Lab 9 - 1 Lab 9 Part A: Metabasalts from Karamutsen The...

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1 Lab 9 Part A: Metabasalts from Karamutsen The Karamutsen Group of NE Vancouver Island, western Canada, consists of submarine basaltic rocks (tuffs, massive flows and pillow lavas). These rocks underwent low -grade burial metamorphism prior to the intrusion of Jurassic igneous rocks. The intrusive event resulted in the development of a thermal aureole within the Karamutsen Group. Figure 1 is a simplified map showing two contact metamorphic zones around one of the intrusives. In this lab, you are provided with six samples representing metabasalts that were not affected by contact metamorphism (but showing evidence of the earlier burial metamorphism), as well as those from the two contact metamorphic zones. Some of these samples are very fine-grained, so you must examine them under high power (40X!) in order to identify some of the minerals and textures. Keep in mind that some of these metabasalts are of very low-grade, so equilibrium was not attained on the scale of the thin section! You must therefore identify (or define) smaller domains where you think the minerals may have equilibrated. Keep in mind that metamorphism was isochemical throughout the area. 875: 1- List the minerals occurring in this sample. Be sure to identify the minerals that belong to the “peak” metamorphic conditions vs. relict minerals (inherited from the igneous protoliths). 2-
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This note was uploaded on 02/28/2012 for the course GLY 421 taught by Professor Staff during the Fall '11 term at Marshall.

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Lab 9 - 1 Lab 9 Part A: Metabasalts from Karamutsen The...

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