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  • 1
    Monograph available for loan
    Monograph available for loan
    Archean granitoids of India : windows into early earth tectonics (2020)
    London : The Geological Society
    Associated volumes
    Details
    Call number: 9/M 07.0421(489)
    In: Geological Society special publication : 489
    Type of Medium: Monograph available for loan
    Pages: 320 Seiten , Illustrationen
    ISBN: 978-1-78620-446-2
    Series Statement: Geological Society special publication no. 489
    URL: https://sp.lyellcollection.org/content/489/1
    Language: English
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  • 2
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    Archean Granitoids of India: Windows into Early Earth Tectonics (2020)
    London : The Geological Society
    Details
    Keywords: India ; Archean granitoids ; Indian cratons ; Archean supercontinents ; Archean tectonics ; early earth
    Description / Table of Contents: Archean granitoids of India: windows into early Earth tectonics – an introduction / Sukanta Dey and Jean-François Moyen / Geological Society, London, Special Publications, 489, 1-13, 17 September 2020, https://doi.org/10.1144/SP489-2020-155 --- Archean granitoids: classification, petrology, geochemistry and origin / Jean-François Moyen / Geological Society, London, Special Publications, 489, 15-49, 1 January 2019, https://doi.org/10.1144/SP489-2018-34 --- Crustal growth of the Eastern Dharwar Craton: a Neoarchean collisional orogeny? / M. Ram Mohan, Ajay Dev Asokan and Simon A. Wilde / Geological Society, London, Special Publications, 489, 51-77, 3 February 2020, https://doi.org/10.1144/SP489-2019-108 --- Geochronology and geochemistry of Meso- to Neoarchean magmatic epidote-bearing potassic granites, western Dharwar Craton (Bellur–Nagamangala–Pandavpura corridor), southern India: implications for the successive stages of crustal reworking and cratonization / M. Jayananda, Martin Guitreau, T. Tarun Thomas, Hervé Martin, K. R. Aadhiseshan, R. V. Gireesh, Jean-Jacques Peucat and M. Satyanarayanan / Geological Society, London, Special Publications, 489, 79-114, 1 January 2019, https://doi.org/10.1144/SP489-2018-125 --- Water budget and partial melting in an Archean crustal column: example from the Dharwar Craton, India / Gautier Nicoli / Geological Society, London, Special Publications, 489, 115-133, 1 January 2019, https://doi.org/10.1144/SP489-2018-88 --- Archean granitoids of the Bastar Craton, Central India / M. E. A. Mondal, M. Faruque Hussain and Talat Ahmad / Geological Society, London, Special Publications, 489, 135-155, 1 January 2019, https://doi.org/10.1144/SP489-2019-311 --- Dissecting through the metallogenic potentials of Precambrian granitoids: case studies from the Bastar and Eastern Dharwar Cratons, India / Dinesh Pandit, Sourabh Bhattacharya and Mruganka K. Panigrahi / Geological Society, London, Special Publications, 489, 157-188, 1 January 2019, https://doi.org/10.1144/SP489-2019-342 --- Mechanism of Paleoarchean continental crust formation as archived in granitoids from the northern part of Singhbhum Craton, eastern India / Sukanta Dey, Sibani Kumari Nayak, Aniruddha Mitra, Keqing Zong and Yongsheng Liu / Geological Society, London, Special Publications, 489, 189-214, 17 September 2020, https://doi.org/10.1144/SP489-2019-202 --- Archean granitoids of the Aravalli Craton, northwest India / Iftikhar Ahmad, M. E. A. Mondal, Md Sayad Rahaman, Rajneesh Bhutani and M. Satyanarayanan / Geological Society, London, Special Publications, 489, 215-234, 8 April 2020, https://doi.org/10.1144/SP489-2018-195 --- Archean crustal evolution of the Bundelkhand Craton: evidence from granitoid magmatism / Vinod K. Singh, Sanjeet K. Verma, Pradip K. Singh, A. I. Slabunov, Sumit Mishra and Neeraj Chaudhary / Geological Society, London, Special Publications, 489, 235-259, 19 December 2019, https://doi.org/10.1144/SP489-2018-72 --- Deformation-driven emplacement-differentiation in the Closepet pluton, Dharwar Craton, South India: an alternate view / Abhijit Bhattacharya / Geological Society, London, Special Publications, 489, 261-274, 1 January 2019, https://doi.org/10.1144/SP489-2019-315 --- Application of anisotropy of magnetic susceptibility (AMS) in understanding regional deformation, fabric development and granite emplacement: examples from Indian cratons / Manish A. Mamtani, Sandeep Bhatt, Virendra Rana, Koushik Sen and Tridib K. Mondal / Geological Society, London, Special Publications, 489, 275-292, 1 January 2019, https://doi.org/10.1144/SP489-2019-292 --- Mineral–fluid interactions in the late Archean Closepet granite batholith, Dharwar Craton, southern India / E. Słaby, K. Gros, H.-J. Förster, A. Wudarska, Ł. Birski, M. Hamada, J. Götze, H. Martin, M. Jayananda, J.-F. Moyen and I. Moszumańska / Geological Society, London, Special Publications, 489, 293-314, 1 January 2019, https://doi.org/10.1144/SP489-2019-287
    Pages: Online-Ressource (320 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781786204462
    URL: https://sp.lyellcollection.org/content/489/1
    Language: English
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  • 3
    Electronic Resource
    Electronic Resource
    Record of mid-Archaean subduction from metamorphism in the Barberton terrain, South Africa (2006)
    [s.l.] : Nature Publishing Group
