Jurassic magnetic stratigraphy from Umbrian (Italian) land sections

Channell, James E T; Lowrie, William; Pialli, P.; Venturi, Federico

doi:10.1016/0012-821x(84)90162-6

Cited by 39 publications

(7 citation statements)

References 16 publications

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“…Magnetostratigraphic studies from condensed pelagic limestones at Bakonycsernye (Márton et al, 1980), Fonte Avellana and Cingoli (Channell et al,1984) show a dominance of reverse polarity across the Sinemurian-Pliensbachian boundary, in stark contrast to results presented here. This may be because the chronostratigraphy in these sections has both poor biostratigraphic control and hiatuses in the thin pelagic limestone successions may be frequent, as suggested by Opdyke and Channel (1996).…”

Section: And the Late Sinemurian Succession In The Montcornetcontrasting

confidence: 99%

The Global Boundary Stratotype Section and Point (GSSP) for the base of the Pliensbachian Stage (Lower Jurassic), Wine Haven, Yorkshire, UK

Meister¹,

Aberhan²,

Blau³

et al. 2006

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Section: And the Late Sinemurian Succession In The Montcornetcontrasting

confidence: 99%

The Global Boundary Stratotype Section and Point (GSSP) for the base of the Pliensbachian Stage (Lower Jurassic), Wine Haven, Yorkshire, UK

Meister¹,

Aberhan²,

Blau³

et al. 2006

Episodes

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“…Sedimentation began in the Triassic as volcanic and coarse-grained continental deposits, and from the Late Triassic onwards a narrow marine corridor settled in the northern area of the basin. This sea expanded Fonte Avellana: [38]. GAOHVTH 94: [1]; O 95: [2,3].…”

Section: Geological Setting and Sampling Methodologymentioning

confidence: 99%

The Neuquén composite section: magnetostratigraphy and biostratigraphy of the marine lower Jurassic from the Neuquén basin (Argentina)

Llanos

Riccardi

2000

Earth and Planetary Science Letters

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Paleomagnetic and biostratigraphic data from five marine sedimentary sections in the Argentine Neuquën basin have allowed to construct the Lower Jurassic Neuquën Composite Section. This composite section comprises 14 reversed and 11 normal polarity Zones, in relation to 17 Andean ammonite Assemblage Zones, spanning the Hettangian^Toarcian (Early Jurassic). It represents the first paleomagnetic data of Lower Jurassic marine successions in the Southern Hemisphere. The Neuquën composite Section was correlated to the International Mesozoic Polarity Time Scale which, for the Lower Jurassic, comprises 54 polarity Zones and 16 Standard ammonite Zones. The correlation between the regional and the international biomagnetostratigraphic scales supports but also refines the correlation between the Andean and Standard ammonite zonations. Correlation between the Neuquën composite Section and the polarity sequences recorded in each section helped to assign several unfossiliferous stratigraphical levels to the corresponding biozones. ß

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“…Sea-surface magnetic anomalies within the JQZ, arbitrarily delineated as older than anomaly M25, typically have very low amplitudes and there is a gradual increase in amplitude, extending from at least M29 to around M19, which may be field related (Cande et al, 1978;McElhinny and Larson, 2003) (Figure 8(a)). Although the lineated nature of even older M-sequence anomalies has been documented over fast spreading crust and used for tectonic reconstructions (Handschumacher et al, 1988;Nakanishi et al, 1989;Nakanishi and Winterer, 1998), magnetostratigraphic evidence for polarity reversals over the time interval represented by the JQZ, that is, prior to $M25, is still ambiguous (e.g., Channell et al, 1984;Juarez et al, 1994;Steiner et al, 1985). These older anomalies resemble the kind of shortwavelength, low-amplitude anomalies observed in the Cenozoic that have been attributed to paleointensity variations (Cande and Kent, 1992b).…”

Section: Source Of Oceanic Magnetic Anomalies and The Geomagnetic Polmentioning

confidence: 99%

Source of Oceanic Magnetic Anomalies and the Geomagnetic Polarity Timescale

Gee¹,

Kent²

2007

Treatise on Geophysics

121

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Marine magnetic anomalies (Vine, 1966; Vine and Matthews, 1963) provide a complete record of geomagnetic polarity reversals, making the agecalibrated geomagnetic polarity sequence the basis for global correlations and geochronology for the past 160 My (Figure 1). The relative widths of the magnetic polarity intervals for the Late Jurassic to Recent were determined from magnetic profiles initially by Heirtzler et al. (1968) for the Central Anomaly (Anomaly 1) to Anomaly 32 (C-sequence) and by Larson and Pitman (1972) for Anomalies M1-M22 (M-sequence). Larson and Pitman recognized that the M-sequence anomalies were bracketed by long intervals with apparently few or no reversals: the KQZ between the M-sequence and the ridge crest C-sequence of Heirtzler et al. (to which Larson Table 1 Geomagnetic polarity chrons from marine magnetic anomalies Age range (Ma) Normal polarity Chrons Age range (Ma) Reverse polarity chrons 0

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Jurassic magnetic stratigraphy from Umbrian (Italian) land sections

Cited by 39 publications

References 16 publications

The Global Boundary Stratotype Section and Point (GSSP) for the base of the Pliensbachian Stage (Lower Jurassic), Wine Haven, Yorkshire, UK

The Global Boundary Stratotype Section and Point (GSSP) for the base of the Pliensbachian Stage (Lower Jurassic), Wine Haven, Yorkshire, UK

The Neuquén composite section: magnetostratigraphy and biostratigraphy of the marine lower Jurassic from the Neuquén basin (Argentina)

Source of Oceanic Magnetic Anomalies and the Geomagnetic Polarity Timescale

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