The problem, significance and implications for metamorphism of 60 million years of multiple phases of staurolite growth |
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| Authors: | I V Sanislav and A A Shah |
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| Institution: | (1) School of Earth Sciences, James Cook University, Townsville, Qld, 4811, Australia;(2) Present address: Department of Earth Science Education, Kyungpook National University, Daegu, 702-701 Kyungsangbuk-Do, Korea (south) |
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| Abstract: | Microstructural measurements of FIAs in staurolite reveal at least 3 periods of growth in the Proterozoic Colorado Front Range
and 5 in the Paleozoic Western Maine. Dated monazite inclusions in staurolite have an absolute age of 1760±12 Ma (FIA 1),
1720±7 Ma (FIA 2), 1682±18 Ma (FIA 3) in Colorado, and 408±10 Ma (FIA 2), 388±8 Ma (FIA 3), 372±6 Ma (FIA 4), 352±4 Ma (FIA
5) in Maine, supporting the multiple periods of deformation and metamorphism indicated by the FIA succession in each region.
Multiple phases of growth by similar reactions in the same as well as in diverse adjacent rocks in both regions suggest that
PT and X are not the only factors controlling the commencement and cessation of metamorphic reactions. The FIAs preserved
by the staurolite porphyroblasts indicate that the local partitioning of deformation at the scale of a porphyroblast was the
eventual controlling factor on whether or not the staurolite forming reactions took place. |
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