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Geology Of The Precambrian Rocks Of The Keystone Pegmatite District Southern Black Hills South Dakota
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Book Synopsis Geology of the Precambrian Rocks of the Keystone Pegmatite District, Southern Black Hills, South Dakota by : James Jennings Norton
Download or read book Geology of the Precambrian Rocks of the Keystone Pegmatite District, Southern Black Hills, South Dakota written by James Jennings Norton and published by . This book was released on 1957 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structure and Mineralization of Precambrian Rocks in the Galena-Roubaix District, Black Hills, South Dakota by : Richard William Bayley
Download or read book Structure and Mineralization of Precambrian Rocks in the Galena-Roubaix District, Black Hills, South Dakota written by Richard William Bayley and published by . This book was released on 1970 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Survey Bulletin written by and published by . This book was released on 1986 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reconnaissance U-Pb Geochronology of Precambrian Crystalline Rocks from the Northern Black Hills, South Dakota by : Amiya Kumar Ghosh
Download or read book Reconnaissance U-Pb Geochronology of Precambrian Crystalline Rocks from the Northern Black Hills, South Dakota written by Amiya Kumar Ghosh and published by . This book was released on 2009 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Th/U-bearing accessory minerals monazite, zircon, and titanite occurring in selected metamorphic and igneous rocks from the northern Black Hills (NBH), South Dakota, were analyzed by standard U-Pb radiometric methods to unravel the Precambrian thermotectonic events that affected the area. Four metapelites from the Crook Mountain borehole contain metamorphic monazites for which EMP spot-analysis yielded total-Pb dates ranging from ~2680-1600 Ma but mostly between ~1790-1650 Ma. Individual spot-dates obtained for the metapelites were grouped according to compositional domains, as revealed by X-ray imagery, whereupon the resultant domain ages resolved into four discrete age clusters of ~1780 [plus or minus] 3 Ma (32% of the dates), ~1751 [plus or minus] 3 Ma (44%), ~1718 [plus or minus] 14 Ma (7%), and ~1650 [plus or minus] 9 Ma (16%, all dates reported at 95% confidence). These dates correspond to thermotectonic and magmatic events previously recognized at these times in the southern Black Hills, and the timing of Homestake gold mineralization is constrained between ~1740 -1718 Ma. Spot-analysis of zircon grains extracted from a Crook Mountain granite pegmatite yielded 207Pb/206Pb upper- and lower-intercept ages of 1718 [plus or minus] 22 Ma and 51 [plus or minus] 17 Ma, which are interpreted as intrusive and uplift ages, respectively. Detrital zircons of magmatic origin from two Black Hills metapelites have also been spot-dated. Five 207Pb/206Pb age populations are recognized at: ~3830 [plus or minus] 8, ~3365 [plus or minus] 5, ~3425 [plus or minus] 7,~3240 [plus or minus] 4, and ~2970 [plus or minus] 11 Ma. These ages indicate zircon provenance from the ~3550-2550 Ma Wyoming craton rather than from the ~2900-2600 Ma Superior craton. Thus, the Black Hills appears to have been part of the Wyoming craton as of 2015-1880 Ma shale deposition.
Book Synopsis Geology of the Precambrian Rocks in the Silver Creek Area, Near Rochford, Black Hills, South Dakota by : Richard Allen Cleath
Download or read book Geology of the Precambrian Rocks in the Silver Creek Area, Near Rochford, Black Hills, South Dakota written by Richard Allen Cleath and published by . This book was released on 1986 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Survey Circular written by and published by . This book was released on 1957 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geological Survey Professional Paper by : Geological Survey (U.S.)
Download or read book Geological Survey Professional Paper written by Geological Survey (U.S.) and published by . This book was released on 1957 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pegmatites and Other Precambrian Rocks in the Southern Black Hills by : Geological Survey (U.S.)
Download or read book Pegmatites and Other Precambrian Rocks in the Southern Black Hills written by Geological Survey (U.S.) and published by . This book was released on 1968 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reports and Maps of the Geological Survey Released Only in the Open Files, 1957 by : Betsy A. Weld
Download or read book Reports and Maps of the Geological Survey Released Only in the Open Files, 1957 written by Betsy A. Weld and published by . This book was released on 1957 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geological Survey Professional Paper by :
Download or read book Geological Survey Professional Paper written by and published by . This book was released on 1982 with total page 858 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reports and Maps of the Geological Survey Released Only in the Open Files, 1956 by : Betsy A. Weld
Download or read book Reports and Maps of the Geological Survey Released Only in the Open Files, 1956 written by Betsy A. Weld and published by . This book was released on 1956 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structure and mineralization of precambrian rocks in the Galena-Roubaix district, Black Hills, South Dakota by : R. W. Bayley
Download or read book Structure and mineralization of precambrian rocks in the Galena-Roubaix district, Black Hills, South Dakota written by R. W. Bayley and published by . This book was released on 1970 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pegmatites and Other Precambrian Rocks in the Southern Black Hills by : Donald Albert Brobst
Download or read book Pegmatites and Other Precambrian Rocks in the Southern Black Hills written by Donald Albert Brobst and published by . This book was released on 1957 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U.S. Geological Survey Professional Paper by :
Download or read book U.S. Geological Survey Professional Paper written by and published by . This book was released on 1968 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dictionary Catalog of the Department Library by : United States. Department of the Interior. Library
Download or read book Dictionary Catalog of the Department Library written by United States. Department of the Interior. Library and published by . This book was released on 1969 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geological Survey Research, 1980 by : Geological Survey (U.S.)
Download or read book Geological Survey Research, 1980 written by Geological Survey (U.S.) and published by . This book was released on 1980 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mineral and Water Resources of South Dakota by : Geological Survey (U.S.)
Download or read book Mineral and Water Resources of South Dakota written by Geological Survey (U.S.) and published by . This book was released on 1964 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
