1
20
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https://geosciencecollections.milne-library.org/files/original/3b3e56d9ca105e0b279039211b85bf03.png
b4f98b0361b5d07e5d1a058caaa9a178
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
xpl / ppl
https://geosciencecollections.milne-library.org/files/original/d2fcaf97c629f8eaecc8524050a43343.JPG
fcc5902a23beefbd795c6662798f4dfe
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
DUCO-1 hand sample of red shale
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
(DUCO) Barrovian Metamorphic Sequence -- Dutchess County, New York
Contributor
An entity responsible for making contributions to the resource
Western Minerals, Inc.
Accrual Method
The method by which items are added to a collection.
Purchased from Western Minerals, Inc.
Description
An account of the resource
A classic example of Barrovian-type metamorphism in Dutchess County, NY associated with the Taconic orogeny. A Barrovian metamorphic sequence displays gradual pressure and temperature increase along the metamorphic gradient, and occurs during regional metamorphism. These zones of pressure and temperature increase are recognizable by the characteristic minerals that accompany them. Dutchess County, NY contains an unusually complete sequence.
This collection contains metamorphic rocks from chlorite grade to sillimanite grade in a tight spatial window which records the regional metamorphic gradient increasing from WNW to ESE. This collection also contains some rocks that mirror the protoliths of the schists and quartzites of the sequence (shales and graywacke).
Date
A point or period of time associated with an event in the lifecycle of the resource
1970
Spatial Coverage
Spatial characteristics of the resource.
Dutchess County, New York
Temporal Coverage
Temporal characteristics of the resource.
450-430 Ma
References
A related resource that is referenced, cited, or otherwise pointed to by the described resource.
<strong>Start Here:</strong> <br />Vollmer, F. W., and Walker, J., 2009, The classic Barrovian metamorphic sequence of Dutchess County and its structural and stratigraphic context in the Taconic Orogeny. In Guidebook—New York State Geological Association Meeting, v. 81, p. 11-1. <br /><a href="http://www2.newpaltz.edu/~vollmerf/papers/Vollmer_and_Walker_2009_NYSGA.pdf">http://www2.newpaltz.edu/~vollmerf/papers/Vollmer_and_Walker_2009_NYSGA.pdf</a> (accessed March 15th, 2015)<br /><br /><ul><li>A useful field trip guide across the Barrovian metamorphic sequence of Dutchess county. Good general introduction to the geology of the area.</li>
</ul><strong>Additional Resources:</strong><br />Whitney, D.L., Mechum, T.A., Keuhner, S.M., and Dilek, Y.R., 1996, Progressive metamorphism of pelitic rocks from protolith to granulite facies, Dutchess County, New York, USA: constraints on the timing of fluid infiltration during regional metamorphism, Journal of Metamorphic Geology, v. 14, p. 163-181. <a href="http://dx.doi.org/">http://dx.doi.org/<span>10.1046/j.1525-1314.1996.05836.x</span></a><br /><br /><ul><li>A fairly general look at the progressive metamorphism in Dutchess County by one of the foremost workers in the area.</li>
</ul><br />Knopf, E.B., 1927, Some recent work in the Taconic area: American Journal of Science, v. 41, p. 42-458. <a href="http://dx.doi.org/">http://dx.doi.org/<span>10.2475/ajs.s5-14.84.429</span></a><br /><br /><ul><li>One of the first articles to describle the Dutchess County rocks as a "classic" Barrovian sequence. </li>
</ul><br />Ghent, E.D., Stout, M.Z., 1981, Geobarometry and geothermometry of plagioclase-biotite-garnet-muscovite assemblages, Contributions to Mineralogy and Petrology, v. 76, p. 92-97. <a href="http://dx.doi.org/">http://dx.doi.org/<span>10.1007/BF00373688</span></a><br /><br /><br /><ul><li>Work constraining the pressure and temperature paths of metamorphism in the sequence through equilibrium assemblages. This work was found to be in agreement with other equilibrium assemblage PT paths.</li>
</ul><br />Whitney, D.L., Mechum, T.A., Dilek, Y.R., and Keuhner, S.M., 1996, Modification of garnet during regional metamorphism in garnet through sillimanite-zone rocks, Dutchess County, New York, American Mineralogist, v. 81, p. 696-705. <a href="http://www.minsocam.org/MSA/AmMin/TOC/Articles_Free/1996/Whitney_p696-705_96.pdf"> http://www.minsocam.org/MSA/AmMin/TOC/Articles_Free/1996/Whitney_p696-705_96.pdf</a><br /><br /><ul><li>Work by Whitney on changes in PTX conditions leading to modification of garnet in the metamorphic sequence. Garnet is widely distributed through the sequence, which makes it a useful marker for tracking these changes.</li>
</ul>
Rock
A physical material with a mineral composition.
Unit
Formation or other descriptive rock category
Barrovian Metamorphic Sequence
Number of Thin Sections
Number of thin sections associated with this sample
1
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Identifier
An unambiguous reference to the resource within a given context
DUCO-1
Title
A name given to the resource
Red shale
Spatial Coverage
Spatial characteristics of the resource.
Dutchess Co., NY
Contributor
An entity responsible for making contributions to the resource
Western Minerals
Is Part Of
A related resource in which the described resource is physically or logically included.
<a href="http://geosciencecollections.milne-library.org/collections/show/18">Barrovian Metamorphic Sequence--Dutchess County, New York</a>
Description
An account of the resource
Red shale from the Indian River member of the Normanskill formation. This rock contains hematite, chlorite, muscovite, plagioclase, and quartz.
The thin section shows muscovite and biotite with some larger quartz grains visible and minor hematite staining.
This rock is from the chlorite zone of the Barrovian metamorphic sequence (low metamorphism).
This rock was collected from the east end of a large road cut which samples 2 and 3 were also collected from.
Accrual Method
The method by which items are added to a collection.
Purchased from Western Minerals Inc.