardite might have formed in an oceanic environment, whereas antigorite and chrysotile have formed in continental environments. These results depict complicated multiple serpentinization processes. Isotopic temperatures calculated using 18 O values of coexisting fissure-filling minerals range from 325 to 370°C, which are consistent with those derived from phase equilibria involving serpentines. The narrow range of 18 O and wide range of °D values for antigorite and chrysotile also demonstrate that water/rock ratios during these serpentinizations should not have been high. These Fengtien serpentines fall outside either of the "continental domains" described by Wenner and Taylor (1973, 1974); and fall within their "oceanic domain." We suggest that the domains proposed by Wenner and Taylor (1973, 1974) should be extended and that the terms, especially the "continental antigorite" and the "continental lizardite-chrysotile," should be purely occurrence-descriptive.

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