The Resource Unraveling the fluid-present metamorphism of schists from garnet compositions in the Black Hills, South Dakota, by Yanying Chen

Unraveling the fluid-present metamorphism of schists from garnet compositions in the Black Hills, South Dakota, by Yanying Chen

Label
Unraveling the fluid-present metamorphism of schists from garnet compositions in the Black Hills, South Dakota
Title
Unraveling the fluid-present metamorphism of schists from garnet compositions in the Black Hills, South Dakota
Statement of responsibility
by Yanying Chen
Creator
Contributor
Author
Thesis advisor
Subject
Genre
Language
eng
Summary
Garnets in Proterozoic metapelites in the Black Hills, South Dakota, were analyzed to determine their pressure, temperature and hydrothermal conditions of growth and to elucidate pressure-temperature-time paths of their host rocks. The metapelites are the product of garnet-grade regional metamorphism due to the collision of Wyoming and Superior cratons and subsequent contact metamorphism by intrusion of the Harney Peak Granite. X-ray element maps and compositional profiles across garnets were determined using electron-probe microanalysis. Mineral assemblage diagrams (pseudosections) with garnet composition contours were constructed using the THERIAK-DOMINO software and then the P-T-t paths can be derived. Results show that internal chemical diffusion would have been too slow for modification of garnet chemistry after crystallization. Thus, the chemical zoning must reflect conditions during garnet growth. In the garnet and staurolite zones, garnets initially grew in a low a(H2O) environment and the temperature of initial growth may have overstepped the equilibrium temperature. In the sillimanite zone, low-grade garnet partially or fully recrystallized in a higher a(H2O) environment and compositions suggest equilibrium growth commensurate with sillimanite-grade temperatures. Garnet compositions suggest that the early regional metamorphism occurred at relatively low pressures (3̃ kbar), whereas the region in close proximity to the Harney Peak Granite had a high-P history (>6 kbar) that is supported by an occurrence of kyanite in one sillimanite-zone sample
Cataloging source
MUU
http://library.link/vocab/creatorName
Chen, Yanying
Degree
M.S.
Dissertation note
Thesis
Dissertation year
2012.
Government publication
government publication of a state province territory dependency etc
Granting institution
University of Missouri--Columbia,
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • theses
http://library.link/vocab/relatedWorkOrContributorName
Nabelek, Peter Igor
http://library.link/vocab/subjectName
  • United States
  • Garnet
  • Proterozoic Geologic Period
  • Cratons
  • Metamorphism (Geology)
  • Electron probe microanalysis
  • Crystallization
Label
Unraveling the fluid-present metamorphism of schists from garnet compositions in the Black Hills, South Dakota, by Yanying Chen
Instantiates
Publication
Note
Advisor: Peter Igor Nabelek
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
876614983
Extent
1 online resource (ix, 79 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (some color)
Specific material designation
remote
System control number
(OCoLC)876614983
Label
Unraveling the fluid-present metamorphism of schists from garnet compositions in the Black Hills, South Dakota, by Yanying Chen
Publication
Note
Advisor: Peter Igor Nabelek
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
876614983
Extent
1 online resource (ix, 79 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (some color)
Specific material designation
remote
System control number
(OCoLC)876614983

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