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Full-Text Articles in Physical Sciences and Mathematics
Geochemistry Of Hydrothermal Fluids From The Pacmanus, Northeast Pual And Vienna Woods Hydrothermal Fields, Manus Basin, Papua New Guinea, Eoghan P. Reeves, Jeffrey S. Seewald, Peter Saccocia, Wolfgang Bach, Paul R. Craddock, Wayne C. Shanks Iii, Sean P. Sylva, Emily Walsh, Thomas Pichler, Martin Rosner
Geochemistry Of Hydrothermal Fluids From The Pacmanus, Northeast Pual And Vienna Woods Hydrothermal Fields, Manus Basin, Papua New Guinea, Eoghan P. Reeves, Jeffrey S. Seewald, Peter Saccocia, Wolfgang Bach, Paul R. Craddock, Wayne C. Shanks Iii, Sean P. Sylva, Emily Walsh, Thomas Pichler, Martin Rosner
Geological Sciences Faculty Publications
Processes controlling the composition of seafloor hydrothermal fluids in silicic back-arc or near-arc crustal settings remain poorly constrained despite growing evidence for extensive magmatic–hydrothermal activity in such environments. We conducted a survey of vent fluid compositions from two contrasting sites in the Manus back-arc basin, Papua New Guinea, to examine the influence of variations in host rock composition and magmatic inputs (both a function of arc proximity) on hydrothermal fluid chemistry. Fluid samples were collected from felsic-hosted hydrothermal vent fields located on Pual Ridge (PACMANUS and Northeast (NE) Pual) near the active New Britain Arc and a basalt-hosted vent field …
Oxygen And Hydrogen Isotope Fractionation In Serpentine–Water And Talc–Water Systems From 250 To 450°C Mpa, Peter Saccocia, J. S. Seewald, W. C. Shanks Iii
Oxygen And Hydrogen Isotope Fractionation In Serpentine–Water And Talc–Water Systems From 250 To 450°C Mpa, Peter Saccocia, J. S. Seewald, W. C. Shanks Iii
Geological Sciences Faculty Publications
Oxygen and hydrogen isotope fractionation factors in the talc–water and serpentine–water systems have been determined by laboratory experiment from 250 to 450 °C at 50 MPa using the partial exchange technique. Talc was synthesized from brucite + quartz, resulting in nearly 100% exchange during reaction at 350 and 450 °C. For serpentine, D–H exchange was much more rapid than 18O–16O exchange when natural chrysotile fibers were employed in the initial charge. In experiments with lizardite as the starting charge, recrystallization to chrysotile enhanced the rate of 18O–16O exchange with the coexisting aqueous phase. Oxygen …
Hydrogen And Oxygen Isotope Fractionation Between Brucite And Aqueous Nacl Solutions From 250 To 450°C, Peter Saccocia, J. S. Seewald, W. C. Shanks Iii
Hydrogen And Oxygen Isotope Fractionation Between Brucite And Aqueous Nacl Solutions From 250 To 450°C, Peter Saccocia, J. S. Seewald, W. C. Shanks Iii
Geological Sciences Faculty Publications
Hydrogen and oxygen isotope fractionation factors between brucite and aqueous NaCl solutions (1000lnαbr-sw) have been calibrated by experiment from 250 to 450°C at 0.5 Kb. For D/H fractionation, 1000lnα br-sw values are as follows: −32 ± 6‰ (250°C, 3.2 wt% NaCl), −21 ± 2‰ (350°C, 10.0 wt% NaCl), and −22 ± 2‰ (450°C, 3.2 wt% NaCl), indicating that brucite is depleted in D relative to coexisting aqueous NaCl solutions. These results are in good agreement with previous D/H fractionation factors determined in the brucite-water system, indicating that any effects of dissolved salt on D/H fractionation are relatively small, …