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  • 1
    Series available for loan
    Series available for loan
    Shorter contributions to isotope research (1986)
    Washington, DC : United States Gov. Print. Off.
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    Call number: SR 90.0001(1622)
    In: U.S. Geological Survey bulletin
    Type of Medium: Series available for loan
    Pages: IV, 221 S.
    Series Statement: U.S. Geological Survey bulletin 1622
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
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    Series available for loan
    Reconstruction of crustal blocks of California on the basis of initial strontium isotopic compositions of Mesozoic granitic rocks (1978)
    Washington, DC : United States Gov. Print. Off.
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    Call number: SR 90.0002(1071)
    In: Professional paper
    Type of Medium: Series available for loan
    Pages: III, 17 S.
    Series Statement: U.S. Geological Survey professional paper 1071
    Language: English
    Location: Lower compact magazine
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  • 3
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    Series available for loan
    Reconnaissance geology and geochronology of the Precambrian of the Granite Mountains, Wyoming (1978)
    Washington, DC : United States Gov. Print. Off.
    Associated volumes
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    Call number: SR 90.0002(1055)
    In: Professional paper
    Type of Medium: Series available for loan
    Pages: III, 22 S.
    Series Statement: U.S. Geological Survey professional paper 1055
    Language: English
    Location: Lower compact magazine
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  • 4
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    Shorter contributions to isotope research in the western United States, 1980 (1981)
    Washington, DC : United States Gov. Print. Off.
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    Call number: SR 90.0003(1199-A-E)
    In: U.S. Geological Survey circular
    Type of Medium: Series available for loan
    Pages: 47 S.
    Series Statement: U.S. Geological Survey professional paper 1199-A-E
    Language: English
    Location: Lower compact magazine
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  • 5
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    Introduction to correlation of Precambrian rock sequences (1984)
    Washington, DC : United States Gov. Print. Off.
    Associated volumes
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    Call number: SR 90.0002(1241-A)
    In: Professional paper
    Type of Medium: Series available for loan
    Pages: III, A-7 S. + 1 pl.
    Series Statement: U.S. Geological Survey professional paper 1241-A
    Language: English
    Location: Lower compact magazine
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  • 6
    Electronic Resource
    Electronic Resource
    The strontium isotopic composition of basalts from the Gordo and Juan de Fuca Rises, northeastern Pacific Ocean (1970)
    Springer
    Contributions to mineralogy and petrology 27 (1970), S. 114-120 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The strontium isotopic compositions have been determined for twelve tholeiitic basalts dredged from the Gordo and Juan de Fuca Rises. Sr87/Sr86 ratios range from 0.7012 to 0.7031 and average 0.7026. These data, combined with other data from the East Pacific Rise indicate that tholeiite basalts being erupted along the active rises, in the Pacific Ocean, contain less radiogenic Sr87 than basalts erupted on the islands. These isotopic differences between the ocean-ridge tholeiite and the more alkali island basalts indicate that variations in Rb/Sr have persisted in the mantle for billions of years. The possible origins and distribution of these heterogeneties are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371978
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  • 7
    Electronic Resource
    Electronic Resource
    Lead and strontium isotopes in rocks of the Absaroka volcanic field, Wyoming (1970)
    Springer
    Contributions to mineralogy and petrology 27 (1970), S. 121-130 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The Absaroka volcanic field is comprised of predominant andesitic volcaniclastic rocks and less abundant potassium-rich mafic lavas (shoshonites and absarokites). Strontium and lead isotopic variations preclude a simple derivation from an isotopically uniform source: Sr87/Sr86, 0.7042 to 0.7090; Pb206/Pb204, 16.31 to 17.30; Pb208/Pb204, 36.82 to 37.64. We postulate that these rocks were derived from a lower crust or upper mantle which underwent a preferential loss of uranium relative to lead approximately 2800±200 m.y. ago. Variations in lead and strontium isotopic compositions are thought to reflect small inhomogeneities in U/Pb and Rb/Sr ratios in the source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371979
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  • 8
    Electronic Resource
    Electronic Resource
    A Rubidium-Strontium study of the Twilight Gneiss, West Needle Mountains, Colorado (1969)
