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  • 1
    Monograph available for loan
    Monograph available for loan
    Oxford [u.a.] : Blackwell
    Associated volumes
    Call number: 9/M 92.1246
    In: Geological Society special publication
    Description / Table of Contents: The ocean basins provide a unique opportunity to investigate magmatic processes and mantle composition. The absence of continental crust as a potential contaminant provides an untarnished sample of the deep earth although a full understanding of the messages carried in the sample is still far away. In 1987, a meeting was convened by The Geological Society at Leicester University to review recent advances and research, and this volume contains nineteen of the papers presented at the meeting. The volume is intended primarily for research workers and final-year undergraduate students specializing in igneous petrology and geochemistry. The papers represent aspects of ocean basin magmatism not previously collected within one cover, and many of them are state-of-theart studies of this highly topical subject, which is now being further explored by the OceanDrilling Program.
    Type of Medium: Monograph available for loan
    Pages: VIII, 398 S. , Ill., graph. Darst., Kt.
    ISBN: 0632023848
    Series Statement: Geological Society special publication 42
    Classification:
    Petrology, Petrography
    Language: English
    Note: A. D. Saunders and M. J. Norry: Introduction / Geological Society, London, Special Publications, 42:vii-viii, doi:10.1144/GSL.SP.1989.042.01.01 --- I. G. Gass: Magmatic processes at and near constructive plate margins as deduced from the Troodos (Cyprus) and Semail Nappe (N Oman) ophiolites / Geological Society, London, Special Publications, 42:1-15, doi:10.1144/GSL.SP.1989.042.01.02 --- Robert S. White: Asthenospheric control on magmatism in the ocean basins / Geological Society, London, Special Publications, 42:17-27, doi:10.1144/GSL.SP.1989.042.01.03 --- John G. Spray: Upper mantle segregation processes: evidence from alpine-type peridotites / Geological Society, London, Special Publications, 42:29-40, doi:10.1144/GSL.SP.1989.042.01.04 --- James H. Natland: Partial melting of a lithologically heterogeneous mantle: inferences from crystallization histories of magnesian abyssal tholeiites from the Siqueiros Fracture Zone / Geological Society, London, Special Publications, 42:41-70, doi:10.1144/GSL.SP.1989.042.01.05 --- H. J. B. Dick: Abyssal peridotites, very slow spreading ridges and ocean ridge magmatism / Geological Society, London, Special Publications, 42:71-105, doi:10.1144/GSL.SP.1989.042.01.06 --- Sherman H. Bloomer, James H. Natland, and Robert L. Fisher: Mineral relationships in gabbroic rocks from fracture zones of Indian Ocean ridges: evidence for extensive fractionation, parental diversity and boundary-layer recrystallization / Geological Society, London, Special Publications, 42:107-124, doi:10.1144/GSL.SP.1989.042.01.07 --- Don Elthon: Pressure of origin of primary mid-ocean ridge basalts / Geological Society, London, Special Publications, 42:125-136, doi:10.1144/GSL.SP.1989.042.01.08 --- Toshitsugu Fujii: Genesis of mid-ocean ridge basalts / Geological Society, London, Special Publications, 42:137-146, doi:10.1144/GSL.SP.1989.042.01.09 --- Z. A. Palacz and J. A. Wolff: Strontium, neodymium and lead isotope characteristics of the Granadilla Pumice, Tenerife: a study of the causes of strontium isotope disequilibrium in felsic pyroclastic deposits / Geological Society, London, Special Publications, 42:147-159, doi:10.1144/GSL.SP.1989.042.01.10 --- M. Storey, J. A. Wolff, M. J. Norry, and G. F. Marriner: Origin of hybrid lavas from Agua de Pau volcano, Sao Miguel, Azores / Geological Society, London, Special Publications, 42:161-180, doi:10.1144/GSL.SP.1989.042.01.11 --- G. Thompson, W. B. Bryan, and S. E. Humphris: Axial volcanism on the East Pacific Rise, 10–12°N / Geological Society, London, Special Publications, 42:181-200, doi:10.1144/GSL.SP.1989.042.01.12 --- Johann Helgason: The Fjallgardar volcanic ridge in NE Iceland: an aborted early stage plate boundary or a volcanically dormant zone? / Geological Society, London, Special Publications, 42:201-213, doi:10.1144/GSL.SP.1989.042.01.13 --- P. A. Floyd: Geochemical features of intraplate oceanic plateau basalts / Geological Society, London, Special Publications, 42:215-230, doi:10.1144/GSL.SP.1989.042.01.14 --- G. R. Davies, R. A. Cliff, M. J. Norry, and D. C. Gerlach: A combined chemical and Pb-Sr-Nd isotope study of the Azores and Cape Verde hot-spots: the geodynamic implications / Geological Society, London, Special Publications, 42:231-255, doi:10.1144/GSL.SP.1989.042.01.15 --- D. J. Chaffey, R. A. Cliff, and B. M. Wilson: Characterization of the St Helena magma source / Geological Society, London, Special Publications, 42:257-276, doi:10.1144/GSL.SP.1989.042.01.16 --- J.