Carbon isotope variations of CO2 in central Lau Basin basalts and ferrobasalts

Details Carbon isotope variations of CO2 in central Lau Basin basalts and ferrobasalts Carbon isotope variations of CO2 in central Lau Basin basalts and ferrobasalts

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.121..263m&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 121, no. 3/4, p. 263-276

Other

6

Basalt, Carbon Dioxide, Carbon Isotopes, Geochemistry, Magma, Ocean Bottom, Degassing, Dissolved Gases, Glass

Scientific paper

CO2 abundance and carbon isotopes data are reported for basalt glasses from three spreading centres in the Central Lau Basin. Abundances of CO2 dissolved in glasses vary from 9 ppm to 217 ppm with delta C-13 ranging from -16.4 per mill to -8.8 per mill. Evolved ferrobasalts from the propagating rift tip of the Central Lau Spreading Centre have both the lowest CO2 concentrations and delta C-13 values, while more magnesian basalts from the Intermediate and Eastern Lau Spreading Centres have higher CO2 abundances with higher and less variable delta C-13 values. Variations in abundance and carbon isotope ratios of dissolved CO2 can be modelled by degassing during eruption of melts originally containing 410-440 ppm CO2, with delta C-13 of -7.7 per mill, using a vapour-melt isotopt fractionation of 2.3 per mill. The type of degassing experienced by melts is related to their style of eruption, which is, in turn, governed by their eruption site. Central Lau Basin glasses, along with glasses from other marginal basins, display carbon isotope ratios which are lower than mid-ocean ridge basalts (MORB). While the variations within the suite are adequately described by various degrees of degassing, carbon isotope heterogeneity between sources of oceanic basalts can not be discounted. discounted.

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