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Time scales of porphyry Cu deposit formation: insights from titanium diffusion in quartz

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Celestine N. Mercer, Mark H. Reed, and Cameron M. Mercer, 2015, Time scales of porphyry Cu deposit formation: insights from titanium diffusion in quartz: Economic Geology, v. 110, iss. 3.

Summary

Porphyry dikes and hydrothermal veins from the porphyry Cu-Mo deposit at Butte, Montana, contain multiple generations of quartz that are distinct in scanning electron microscope-cathodoluminescence (SEM-CL) images and in Ti concentrations. A comparison of microprobe trace element profiles and maps to SEM-CL images shows that the concentration of Ti in quartz correlates positively with CL brightness but Al, K, and Fe do not. After calibrating CL brightness in relation to Ti concentration, we use the brightness gradient between different quartz generations as a proxy for Ti gradients that we model to determine time scales of quartz formation and cooling. Model results indicate that time scales of porphyry magma residence are ~1,000s [...]

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Harvested on Tue Mar 31 04:26:08 MDT 2015 from MODS XML Service

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Type Scheme Key
local-index unknown 70142152
local-pk unknown 70142152
doi http://www.loc.gov/standards/mods/mods-outline-3-5.html#identifier doi:10.2113/econgeo.110.3.587
series unknown Economic Geology

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journalEconomic Geology
parts
typevolume
value110
typeissue
value3
languageEnglish
citationTypeArticle

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