    Springer
    Contributions to mineralogy and petrology 23 (1969), S. 271-282 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The Precambrian trondhjemitic Twilight Gneiss (Twilight Granite of Cross and Howe, 1905b) of the West Needle Mountains, southwestern Colorado, and its interlayered amphibolite and metarhyodacite yield a Rb-Sr isochron of 1,805±35 m.y. A low initial Sr87/Sr86 ratio of 0.7015 implies that metamorphism of these rocks to amphibolite facies took place soon after their emplacement. The mild metamorphism of Uncompahgran age, prior to 1,460 m.y. ago, and Laramide volcanism did not affect the Rb-Sr system in the Twilight. Rb contents of 26.5 to 108 ppm, Sr contents of 114 to 251 ppm, and K2O percentages of 1.23 to 3.64 in the Twilight Gneiss, in conjunction with high K/Rb ratios and the low initial ratio of Sr87/Sr86, lend support to geologic data that suggest the Twilight originated as volcanic or hypabyssal igneous rocks in a basaltic volcanic pile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371424
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  • 9
    Electronic Resource
    Electronic Resource
    Middle Proterozoic uplift events in the Dunbar dome of northeastern Wisconsin, USA (1985)
    Springer
    Contributions to mineralogy and petrology 91 (1985), S. 138-150 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Isotopic ages of granitic and metamorphic rocks exposed in the Dunbar structural dome of northeastern Wisconsin identify a protracted series of tectonic and “hydrothermal” events that culminated in major regional uplift during Middle Proterozoic (Keweenawan; ca 1,100 Ma) continental rifting and volcanism. The major rock-forming events and the structural development of the dome occurred during the interval 1,862+/−4 Ma to 1,836+/−6 Ma. Whole-rock Rb-Sr ages are partly reset in response to a widely recognized but cryptic event in Wisconsin and Michigan at about 1,630 Ma. The scale and systematic character of the whole-rock resetting strongly suggests the presence of a fluid phase derived in situ from water dissolved in the silicates or externally from a subthrust plate of low-grade metamorphic rocks. The regional nature of the 1,630-Ma disturbance possibly indicates that it is related to a major tectonic event such as an active plate margin far to the south. Rb-Sr biotite ages for the Dunbar dome (this study), the southern complex of the Marquette district (Van Schmus and Woolsey 1975) and the Felch trough area (Aldrich and others 1965) provide a remarkably coherent pattern that reflects multiple episodes of differential uplift. Younger events superimposed on a regional 1,630-Ma imprint are recorded at 1,330 Ma and 1,140 Ma. The 1,330 Ma disturbance could reflect stabilization following intrusion of the Wolf River batholith at 1,485 Ma. The 1,140-Ma uplift event occurred during Keweenawan rifting and volcanism as a result of stresses imposed on a mosaic of fault-bounded blocks with possible subcrustal influence. The remarkably small variance in the 1,140-Ma biotite age peak argues for rapid uplift and cooling, and hence rapid erosion. Detritus from the uplift probably was being shed into nearby tectonic basins most of which did not survive subsequent uplift and erosion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377761
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  • 10
    Electronic Resource
    Electronic Resource
    A reconnaissance study of oxygen, hydrogen and strontium isotopes in geochemically diverse lakes, Western Nebraska, USA (1997)
    Springer
    Journal of paleolimnology 17 (1997), S. 51-65 
    Details
    ISSN: 1573-0417
    Keywords: Stable isotopes ; strontium isotopes ; hydrology ; paleolimnology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Reconnaissance δ18O,, δD, and δ87Sr data for fifteen lakes in the Western Lakes Region of the Sand Hills of Nebraska indicate dynamic hydrologic systems. The rather narrow range of δ87Sr from lake water (1.1 to 2.1) and groundwater (0.9 to 1.7) indicates that the groundwater is generally unradiogenic. Groundwater residence times and relatively unradiogenic volcanic ash within the dune sediments control the δ87Sr values. Based on the mutual variations of δ18O and δD, the lakes can be divided into three groups. In Group 1, both δ18O and δD values increase from spring to fall. The δ18O and δD values in Group 2 decreased from spring to fall. Group 3 are ephemeral lakes that went dry some time during 1992. The data and isotopic modeling show that variations in the ratio of evaporation relative to groundwater inflow, local humidity conditions, and the δa has substantial influence on the isotopic composition. In addition, isotopic behavior in ephemeral lakes can be rather unusual because of the changing activities of water and mineral precipitation and redissolution. The annual and interannual isotopic variability of these lakes which is reflected in the paleonvironmental indicators may be the rule rather than the exception in these types of systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007913010057
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