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Assign each of the following rock groups to a metamorphic facies series based on

ID: 294703 • Letter: A

Question

Assign each of the following rock groups to a metamorphic facies series based on its mineral assemblages. Cite the mineral assemblages and specific minerals used for assigning to a facies series.

Group A
Rock 1: quartz - albite - laumontite - muscovite - chlorite
Rock 2: quartz - albite - epidote - muscovite - chlorite
Rock 3: quartz - plagioclase - muscovite - biotite - andalusite - staurolite Rock 4: quartz - plagioclase - alkali feldspar - biotite - sillimanite - garnet

Group B
Rock 1: quartz - albite - laumontite - muscovite - chlorite
Rock 2: quartz - albite - prehnite - muscovite - chlorite
Rock 3: quartz - albite - muscovite - chlorite - stilpnomelane - lawsonite Rock 4: quartz - white mica - lawsonite - jadeite pyroxene - glaucophane

Group C?
Rock 1: quartz - albite - wairakite - muscovite - chlorite
Rock 2: quartz - albite - epidote - muscovite - chlorite
Rock 3: quartz - plagioclase - muscovite - biotite - cordierite - garnet Rock 4: quartz - plagioclase - cordierite - hypersthene

Explanation / Answer

Group A
Rock 1: quartz - albite - laumontite - muscovite - chlorite - Ans - Greenschist facies
Rock 2: quartz - albite - epidote - muscovite - chlorite- Ans - Greenschist facies
Rock 3: quartz - plagioclase - muscovite - biotite - andalusite - staurolite -Ans-Hornblende-hornfels facies                 Rock 4: quartz - plagioclase - alkali feldspar - biotite - sillimanite - garnet -Ans-Amphibolite-facies

Group B
Rock 1: quartz - albite - laumontite - muscovite - chlorite-Ans - Greenschist facies
Rock 2: quartz - albite - prehnite - muscovite - chlorite-Ans - Greenschist facies
Rock 3: quartz - albite - muscovite - chlorite - stilpnomelane - lawsonite-Ans - Greenschist facies                                                         Rock 4: quartz - white mica - lawsonite - jadeite pyroxene - glaucophane - Ans -Blueschist facies

Group C?
Rock 1: quartz - albite - wairakite - muscovite - chlorite - Ans - Greenschist
Rock 2: quartz - albite - epidote - muscovite - chlorite - Ans - Greenschist
Rock 3: quartz - plagioclase - muscovite - biotite - cordierite - Garnet -Ans-Hornblende-hornfels facies                 Rock 4: quartz - plagioclase - cordierite - hypersthene - Ans-Hornblende-hornfels facies   

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