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  • 1
    Call number: 9/M 07.0421(449)
    In: Geological Society special publication ; 449
    Type of Medium: Monograph available for loan
    Pages: 256 Seiten , Illustrationen
    ISBN: 9781786202802
    Series Statement: Geological Society special publications 449
    Classification:
    Historical Geology
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Description / Table of Contents: This Special Publication sheds light on crust formation and tectonic processes in early Earth by focusing on Archaean granitoids and related rocks from West Greenland in the North Atlantic Craton, Karelia Province of the Fennoscandian Shield, Eastern Dharwar and Bundelkhand cratons in the Indian Shield and Bug Complex of the Ukrainian Shield. Resulting from the IGCP-SIDA 599 project ‘The Changing Early Earth’, this compilation of papers provides explanations on the nomenclature of Archaean granitoids and explores the petrology, element and isotope geochemistry, geochronology and metamorphism of granitoids and supracrustal rocks of variable metamorphic grade. This volume provides information on the increase and timing of crust-mantle interactions and granitoid diversification from early Archaean protoliths of island arc origin to the emergence of multi-source high-K calc-alkaline granitoid batholiths at convergent continental margins. The formation of abundant granitoid batholiths suggests a significant change in mantle dynamics and plate tectonics towards the end of the Archaean.
    Pages: Online-Ressource (VII, 256 Seiten)
    ISBN: 9781786202802
    Language: English
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  • 3
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    PANGAEA
    In:  Supplement to: Bergemann, Christian A; Gnos, Edwin; Berger, Alfons; Janots, Emilie; Whitehouse, Martin J (2020): Dating tectonic activity in the Lepontine Dome and Rhone-Simplon Fault regions through hydrothermal monazite-(Ce). Solid Earth, 11(1), 199-222, https://doi.org/10.5194/se-11-199-2020
    Publication Date: 2023-02-25
    Description: Ion probe (SIMS) Th-Pb age measurements of hydrothermal fissure/cleft monazite from the central Alps. The sample area encompasses most of the Lepontine metamorphic dome, the eastern Rhone-Simplon Line, southern Gotthard Nappe and the Forcola Fault. The ages directly date deformation during part of the exhumation and cooling history of the Lepontine dome and deformation along the Rhone-Simplon fault zone. The ages of all crystals range from ca. 19 to 5 Ma, with age distribution and internal crystal structure facilitating to distinguish between areas whose deformational history was dominated by distinct tectonic events or continuous exhumation.
    Keywords: Age, error; Age, Lead-Thorium; Age, mineral; Alpe Devero, Val Antigorio; BETT11; Bettelbach, Niederwald, Goms; BLAS1; Cava Maddalena, Beura; Crino Baceno; Doru, Gantertal, Simplon; DURO1; DURO2; DUTH2; DUTH3; DUTH6; Error, absolute; Error, relative; Event label; GRAESER1; GRAESER3; Griessgletscher; Grosses Arsch, Blinnental; KLEM1; KLEM2; KLEM3; Laercheltini, Binntal; Lago Retica, Lagi di Campo Blenio; Lago Sucro, Val Cadlimo; Lead; Lead-204/Lead-208, error, relative; Lead-204/Lead-208 ratio; Lead-208/Thorium-232, error, relative; Lead-208/Thorium-232 ratio; LUCO1; Lucomagno; Montecrstese; MULT; Multiple investigations; Original value; Parameter; Piz, Scai; Piz Blas, Val Nalps, Sedrun; Pizzo Ruescada, Valle di Prato (Lavizzara); Pizzo Tambo, Spluegen; Ratio; SALZ2; Sample code/label; Sample code/label 2; SCHIESS1; Schiessbach/Simplon; Secondary ion mass spectrometry (SIMS); TAMB1; Thorium; Thorium/Uranium ratio; Uranium; VALS; Vals, Valsertal; VANI4; VANI5; VANI6; Wannigletscher, Cherbadung, Binntal
    Type: Dataset
    Format: text/tab-separated-values, 8550 data points
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  • 4
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    PANGAEA
    In:  Supplement to: Kenny, Gavin; Schmieder, Martin; Whitehouse, Martin J; Nemchin, Alexander A; Morales, Luiz F G; Buchner, Elmar; Bellucci, Jeremy J; Snape, Joshua F (2019): A new U-Pb age for shock-recrystallised zircon from the Lappajärvi impact crater, Finland, and implications for the accurate dating of impact events. Geochimica et Cosmochimica Acta, 245, 479-494, https://doi.org/10.1016/j.gca.2018.11.021
    Publication Date: 2023-01-13
    Description: U-Pb data for shock-recrystallised zircon from the Lappajärvi impact crater, Finland.