-L. Joron and M. Treuil: Hygromagmaphile element distributions in oceanic basalts as fingerprints of partial melting and mantle heterogeneities: a specific approach and proposal of an identification and modelling method / Geological Society, London, Special Publications, 42:277-299, doi:10.1144/GSL.SP.1989.042.01.17 --- D. E. Fisher: Evaluation of rare gas data in relation to oceanic magmas / Geological Society, London, Special Publications, 42:301-311, doi:10.1144/GSL.SP.1989.042.01.18 --- S.-s. Sun and W. F. McDonough: Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes / Geological Society, London, Special Publications, 42:313-345, doi:10.1144/GSL.SP.1989.042.01.19 --- B. J. Murton: Tectonic controls on boninite genesis / Geological Society, London, Special Publications, 42:347-377, doi:10.1144/GSL.SP.1989.042.01.20
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Unknown
    Oxford, London, Edinburgh, Boston, Melbourne : Blackwell Scientific Publications
    Keywords: Meeresboden ; Magmatismus ; Magmas ; Magmatism ; Mantle ; Ocean bottom ; Ophiolites ; Submarine geology
    Description / Table of Contents: A. D. Saunders and M. J. Norry: Introduction / Geological Society, London, Special Publications, 42:vii-viii, doi:10.1144/GSL.SP.1989.042.01.01 --- I. G. Gass: Magmatic processes at and near constructive plate margins as deduced from the Troodos (Cyprus) and Semail Nappe (N Oman) ophiolites / Geological Society, London, Special Publications, 42:1-15, doi:10.1144/GSL.SP.1989.042.01.02 --- Robert S. White: Asthenospheric control on magmatism in the ocean basins / Geological Society, London, Special Publications, 42:17-27, doi:10.1144/GSL.SP.1989.042.01.03 --- John G. Spray: Upper mantle segregation processes: evidence from alpine-type peridotites / Geological Society, London, Special Publications, 42:29-40, doi:10.1144/GSL.SP.1989.042.01.04 --- James H. Natland: Partial melting of a lithologically heterogeneous mantle: inferences from crystallization histories of magnesian abyssal tholeiites from the Siqueiros Fracture Zone / Geological Society, London, Special Publications, 42:41-70, doi:10.1144/GSL.SP.1989.042.01.05 --- H. J. B. Dick: Abyssal peridotites, very slow spreading ridges and ocean ridge magmatism / Geological Society, London, Special Publications, 42:71-105, doi:10.1144/GSL.SP.1989.042.01.06 --- Sherman H. Bloomer, James H. Natland, and Robert L. Fisher: Mineral relationships in gabbroic rocks from fracture zones of Indian Ocean ridges: evidence for extensive fractionation, parental diversity and boundary-layer recrystallization / Geological Society, London, Special Publications, 42:107-124, doi:10.1144/GSL.SP.1989.042.01.07 --- Don Elthon: Pressure of origin of primary mid-ocean ridge basalts / Geological Society, London, Special Publications, 42:125-136, doi:10.1144/GSL.SP.1989.042.01.08 --- Toshitsugu Fujii: Genesis of mid-ocean ridge basalts / Geological Society, London, Special Publications, 42:137-146, doi:10.1144/GSL.SP.1989.042.01.09 --- Z. A. Palacz and J. A. Wolff: Strontium, neodymium and lead isotope characteristics of the Granadilla Pumice, Tenerife: a study of the causes of strontium isotope disequilibrium in felsic pyroclastic deposits / Geological Society, London, Special Publications, 42:147-159, doi:10.1144/GSL.SP.1989.042.01.10 --- M. Storey, J. A. Wolff, M. J. Norry, and G. F. Marriner: Origin of hybrid lavas from Agua de Pau volcano, Sao Miguel, Azores / Geological Society, London, Special Publications, 42:161-180, doi:10.1144/GSL.SP.1989.042.01.11 --- G. Thompson, W. B. Bryan, and S. E. Humphris: Axial volcanism on the East Pacific Rise, 10–12°N / Geological Society, London, Special Publications, 42:181-200, doi:10.1144/GSL.SP.1989.042.01.12 --- Johann