Download or read book The Isotopic Composition and Distribution of Lead Uranium and Thorium in a Pre Cambrian Granite written by and published by . This book was released on 1954 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Survey s Work on Isotope Geology of Uranium Thorium and Their Decay Products written by Ralph Smyser Cannon and published by . This book was released on 1952 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Uranium Thorium and Lead Concentrations and Lead Isotopic Composition of Biotite Granodiorite sample 9527 2b from LASL Drill Hole GT 2 written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation of the uranium (U), thorium (Th), and lead (Pb) isotopic systematics was made on the whole rock, microcline, plagioclase, biotite, sphene, zircon, epidote, and pyrite of a biotite granodiorite (core sample 9527-2b) obtained from a depth of almost 3 km in Los Alamos Scientific Laboratory's (LASL) deep drill hole GT-2. Except for quartz, magnetite, and apatite, all primary mineral phases were analyzed, as were epidote and pyrite from minute epidote--calcite--pyrite veinlets formed during a later fracture filling event. The sphene and zircon data offer strong support for an initial crystallization age of about 1500 +- 20 m.y for the biotite granodiorite. Likewise, a model age of about 1500 m.y. is calculated for the microcline. This amount of time is also required for the whole rock to evolve essentially as a closed system from an initial lead isotopic composition similar to that of the microcline. The plagioclase and biotite, on the other hand, clearly record isotopic disturbance at some time(s) subsequent to the crystallization of the rock. The isotopic systematics of the secondary epidote and pyrite do not allow for a unique determination of the age of the fracture-filling event, but suggest a more complex history of chemical migration extending perhaps from Precambrian to Phanerozoic time.
Download or read book Subject Index to Unclassified ASTIA Documents written by Defense Documentation Center (U.S.) and published by . This book was released on 1960 with total page 922 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book K Pb Fractionation Trends written by Jim E. Flis and published by . This book was released on 1975 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 1967 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Isotopic Geochemistry of Uranium and Lead written by John Laurence Kulp and published by . This book was released on 1960 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bulletin of the Geological Survey of Great Britain written by Geological Survey of Great Britain and published by . This book was released on 1955 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Geological Survey Professional Paper written by and published by . This book was released on 1967 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Uranium thorium and lead concentrations and lead isotopic composition of biotite granodiorite sample 9527 2b from LASL drill hole GT 2 written by Robert E. Zartman and published by . This book was released on 1979 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bulletin written by Geological Survey of Great Britain and published by . This book was released on 1955 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the Isotopic Constitution of Radium Ra 223 Ra 226 in Uranium Minerals written by Paul K. Kuroda and published by . This book was released on 1955 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Isotopic Distribution of Uranium and Thorium in Soils Weathered from Granite and Alluvium written by Richard Otto Hansen and published by . This book was released on 1965 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contributions to Geology written by and published by . This book was released on 1979 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contribution from the Scripps Institution of Oceanography written by Scripps Institution of Oceanography and published by . This book was released on 1965 with total page 1432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reprints from various publications.
Download or read book Contributions written by and published by . This book was released on 1963 with total page 1564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
