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  • 1
    Electronic Resource
    Electronic Resource
    Volcanological and petrological evolution of Nyiragongo volcano, Virunga volcanic field, Zaire (1994)
    Springer
    Bulletin of volcanology 56 (1994), S. 47-61 
    Details
    ISSN: 1432-0819
    Keywords: Nyiragongo ; volcanology ; petrology ; melilitite ; nephelinite ; feldspathoid flotation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Three major phases are distinguished during the growth of Nyiragongo, an active volcano at the western limit of the Virunga Range, Zaire. Lavas erupted during phase 1 are strongly undersaturated melilities characterized by the presence of kalsilite phenocrysts, perovskite, and the abundance of calcite in the matrix. Such lavas crop out mainly on the inner crater wall and progressively evolve toward more aphyric melilite nephelinites well represented on the flanks of the volcano. Adventive vents lying at the base of the cone developed along radial fracture systems and erupted olivine and/or clinopyroxene-rich melilitites or nephelinites. Stage 2 lavas are melilite-free nephelinites. Clinopyroxene is the main phenocryst and feldspathoids are abundant in the lavas exposed on the crater wall. These flows result from periodic overflowing of a magma column from an open crater. Extensive fissure flows which erupted from the base of the cone at the end of this stage are related to widespread draining out of magma which in turn induces the formation of the summit pit crater. Magmas erupted during stage 3 are relatively aphyric melilite nephelinites and the main volcanological characteristic is the permanent lava lake observed into the pit crater until the 1977 eruption. Fluctuations of the level of the lava lake was responsible for the development of the inner terraces. Periodic overflowing of the lava lake from the central pit formed the nepheline aggregate lava flows. Petrography and major element geochemistry allow the determination of the principal petrogenetic processes. Melilitites and nephelinites erupted from the summit crater are lavas derived, via clinopyroxene fractionation, from a more primitive melt. The abundance of feldspathoids in these lavas is in keeping with nepheline flotation. Aphyric melilite nephelinites covering the flanks and the extensive fissure flows have a homogencous chemical composition; rocks from the historical lava lake are slightly more evolved. All these lavas differentiated in a shallow reservoir. Lavas erupted from the parasitic vents are mainly olivine and/or clinopyroxene-phyric rocks. Rushayite and picrites from Muja cone are peculiar high-magnesium lavas resulting from the addition of olivine xenocrysts to melilitic or nephelinitic melts. Fluid and melt inclusions in olivine and clinopyroxene phenocrysts indicate a crystallization depth of 10–14 km. A model involving two reservoirs located at different depths and periodically connected is proposed to explain the petrography of the lavas; this hypothesis is in accordance with geophysical data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279728
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  • 2
    Electronic Resource
    Electronic Resource
    Rhyolite volcanism in the Krafla central volcano, north-east Iceland (1994)
    Springer
    Bulletin of volcanology 56 (1994), S. 516-528 
    Details
    ISSN: 1432-0819
    Keywords: Key words Rhyolite ; petrology ; minimum melts near-solidus fractionation ; mixing ; Krafla ; Iceland
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract At the Krafla central volcano in north-east Iceland, two main phases of rhyolite volcanism are identified. The earlier phase (last interglacial) is related to the formation of a caldera, whereas the second phase (last glacial) is related to the emplacement of a ring dike. Subsequently, only minor amounts of rhyolite have been erupted. The volcanic products of Krafla are volumetrically bimodal. Geochemically, there is a series of basaltic to basalto-andesitic rocks and a cluster of rhyolitic rocks. Rocks of intermediate to silicic composition (icelandites and dacites) show clear signs of mixing. The rhyolites are Fe-rich (tholeiitic), and aphyric to slightly porphyritic (plagioclase, augite, pigeonite, fayalitic olivine and magnetite). They are minimum melts on the quartz–plagioclase cotectic plane in the granite system (Qz–Or–Ab–An). The rhyolites at Krafla were produced by near-solidus, rather than near-liquidus fractionation. They are interpreted as silicic minimum melts of hydrothermally altered crust, mainly of basaltic composition. They were primarily generated on the peripheries of an active basaltic magma chamber or intrusive domain, where sufficient volumes of crust were subjected to temperatures favorable for rhyolite genesis (850–950°  C). The silicic melts were extracted crystal-free from their source in response to crustal deformation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004450050060