Helgason: The Fjallgardar volcanic ridge in NE Iceland: an aborted early stage plate boundary or a volcanically dormant zone? / Geological Society, London, Special Publications, 42:201-213, doi:10.1144/GSL.SP.1989.042.01.13 --- P. A. Floyd: Geochemical features of intraplate oceanic plateau basalts / Geological Society, London, Special Publications, 42:215-230, doi:10.1144/GSL.SP.1989.042.01.14 --- G. R. Davies, R. A. Cliff, M. J. Norry, and D. C. Gerlach: A combined chemical and Pb-Sr-Nd isotope study of the Azores and Cape Verde hot-spots: the geodynamic implications / Geological Society, London, Special Publications, 42:231-255, doi:10.1144/GSL.SP.1989.042.01.15 --- D. J. Chaffey, R. A. Cliff, and B. M. Wilson: Characterization of the St Helena magma source / Geological Society, London, Special Publications, 42:257-276, doi:10.1144/GSL.SP.1989.042.01.16 --- J.-L. Joron and M. Treuil: Hygromagmaphile element distributions in oceanic basalts as fingerprints of partial melting and mantle heterogeneities: a specific approach and proposal of an identification and modelling method / Geological Society, London, Special Publications, 42:277-299, doi:10.1144/GSL.SP.1989.042.01.17 --- D. E. Fisher: Evaluation of rare gas data in relation to oceanic magmas / Geological Society, London, Special Publications, 42:301-311, doi:10.1144/GSL.SP.1989.042.01.18 --- S.-s. Sun and W. F. McDonough: Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes / Geological Society, London, Special Publications, 42:313-345, doi:10.1144/GSL.SP.1989.042.01.19 --- B. J. Murton: Tectonic controls on boninite genesis / Geological Society, London, Special Publications, 42:347-377, doi:10.1144/GSL.SP.1989.042.01.20
    Pages: Online-Ressource (VIII, 398 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 0632023848
    Language: English
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  • 3
    Publication Date: 2015-05-13
    Description: Organic Letters DOI: 10.1021/acs.orglett.5b01203
    Print ISSN: 1523-7060
    Electronic ISSN: 1523-7052
    Topics: Chemistry and Pharmacology
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  • 4
    Publication Date: 2015-10-13
    Description: Organic Letters DOI: 10.1021/acs.orglett.5b02788
    Print ISSN: 1523-7060
    Electronic ISSN: 1523-7052
    Topics: Chemistry and Pharmacology
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  • 5
    Publication Date: 2016-09-02
    Description: Motivation : The CRISPR-Cas system is an adaptive immune system in many archaea and bacteria, which provides resistance against invading genetic elements. The first phase of CRISPR-Cas immunity is called adaptation, in which small DNA fragments are excised from genetic elements and are inserted into a CRISPR array generally adjacent to its so called leader sequence at one end of the array. It has been shown that transcription initiation and adaptation signals of the CRISPR array are located within the leader. However, apart from promoters, there is very little knowledge of sequence or structural motifs or their possible functions. Leader properties have mainly been characterized through transcriptional initiation data from single organisms but large-scale characterization of leaders has remained challenging due to their low level of sequence conservation. Results : We developed a method to successfully detect leader sequences by focusing on the consensus repeat of the adjacent CRISPR array and weak upstream conservation signals. We applied our tool to the analysis of a comprehensive genomic database and identified several characteristic properties of leader sequences specific to archaea and bacteria, ranging from distinctive sizes to preferential indel localization. CRISPRleader provides a full annotation of the CRISPR array, its strand orientation as well as conserved core leader boundaries that can be uploaded to any genome browser. In addition, it outputs reader-friendly HTML pages for conserved leader clusters from our database. Availability and Implementation: CRISPRleader and multiple sequence alignments for all 195 leader clusters are available at http://www.bioinf.uni-freiburg.de/Software/CRISPRleader/ . Contact: costa@informatik.uni-freiburg.de or backofen@informatik.uni-freiburg.de Supplementary information: Supplementary data are available at Bioinformatics online.