    Keywords: Age, 206Pb/238U Lead-Uranium; Age, 207Pb/206Pb Lead-Lead; Age, 207Pb/235U Lead-Uranium; Age, error, relative; Age, mineral; Comment; Common 206Pb in total 206Pb; Correlation coefficient, isotope ratio error; Discordance; EBSD; Event label; Finland; Identification; impact cratering; Karnaite impact melt rock, Lappajarvi; Lappajarvi; Lead; Lead-206/Lead-204 ratio; Lead-206/Uranium-238, error, relative; Lead-206/Uranium-238 ratio; Lead-207/Lead-206, error, relative; Lead-207/Lead-206 ratio; Lead-207/Uranium-235, error, relative; Lead-207/Uranium-235 ratio; n5747; ROCK; Rock sample; Sample ID; Secondary ion mass spectrometry (SIMS); shock metamorphism; shock-recrystallised zircon; SIMS; Size; Texture; Thorium; Thorium/Uranium ratio; U-Pb; Uranium
    Type: Dataset
    Format: text/tab-separated-values, 814 data points
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  • 5
    ISSN: 1751-908X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: This paper reports the results from a second characterisation of the 91500 zircon, including data from electron probe microanalysis, laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS), secondary ion mass spectrometry (SIMS) and laser fluorination analyses. The focus of this initiative was to establish the suitability of this large single zircon crystal for calibrating in situ analyses of the rare earth elements and oxygen isotopes, as well as to provide working values for key geochemical systems. In addition to extensive testing of the chemical and structural homogeneity of this sample, the occurrence of banding in 91500 in both backscattered electron and cathodoluminescence images is described in detail. Blind intercomparison data reported by both LA-ICP-MS and SIMS laboratories indicate that only small systematic differences exist between the data sets provided by these two techniques. Furthermore, the use of NIST SRM 610 glass as the calibrant for SIMS analyses was found to introduce little or no systematic error into the results for zircon. Based on both laser fluorination and SIMS data, zircon 91500 seems to be very well suited for calibrating in situ oxygen isotopic analyses.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 37 (1989), S. 1509-1513 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geostandards and geoanalytical research 28 (2004), S. 0 
    ISSN: 1751-908X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A method is presented for the determination of rare earth elements (REE) in zircon (ZrSiO4) using a multi-collector equipped ion-microprobe operating at moderately high mass resolution (M/ΔM ˜ 3900). The low abundance light REE (La-Eu) were measured simultaneously in six ion counting electron multipliers, reducing analytical time to less than half of that in a monocollection routine. Effective mass filtering, moderate energy filtering and careful set up of detector parameters in order to minimise background counts, yielded a highly coherent set of analyses from the 91500 zircon reference sample.
    Type of Medium: Electronic Resource
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  • 8
    Publication Date: 2003-01-01
    Description: Rare earth element (REE) analysis of zircon coupled with high spatial resolution U-Pb geochronology and imaging is emerging as a useful petrogenetic tool capable of providing a link between dated zircon growth and contemporaneous magmatic conditions or metamorphic reactions. Notable amongst recent studies has been the link established between zircon growth in equilibrium with garnet and characteristic heavy REE depletion in zircon which has enabled the dating of specific pressure-temperature (P-T) evolution. Links to other REE-bearing minerals have yet to be established but have similar potential for dating P-T pathways. A brief review of recent applications in both igneous and metamorphic zircons is presented here to illustrate the range of investigations in this rapidly developing area. The method is then applied to two case studies from the late-Archaean Lewisian Composite Terrane of the Outer Hebrides, NW Scotland. In both cases, these new zircon REE analyses reveal previously unknown events in the early history of these samples, as well as clarifying the relationship of different zircon growth phases in relation to the geochronology.
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  • 9
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    In:  Geological Society Special Publication 190: 177-203.
    Publication Date: 2001-01-01
    Description: Ages in the range 3.6-4.0 Ga (billion years) have been reported for the oldest, continental, granitoid orthogeneisses, whose magmatic precursors were probably formed by partial melting or differentiation from a mafic, mantle-derived source. The geological interpretation of some of the oldest ages in this range is still strongly disputed. The oldest known supracrustal (i.e. volcanic and sedimentary) rocks, with an age of 3.7-3.8 Ga, occur in West Greenland. They were deposited in water, and several of the sediments contain 13C-depleted graphite microparticles, which have been claimed to be biogenic. Ancient sediments (c. 3 Ga) in western Australia contain much older detrital zircons with dates ranging up to 4.4 Ga. The nature and origin of their source is highly debatable. Some ancient (magmatic) orthogneisses (c. 3.65-3.75 Ga) contain inherited zircons with dates up to c. 4.0 Ga. To clarify whether zircons in orthogneisses are inherited from an older source region or cogenetic with their host rock, it is desirable to combine imaging studies and U-Pb dating of single zircon grains with independent dating of the host rock by other methods, including Sm-Nd, Lu-Hf and Pb/Pb. Initial Nd, Hf and Pb isotopic ratios of ancient orthogneisses are essential parameters for investigating the degree of heterogeneity of early Archaean mantle. The simplest interpretation of existing isotopic data is for a slightly depleted, close-to-chondritic, essentially homogeneous early Archaean mantle; this does not favour the existence of a sizeable, permanent continental crust in the early Archaean. By analogy with the moon, massive bolide impacts probably terminated on Earth by c. 3.8-3.9 Ga, although no evidence for them has yet been found. By c. 3.65 Ga production of continental crust was well underway, and global tectonic and petrogenetic regimes increasingly resembled those of later epochs.
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  • 10
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