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  • 3
    Electronic Resource
    Electronic Resource
    Rhyolite volcanism in the Krafla central volcano, north-east Iceland (1994)
    Springer
    Bulletin of volcanology 56 (1994), S. 516-528 
    Details
    ISSN: 1432-0819
    Keywords: Rhyolite ; petrology ; minimum melts near-solidus fractionation ; mixing ; Krafla ; Iceland
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract At the Krafla central volcano in north-east Iceland, two main phases of rhyolite volcanism are identified. The earlier phase (last interglacial) is related to the formation of a caldera, whereas the second phase (last glacial) is related to the emplacement of a ring dike. Subsequently, only minor amounts of rhyolite have been erupted. The volcanic products of Krafla are volumetrically bimodal. Geochemically, there is a series of basaltic to basalto-andesitic rocks and a cluster of rhyolitic rocks. Rocks of intermediate to silicic composition (icelandites and dacites) show clear signs of mixing. The rhyolites are Fe-rich (tholeiitic), and aphyric to slightly porphyritic (plagioclase, augite, pigeonite, fayalitic olivine and magnetite). They are minimum melts on the quartz-plagioclase cotectic plane in the granite system (Qz-Or-Ab-An). The rhyolites at Krafla were produced by near-solidus, rather than nearliquidus fractionation. They are interpreted as silicic minimum melts of hydrothermally altered crust, mainly of basaltic composition. They were primarily generated on the peripheries of an active basaltic magma chamber or intrusive domain, where sufficient volumes of crust were subjected to temperatures favorable for rhyolite genesis (850–950° C). The silicic melts were extracted crystal-free from their source in response to crustal deformation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302832
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  • 4
    Electronic Resource
    Electronic Resource
    The origin of bathymetric highs at ridge-transform intersections: A multi-disciplinary case study at the Clipperton Fracture Zone (1994)
    Springer
    Marine geophysical researches 16 (1994), S. 1-50 
    Details
    ISSN: 1573-0581
    Keywords: transform fault ; Clipperton Fracture Zone ; mid-ocean ridge ; East Pacific Rise ; petrology ; multichannel seismic reflection ; sea floor photography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Bathmetric highs on the old crust proximal to ridge-transform intersections (RTIs), termed “intersection highs”, are common but poorly understood features at offsets of fast to intermediate rate spreading centers. We have combined new reflection seismic, photographic, and geochemical data with previously published Seabeam, SeaMARC I, and SeaMARC II data to address the nature of the intersection highs at the Clipperton Fracture Zone. The Clipperton Intersection Highs are both topped by a carapace of young lavas at least 100 m thick. These lavas, which were erupted on the intersection highs, are chemically similar to their adjacent ridge segments and different from the surrounding older crust. At least some of the erupted magma traveled directly from the adjacent ridge at a shallow crustal level. Ridge-related magma covers and intrudes at least the upper 500 m of the transform tectonized crust at the RTI. We suspect that additional magma enters the intersection highs from directly below, without passing through the ridge. The young oceanic crust near the western Clipperton RTI is not thin by regional comparison. The 1.4 m.y. old crust near the eastern Clipperton RTI thickens approaching the transform offset. If the thermal effects of the proximal ridge were negligible, the eastern intersection high crust would appear to be in isostatic equilibrium. We believe that thermal effects are significant, and that the intersection high region stands anomalously shallow for its crustal thickness. This is attributable to increased temperature in the mantle below the ridge-proximal crust. Although ridge magma is injected into the proximal old crust, plate boundary reorganization is not taking place. Intersection high formation has been an ongoing process