Seawater-peridotite interaction at 300°C and 500 bars: implications for the origin of oceanic serpentinites

Details Seawater-peridotite interaction at 300°C and 500 bars: implications for the origin of oceanic serpentinites Seawater-peridotite interaction at 300°C and 500 bars: implications for the origin of oceanic serpentinites

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44..309d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 44, Issue 2, pp.309-321

Computer Science

5

Scientific paper

An experiment has been performed reacting seawater with fresh peridotite (80% olivine, Fo 90 and ~- 15% enstatitic orthopyroxene En 95 and minor clinopyroxene and spinel) at 300°C, 500 bars and water/rock mass ratio of 20. The duration of the experiment was approximately 1500 hr. Seawater chemistry was appreciably modified during the experiment. Mg, Ca, Sr, SO 4 and H 2 O were removed, while H 2 S (aq) , Fe, Mn and Zn were added. H 2 S (aq) resulted from the inorganic reduction of seawater SO 4 . pH was initially acid (2.8), but then rose slowly to a value of 5.2. The aqueous concentrations of Na, K, Cl and boron (B) changed little from that in seawater prior to reaction. However, as the solution was cooled to room temperature at the end of the experiment, the B concentration decreased. This suggests that the B content of oceanic serpentinites may be the result of retrograde reactions between a previously serpentinized body and `cold' seawater. The primary minerals in the peridotite were replaced to varying degrees by serpentine (lizardite), magnetite. Mg-hydroxysulfate, anhydrite and possibly pyrite and sphalerite. Mg-hydroxysulfate and much anhydrite dissolved on quench. The alteration mineral assemblage generated during this experiment is consistent with that predicted from equilibrium phase relations and is similar in chemical composition, mineralogy and paragenesis to that reported for oceanic serpentinites.

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