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  • 1
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    Hydrothermal cleft monazite SIMS Th-Pb age data, central Alps (2019)
    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
    Details
    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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    DATA PANGAEA
  • 2
    Electronic Resource
    Electronic Resource
    K-Ar ages of the metamorphic sole of the Semail Ophiolite: implications for ophiolite cooling history (1993)
    Springer
    Contributions to mineralogy and petrology 113 (1993), S. 325-332 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract K−Ar ages have been determined on micas and hornblendes in the basal metamorphic sequence and in metamorphic rocks squeezed into the mantle sequence of the Semail Ophiolite. The hornblende ages of 99±0.5 and 102±0.8 Ma and the 90 Ma ages of coexisting micas from the high-grade metamorphic portion of the sequence are interpreted as cooling stages following the peak of metamorphism (T 800–850° C, P 6.5–9 kbar). The new pressure estimates are based on findings of kyanite in garnet-amphibolite and cordierite in quartzitic rocks. These data indicate a cooling rate of 10–30° C/Ma. The oldest mica ages of 95±1 Ma are observed in the lowest-grade greenschists. These also largely represent cooling ages, but might in part also include formation ages. The pattern of the muscovite ages across the metamorphic sole indicates that the cooling front moved from the low-grade metamorphic zone, through the high-grade rocks and into the base of the overlying ophiolite. Radiometric ages of hornblendes (92.3±0.5 and 94.8±0.6 Ma) indicate that the crustal gabbro sequence cooled below 500° C later than the base of the ophiolite sequence. Metamorphism of the sole rocks occurred during subduction of oceanic sediments and volcanic or gabbroic rocks as they progressively came into contact with hotter zones at the base of the overriding plate. The peak of metamorphism must have been contemporaneous with the main magmatism in the Semail Ophiolite. One of the dated muscovites yields an age of 81.3±0.8 Ma, but this is related to discrete deformation zones that were active during late-stage emplacement of the ophiolite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00286925
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Tephroite-hausmannite-galaxite from a granulite-facies manganese rock of the United Arab Emirates (1995)
    Springer
    Contributions to mineralogy and petrology 120 (1995), S. 372-377 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The assemblage tephroite-hausmanniteSS-galaxiteSS has been found in a granulite-facies manganese ore body associated with metabasites and quartz-rich lithologies. The metamorphic rocks are located in the Khawr Fakkan massif near the northern end of the Semail Ophiolite, United Arab Emirates (U.A.E.), metamorphosed at 800–850° C and 6.5–9 kbar. The galaxite shows approximately 35% solid solution of hausmannite, similar to that reported for jacobsite and franklinite whereas the solid solution of galaxite in hausmannite is maximally 7%. The assemblage of tephroite-hausmannite and hausmannite-galaxite indicates a restricted log f O2 of −9 to −11 which is outside the stability of braunite under similar physico-chemical conditions. The modal abundance of the minerals and bulk rock chemistry indicate that the present assemblage was formed from the breakdown of Fe-poor braunitess+hausmannitess.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004100050081
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Sapphirine-quartz and sapphirine-corundum assemblages in metamorphic rocks associated with the Semail Ophiolite (United Arab Emirates) (1994)
    Springer
    Contributions to mineralogy and petrology 116 (1994), S. 398-410 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Granulite facies metasedimentary and metavolcanic rocks occur imbricated with the Cretaceous Semail Ophiolite in the United Arab Emirates and Oman. Peak metamorphic assemblages in highly oxidized lithologies of these rocks include sapphirine (7 : 9 : 3)-hercynitic spinel-magnetite-ilmeno-hematite-plagioclase-enstatite-quartz and sapphirine (2 : 2 : 1)-corundum-ilmeno-hematite-phlogopite-plagioclase. The observed mineral assemblages in quartzitic rocks are an example of overlapping stability of sapphirine-quartz and spinel-quartz and are therefore not diagnostic for high pressures. Both types of sapphirine occur within the stability field of Mg-rich cordierite. The common association of sapphirine and spinel with magnetite and ilmeno-hematite in quartzitic rocks suggests that sapphirine was formed by a reaction including spinel, hematite and quartz on the educt side. Metamorphic conditions estimated from associated parageneses point to temperatures of 800–850°C and pressures of 6.5–9 kbar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00310907
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Tephroite-hausmannite-galaxite from a granulite-facies manganese rock of the United Arab Emirates (1995)
    Springer
    Contributions to mineralogy and petrology 120 (1995), S. 372-377 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The assemblage tephroite-hausmannitess-galaxitess has been found in a granulite-facies manganese ore body associated with metabasites and quartzrich lithologies. The metamorphic rocks are located in the Khawr Fakkan massif near the northern end of the Semail Ophiolite, United Arab Emirates (U.A.E.), metamorphosed at 800–850°C and 6.5–9 kbar. The galaxite shows approximately 35% solid solution of hausmannite, similar to that reported for jacobsite and franklinite whereas the solid solution of galaxite in hausmannite is maximally 7%. The assemblage of tephroite-hausmannite and hausmannite-galaxite indicates a restricted log fO2 of-9 to-11 which is outside the stability of braunite under similar physico-chemical conditions. The modal abundance of the minerals and bulk rock chemistry indicate that the present assemblage was formed from the breakdown of Fe-poor braunitess+hausmannitess.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306514
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    Paper (German National Licenses)
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  • 6
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    The role of the Ranotsara Zone in southern Madagascar for Gondwana correlations (2010)
    Universitätsverlag Göttingen
    Details
    Publication Date: 2021-03-29
    Description: The Precambrian basement of southern Madagascar was reworked at high-grade metamorphic conditions during the East African Orogen (EAO of Stern, 1994) that formed during assembly of Gondwana in late Neoproterozoic/early Paleozoic times. At the end of the EAO, Madagascar is generally thought to be sandwiched between southern India and eastern Africa. Constraints on its paleoposition are often inferred from similarities in structural features on now dispersed continental fragments, in particular high-strain zones. Major zones with (sub)vertical foliation planes can be traced over hundreds of kilometres in southern Madagascar and have been interpreted as major vertical ductile shear zones (e.g. Windley et al. 1994; Martelat, 1998). The NW–SE trending Ranotsara Zone (dashed rectangle in Fig. 1) is regarded as an intracrustal mega strike-slip shear zone with a sinistral sense of shear that formed at the end of the Proterozoic (e.g. Nicollet, 1990; de Wit et al., 2001). A large number of studies have used the Ranotsara Zone to propose Gondwana reconstructions. The Ranotsara Zone has been correlated with various ductile shear zones in southern India, e.g. with the Bhavani Shear Zone or the Moyar Shear Zone (Katz & Premoli, 1979), the Palghat-Cauvery Shear Zone (de Wit et al., 1995), the Karur-Kamban- Painavum-Trichur Shear Zone (de Wit et al., 2001; Ghosh et al. 2004) or with the Achankovil Shear Zone (Windley et al., 1994; Martelat, 1998). Within Madagascar, the Ranotsara Zone has been correlated along strike with the more N–S trending Bongolava Zone in central-western Madagascar (Hottin 1976), and the Bongolava- Ranotsara Zone has been further traced into the Surma Shear Zone (Windley et al. 1994) and its along-strike continuation, the Aswa Shear Zone in eastern Africa (Müller 2000). Chetty (2003) suggested that the Ranotsara Zone is not only a mega shear zone, but also a terrane boundary separating a region with Archean crust to the north from a region with Neoproterozoic crust to the south. Our remote sensing and field studies of southern Madagascar indicate that the Ranotsara Zone is neither a major terrane boundary nor an intracrustal mega strike-slip shear zone and therefore can not be used as a ‘piercing point’ in Gondwana reconstructions...
    Description: conference
    Keywords: 551 ; VAE 700 ; VAE 500 ; VAE 850 ; VEQ 300 ; VKB 294 ; Bau der Erdkruste großer Regionen der Erde {Geologie} ; Geotektonische Entwicklung der Erdkruste {Geologie} ; Festländische Lineamente {Geologie} ; Madagaskar {Geologie} ; Metamorphe Komplexe, Afrika {Petrologie} ; Madagaskar 〈Süd〉 ; Präkambrium ; Kristallin ; Scherzone ; Korrelation ; Gondwana
    Language: German
    Type: anthologyArticle , publishedVersion
    Format: application/pdf
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    CITATION GEO-LEO
  • 7
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    DETRITAL MONAZITE IN THE TIM MERSOI BASIN, NIGER: PROVENANCE AND CONTRIBUTION TO THE URANIUM BUDGET IN SILICICLASTIC SEDIMENTS (2011)
    Mineralogical Association of Canada
    Details
    Publication Date: 2011-04-01
    Description: A detailed study using back-scattered electron imaging and electron-microprobe analysis shows that grains of detrital monazite are present in the Carboniferous, Permian, Triassic and Jurassic sediments of the Tim Mersoi basin, Niger. Despite variations in the size and shape of monazite grains, the U-Th-Pb chemical ages obtained by electron microprobe fall in a narrow range, 425 to 650 Ma. These ages indicate that the monazite grains are issued from the erosion of Pan-African granites and metamorphic rocks from the Air Mountains, and probably also from the basement near Zinder and in Nigeria, a hypothesis in good agreement with paleocurrent reconstruction. The uranium content of monazite from sediments is high (up to 1.7 wt% UO2), but low in adjacent rhyolite. Some monazite grains from the sandstone show evidence of alteration, especially to florencite. We conclude that detrital monazite is a major reservoir of uranium in some sandstones from the Tim Mersoi Basin.
    Print ISSN: 0008-4476
    Topics: Geosciences
    Published by Mineralogical Association of Canada
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    PAPER CURRENT
  • 8
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    Cenozoic deformation in the Tauern Window (Eastern Alps) constrained by in situ Th-Pb dating of fissure monazite (2020)
    Copernicus
    Details
    Publication Date: 2020-04-03
    Description: Thorium–lead (Th-Pb) crystallization ages of hydrothermal monazites from the western, central and eastern Tauern Window provide new insights into Cenozoic tectonic evolution of the Tauern metamorphic dome. Growth domain crystallization ages range from 21.7 ± 0.4 to 10.0 ± 0.2 Ma. Three major periods of monazite growth are recorded between ∼ 22–20 (peak at 21 Ma), 19–15 (major peak at 17 Ma) and 14–10 Ma (major peak around 12 Ma), respectively, interpreted to be related to prevailing N–S shortening, in association with E–W extension, beginning strike-slip movements and reactivation of strike-slip faulting. Fissure monazite ages largely overlap with zircon and apatite fission track data. Besides tracking the thermal evolution of the Tauern dome, monazite dates reflect episodic tectonic movement along major shear zones that took place during the formation of the dome. Geochronological and structural data from the Pfitschtal area in the western Tauern Window show the existence of two cleft generations separated in time by 4 Ma and related to strike-slip to oblique-slip faulting. Moreover, these two phases overprint earlier phases of fissure formation. Highlights. In situ dating of hydrothermal monazite-(Ce). New constraints on the exhumation of the Tauern metamorphic dome. Distinct tectonic pulses recorded from east to west.
    Print ISSN: 1869-9510
    Electronic ISSN: 1869-9529
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 9
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    Peak Metamorphic Conditions of Garnet Amphibolites Beneath the Semail Ophiolite: Implications for an Inverted Pressure Gradient (1998)
    Taylor & Francis
    Details
    Publication Date: 1998-04-01
    Print ISSN: 0020-6814
    Electronic ISSN: 1938-2839
    Topics: Geosciences
    Published by Taylor & Francis
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  • 10
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    Meteorite reconnaissance in Saudi Arabia (2018)
    Wiley
    Details
    Publication Date: 2018-07-01
    Print ISSN: 1086-9379
    Electronic ISSN: 1945-5100
    Topics: Geosciences , Physics
    Published by Wiley
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    PAPER CURRENT
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