at both of the Clipperton RTIs for at least the past 1 m.y., during which time the plate boundary configuration has not changed appreciably. We envision a constant interplay between the intruding ridge magma and the disrupting transform fault motion. In addition, we envision a nearly constant input of magma from below the high, as an extension of the magma supply to the ridge from the mantle. Because the proximal ridge profoundly affects the juxtaposed crust at the RTI, sea floor fabric along the aseismic extensions of this fast-slipping transform fault is primarily a record of processes at work at the RTI rather than a record of transform tectonism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01812444
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  • 5
    Unknown
    Coal and coal-bearing strata as oil-prone source rocks? (1994)
    London : The Geological Society
    Details
    Keywords: Erdöllagerstätte ; Kohlenlagerstätte ; Kohle ; Erdöl ; Erdölbildung ; Erdölgeologie ; fossile Brennstoffe
    Description / Table of Contents: Andrew J. Fleet and Andrew C. Scott: Coal and coal-bearing strata as oil-prone source rocks: an overview / Geological Society, London, Special Publications, 77:1-8, doi:10.1144/GSL.SP.1994.077.01.01 --- General Studies --- T. G. Powell and C. J. Boreham: Terrestrially sourced oils: where do they exist and what are our limits of knowledge? — a geochemical perspective / Geological Society, London, Special Publications, 77:11-29, doi:10.1144/GSL.SP.1994.077.01.02 --- Margaret E. Collinson, Pim F. Van Bergen, Andrew C. Scott, and Jan W. De Leeuw: The oil-generating potential of plants from coal and coal-bearing strata through time: a review with new evidence from Carboniferous plants / Geological Society, London, Special Publications, 77:31-70, doi:10.1144/GSL.SP.1994.077.01.03 --- R. P. Philp: Geochemical characteristics of oils derived predominantly from terrigenous source materials / Geological Society, London, Special Publications, 77:71-91, doi:10.1144/GSL.SP.1994.077.01.04 --- Scott A. Stout: Chemical heterogeneity among adjacent coal microlithotypes — implications for oil generation and primary migration from humic coal / Geological Society, London, Special Publications, 77:93-106, doi:10.1144/GSL.SP.1994.077.01.05 --- Duncan S. Macgregor: Coal-bearing strata as source rocks — a global overview / Geological Society, London, Special Publications, 77:107-116, doi:10.1144/GSL.SP.1994.077.01.06 --- Case Histories --- S. Thompson, B. S. Cooper, and P. C. Barnard: Some examples and possible explanations for oil generation from coals and coaly sequences / Geological Society, London, Special Publications, 77:119-137, doi:10.1144/GSL.SP.1994.077.01.07 --- C. J. Matchette-Downes, A. E. Fallick, Karmajaya, and S. Rowland: A maturity and palaeoenvironmental assessment of condensates and oils from the North Sumatra Basin, Indonesia / Geological Society, London, Special Publications, 77:139-148, doi:10.1144/GSL.SP.1994.077.01.08 --- David J. Curry, John K. Emmett, and John W. Hunt: Geochemistry of aliphatic-rich coals in the Cooper Basin, Australia and Taranaki Basin, New Zealand: implications for the occurrence of potentially oil-generative coals / Geological Society, London, Special Publications, 77:149-181, doi:10.1144/GSL.SP.1994.077.01.09 --- Mark A. Bagge and Martin L. Keeley: The oil potential of Mid-Jurassic coals in northern Egypt / Geological Society, London, Special Publications, 77:183-200, doi:10.1144/GSL.SP.1994.077.01.10 --- Andrew C. Scott and Andrew J. Fleet: Coal and coal-bearing strata as oil-prone source rocks: current problems and future directions / Geological Society, London, Special Publications, 77:201-205, doi:10.1144/GSL.SP.1994.077.01.11
    Pages: Online-Ressource (213 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 0903317990
    URL: http://sp.lyellcollection.org/content/77/1
    Language: English
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  • 6
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    Unknown
    Elemental yields and complex lithology analysis from the pulsed spectral gamma log (1993)
    Soc. Professional Well Log Analysts
    In:  Transactions of the SPWLA 34th Ann. Logging Symp., Calgary, June 13-16, 1993, vol. 2, paper UU, Bremerhaven, Soc. Professional Well Log Analysts, vol. 10, no. No. 31, pp. 86-121, (ISBN 0 08 042822 3)
    Details
    Publication Date: 1993
    Keywords: Borehole geophys. ; Spectral Gamma Ray log ; petrology
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    BIBLIOGRAPHY SEISMOLOGY
  • 7
    facet.materialart.
