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Published October 1, 1989 | public
Journal Article

Oxygen isotope and fluid inclusion study of the Mineral Point area, Eureka Graben, Colorado


Oxygen and hydrogen isotope studies have established that certain fractured, highly permeable volcanic piles have undergone extensive interaction with heated meteoric ground waters (Taylor, 1971, 1973, 1974a; Forester and Taylor, 1972, 1980). The western San Juan caldera complex in southwestern Colorado is an area where such regional hydrothermal activity took place in the late Tertiary. This paper details an oxygen isotope and fluid inclusion study of rocks and veins within the Eureka graben, which lies in the center of the complex (Fig. 1). Use of these two complementary tracers elucidates the nature of the hydrothermal fluids present during mineralization and places some constraints on the thermal regime of the hydrothermal system.

Additional Information

An Economic Geology reviewer improved the manuscript. Discussion with Teresa S. Bowers was helpful. The senior author was supported by a California Institute of Technology Summer Research Fellowship when research on this project began. Oxygen isotope analyses were supported by National Science Foundation grant EAR 83-13106 to Hugh P. Taylor, Jr. Fluid inclusion analyses were supported by National Science Foundation grant EAR 780334 to Maria Luisa Crawford. This is contribution 4743, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125.

Additional details

August 22, 2023
October 24, 2023