Westerly Granite Geology

Samples deformed at lower temperatures and pressures show throughgoing faults.

Westerly granite geology.

The acoustic emission of westerly granite subjected to temperature changes up to 120 at various heating rates from 0 4 to 12 5 c min was studied. Khode island geology received some attention at a rather early date as the state was an area of early scientific development. Please call us at 401 377 2530 or. Of pennsylvanian age younger westerly granite and underlying igneous and metamorphic rocks of early paleozoic or precambrian age united states government printing office washington.

Narragansett pier granite and westerly granite which occur in both the hope valley and esmond dedham terranes the avalon superterrane of this report are here assigned to the narragansett plutonic suite new name. The geology of rhode island is based on nearly one billion year old igneous crystalline basement rocks formed as part of the microcontinent avalonia that collided with the supercontinent gondwana. Westerly granite a fine grained two mica granite from rhode island usa was chosen for the examination. Granite is a light colored igneous rock with grains large enough to be visible with the unaided eye.

Many investigations have been performed using this rock and its fundamental characteristics have been detailed by many researchers e g scholz 1968 friedmana et al 1970 tapponnier and brace 1976 chen and wang 1980. It forms from the slow crystallization of magma below earth s surface. Please note that comolli granite will be closed from aug 12 through aug 18 for vacations. Granite is composed mainly of quartz and feldspar with minor amounts of mica amphiboles and other minerals this mineral composition usually gives granite a red pink gray or white color with dark mineral.

The deformation behavior of quartz and feldspar has been studied in westerly granite deformed dry at a constant strain rate of 10 6 s confining pressures of 1 5 15 kbar and temperatures of 25 1000 c. A threshold temperature of 60 to 70 c appeared to exist for this range of heating rate above which a e. Westerly granite found between westerly and bradford is a pink to gray fine grained granite composed of glassy quartz black mica and feldspar. Those deformed at intermediate conditions show a combination of grain scale faults and plastic.