New paleomagnetic and paleointensity data from Pliocene lava flows from the Lesser Caucasus

Calvo‐Rathert, Manuel; Bógalo, María Felicidad; Gogichaishvili, A.; Sologashvili, Jemal; Vashakidze, G. T.

doi:10.1016/j.jseaes.2013.04.039

Cited by 13 publications

(18 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Camps et al (1996), Gogichaishvili et al (2000Gogichaishvili et al ( , 2009, Calvo-Rathert et al (2011, 2013 and the present study. Paleointensity results from Gogichaishvili et al (2000) without specific age data have been omitted.…”

Section: Sample Sr12-7supporting

confidence: 67%

“…The subaerial volcanism of the Djavakheti Highland and some other areas of Georgia is most likely related to processes of W-E extension causing emergence Lebedev and Dudauri, 2008;Calvo-Rathert et al, 2013) of the system of sub-meridian faults that served as conduits for the rising magma melts (Adamia et al, 2008). Its basement is composed of Cretaceous and Paleogene volcanogenic sedimentary rocks that are overlain by the Neogene-Quaternary sequence of volcanic rocks emitted during three main stages ( Fig.…”

Section: Geological Setting and Age Of The Sequencementioning

confidence: 99%

“…Fig. 10 shows paleointensity data obtained in previous studies (Camps et al, 1996;Gogichaishvili et al, 2000;Goguitchaichvili et al, 2009;Calvo-Rathert et al, 2011, 2013, with all these determinations having been performed on Pleistocene and Pliocene volcanic flows using Thellier-type methods. On this figure three kinds of behavior can be recognized: Many paleointensity determinations display field values in the 35-55 lT range.…”

Section: Sample Sr12-7mentioning

confidence: 99%

“…No systematic intensity drops are related, however, to the pre and post transitional regimes. Although some new Pleistocene and Pliocene absolute paleointensity data from Georgia are already available from previous studies (Camps et al, 1996;Gogichaishvili et al, 2000Gogichaishvili et al, , 2001Gogichaishvili et al, , 2009Calvo-Rathert et al, 2011, 2013, new paleointensity results from this region are still much needed. In 2012 we sampled a radiometrically dated Pleistocene lava flow sequence consisting of 39 consecutive, independent lava flows in the Djavakheti region (Southern Georgia).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Absolute paleointensity determinations by using of conventional double-heating and multispecimen approaches on a Pliocene lava flow sequence from the Lesser Caucasus

Goguitchaichvili

Caccavari

Calvo‐Rathert

et al. 2016

Physics of the Earth and Planetary Interiors

Self Cite

View full text Add to dashboard Cite

Section: Sample Sr12-7supporting

confidence: 67%

Section: Geological Setting and Age Of The Sequencementioning

confidence: 99%

Section: Sample Sr12-7mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Absolute paleointensity determinations by using of conventional double-heating and multispecimen approaches on a Pliocene lava flow sequence from the Lesser Caucasus

Goguitchaichvili

Caccavari

Calvo‐Rathert

et al. 2016

Physics of the Earth and Planetary Interiors

Self Cite

View full text Add to dashboard Cite

“…Since the 1990s, several new paleomagnetic and paleointensity studies have been carried out in the Djavakheti region, using modern methodology applying strict reliability and quality criteria. Many of them were carried out on Pliocene and Pleistocene lava flow sequences (Caccavari et al, ; Calvo‐Rathert et al, ; Camps et al, ; Goguitchaichvili & Pares, ; Goguitchaichvili et al, ). In these previous studies, several episodes of unstable field behavior could be observed.…”

Section: Introductionmentioning

confidence: 99%

Evidence of Unusual Geomagnetic Regimes Recorded in Plio‐Pleistocene Volcanic Sequences from the Lesser Caucasus (Southern Georgia)