    Print ISSN: 1367-4803
    Electronic ISSN: 1460-2059
    Topics: Biology , Computer Science , Medicine
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  • 6
    Publication Date: 2016-01-28
    Description: Albian carbonate reservoirs are prominent in the subsurface of the South Atlantic. Equivalent exposures in southern Angola (Benguela and Namibe basins) have received relatively little detailed sedimentological work. In the Namibe Basin, carbonates form metre-thick beds interbedded with shallow-marine and continental alluvial fan siliciclastics. Characteristic carbonate mounds (≤5 m high, 1–2 m in diameter) rise above a basal carbonate bed, which consists of oncoid–peloidal rud-grainstones with oysters and echinoderms. Thrombolite mound microfacies include red algae and microbial–algal crusts. The microfacies are marine, and compare with documented occurrences of algal–microbial–oncoidal textures in Albian carbonates of the Congo and Angola. Burial processes dominated diagenesis and have reset carbonate geochemistry from marine values, with the probable exception of Mg concentrations. Up to 22% of primary (intergranular) and secondary (microporosity, mouldic, vuggy, fracture) porosity developed as a consequence of important dissolution and partial cementation. Two depositional models for the localized mound occurrence are discussed: (1) marine ingression into a coastal embayment and the formation of shallow-water microbial bioherms; and (2) a submarine groundwater spring discharging in coastal areas downdip from alluvial siliciclastics. Marine fauna, similarity with marine Albian strata elsewhere and a partly preserved marine Mg geochemical signature favour a marine ingression. Environmental conditions were likely to have been stressed on account of the siliciclastic input, variable salinity and elevated nutrients, all of which are consistent with the observed microfacies. A submarine spring is conceptually feasible, but is considered to be less likely owing to the absence of a clear meteoric signature and the low likelihood of bicarbonate-rich groundwater in the region. Using the discussion of depositional models for the studied outcrop, and incorporating a literature review, the study proposes a set of criteria to distinguish various marine and non-marine carbonate mounds in the subsurface. The most diagnostic criteria are: (1) marine or continental fauna; (2) sediment geochemistry, in particular Mg, Sr, and 13 C and 18 O isotopes where preserved through diagenesis; and (3) carbonate fabrics, such as crystalline shrubs, that are diagnostic of thermogenic continental mounds. The scale of geobodies and the mineralogy of mounds can sometimes be used as additional criteria. This set of criteria can help exploration and production geologists who need to devise exploration and development strategies in unconventional carbonate reservoirs of the South Atlantic and other rift basins.
    Print ISSN: 1354-0793
    Topics: Chemistry and Pharmacology , Geosciences
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  • 7
    Publication Date: 2016-01-15
    Description: Flash radiography with 800 MeV kinetic energy protons at Los Alamos National Laboratory is an important experimental tool for investigations of dynamic material behavior driven by high explosives or pulsed power. The extraction of quantitative information about density fields in a dynamic experiment from proton generated images requires a high fidelity model of the proton imaging process. It is shown that accurate calculations of the transmission through the magnetic lens system require terms beyond second order for protons far from the tune energy. The approach used integrates the correlated multiple Coulomb scattering distribution simultaneously over the collimator and the image plane. Comparison with a series of static calibration images demonstrates the model’s accurate reproduction of both the transmission and blur over a wide range of tune energies in an inverse identity lens that consists of four quadrupole electromagnets.
