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  • 1
    Monograph available for loan
    Monograph available for loan
    Dynamics of crustal magma transfer, storage and differentiation (2008)
    London : The Geological Society
    Associated volumes
    Details Availability
    Call number: 9/M 07.0421(304)
    In: Geological Society special publication
    Type of Medium: Monograph available for loan
    Pages: 288 S. : Ill., graph. Darst.
    ISBN: 9781862392588
    Series Statement: Geological Society special publication 304
    URL: http://sp.lyellcollection.org/content/vol304/issue1/
    Classification:
    Geology
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    The Role of Volatiles in the Genesis, Evolution and Eruption of Arc Magmas (2015)
    London : The Geological Society
    Associated volumes
    Details Availability
    Call number: 9/M 07.0421(410)
    In: Geological Society special publication
    Description / Table of Contents: The subduction zone volatile cycle is key to understanding the petrogenesis, transport, storage and eruption of arc magmas. Volatiles control the flux of slab components into the mantle wedge, are responsible for melt generation through lowering the solidi of mantle materials and influence the crystallizing phase assemblages in the overriding crust. Further, the rates and extents of degassing during magma storage and decompression affect magma rheology, ultimately control eruption style and have consequences for the environmental impact of explosive arc volcanism. This book highlights recent progress in constraining the role of volatiles in magmatic processes. Individual book sections are devoted to tracing volatiles from the subducting slab to the overriding crust, their role in subvolcanic processes and eruption triggering, as well as magmatic-hydrothermal systems and volcanic degassing. For the first time, all aspects of the overarching theme of volatile cycling are covered in detail within a single volume.
    Type of Medium: Monograph available for loan
    Pages: 292 S.
    ISBN: 9781862396890
    Series Statement: Geological Society special publication 410
    URL: http://sp.lyellcollection.org/content/410/1
    Classification:
    Petrology, Petrography
    Location: Reading room
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  • 3
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    Dynamics of Crustal Magma Transfer, Storage and Differentiation (2008)
    London : The Geological Society
    Details
    Description / Table of Contents: Magmas are subject to a series of processes that lead to their differentiation during transfer through, and storage within, the Earth's crust. The depths and mechanisms of differentiation, the crustal contribution to magma generation through wall-rock assimilation, the rates and timescales of magma generation, transfer and storage, and how these link to the thermal state of the crust are subject to vivid debate and controversy. This volume presents a collection of research articles that provide a balanced overview of the diverse approaches available to elucidate these topics, and includes both theoretical models and case studies. By integrating petrological, geochemical and geophysical approaches, it offers new insights to the subject of magmatic processes operating within the Earth's crust, and reveals important links between subsurface processes and volcanism.
    Pages: Online-Ressource (VII, 288 Seiten)
    ISBN: 9781862392588
    URL: http://sp.lyellcollection.org/content/vol304/issue1/
    Language: English
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  • 4
    Monograph available for loan
    Monograph available for loan
    Orogenic andesites and crustal growth (2014)
    London : The Geological Society
    Associated volumes
    Details Availability
    Call number: 9/M 07.0421(385)
    In: Geological Society special publication
    Description / Table of Contents: Orogenic andesites have long intrigued scientists because of their remarkable compositional similarities to the continental crust. The significance of orogenic andesites as proxies to continental crust formation has been recognized for over 30 years, but no consensus model of andesite genesis exists. Much of the controversy revolves around whether orogenic andesites are primary melts of slab and mantle materials, or instead evolve from basaltic mantle melts at shallower crustal levels. In three sections, this book provides an overview of andesite genesis at convergent margins that focuses on the slab mantle interaction, crustal processing and andesite evolution through the life of volcanic arcs. Without favouring a particular view, the books aims to engender cross-fertilization and discussion that will smooth the pathway towards a holistic communal model of andesite petrogenesis and its role within the broader geochemical cycles of the Earth.
    Type of Medium: Monograph available for loan
    Pages: ix, 414 S. : z.T. farb. Ill., graph. Darst., Kt.