    Unknown
    Two-mechanism model for frictional sliding of serpentinite (1992)
    In:  Geophys. Res. Lett., Tübingen, Univ. Calif. Publ., vol. 19, no. 5484, pp. 1535-1538, pp. B05411, (ISSN: 1340-4202)
    Details
    Publication Date: 1992
    Keywords: Friction ; Laboratory measurements ; petrology ; Rock mechanics ; GRL
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    BIBLIOGRAPHY SEISMOLOGY
  • 8
    Electronic Resource
    Electronic Resource
    Analysis of spatial order in sandstones. I. Basic principles (1990)
    Springer
    Mathematical geology 22 (1990), S. 333-359 
    Details
    ISSN: 1573-8868
    Keywords: two-dimensional Fourier transform ; spatial analysis ; petrology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract The spatial arrangement of sedimentary rock components is a fundamental property of sedimentary rocks. If we assume that the size, shape, and composition of sedimentary rock components (mineral grains, pores) carry useful petrologic information, there is no reason to assume that their spatial arrangement does not. Spatial arrangement has been discussed in terms of “texture” and “fabric,” but it has had little objective measurement or classification. This deficiency is primarily due to the difficulties associated with the quantification of spatial phenomena. However, using digital-imaging techniques it is possible to generate petrographic images from thin-sections and quantify the spatial arrangement of selected rock components using a two-dimensional (2D) Fourier transform. A Fourier transform creates a spectral representation of the image similar to an x-ray diffraction pattern. This paper presents the fundamental framework of 2D Fourier analysis in petrology. This type of analysis provides a means to quantify and analyze the spatial arrangement of rock components in an objective, mathematical framework. 2D Fourier power spectra can be used to characterize the type and degree of spatial order in an image, both in terms of the classical concepts of long-range and short-range order and in terms of spatial patterns characteristic of sedimentary rock. The clearly defined mathematical relationship between an image and its Fourier power spectrum provide the opportunity to define the 2D structure of an image in the same manner that x-ray diffraction patterns are used to map 3D structure in minerals. In addition, a 2D Fourier power spectrum is easily transformed into a radial power spectrum. Radial power spectra can be used to characterize the density of objects in an image. They also provide a valid means to compare and contrast images in a multivariate framework, regardless of the type of order. One of the most desirable properties of a Fourier transform is its reversibility. Using selected components of the power spectrum, the inverse transform can be used to build synthetic images, which highlight those petrologic components that most affect the power spectrum. The inverse transform provides the means to translate the results of analysis into meaningful petrologic characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00889892
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  • 9
    Unknown
    Classic Petroleum Provinces (1990)
    London : The Geological Society
    Details
    Keywords: Erdöl ; Erdölgeologie ; Erdöllagerstätte ; Gaz naturel ; Geology ; Natural gas ; Petroleum ; Pétrole
