Variation in Degree of Hornblende Grain Alignment within two Boudinage Structures

Autor:	W. M. Schwerdtner, P. M. Sheehan, J. C. Rucklidge
Rok vydání:	1971
Předmět:	Orientation (vector space) Boudinage Goniometer engineering General Earth and Planetary Sciences Mineralogy engineering.material Variation (astronomy) Texture (geology) Geology Intensity (heat transfer) Degree (temperature) Hornblende
Zdroj:	Canadian Journal of Earth Sciences. 8:144-149
ISSN:	1480-3313 0008-4077
DOI:	10.1139/e71-010
Popis:	The degree of preferred orientation of hornblende in two boudinage structures is analyzed by means of an X-ray texture goniometer. Relative values of reflected intensity for {110} are plotted on the stereographic net, and contoured at convenient intervals. As in conventional fabric diagrams for hornblende, {110} define a great-circle girdle whose breadth reveals the density of unimodal grouping of [001].The density of grouping of [001] varies throughout both boudinage structures. It decreases with increasing extension in structure A, and seems to have a similar trend in structure B, where the determined variation in degree of grain alignment is of doubtful statistical significance.The inverse relationship between the degree of preferred orientation and the magnitude of extension may be attributed to rotation of the principal directions of finite strain during syntectonic crystallization. Alternatively, reorientation of strained grains by annealing recrystallization may have produced the inverse trend.
Databáze:	OpenAIRE
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