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U.S. Geological Survey Open-File Report 03-221
A Pictorial Survey of the Bedrock Beneath Western Cape Cod, Massachusetts

Thin Section of 36MW1041

Photomicrograph of Basalt

Phyric basalt (36MW1041) showing altered plagioclase phenocrysts and relict euhedral olivine grains that are completely altered to chlorite in a plagioclase + clinopyroxene matrix.

Phyric basalt (36MW1041) showing altered plagioclase phenocrysts and relict euhedral olivine grains that are completely altered to chlorite in a plagioclase + clinopyroxene matrix.  Click here for a zip file with full resolution image.

chl: chlorite
cpx: clinopyroxene
pl: plagioclase

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