Metals and isotopes in Juan de Fuca Ridge hydrothermal fluids and their associated solid materials

Journal Article · Sat Oct 10 00:00:00 EDT 1987 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JB092iB11p11400· OSTI ID:5719973

Hinkley, T K; Tatsumoto, M

The /sup 87/Sr//sup 86/Sr ratio of the hydrothermal solution (HTS) (0.7034) is larger than that of basalt (0.7025) at the southern vent field of the Juan de Fuca Ridge (SJFR). Both the Sr isotopic ratio for HTS and the water/rock interaction ratio lie between those at two sites farther south on the East Pacific Rise, 13 /sup 0/N and 21 /sup 0/N. These parameters may be closely related to subsurface temperatures and rates of magma ascent and to extent of faulting and surface areas of the frameworks of the hydrothermal systems. For these three Pacific Ocean sites there is no steady geographical progression of these measured parameters, nor of reported spreading rate, with increasing latitude northward. Pb and Nd isotopic measurements are uniform for all samples from the SJFR, ranging only from 18.43 to 18.58 for /sup 206/Pb//sup 204/Pb (fluids and associated solids) and centering near 0.5131 for /sup 143/Nd//sup 144/Nd (only fluids measured). Values for basalts and sulfides from the site have similar values. Relatively high /sup 206/Pb//sup 204/Pb values at the SJFR suggest the potential for the existence of an anomalous radiogenic heat source in the underlying mantle material.

• Research Organization: U.S. Geological Survey, Denver, Colorado
• OSTI ID: 5719973
• Journal Information: J. Geophys. Res.; (United States), Vol. 92:B11
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
GEOTHERMAL FLUIDS
ISOTOPE RATIO
PACIFIC OCEAN
VENTS
HYDROTHERMAL ALTERATION
LEAD ISOTOPES
MAGMA
NEODYMIUM ISOTOPES
PRECIPITATION
SEA-FLOOR SPREADING
SEAWATER
STRONTIUM ISOTOPES
ALKALINE EARTH ISOTOPES
FLUIDS
HYDROGEN COMPOUNDS
ISOTOPES
OXYGEN COMPOUNDS
SEAS
SEPARATION PROCESSES
SURFACE WATERS
WATER
152004* - Geothermal Data & Theory- Isotope & Trace Element Studies