An Isograd and Mixed-Volatile Exercise Using Data from the Ubehebe Peak Contact Aureole
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This page first made public: Jul 17, 2008
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Description of the activity/assignment
Note that mapped assemblages have been somewhat simplified from the field data (Roselle 1997). Where brucite was observed in the aureole it has been mapped as periclase. All of the assemblages are '3-phase' except for the mapped assemblages of Dol+ Qtz+ Cal+ Tr. This assemblage can be the focus of a question regarding crossing tie-lines and the 'quartz-out' isograd. To simplify the exercise the open triangle symbols can be filled, making the assemblage Dol+ Cal+ Tr. Any of the questions below can be made a bit more straightforward by including more guiding text (or the reverse), depending on the preparation of the students.
The Ubehebe aureole is an excellent locality to use to teach metamorphic reactions in siliceous dolomites (Peck, 2003), and has the advantage of the availability of supplementary data for other exercises (mineral textures, Roselle, 1997; Roselle et al., 1997; stable isotopes, Roselle et al., 1999; remote sensing, Kozak et al., 2004). Ubehebe is also a case study discussed in Best's Igneous and Metamorphic Petrology (2003). Winter's (2001) textbook discusses the Alta contact aureole. A similar problem set could be easily made by using data from Alta (Cook and Bowman, 2000).
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- Activity Description/Assignment (Microsoft Word 27kB Jan16 04)
- Instructors Notes (Microsoft Word 29kB Jan16 04)
- Solution Set (Acrobat (PDF) 287kB Jan16 04)