Download or read book Metamorphic and Deformational History of Archean Migmatites and Gneisses Central Horseshoe Lake Quadrangle Wind River Mountains Wyoming written by James V. Hengesh and published by . This book was released on 1987 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metamorphic and Deformational History of Archean Migmatties and Gneisses Central Horseshoe Lake Quadrangle Wind River Mountains Wyoming written by James V. Hengesh and published by . This book was released on 1987 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Grade Regional Metamorphism of Precambrian Gneisses and Associated Rocks Paradise Basin Quadrangle Wind River Mountains Wyoming written by Kenneth Perry and published by . This book was released on 1965* with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Taconite and Migmatite in the Northern Wind River Mountains Fremont Sublette and Teton Counties Wyoming written by Ronald G. Worl and published by . This book was released on 1968 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metamorphism and Tectonics of Eastern and Central North America written by and published by . This book was released on 1989 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metamorphic and Structural Evolution of Archean Rocks in the Keskarrah Bay Area Point Lake District of Mackenzie N W T written by Valerie A. Jackson and published by . This book was released on 1989 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metamorphic Evolution of the Archean Pony Middle Mountain Metamorphic Suite Tobacco Root Mountains Southwestern Montana written by Karl William Wegmann and published by . This book was released on 1996 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book On the Archean High grade Metamorphic Rocks in the Varpaisj rvi Area Central Finland written by Jorma Paavola and published by . This book was released on 1984 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metamorphism and Deformational History of a Portion Portion of the Campbell Mountain and Suches 7 1 2 minute Quadrangles Northern Georgia written by Nathan Daniel Heinrich and published by . This book was released on 1987 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Migmatites Melting and Metamorphism written by Michael Patrick Atherton and published by . This book was released on 1983 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Neoarchean Metamorphism and Metasomatism During Crustal Assembly of the Southern Wyoming Province written by Stephanie A. Vincent and published by . This book was released on 2017 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: Black Rock Mountain in central Wyoming exposes Paleoarchean to Neoarchean rocks of the Wyoming Province that preserve petrographic, geochemical, geothermobarometric, and geochronological information critical to understanding the processes by which terranes were formed and accreted to the southern Wyoming Province in Neoarchean time. Black Rock Mountain lies at the eastern end of the Sacawee Block, an area of Paleo- to Mesoarchean basement along the southern margin of the Beartooth Bighorn Magmatic Zone. Terranes of juvenile and evolved supracrustal rocks are interpreted to have been accreted to the Sacawee Block at ~2.65-2.63 Ga, prior to the intrusion of the undeformed Wyoming batholith at 2.62 Ga. Black Rock Mountain contains a complex series of rock packages separated by NE-SW trending, steeply-dipping shear zones. On the west end of the mountain, the ~2.86-2.83 Ga metasedimentary Barlow Gap Group is in depositional contact with the ~3.3 Ga Sacawee orthogneiss. Detrital zircon U-Pb ages from a quartzite between 2.91-3.66 Ga supports this previously determined depositional age. Metadacite and metabasalt and a biotite-rich unit with abundant enclaves of ~3.3 Ga orthogneiss exposed in the central part of the mountain are also interpreted to be part of the Barlow Gap Group. Interlayered metapelites and metagabbros are exposed on either side of this central metavolcanic unit, separated by shear zones. Their age is unconstrained. The ~3.4 Ga UC Ranch orthogneiss is exposed on the furthest east end of the mountain, and is separated from the adjacent metapelite and metagabbro package by a NE-SW trending shear zone. The interpretation of this study is that Black Rock Mountain contains several blocks of contrasting lithologies that were tectonically interleaved during Neoarchean deformation along the southern margin of the Wyoming Province. Metamorphism is amphibolite-grade with a staurolite-garnet-biotite schist recording pressures and temperatures of 3.8-4.5 kbar and 590-595°C and an andalusite-biotite-chlorite schist recording pressures and temperatures of 2-3 kbar and 520-580°C. An Fe-rich amphibolite records a similar temperature and higher pressure of 7.1 kbar. The large uncertainty on the pressure determination precludes the determination whether there are one or more metamorphic events recorded at Black Rock Mountain. U-Pb dating of monazite from micaceous schists, interpreted as formed by greenschist facies metasomatism, establishes a previously unrecognized fluid flow event at ~2.60 Ga. This event post-dates the intrusion of the 2.62 Ga Wyoming batholith, and appears to record the final Archean metamorphism in the Wyoming Province.