    ISBN: 9781862393691
    Series Statement: Special Publication / Geological Society 385
    URL: http://sp.lyellcollection.org/content/385/1
    Classification:
    Lithosphere
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    Branch Library: GFZ Library
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  • 5
    Electronic Resource
    Electronic Resource
    Plagioclase residence times at two island arc volcanoes (Kameni Islands, Santorini, and Soufriere, St. Vincent) determined by Sr diffusion systematics (1999)
    Springer
    Contributions to mineralogy and petrology 136 (1999), S. 345-357 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The diffusive relaxation of trace element profiles in plagioclase phenocrysts may provide important constraints on magma residence times in crustal magma chambers. Initial trace element profiles in plagioclase phenocrysts are governed by variations in the concentration of a trace element in the melt and by the plagioclase-melt partition coefficient. Trace element diffusion will subsequently act to modify this initial profile and – given enough time – produce a profile that is in equilibrium with the anorthite variations within the crystal. We argue that the trace element partition coefficient Da/b between two parts a and b of a plagioclase crystal of variable anorthite content is equal to the ratio of their crystal-liquid partition coefficients, and that the equilibrium profile of the crystal can be calculated. The time required to establish diffusive equilibrium is dependent on the wavelength and amplitude of the initial trace element concentration range and on the diffusivity of the trace element in plagioclase. Strontium plagioclase-melt partition coefficients and diffusivities are calculated for a range of magmatic temperatures and plagioclase compositions. A one-dimensional diffusion model is developed that describes the diffusive destruction of oscillatory trace element zoning with time and allows the calculation of upper limits for plagioclase crystal residence times in a magma reservoir. The model is tested using major and trace element concentrations measured along crystal traverses of plagioclase phenocrysts from the Kameni Island dacites, Santorini, and from the 1979 Soufriere andesite, St. Vincent. Three out of eight plagioclase phenocrysts have Sr concentration profiles that are not in diffusive equilibrium. For these, the diffusion model is employed to calculate maximum crystal residence times from incomplete diffusive equilibration of trace element zoning in plagioclase. Maximum crystal residence times range from 100 to 450 years. This is in good agreement with estimates from crystal size distribution and from Ra-Th disequilibrium studies for the Kameni Islands. For Soufriere, however, such short residence times are incompatible with U-Th mineral errorchron data that suggest residence times of 〉40 ka in a thermally buffered magma reservoir. To reconcile these apparently different ages, we invoke a more complicated magmatic history for Soufriere where an initially buffered magma reservoir is disturbed by magma mixing and suffers limited additional crystal fractionation prior to eruption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004100050543
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  • 6
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    An introduction to magma dynamics (2008)
    In:  Geological Society Special Publication 304: 1-13.
    Details
    Publication Date: 2008-08-26
    Description: A variety of methods have been employed to decipher magmatic systems, including geophysical, petrological, textural and geochemical approaches, and these elucidate a large variety of characteristics of different plumbing systems and magmatic differentiation processes. A common theme to the papers presented in this book is the observation of transport of small volume magma batches with a relatively high frequency, as opposed to less frequent transport of larger magma volumes that would require storage in large crustal reservoirs for long periods of time. The implications of this observation are discussed in the context of a possible tectonic control on crustal magma dynamics.
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  • 7
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    Some first-order observations on magma transfer from mantle wedge to upper crust at volcanic arcs (2008)
    In:  Geological Society Special Publication 304: 15-31.
