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  • Age; AGE; Boron-11/Boron-10 ratio; boron isotopes; calcification; COC; Coral; Coral core; Density; DISTANCE; Geochemistry; Linear extension; LIZ13_1; Lizard Island, northern Great Barrier Reef; Month; Ocean acidification; Porites; Porites australiensis, Boron/Calcium ratio; Porites australiensis, Strontium/Calcium ratio; Years  (3)
  • 01. Atmosphere::01.03. Magnetosphere::01.03.03. Magnetospheric physics  (2)
  • 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics  (2)
  • American Geophysical Union  (4)
  • PANGAEA  (3)
  • Copernicus
  • Nature Publishing Group
  • 2015-2019  (7)
  • 1980-1984
  • 1935-1939
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Schlagwörter
Verlag/Herausgeber
Erscheinungszeitraum
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  • 1
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    The protracted development of focused magmatic intrusion during continental rifting (2015)
    American Geophysical Union
    Details
    Publikationsdatum: 2021-06-25
    Beschreibung: The transition from mechanical thinning toward focused magmatic intrusion during continental rifting is poorly constrained; the tectonically active Main Ethiopian Rift (MER) provides an ideal study locale to address this issue. The presence of linear magmatic-tectonic belts in the relatively immature central MER may indicate that the transition from mechanical to magmatic rifting is more spatially distributed and temporally protracted than has previously been assumed. Here we examine lava geochemistry and vent distribution of a Pliocene-Quaternary linear magmatic chain along the western margin of the central MER—the Akaki Magmatic Zone. Our results show limited variability in parental magma that evolve in a complex polybaric fractionation system that has not changed significantly over the past 3 Ma. Our results suggest the following: (1) channeling of plume material and the localization of shear- or topography-induced porosity modulates melt intrusion into the continental lithosphere. (2) Pre-existing lithospheric structures may act as catalysts for intrusion of magmas into the lithospheric mantle. (3) The midcrustal to upper crustal strain regime dictates the surface orientation of volcanic vents. Therefore, although linear magmatic belts like those in the central MER may young progressively toward the rift axis and superficially resemble oceanic style magmatism, they actually represent prebreakup magmatism on continental crust. The oldest linear magmatic belts observed seismically and magnetically at the edge of the ocean basins thus may not, as is often assumed, actually mark the onset of seafloor spreading.
    Beschreibung: Published
    Beschreibung: 875–897
    Beschreibung: 1T. Geodinamica e interno della Terra
    Beschreibung: JCR Journal
    Beschreibung: restricted
    Schlagwort(e): Precambrian lineaments control off-axis melt • Magmatic extension in Ethiopian rift is not ocean like • Magmatic belts at basins margins may not be seafloor spreading ; 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OA)
  • 2
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    The origin of along-rift variations in faulting and magmatism in the Ethiopian Rift (2015)
    American Geophysical Union
    Details
    Publikationsdatum: 2021-06-25
    Beschreibung: The geological record at rifts and margins worldwide often reveals considerable along-strike variations in volumes of extruded and intruded igneous rocks. These variations may be the result of asthenospheric heterogeneity, variations in rate, and timing of extension; alternatively, preexisting plate architecture and/or the evolving kinematics of extension during breakup may exert first-order control on magmatism. The Main Ethiopian Rift (MER) in East Africa provides an excellent opportunity to address this dichotomy: it exposes, along strike, several sectors of asynchronous rift development from continental rifting in the south to incipient oceanic spreading in the north. Here we perform studies of volcanic cone density and rift obliquity along strike in the MER. By synthesizing these new data in light of existing geophysical, geochemical, and petrological constraints on magma generation and emplacement, we are able to discriminate between tectonic and mantle geodynamic controls on the geological record of a newly forming magmatic rifted margin. The timing of rift sector development, the three-dimensional focusing of melt, and the ponding of plume material where the rift dramatically narrows each influence igneous intrusion and volcanism along the MER. However, rifting obliquity plays an important role in localizing intrusion into the crust beneath en echelon volcanic segments. Along-strike variations in volumes and types of igneous rocks found at rifted margins thus likely carry information about the development of strain during rifting, as well as the physical state of the convecting mantle at the time of breakup.
