Deformation of chlorite-mica aggregates in cleaved psammitic and pelitic rocks from Islesboro, Maine, U.S.A.
Document Type
Article
Publication Date
1986
Department
Department of Geological and Mining Engineering and Sciences
Abstract
Chlorite-white mica aggregates are large porphyroblasts found in weakly metamorphosed and deformed pelitic and psammitic rocks throughout the world. They are usually considered to originate either as detrital white mica layers surrounded by crystallized chlorite or as synkinematic porphyroblasts. In chlorite-muscovite aggregates observed at Islesboro, the chlorite layers were found to represent prekinematic porphyroblasts that have been strongly deformed and rotated during cleavage development. The muscovite layers in the aggregates formed by crystallization along split and dislocated (001) surfaces in the chlorite, or by alteration within intensely deformed sections of chlorite grains, such as kink-bands.
Publication Title
Journal of Structural Geology
Recommended Citation
Gregg, W.
(1986).
Deformation of chlorite-mica aggregates in cleaved psammitic and pelitic rocks from Islesboro, Maine, U.S.A..
Journal of Structural Geology,
8(1), 59-68.
http://doi.org/10.1016/0191-8141(86)90017-9
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/5621