    Details
    Publication Date: 2008-08-26
    Description: The viscosity of lavas erupted at volcanic arcs varies over orders of magnitude. A comparison of the relative abundance of viscous lava dome eruptions indicates that the average viscosity of arc lavas also varies considerably between arcs. It is shown that, for continental or transitional arcs with little within-arc crustal deformation and without underlying slab windows or tears, average lava viscosity is anticorrelated with average surface heat flux. The latter may be influenced by crustal thickness and crustal magma throughput. To constrain the relative contributions of these parameters, variations of average lava viscosity with average crustal thickness and plate convergence rate are assessed. While crustal thickness appears to have little effect on average lava viscosity, a good anticorrelation exists between average lava viscosity and plate convergence rate, with the exception of two arcs that show significant intra-arc crustal deformation. If plate convergence rate is a good proxy of the rate of melt generation within the mantle wedge, these first-order observations indicate that, where the rate of mantle melting is high, crustal magma throughput is rapid and efficient, resulting in low-viscosity melts migrating through a hot overriding crust; in contrast, where the rate of mantle melting is low, crustal magma transfer is slow and inefficient, resulting in high-viscosity melts that may frequently stall within a cool overriding crust prior to eruption. Uranium series geochemical evidence from dome lavas is presented and lends support to this interpretation. Finally, some explanations are offered for the observed average viscosity variations of arcs with underlying slab windows or tears and/or significant intra-arc crustal deformation.
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  • 8
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    Three Fe-Ti oxide ore-bearing gabbro-granitoid complexes in the Panxi region of the Permian Emeishan large igneous province, SW China (2011)
    HighWire Press
    Details
    Publication Date: 2011-11-01
    Description: The Permian (~260 Ma) Emeishan large igneous province of SW China contains three nearly identical gabbro-granitoid complexes that host giant Fe-Ti oxide deposits. The Fe-Ti oxide deposits are within the lower portions of evolved layered gabbroic intrusions and are spatially and temporally associated with A-type granitic plutons. The 264 ± 3 Ma Taihe layered gabbroic intrusion hosts a large magmatic Fe-Ti oxide deposit and is coeval with the Taihe peralkaline, A-type granitic pluton, which is dated at 261 ± 2 Ma. Within the A-type granitic pluton are microgranular enclaves, which have compositions intermediate between the gabbro and host granite. Primitive mantle-normalized incompatible element plots show corresponding reciprocal patterns between the mafic and felsic rocks. The chondrite-normalized REE patterns show Eu-anomalies changing from positive (Eu/Eu* = 1.5 to 5.9) in the gabbroic intrusion to negative in the enclaves (Eu/Eu* = 0.4 to 0.6) and granites (Eu/Eu* = 0.2 to 0.5). Whole rock eNd(T) values of the gabbroic intrusion (eNd(T) = +2.5 to +3.3) are similar to those of the enclaves (eNd(T) = +1.0 to 2.0) and granite (eNd(T) = +1.5 to +1.9) whereas the zircon eHf(T) values of the gabbro (eHf(T) = +8.1 ± 0.8) are indistinguishable from those of the granites (eHf(T) = +9.2 ± 1.0), suggesting that the parent magmas for all rock types originated from the same mantle source. Geochemical modeling indicates that the gabbros and granites can be generated by fractional crystallization of a common parental magma similar to high-Ti Emeishan flood basalt. The compositional jump from the gabbro to the enclaves is attributed to the crystallization of Fe-Ti oxide minerals. The results of this study and other studies suggest that the magmatic conditions (for example, pressure, composition, fO2), which led to the formation of at least three Fe-Ti oxide bearing gabbro-granitoid complexes, were relatively common during the development of the Emeishan large igneous province.
    Print ISSN: 0002-9599
    Electronic ISSN: 1945-452X
    Topics: Geosciences
    Published by HighWire Press on behalf of The American Journal of Science.
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  • 9
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    Generation of calc-alkaline andesite of the Tatun volcanic group (Taiwan) within an extensional environment by crystal fractionation (2014)
    Taylor & Francis
    Details
    Publication Date: 2014-06-24
    Print ISSN: 0020-6814
    Electronic ISSN: 1938-2839
    Topics: Geosciences
    Published by Taylor & Francis
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  • 10
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    Editorial (2020)
    Oxford University Press
    Details
    Publication Date: 2020-01-01
    Print ISSN: 0022-3530
    Electronic ISSN: 1460-2415
    Topics: Geosciences
    Published by Oxford University Press
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