Preliminary Geologic Map of the Hamilton 30ʹ X 60ʹ Quadrangle 1996
Preliminary Geologic Map of the Hamilton 30ʹ X 60ʹ Quadrangle 1996
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Thin, interbedded, fine- grained clastic layers have been metamorphosed into biotite-muscovite-quartz-feldspar schist, with foliation parallel to original bedding. This unit appears to conformably underlie the middle Belt carbonate unit and is therefore part of the Ravalli Group, perhaps correlative with the Revett Formation.
Ybm GNEISSIC METASEDIMENTARY ROCKS, UNDIVIDED (MIDDLE PROTEROZOIC) Mostly migmatitc quartzofeldspathic gneiss with lesser amounts of calc-silicate gneiss, pelitic schist, ...and amphibolite. These are probably higher grade metamorphic equivalents of the Belt Supergroup rocks described above (Ymi, Yc, and Yq). Age of amphibolite grade metamorphism is uncertain.
Ycg CALC-SILICATE GNEISS (MIDDLE PROTEROZOIC) Banded gray to green gneiss consisting of light green layers of diopside, quartz, and actinolite alternating with light gray layers of quartz, feldspar, and biotite. Scapolite is common as large (up to 0.5 cm) white porphyroblasts. This unit is a higher grade metamorphic equivalent of Yc and may be gradational with Yc.
What to read after Preliminary Geologic Map of the Hamilton 30ʹ X 60ʹ Quadrangle 1996?
You can find similar books in the "Read Also" column, or choose other free books by Montana Bureau of Mines And Geology to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Thin, interbedded, fine- grained clastic layers have been metamorphosed into biotite-muscovite-quartz-feldspar schist, with foliation parallel to original bedding. This unit appears to conformably underlie the middle Belt carbonate unit and is therefore part of the Ravalli Group, perhaps correlative with the Revett Formation.
Ybm GNEISSIC METASEDIMENTARY ROCKS, UNDIVIDED (MIDDLE PROTEROZOIC) Mostly migmatitc quartzofeldspathic gneiss with lesser amounts of calc-silicate gneiss, pelitic schist, ...and amphibolite. These are probably higher grade metamorphic equivalents of the Belt Supergroup rocks described above (Ymi, Yc, and Yq). Age of amphibolite grade metamorphism is uncertain.
Ycg CALC-SILICATE GNEISS (MIDDLE PROTEROZOIC) Banded gray to green gneiss consisting of light green layers of diopside, quartz, and actinolite alternating with light gray layers of quartz, feldspar, and biotite. Scapolite is common as large (up to 0.5 cm) white porphyroblasts. This unit is a higher grade metamorphic equivalent of Yc and may be gradational with Yc.
What to read after Preliminary Geologic Map of the Hamilton 30ʹ X 60ʹ Quadrangle 1996?
You can find similar books in the "Read Also" column, or choose other free books by Montana Bureau of Mines And Geology to read onlineMoreLess
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