Sánchez‐Moreno

Calvo‐Rathert

Goguitchaichvili

et al. 2018

Geochem Geophys Geosyst

Self Cite

View full text Add to dashboard Cite

We report a detailed paleomagnetic study on two Plio‐Pleistocene lava flow sequences from the Djavakheti Highland, Lesser Caucasus. The Korkhi sequence is composed of two volcanic successions of distinct age (1.9 and 3.1 Ma), while the Apnia sequence was emplaced between 3.8 and 3.1 Ma according to available radiometric datings. Normal, reverse and intermediate polarities have been determined from both sequences. Mean directions of the normal and reverse polarity groups for each section do not match the expected field direction, but the possibility of tectonic rotations has been dismissed. A composite analysis of paleomagnetic directions, of virtual geomagnetic pole (VGP) scatter and available paleointensity results from a previous study, allow the interpretation of the observed paleomagnetic results. In the Apnia sequence, both a short recording time unable to average paleosecular variation (PSV) and an anomalous Earth magnetic field (EMF) record are responsible for the observed paleomagnetic directions. According to paleomagnetic results and radiometric ages, this sequence most probably records the reverse to normal polarity transition C2Ar to C2An‐3n. The upper Korkhi subsequence yields an anomalous EMF record, reflecting a transitional time interval. Paleomagnetic results and available absolute ages suggest that this subsequence either records transition C2r‐1r to Olduvai or Olduvai to C1r‐2r. The lower Korkhi subsequence registers a normal polarity interval within the Gauss chron, reflecting a stable stage of the EMF.

show abstract

PSV10: A Global Data Set for 0–10 Ma Time‐Averaged Field and Paleosecular Variation Studies

Cromwell

Johnson

Tauxe

et al. 2018

Geochem Geophys Geosyst

249

View full text Add to dashboard Cite

Globally distributed paleomagnetic data from discrete volcanic sites have previously been used for statistical studies of paleosecular variation and the structure of the time‐averaged field. We present a new data compilation, PSV10, selected from high‐quality paleodirections recorded over the past 10 Ma and comprising 2,401 sites from 81 studies. We require the use of modern laboratory and processing methods, a minimum of four samples per site, and within‐site Fisher precision parameter, kw, ≥50. Studies that identify significant tectonic effects or explicitly target transitional field states are excluded, thereby reducing oversampling of transitional time intervals. Additionally, we apply two approaches using geological evidence to minimize effects of short‐term serial correlation. PSV10 is suitable for use in new global geomagnetic and paleomagnetic studies as it has greatly improved spatial coverage of sites, especially at equatorial and high latitudes. VGP dispersion is latitudinally dependent, with substantially higher values in the Southern Hemisphere than at corresponding northern latitudes when no VGP cutoff is imposed. Average inclination anomalies for 10° latitude bins range from about +3 ± 2° to −7.5 ± 2° for the entire data set, with the largest negative values occurring at equatorial and mid‐northern latitudes. New 0–5 Ma TAF models (LN3 and LN3‐SC) based on selections of normal polarity data from PSV10 indicate a g20 term that is 3.0% of g10. Non‐zonal variations in field structure are observed near the magnetic equator and in regions of increased radial flux at high latitudes over the Americas, the Indian Ocean, and Asia.

show abstract

New paleomagnetic and paleointensity data from Pliocene lava flows from the Lesser Caucasus

Cited by 13 publications

References 44 publications

Absolute paleointensity determinations by using of conventional double-heating and multispecimen approaches on a Pliocene lava flow sequence from the Lesser Caucasus

Absolute paleointensity determinations by using of conventional double-heating and multispecimen approaches on a Pliocene lava flow sequence from the Lesser Caucasus

Evidence of Unusual Geomagnetic Regimes Recorded in Plio‐Pleistocene Volcanic Sequences from the Lesser Caucasus (Southern Georgia)

PSV10: A Global Data Set for 0–10 Ma Time‐Averaged Field and Paleosecular Variation Studies

Contact Info

Product

Resources

About