    Nature 442 (2006), S. 559-562 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Although plate tectonics is the central geological process of the modern Earth, its form and existence during the Archaean era (4.0–2.5 Gyr ago) are disputed. The existence of subduction during this time is particularly controversial because characteristic subduction-related mineral ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04972
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  • 4
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    Archean granitoids of India: windows into early Earth tectonics – an introduction (2020)
    Geological Society of London
    Details
    Publication Date: 2020-07-03
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
    Published by Geological Society of London
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  • 5
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    Short-term episodicity of Archaean plate tectonics (2012)
    Geological Society of America (GSA)
    Details
    Publication Date: 2012-05-01
    Description: By combining geochemical data and geodynamical models, evidence is provided to address the existence and style of Archaean plate tectonics, a topic of vigorous debate for decades. Using careful analyses of lithostratigraphic Archaean assemblages and numerical model results, we illustrate that a short-term episodic style of subduction was a viable style of tectonics in the early Earth. Modeling results show how, due to the low strength of slabs in a hotter Earth, frequent slab break-off events prevented a modern-style long-lived subduction system, and resulted in frequent cessation and re-initiation of the subduction process on a typical time scale of a few million years. Results fit with geochemical observations that suggest frequent alternation of arc-style and non-arc-style volcanism on a similarly short time scale. Such tectonics could provide the link between early pre-plate tectonic style of tectonics (or stagnant-lid convection) and modern-style plate tectonics, in which short-term episodes of proto-subduction evolved over time into a longer-term, more successful style of plate tectonics as mantle temperature decayed.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 6
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    Diversity in Earth's early felsic crust: Paleoarchean peraluminous granites of the Barberton Greenstone Belt (2011)
    Geological Society of America (GSA)
    Details
    Publication Date: 2011-10-01
    Description: Earth's oldest preserved granitoid crust dates back to the Paleoarchean and consists predominantly of sodic tonalite-trondhjemite-granodiorite (TTG) granitoids that arose through the partial melting of hydrated metabasalts. In contrast, granites (sensu stricto) typically appear relatively late in the plutonic record of the old cratons. However, the existence of Hadean zircons with mineral inclusion suites that are consistent with crystallization from peraluminous granitic magmas indicates that granitic rocks formed part of the earliest felsic crust; although we have direct evidence, this earliest felsic crust is not preserved. Here we present evidence of an unusual variety of markedly low-CaO, K2O-rich, rutile-bearing, peraluminous granite and rhyolite that was produced concurrently with TTG magmas during three magmatic cycles in the Barberton Greenstone Belt (BGB), southern Africa. This material is not preserved as in situ rock units, but occurs as clasts within a younger conglomerate. Within these rocks, plagioclase feldspar is a rare inclusion in zircon, relative to alkali feldspar, and has low anorthite contents (An 〈 15%), attesting to the primary nature of the low-Ca signature of the magmas. This, along with Eu/Eu* [~] 1, high K2O and Sr content, as well as the peraluminous character of the magmas, is a consequence of phengite melting in a metagraywacke source at pressures in excess of those of plagioclase stability. This process contributed to each episode of continental crustal growth through the Paleoarchean to Mesoarchean in the BGB, despite leaving no plutonic record at the typical mid-crustal level of exposure that the TTG plutons around the belt represent.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 7
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    Flow of partially molten crust controlling construction, growth and collapse of the Variscan orogenic belt: the geologic record of the French Massif Central (2020)
    EDP Sciences
    Details
    Publication Date: 2020-01-01
    Description: We present here a tectonic-geodynamic model for the generation and flow of partially molten rocks and for magmatism during the Variscan orogenic evolution from the Silurian to the late Carboniferous based on a synthesis of geological data from the French Massif Central. Eclogite facies metamorphism of mafic and ultramafic rocks records the subduction of the Gondwana hyperextended margin. Part of these eclogites are forming boudins-enclaves in felsic HP granulite facies migmatites partly retrogressed into amphibolite facies attesting for continental subduction followed by thermal relaxation and decompression. We propose that HP partial melting has triggered mechanical decoupling of the partially molten continental rocks from the subducting slab. This would have allowed buoyancy-driven exhumation and entrainment of pieces of oceanic lithosphere and subcontinental mantle. Geochronological data of the eclogite-bearing HP migmatites points to diachronous emplacement of distinct nappes from middle to late Devonian. These nappes were thrusted onto metapelites and orthogneisses affected by MP/MT greenschist to amphibolite facies metamorphism reaching partial melting attributed to the late Devonian