    Description / Table of Contents: Jim Brooks: Classic petroleum provinces / Geological Society, London, Special Publications, 50:1-8, doi:10.1144/GSL.SP.1990.050.01.01 --- K. H. James: The Venezuelan hydrocarbon habitat / Geological Society, London, Special Publications, 50:9-35, doi:10.1144/GSL.SP.1990.050.01.02 --- R. Aymard, L. Pimentel, P. Eitz, P. Lopez, A. Chaouch, J. Navarro, J. Mijares, and J. G. Pereira: Geological integration and evaluation of Northern Monagas, Eastern Venezuelan Basin / Geological Society, London, Special Publications, 50:37-53, doi:10.1144/GSL.SP.1990.050.01.03 --- Nestor Chigne and Leroy Hernandez: Main aspects of petroleum exploration in the Apure area of Southwestern Venezuela, 1985–1987 / Geological Society, London, Special Publications, 50:55-75, doi:10.1144/GSL.SP.1990.050.01.04 --- M. Roberto, L. Mompart, E. Puche, and F. Scherer: New oil discoveries in the Ceuta area, SE Lake Maracaibo, Venezuela / Geological Society, London, Special Publications, 50:77-88, doi:10.1144/GSL.SP.1990.050.01.05 --- M. F. Dashwood and I. L. Abbotts: Aspects of the petroleum geology of the Oriente Basin, Ecuador / Geological Society, London, Special Publications, 50:89-117, doi:10.1144/GSL.SP.1990.050.01.06 --- W. U. Mohriak, M. R. Mello, J. F. Dewey, and J. R. Maxwell: Petroleum geology of the Campos Basin, offshore Brazil / Geological Society, London, Special Publications, 50:119-141, doi:10.1144/GSL.SP.1990.050.01.07 --- Richard J. Hubbard, Steven P. Edrich, and R. Peter Rattey: Geological evolution and hydrocarbon habitat of the ‘Arctic Alaska microplate’ / Geological Society, London, Special Publications, 50:143-187, doi:10.1144/GSL.SP.1990.050.01.08 --- S. Creaney and J. Allan: Hydrocarbon generation and migration in the Western Canada sedimentary basin / Geological Society, London, Special Publications, 50:189-202, doi:10.1144/GSL.SP.1990.050.01.9 --- J. A. Lopez: Structural styles of growth faults in the U.S. Gulf Coast Basin / Geological Society, London, Special Publications, 50:203-219, doi:10.1144/GSL.SP.1990.050.01.10 --- T. G. Fails: The Northern Gulf Coast Basin: a classic petroleum province / Geological Society, London, Special Publications, 50:221-248, doi:10.1144/GSL.SP.1990.050.01.11 --- D. H. Craig: Yates and other Guadalupian (Kazanian) oil fields, U. S. Permian Basin / Geological Society, London, Special Publications, 50:249-263, doi:10.1144/GSL.SP.1990.050.01.12 --- R. Sassen: Geochemistry of carbonate source rocks and crude oils in Jurassic salt basins of the Gulf Coast / Geological Society, London, Special Publications, 50:265-277, doi:10.1144/GSL.SP.1990.050.01.13 --- Moujahed I. Husseini and Sadad I. Husseini: Origin of the Infracambrian Salt Basins of the Middle East / Geological Society, London, Special Publications, 50:279-292, doi:10.1144/GSL.SP.1990.050.01.14 --- R. Stoneley: The Middle East Basin: a summary overview / Geological Society, London, Special Publications, 50:293-298, doi:10.1144/GSL.SP.1990.050.01.15 --- A. S. Alsharhan: Geology and reservoir characteristics of Lower Cretaceous Kharaib Formation in Zakum Field, Abu Dhabi, United Arab Emirates / Geological Society, London, Special Publications, 50:299-316, doi:10.1144/GSL.SP.1990.050.01.16 --- P. J. Grantham, G. W. M. Lijmbach, and J. Posthuma: Geochemistry of crude oils in Oman / Geological Society, London, Special Publications, 50:317-328, doi:10.1144/GSL.SP.1990.050.01.17 --- S. K. Paul: People’s Democratic Republic of