Download or read book High Grade Metamorphism and Partial Melting in the Bluegrass Creek Suite Central Laramie Mountains Wyoming written by Michael Joseph Spicuzza and published by . This book was released on 1990 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metamorphic and Deformational History Within the Martic Shear Zone Unionville and Coatesville Quadrangles Southeastern Pennsylvania written by Bruce Read Cushing and published by . This book was released on 1988 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geochemisty and Geochronology of Archean Metamorphic Rocks of the Eastern Beartooth Mountains Montana and Wyoming written by David Kevin Hunt and published by . This book was released on 1979 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Regional Metamorphism in the Condrey Mountain Quadrangle North central Klamath Mountains California written by Preston Enslow Hotz and published by . This book was released on 1979 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structural metamorphic and geochronologic constraints on the origin of the Condrey Mountain schist North Central Klamath Mountains Northern California written by Mark Alan Helper and published by . This book was released on 1985 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Condrey Mountain Schist (CMS) occupies a window through Late Triassic amphibolite facies melange in the north central Klamath Mountains in northern California and southwest Oregon. The schists owe their present level of exposure to a large structural dome centered on the Condrey Mountain Window. Transitional blueschist-greenschist facies assemblages are widespread in mafic schists in the structurally lowest levels of the window; structurally higher CMS near the window margins contains medium- to high-pressure greenschist facies parageneses. An 40Ar/39Ar crossite age indicates a late Middle Jurassic age of metamorphism. All subunits of the CMS contain evidence of progressive, polyphase deformational and metamorphic histories. The styles and geometries of minor structures in the central part of the window suggest that early folding and transposition was the result of noncoaxial deformation, and that rotational strains were replaced by irrotational flattening strains with time. Rotational strains were accompanied by the development of epidote-crossite assemblages and the growth of deerite in meta-ironstones; irrotational flattening strains were accompanied and followed by the growth of albite, actinolite, spessartine, and the Ba-silicate, cymrite. Pressure-temperature estimates, the relative ages of mineral growth and deformation, and strain geometries are consistent with, but not restricted to, a subduction zone environment. High shear strains may reflect descent and burial, whereas flattening and late, static mineral growth occur during uplift. Pressure-temperature estimates for the overlying CMS greenschists suggest temperatures similar to those in the central part of the window, but at slightly lower pressures. Thrusting of the overlying amphibolites at 150-156 Ma occurred while the amphibolites were above about 500°C. Stretching lineations indicate a movement vector of about N45W. Comparisons of the sequence and timing of metamorphic and structural events, radiometric ages, and movement directions during thrusting indicate the CMS does not represent an inlier of Klamath Western Jurassic Belt flysch but is instead an older, isolated thrust plate. Similarities with the age of metamorphism and plutonism in the overlying amphibolites suggest the two plates may be remnants of the same Middle Jurassic paired metamorphic belt.

Download or read book Belt Basin Window to Mesoproterozoic Earth written by John S. MacLean and published by Geological Society of America. This book was released on 2016-06-01 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: With its thickness of more than 15 km of strata, covering some 200,000 km2, the Belt basin displays one of the planet's largest, best-exposed, most accessible, and best-preserved sequences of Mesoproterozoic sedimentary and igneous rocks. This volume focuses on research into this world-class province; kindles ideas about this critical era of Earth evolution; and covers aspects of the basin from its paleontology, mineralogy, sedimentology, and stratigraphy to its magmatism, ore deposits, geophysics, and structural geology.