to early Carboniferous thickening of the crust. The emplacement of laccoliths rooted into strike-slip transcurrent shear zones capped by low-angle detachments from c. 345 to c. 310 Ma is concomitant with the southward propagation of the Variscan deformation front marked by deposition of clastic sediments in foreland basins. We attribute these features to horizontal growth of the Variscan belt and formation of an orogenic plateau by gravity-driven lateral flow of the partially molten orogenic root. The diversity of the magmatic rocks points to various crustal sources with modest, but systematic mantle-derived input. In the eastern French Massif Central, the southward decrease in age of the mantle- and crustal-derived plutonic rocks from c. 345 Ma to c. 310 Ma suggests southward retreat of a northward subducting slab toward the Paleotethys free boundary. Late Carboniferous destruction of the Variscan belt is dominantly achieved by gravitational collapse accommodated by the activation of low-angle detachments and the exhumation-crystallization of the partially molten orogenic root forming crustal-scale LP migmatite domes from c. 305 Ma to c. 295 Ma, coeval with orogen-parallel flow in the external zone. Laccoliths emplaced along low-angle detachments and intrusive dykes with sharp contacts correspond to the segregation of the last melt fraction leaving behind a thick accumulation of refractory LP felsic and mafic granulites in the lower crust. This model points to the primordial role of partial melting and magmatism in the tectonic-geodynamic evolution of the Variscan orogenic belt. In particular, partial melting and magma transfer (i) triggers mechanical decoupling of subducted units from the downgoing slab and their syn-orogenic exhumation; (ii) the development of an orogenic plateau by lateral flow of the low-viscosity partially molten crust; and, (iii) the formation of metamorphic core complexes and domes that accommodate post-orogenic exhumation during gravitational collapse. All these processes contribute to differentiation and stabilisation of the orogenic crust.
    Print ISSN: 0037-9409
    Electronic ISSN: 1777-5817
    Topics: Geosciences
    Published by EDP Sciences on behalf of Société Géologique de France.
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  • 8
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    Multiple Sulfur Isotope Records of the 3.22 Ga Moodies Group, Barberton Greenstone Belt (2020)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2020-04-16
    Description: The Moodies Group, the uppermost unit in the Barberton Greenstone Belt (BGB) in South Africa, is a ~3.7-km-thick coarse clastic succession accumulated on terrestrial-to-shallow marine settings at around 3.22 Ga. The multiple sulfur isotopic composition of pyrite of Moodies intervals was newly obtained to examine the influence of these depositional settings on the sulfur isotope record. Conglomerate and sandstone rocks were collected from three synclines north of the Inyoka Fault of the central BGB, namely, the Eureka, Dycedale, and Saddleback synclines. The sulfur isotopic composition of pyrite was analyzed by Secondary Ion Mass Spectrometry (SIMS) for 6 samples from the three synclines and by Isotope Ratio Mass Spectrometry (IR-MS) for 17 samples from a stratigraphic section in the Saddleback Syncline. The present results show a signal of mass-independent fractionation of sulfur isotopes (S-MIF), although t-tests statistically demonstrated that the Moodies S-MIF signals (mostly 0‰ 〈 ∆33S 〈 +0.5‰) are significantly small compared to the signal of the older Paleoarchean (3.6–3.2 Ga) records. These peculiar signatures might be related to initial deposition of detrital pyrite of juvenile origin from the surrounding intrusive (tonalite–trondhjemite–granodiorite; TTG) and felsic volcanic rocks, and/or to secondary addition of hydrothermal sulfur during late metasomatism. Moreover, fast accumulation (~0.1–1 mm/year) of the Moodies sediments might have led to a reduced accumulation of sulfur derived from an atmospheric source during their deposition. As a result, the sulfur isotopic composition of the sediments may have become susceptible to the secondary addition of metasomatic sulfur on a mass balance point of view. The sulfur isotopic composition of Moodies pyrite is similar to the composition of sulfides from nearby gold mines. It suggests that, after the Moodies deposition, metasomatic pyrite formation commonly occurred north of the Inyoka Fault in the central BGB at 3.1–3.0 Ga.
    Electronic ISSN: 2076-3263
    Topics: Geosciences
    Published by Molecular Diversity Preservation International
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  • 9
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    The redistribution of thorium, uranium, potassium by magmatic and hydrothermal processes versus surface processes in the Saraya Batholith (Eastern Senegal): Insights from airborne radiometrics data and topographic roughness (2020)
    Elsevier
    Details
    Publication Date: 2020-12-01
    Print ISSN: 0375-6742
    Electronic ISSN: 1879-1689
    Topics: Chemistry and Pharmacology , Geosciences
    Published by Elsevier
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  • 10
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    Archean Subduction: Fact or Fiction? (2012)
    Annual Reviews
    Details
    Publication Date: 2012-05-30
    Print ISSN: 0084-6597
    Electronic ISSN: 1545-4495
    Topics: Geosciences , Physics
    Published by Annual Reviews
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