Yemen: a future oil province / Geological Society, London, Special Publications, 50:329-339, doi:10.1144/GSL.SP.1990.050.01.18 --- R. Zaki, H. McDowell, I. Threadgold, and O. Oldfield: Sub-salt imaging in the Gulf of Suez / Geological Society, London, Special Publications, 50:341-351, doi:10.1144/GSL.SP.1990.050.01.19 --- H. M. Helmy: Southern Gulf of Suez, Egypt: structural geology of the B-trend oil fields / Geological Society, London, Special Publications, 50:353-363, doi:10.1144/GSL.SP.1990.050.01.20 --- H. Doust: Petroleum geology of the Niger Delta / Geological Society, London, Special Publications, 50:365, doi:10.1144/GSL.SP.1990.050.01.21 --- K. J. Weber: Niger Delta reservoir geology: historical growth of the sedimentological model and its application to field development / Geological Society, London, Special Publications, 50:367, doi:10.1144/GSL.SP.1990.050.01.22 --- M. Sella, C. Turci, and A. Riva: Petroleum geology of the ‘Fossa Bradanica’ (foredeep of the Southern Apennine thrust belt) / Geological Society, London, Special Publications, 50:369-378, doi:10.1144/GSL.SP.1990.050.01.23 --- Dietert Van Der Baan: Zechstein reservoirs in The Netherlands / Geological Society, London, Special Publications, 50:379-398, doi:10.1144/GSL.SP.1990.050.01.24 --- K. W. Glennie and D. M. J. Provan: Lower Permian Rotliegend reservoir of the Southern North Sea gas province / Geological Society, London, Special Publications, 50:399-416, doi:10.1144/GSL.SP.1990.050.01.25 --- A. J. Fraser, D. F. Nash, R. P. Steele, C. C. Ebdon, and A. J. Fraser: A regional assessment of the intra-Carboniferous play of Northern England / Geological Society, London, Special Publications, 50:417-440, doi:10.1144/GSL.SP.1990.050.01.26 --- R. M. Pegrum and A. M. Spencer: Hydrocarbon plays in the northern North Sea / Geological Society, London, Special Publications, 50:441-470, doi:10.1144/GSL.SP.1990.050.01.27 --- O. R. Heum and R. M. Larsen: Haltenbanken hydrocarbon province (off-shore Mid-Norway) / Geological Society, London, Special Publications, 50:471, doi:10.1144/GSL.SP.1990.050.01.28 --- A. E. Kontorovich, M. M. Mandel’Baum, V. S. Surkov, A. A. Trofimuk, and A. N. Zolotov: Lena-Tunguska Upper Proterozoic-Palaeozoic petroleum superprovince / Geological Society, London, Special Publications, 50:473-489, doi:10.1144/GSL.SP.1990.050.01.29 --- I. I. Nesterov, F. K. Salvamanov, A. E. Kontorovich, N. K. Kulakhmetov, V. S. Surkov, A. A. Trofimuk, and V. I. Shpilman: West Siberian oil and gas superprovince / Geological Society, London, Special Publications, 50:491-502, doi:10.1144/GSL.SP.1990.050.01.30 --- P. Dolan: Pakistan: a history of petroleum exploration and future potential / Geological Society, London, Special Publications, 50:503-524, doi:10.1144/GSL.SP.1990.050.01.31 --- V. D. Rahmanian, P. S. Moore, W. J. Mudge, and D. E. Spring: Sequence stratigraphy and the habitat of hydrocarbons, Gippsland Basin, Australia / Geological Society, London, Special Publications, 50:525-544, doi:10.1144/GSL.SP.1990.050.01.32 --- S. R. Lawrence: Aspects of the petroleum geology of the Junggar Basin, Northwest China / Geological Society, London, Special Publications, 50:545-557, doi:10.1144/GSL.SP.1990.050.01.33
    Pages: Online-Ressource (V, 570 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 0903317486
    URL: http://sp.lyellcollection.org/content/50/1
    Language: English
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