Boron metasomatism of the Alta stock contact aureole, Utah: Evidence from borates, mineral chemistry, and geochemistry
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Darrell T. Woodford
,
Virginia B. Sisson
Abstract
Geochemical study of the Alta stock and adjacent contact aureole rocks provides information concerning the source, composition, and physical-chemical conditions of infiltrating fluids. Special emphasis was given to boron (B) as a tracer of fluid-rock interactions due to the occurrence of borate minerals (ludwigite, kotoite, and szaibelyite) in skarn deposits around the stock. In addition, thin section alpha-track mapping implies significant B enrichments in fluid-altered minerals within the stock, stockwork veins and related selvages, igneous sills near the stock, contact skarns, and in marbles up to 500 m from the stock. Forsterite, clinohumite, lizardite, and malachite contain between 50 and 1200 ppm B. Diopside, calcite, clintonite, phlogopite, brucite, hedenbergite, tremolite, and other minerals host B to a lesser extent. Aureole B enrichments correlate well with major and other trace-element enrichments, and support existing models of element transport in magmatic fluids with lateral down-temperature flow. Large variations in mineral B concentrations reflect changes in B concentrations of these fluids through time. Mass-balance calculations indicate that magmatic fluids emanating from the Alta pluton could supply most B in the Alta aureole. It is estimated that the emplaced magma had an initial B concentration between 7-10 ppm; indicated exhalative losses of B from the pluton are on the order of 50%. We estimate that the exsolved fluids had a time-integrated B concentration of 160 ± 40 ppm, although much higher concentrations may have attended local borate mineralization.
© 2015 by Walter de Gruyter Berlin/Boston
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- Biodurability of talc
- Microbial biomineralization in weathered volcanic ash deposit and formation of biogenic minerals by experimental incubation
- In situ atomic force microscopy study of hectorite and nontronite dissolution: Implications for phyllosilicate edge surface structures and dissolution mechanisms
- Na- and Cs-exchange in a clinoptilolite-rich rock: Analysis of the outgoing cations in solution
- The effects of time, temperature, and concentration on Sr2+ exchange in clinoptilolite in aqueous solutions
- Thermodynamics of ion-exchanged and natural clinoptilolite
- Thermochemical study of calcium zeolites–heulandite and stilbite
- Fe3+/ΣFe vs. FeLα peak energy for minerals and glasses: Recent advances with the electron microprobe
- Fibrous nanoinclusions in massive rose quartz: The origin of rose coloration
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