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
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  • 8
    Publication Date: 2014-08-27
    Description: Motivation : The discovery of CRISPR-Cas systems almost 20 years ago rapidly changed our perception of the bacterial and archaeal immune systems. CRISPR loci consist of several repetitive DNA sequences called repeats, inter-spaced by stretches of variable length sequences called spacers. This CRISPR array is transcribed and processed into multiple mature RNA species (crRNAs). A single crRNA is integrated into an interference complex, together with CRISPR-associated (Cas) proteins, to bind and degrade invading nucleic acids. Although existing bioinformatics tools can recognize CRISPR loci by their characteristic repeat-spacer architecture, they generally output CRISPR arrays of ambiguous orientation and thus do not determine the strand from which crRNAs are processed. Knowledge of the correct orientation is crucial for many tasks, including the classification of CRISPR conservation, the detection of leader regions, the identification of target sites (protospacers) on invading genetic elements and the characterization of protospacer-adjacent motifs. Results : We present a fast and accurate tool to determine the crRNA-encoding strand at CRISPR loci by predicting the correct orientation of repeats based on an advanced machine learning approach. Both the repeat sequence and mutation information were encoded and processed by an efficient graph kernel to learn higher-order correlations. The model was trained and tested on curated data comprising 〉4500 CRISPRs and yielded a remarkable performance of 0.95 AUC ROC (area under the curve of the receiver operator characteristic). In addition, we show that accurate orientation information greatly improved detection of conserved repeat sequence families and structure motifs. We integrated CRISPRstrand predictions into our CRISPRmap web server of CRISPR conservation and updated the latter to version 2.0. Availability : CRISPRmap and CRISPRstrand are available at http://rna.informatik.uni-freiburg.de/CRISPRmap . Contact : backofen@informatik.uni-freiburg.de Supplementary information: Supplementary data are available at Bioinformatics online.
    Print ISSN: 1367-4803
    Electronic ISSN: 1460-2059
    Topics: Biology , Computer Science , Medicine
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  • 9
    Publication Date: 2014-05-03
    Description: We observed the cluster CIZA J2242.8+5301 with the Arcminute Microkelvin Imager at 16 GHz and present the first high radio-frequency detection of diffuse, non-thermal cluster emission. This cluster hosts a variety of bright, extended, steep-spectrum synchrotron-emitting radio sources, associated with the intracluster medium, called radio relics. Most notably, the northern, Mpc-wide, narrow relic provides strong evidence for diffusive shock acceleration in clusters. We detect a puzzling, flat-spectrum, diffuse extension of the southern relic, which is not visible in the lower radio-frequency maps. The northern radio relic is unequivocally detected and measures an integrated flux of 1.2 ± 0.3 mJy. While the low-frequency (〈2 GHz) spectrum of the northern relic is well represented by a power law, it clearly steepens towards 16 GHz. This result is inconsistent with diffusive shock acceleration predictions of ageing plasma behind a uniform shock front. The steepening could be caused by an inhomogeneous medium with temperature/density gradients or by lower acceleration efficiencies of high energy electrons. Further modelling is necessary to explain the observed spectrum.
    Print ISSN: 1745-3925
    Electronic ISSN: 1745-3933
    Topics: Physics
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  • 10
    Publication Date: 2014-04-06
    Description: We present one of the best sampled early-time light curves of a gamma-ray burst (GRB) at radio wavelengths. Using the Arcminute Mircrokelvin Imager (AMI), we observed GRB 130427A at the central frequency of 15.7 GHz between 0.36 and 59.32 d post-burst. These results yield one of the earliest radio detections of a GRB and demonstrate a clear rise in flux less than one day after the -ray trigger followed by a rapid decline. This early-time radio emission probably originates in the GRB reverse shock so our AMI light curve reveals the first ever confirmed detection of a reverse shock peak in the radio domain. At later times (about 3.2 d post-burst), the rate of decline decreases, indicating that the forward shock component has begun to dominate the light curve. Comparisons of the AMI light curve with modelling conducted by Perley et al. show that the most likely explanation of the early-time 15.7 GHz peak is caused by the self-absorption turn-over frequency, rather than the peak frequency, of the reverse shock moving through the observing bands.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
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