WEBThe Spruce Pine area of Mitchell, Avery, and Yancey counties, North Carolina (Figure 1), contains thousands of Silurian-Devonian pegmatites and associated granitoid intrusions with economically valuable industrial minerals (Brobst, 1962; McSween et al., 1991).
Geology of the Spruce Pine district, Avery, Mitchell, and Yancey ...
WEBThe Spruce Pine pegmatite district, a northeastward-trending belt 25 miles long and 10 miles wide, lies in parts of Avery, Mitchell, and Yancey Counties in the Blue Ridge Province of western North Carolina.
Spruce Pine Mining District - Wikipedia
WEBThe pegmatites and country rock are part of the Spruce Pine thrust block, the highest thrust sheet of the Blue Ridge belt, the latter being part of the Tugaloo Terrane which was accreted to North America during the Taconic Orogeny. [2]
(PDF) Mineralogy and petrogenesis of pegmatites in the Spruce Pine …
WEBJan 1, 2010 · Granitic rocks (mainly granodiorites) of the Spruce Pine Plutonic Suite occur as small plutons and numerous pegmatite bodies intruded into amphibolite-grade schists and gneisses of the Ashe...
The Spruce Pine Pegmatite Mining District - bo-smith.net
WEBSpruce Pine Pegmatite (smokey quartz, feldspar, and mica) Introduction: The Spruce Pine Pegmatite consists of a valuable source of high quality quartz, feldspar, and mica as well as associated gem minerals.
Petrogenesis of the Spruce Pine pegmatites, North Carolina
WEBPegmatites in the Spruce Pine district, North Carolina, are an example of muscovite class pegmatites that were derived from differentiation of a magma. There are eight granodiorite plutons in the Spruce Pine area ranging in size from 1 to 20 square kilometers that contain and are surrounded by hundreds of pegmatites.
WEBThe Blue Ridge structural province of North Carolina and adjoining Tennessee is composed of a great, three-dimensional mass of defonned and metamorphosed rocks. The province is bounded on the west by major thrust faults, and on the east by the Brevard zone (figure 1).
WEBThe Spruce Pine pegmatite district, the largest domestic source of feldspar and sheet mica, lies in parts of Avery, Mitchell, and Yancey Counties in the Blue Ridge province of western North Carolina.
WEBPegmatite found in the Spruce Pine Mining District of North Carolina is fairly rich in minerals. Spruce Pines rare geological properties are the result of a continental collision about 380 million years ago and 100 million years of slowly cooling intrusive magma settled deep within the earth.
The pegmatites of the Spruce Pine District, North Carolina
WEBThe pegmatites of the Spruce Pine District, North Carolina. Several types of pegmatites are distributed in zones, thought to reflect differences in temperature of formation. In general, plagioclase predominates over microcline, and crystallized first; the amount of microcline varies with the composition of the plagioclase.Abundant structures ...
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