Prograde amphibole dehydration reactions during high-grade regional metamorphism, central Massachusetts, USA
Journal Article
·
· American Mineralogist; (United States)
OSTI ID:5738609
- Union College, Schenectady, NY (United States)
The study area extends for 80 km through regionally metamorphosed rocks in the metamorphic high of southern New England, in which Acadian (Devonian) metamorphism ranged from sillimanite-muscovite grade through sillimanite-garnet-cordierite-orthoclase grade. Over this metamorphic interval, amphibolites containing the assemblages plagioclase + hornblende {plus minus} quartz {plus minus} cummingtonite {plus minus} orthoamphibole {plus minus} garnet were transformed by a series of reactions into pyroxene granulites with assemblages of plagioclase + orthopyroxene + augite {plus minus} quartz {plus minus} hornblende {plus minus} garnet. Three particularly important reactions were examined in detail. These reactions, along with others, define an assemblage series in quartz-bearing rocks in the transition from amphibolite facies to granulite facies. This assemblage series is based on the coexistence of diagnostic minerals in common mafic rocks with increasing grade. This transition is estimated to have occurred over a temperature interval of 580-730C.
- OSTI ID:
- 5738609
- Journal Information:
- American Mineralogist; (United States), Journal Name: American Mineralogist; (United States) Vol. 76:5-6; ISSN AMMIA; ISSN 0003-004X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
580000* -- Geosciences
AMPHIBOLE
ANORTHOSITES
DEHYDRATION
DEVONIAN PERIOD
GABBROS
GARNETS
GEOLOGIC AGES
GEOLOGIC FORMATIONS
GEOLOGIC HISTORY
HORNBLENDE
IGNEOUS ROCKS
MASSACHUSETTS
METAMORPHIC ROCKS
METAMORPHISM
MICA
MINERALS
MUSCOVITE
OXIDE MINERALS
OXYGEN COMPOUNDS
PALEOZOIC ERA
PLUTONIC ROCKS
PYROXENES
QUARTZ
RESERVOIR TEMPERATURE
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
580000* -- Geosciences
AMPHIBOLE
ANORTHOSITES
DEHYDRATION
DEVONIAN PERIOD
GABBROS
GARNETS
GEOLOGIC AGES
GEOLOGIC FORMATIONS
GEOLOGIC HISTORY
HORNBLENDE
IGNEOUS ROCKS
MASSACHUSETTS
METAMORPHIC ROCKS
METAMORPHISM
MICA
MINERALS
MUSCOVITE
OXIDE MINERALS
OXYGEN COMPOUNDS
PALEOZOIC ERA
PLUTONIC ROCKS
PYROXENES
QUARTZ
RESERVOIR TEMPERATURE
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS