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  • 1
    Call number: MR 90.0730
    Type of Medium: Monograph available for loan
    Pages: S. 352-360
    Language: German
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Keywords: lamprophyres; lamproites; petrology; geochemistry; source characteristics; metallogenesis
    Description / Table of Contents: 10 March 2021 --- Permian lamprophyres from the Western Carpathians: a review / Ján Spišiak, Lucia Vetráková, David Chew, Štefan Ferenc, Viera Šimonová, Juraj Butek and Tomáš Mikuš / Geological Society, London, Special Publications, 513, 10 March 2021, https://doi.org/10.1144/SP513-2020-237 --- 9 February 2021 --- Mesoproterozoic 40Ar-39Ar ages of some lamproites from the Cuddapah Basin and Eastern Dharwar Craton, southern India: implications for diamond provenance of the Banganapalle Conglomerates, age of the Kurnool Group and Columbia tectonics / Alok Kumar, Debojit Talukdar, N. V. Chalapathi Rao, R. Burgess and B. Lehmann / Geological Society, London, Special Publications, 513, https://doi.org/10.1144/SP513-2020-247 --- 27 January 2021 --- The story of post-Variscan lamprophyres of the Bohemian Massif: from ultramafic (Upper Cretaceous–Palaeocene) to alkaline (Eocene–Oligocene) types / J. Ulrych, L. Krmíček, J. Adamovič and S. Krmíčková / Geological Society, London, Special Publications, 513, https://doi.org/10.1144/SP513-2020-233 --- Porphyry Cu-Au±Mo mineralization hosted by potassic igneous rocks: implications from the giant Peschanka porphyry deposit, Baimka Trend (North East Siberia, Russia) / Andrey F. Chitalin, Ivan A. Baksheev, Yurii N. Nikolaev, Georgy T. Djedjeya, Yuliya N. Khabibullina and Daniel Müller / Geological Society, London, Special Publications, 513, https://doi.org/10.1144/SP513-2020-178 --- 26 January 2021 --- Petrology and Nd-Sr isotopic composition of alkaline lamprophyres from the Early to Late Cretaceous Mundwara alkaline complex, NW India: Evidence of crystal fractionation, accumulation and corrosion in a complex magma chamber plumbing system / Abhinay Sharma, Samarendra Sahoo, N. V. Chalapathi Rao, B. Belyatsky, P. Dhote and B. Lehmann / Geological Society, London, Special Publications, 513, https://doi.org/10.1144/SP513-2020-175 --- 25 January 2021 --- Paleoproterozoic metaluminous syenites synchronous with the c. 2.21 Ga mafic dyke swarms from the Eastern Dharwar Craton, India: implications for alkaline magmatism associated with the breakup of supercraton Superia / Ashutosh Pandey, N. V. Chalapathi Rao, Waliur Rahaman, Vikas Seth and Samarendra Sahoo / Geological Society, London, Special Publications, 513, https://doi.org/10.1144/SP513-2020-92
    Pages: Illustrationen, Diagramme, Karten
    Edition: online first
    Language: English
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  • 3
    ISSN: 0277-5387
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0495
    Keywords: Fluorine ; Fluorosis ; India
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Geochemical and hydrochemical studies were conducted in Nalgonda District (A.P.), to explore the causes of high fluorine in waters, causing a widespread incidence of fluorosis in the local population. Samples of granitic rocks, soils, stream sediments, and waters were analyzed for F and other salient chemical parameters. Samples from the area of Hyderabad city were analyzed for comparison. The F content of waters in areas with endemic fluorosis ranges from 0.4 to 20 mg/l. The low calcium content of rocks and soils, and the presence of high levels of sodium bicarbonate in soils and waters are important factors favoring high levels of F in waters.
    Type of Medium: Electronic Resource
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  • 5
    Publication Date: 1993-04-01
    Print ISSN: 0943-0105
    Electronic ISSN: 1432-0495
    Topics: Geosciences
    Published by Springer
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  • 6
    Publication Date: 2021-08-16
    Description: On 7 February, a glaciated ridge of Ronti mountain in the western Himalaya failed at 5600 m above sea level, causing a rockslide that induced a debris flow and flooding in the tributaries of the river Ganga (1). The events destroyed two hydroelectric projects and claimed more than 100 lives. Himalayan countries urgently need a robust early warning mechanism for rockslides and triggered flow cascades such as debris flow and flash floods. These flows move at up to tens of meters per second. In contrast, the elastic waves they generate have speeds of a few kilometers per second [(2), p. 59], arriving quickly at different seismic stations and potentially providing advance notice of disasters. A dense seismological network could be the key to a successful early warning system. Satellites are conventionally used to detect rockslides and cascading events, but the time gaps between satellite data acquisitions limit their utility for real-time monitoring [e.g., (3)]. Seismic stations can record several data samples per second [(2), p. 385], but the use of seismic data for this purpose strongly depends on the availability and proximity of a dense seismic network. The network would need several dozen stations within about 100 km of the area prone to hazard (4). The arrival time of various phases of a seismic wave at different stations in such a network could provide a close to real-time alert of a rockslide and could pinpoint when a rockslide transitions to a debris flow and where flood risks might increase (5). If the stations were connected by satellite to a monitoring center, seismic data could support automated detection, location, and early warning of hazardous flash floods. In the Indian state of Uttarakhand, the Council of Scientific & Industrial Research–National Geophysical Research Institute, Hyderabad, operates a dense network of more than 80 seismic stations (6). The individual phases of the 7 February event are likely identifiable in the records at these stations. Efforts are currently under way to develop a rockslide and flood early warning system for the Himalayan region by using dense networks for seismic monitoring (5, 6), coupled with interpretation of satellite data, numerical modeling, and geomorphic analysis. Such a system could potentially provide crucial warning information shortly after initiation of an event, enabling evacuation at downstream locations. With climate change playing a major role in accelerating ice loss in the mountain glaciers (7), likely leading to increased frequency of flash floods, real-time seismic monitoring may become the key to minimizing damage and casualties caused by these events.
    Type: info:eu-repo/semantics/article
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  • 7
    Publication Date: 2021-10-08
    Description: Early warning is a critical potential tool for mitigating the impacts of large mass wasting and flood events, a major hazard in the Himalaya. We used data from a dense seismic network in Uttarakhand, India, to detect and track a fatal rockslide to mass flow to flood cascade and examine the potential for regional networks to provide early warning for extreme flow events. Detection limits of the 7 February 2021 event depend on the nature of the active process and on the anthropogenic and environmental seismic noise levels at each station. With the existing network, a seismic monitoring system could have detected all event phases from up to 100 kilometers and provided downstream warnings within minutes of event initiation.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 8
    Publication Date: 2021-03-16
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 9
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    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Publication Date: 2023-12-11
    Description: The characterization of a seismic source is crucial to understand seismogenic processes. Simplified source models, e.g., a moment tensor, may not be suited for certain physical processes, such as landslides or complex earthquake ruptures. We propose here a double source model to reproduce landslide processes, with two opposite oriented forces representing the detachment and impact of a sliding mass. A double source model is also suited to characterize complex earthquake ruptures, as it allows modeling the failure of two patches along a single or on two different faults. The inversion for a double source is implemented in a Bayesian bootstrap-based probabilistic inversion scheme with uncertainty estimation for all parameters. In the case of landslides, the source is described by two independent single forces and earthquakes are described by two dependent double-couples. The double single-force model includes 16 free parameters and the double double-couple model includes 18. Here we show the results obtained in the analysis of three different landslides (Val Bondasca-Switzerland 2017, Anak Krakatoa-Indonesia 2018 and Uttarakhand-India 2021) and two complex earthquake ruptures (Alaska 2018, South Sandwich islands 2021). Our findings show that our approach can resolve the landslide geometry and slope orientation. For the case of earthquakes, we were able to resolve the focal mechanism along two faults, which were active during the Alaska 2018 earthquake, as well as the time delay and orientation of the South Sandwich doublet in 2021.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 86 (1982), S. 4777-4781 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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