Garnet zoning from the Devonian Littleton Formation, north-central Massachusetts, USA

Kim, Hyeong Soo (2001) Garnet zoning from the Devonian Littleton Formation, north-central Massachusetts, USA. Journal of the Mineralogical Society of Korea, 14. pp. 1-11.

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Compositional zoning patterns of garnet porphyroblast in kyanite-staurolite-garnet bearing sample from the Devonian Littleton Formation. north-central Massachusetts, reveal complex growth patterns_ Garnet porphyroblast exhibits asymmetric and irregular zoning patterns in Mn, Mg and Ca. The composition of the garnet at the textural boundaries is different for different traverses. and zoning reversals in XMn and Fe/(Fe+Mg) are coincident with development of inclusion trails within the porphyroblast. These observations suggest that the garnet zoning was not only modiljed from garnet-consuming reactions, but also influenced by pre-existing microfabrics through the effects of dissolution and precipitation. Relationships between chemical and textural truncations and garnet growth model proposed in this paper indicate that the zoning patterns of garnet were controlled by preferential dissolution and precipitation during the development of successive foliations that occurred in zones of shearing (high strain/stress) and zones of shortening (low strain/stress).

Item ID: 13286
Item Type: Article (Research - C1)
ISSN: 1225-309X
Keywords: dissolution; garnet; porphyroblasts; precipitation; zoning reversal
Date Deposited: 23 Dec 2010 23:50
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040304 Igneous and Metamorphic Petrology @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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