    Beschreibung: Published
    Beschreibung: 467-477
    Beschreibung: 1T. Geodinamica e interno della Terra
    Beschreibung: JCR Journal
    Beschreibung: restricted
    Schlagwort(e): Variationsinmeltproductioncausedby asynchronous rift sector development • Where the rift narrows, ponding of plume material may enhance melting • Three-dimensional migration of melt along the LAB focuses magma supply ; 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OA)
  • 3
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    Monthly proxy and growth parameter from a core of Porites australiensis from Lizard Island, 1994-06 - 2018-08 (2019)
    PANGAEA
    Details
    Publikationsdatum: 2023-02-12
    Schlagwort(e): Age; AGE; Boron-11/Boron-10 ratio; boron isotopes; calcification; COC; Coral; Coral core; Density; DISTANCE; Geochemistry; Linear extension; LIZ13_1; Lizard Island, northern Great Barrier Reef; Month; Ocean acidification; Porites; Porites australiensis, Boron/Calcium ratio; Porites australiensis, Strontium/Calcium ratio; Years
    Materialart: Dataset
    Format: text/tab-separated-values, 928 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 4
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    Monthly proxy and growth parameter from a core of Porites australiensis from Lizard Island, 1973-06 - 1983-02 (2019)
    PANGAEA
    Details
    Publikationsdatum: 2023-02-12
    Schlagwort(e): Age; AGE; Boron-11/Boron-10 ratio; boron isotopes; calcification; COC; Coral; Coral core; Density; DISTANCE; Geochemistry; Linear extension; LIZ13_1; Lizard Island, northern Great Barrier Reef; Month; Ocean acidification; Porites; Porites australiensis, Boron/Calcium ratio; Porites australiensis, Strontium/Calcium ratio; Years
    Materialart: Dataset
    Format: text/tab-separated-values, 472 data points
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    DATEN PANGAEA
  • 5
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    Monthly proxy and growth parameter from a core of Porites australiensis from Lizard Island, 1938-12 - 1944-02 (2019)
    PANGAEA
    Details
    Publikationsdatum: 2023-02-12
    Schlagwort(e): Age; AGE; Boron-11/Boron-10 ratio; boron isotopes; calcification; COC; Coral; Coral core; Density; DISTANCE; Geochemistry; Linear extension; LIZ13_1; Lizard Island, northern Great Barrier Reef; Month; Ocean acidification; Porites; Porites australiensis, Boron/Calcium ratio; Porites australiensis, Strontium/Calcium ratio; Years
    Materialart: Dataset
    Format: text/tab-separated-values, 256 data points
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    DATEN PANGAEA
  • 6
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    A statistical analysis of low-frequency magnetic pulsations at cusp and cap latitudes in Antarctica (2015)
    American Geophysical Union
    Details
    Publikationsdatum: 2017-04-04
    Beschreibung: We report a statistical analysis of low-frequency magnetic variations (magnetic pulsations, 0.8–7 mHz) at South Pole (74 S corrected geomagnetic latitude) and Terra Nova Bay (80 S) during 1996. The results show that at South Pole (at cusp latitudes) the pulsation power exhibits two maxima during the day, one in the local premidnight and the other in the morning. The first maximum disappears when the analysis is restricted to northward interplanetary magnetic field conditions (Bz 〉 1 nT), suggesting that it might be associated to substorm phenomena. During closed magnetospheric conditions, when the cusp is expected to be located poleward with respect to the station, the spectral and polarization characteristics of pulsations between 1 and 3 mHz suggest that resonant oscillations of the outermost closed field lines commonly occur at South Pole in the local morning. At Terra Nova Bay, in the polar cap, the pulsation power is much lower and its diurnal variation is characterized by a single maximum, which occurs around local noon, when the station approaches the cusp. The corresponding polarization pattern indicates that Terra Nova Bay is always located poleward with respect to resonant field lines.
    Beschreibung: Published
    Beschreibung: A02205
    Beschreibung: 1A. Geomagnetismo e Paleomagnetismo
    Beschreibung: JCR Journal
    Beschreibung: restricted
    Schlagwort(e): geomagnetic pulsations ; magnetospheric dynamics ; 01. Atmosphere::01.03. Magnetosphere::01.03.03. Magnetospheric physics
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OA)
  • 7
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    Formation of ionospheric irregularities over Southeast Asia during the 2015 St. Patrickˈs Day storm (2017)
    American Geophysical Union
    Details
    Publikationsdatum: 2022-11-23
    Beschreibung: We investigate the geospace response to the 2015 St. Patrickˈs Day storm leveraging on instruments spread over Southeast Asia (SEA), covering a wide longitudinal sector of the low-latitude ionosphere. A regional characterization of the storm is provided, identifying the peculiarities of ionospheric irregularity formation. The novelties of this work are the characterization in a broad longitudinal range and the methodology relying on the integration of data acquired by Global Navigation Satellite System (GNSS) receivers, magnetometers, ionosondes, and Swarm satellites. This work is a legacy of the project EquatoRial Ionosphere Characterization in Asia (ERICA). ERICA aimed to capture the features of both crests of the equatorial ionospheric anomaly (EIA) and trough (EIT) by means of a dedicated measurement campaign. The campaign lasted from March to October 2015 and was able to observe the ionospheric variability causing effects on radio systems, GNSS in particular. The multiinstrumental and multiparametric observations of the region enabled an in-depth investigation of the response to the largest geomagnetic storm of the current solar cycle in a region scarcely reported in literature. Our work discusses the comparison between northern and southern crests of the EIA in the SEA region. The observations recorded positive and negative ionospheric storms, spread F conditions, scintillation enhancement and inhibition, and total electron content variability. The ancillary information on the local magnetic field highlights the variety of ionospheric perturbations during the different storm phases. The combined use of ionospheric bottomside, topside, and integrated information points out how the storm affects the F layer altitude and the consequent enhancement/suppression of scintillations.
    Beschreibung: Published
    Beschreibung: 12211–12233
    Beschreibung: 1A. Geomagnetismo e Paleomagnetismo
    Beschreibung: 2A. Fisica dell'alta atmosfera
    Beschreibung: 1IT. Reti di monitoraggio e Osservazioni
    Beschreibung: 5IT. Osservazioni satellitari
    Beschreibung: JCR Journal
    Beschreibung: open
    Schlagwort(e): Saint Patrickˈs Day storm ; scintillation enhancement/suppression ; equatorial ionospheric anomaly ; positive and negative ionospheric storms ; spread F ; total electron content variability ; 01. Atmosphere::01.02. Ionosphere::01.02.99. General or miscellaneous ; 01. Atmosphere::01.02. Ionosphere::01.02.02. Dynamics ; 01. Atmosphere::01.02. Ionosphere::01.02.04. Plasma Physics ; 01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation ; 01. Atmosphere::01.02. Ionosphere::01.02.06. Instruments and techniques ; 01. Atmosphere::01.02. Ionosphere::01.02.07. Scintillations ; 01. Atmosphere::01.03. Magnetosphere::01.03.99. General or miscellaneous ; 01. Atmosphere::01.03. Magnetosphere::01.03.02. Magnetic storms ; 01. Atmosphere::01.03. Magnetosphere::01.03.03. Magnetospheric physics
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OA)
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