Early Pleistocene climate cycles in continental deposits of the Lesser Caucasus of Armenia inferred from palynology, magnetostratigraphy, and 40Ar/39Ar dating

Joannin, Sébastien; Cornée, Jean‐Jacques; Münch, Philippe; Fornari, Michel; Vasiliev, Iuliana; Krijgsman, Wout; Nahapetyan, Samvel; Gabrielyan, Ivan; Ollivier, Vincent; Roiron, Paul; Chataigner, Christine

doi:10.1016/j.epsl.2010.01.007

Cited by 47 publications

(35 citation statements)

References 30 publications

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“…The longest normal polarity interval, occurring at Ashotavan-2, spans w30 m. Taking this length as the total length of the Jaramillo subchron, a lower limit for the sedimentation rate can be calculated. This leads to a rate of w35.7 AE 2.1 cm/ky, which is in accordance with the accumulation rate of Joannin et al (2010), but much more precise. Applying a sedimentation rate in this range (Gabrielyan and Kovar-Eder, 2011). leads to reversal durations of all the present polarity transitions of w4000e6000 y, using a 45 reversal cutoff criterion (Clement, 2004).…”

Section: Sedimentation Rate and Reversal Durationsupporting

confidence: 57%

“…As these outcrops are only w5 km apart, this seems very unlikely. Tectonic evidence from the region (Philip et al, 2001;Joannin et al, 2010) does not support such prominent movements.…”

Section: Numerical Agesmentioning

confidence: 54%

“…6), which clearly exceed the maximum values of greigite. Therefore, the interpretation of Joannin et al (2010), that the carrier of the characteristic remanence is likely to be an iron sulphide, such as greigite, is disproved.…”

Section: Shamb-2mentioning

confidence: 91%

“…This site has already been described and studied intensively by Joannin et al (2010) and Ollivier et al (2010). Based on paleomagnetic analysis of 19 samples (all 19 samples yield reverse polarities) in combination with radio-isotope dating of intercalated tuff layers, an age of w1.08ew1.30 Ma has been determined .…”

Section: Shamb-2mentioning

confidence: 99%

“…Therefore, it is difficult to estimate a sedimentation rate with good precision. In the study of Joannin et al (2010), two numerical age data enclosing a sedimentary sequence were presented, which allowed calculation of an accumulation rate of w37.5 AE 38.5 cm/ky.…”

Section: Sedimentation Rate and Reversal Durationmentioning

confidence: 99%

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High resolution magnetostratigraphy and radio-isotope dating of early Pleistocene lake sediments from southern Armenia

Kirscher

Bruch

Gabrielyan

et al. 2014

Quaternary International

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Section: Sedimentation Rate and Reversal Durationsupporting

confidence: 57%

“…As these outcrops are only w5 km apart, this seems very unlikely. Tectonic evidence from the region (Philip et al, 2001;Joannin et al, 2010) does not support such prominent movements.…”

Section: Numerical Agesmentioning

confidence: 54%

Section: Shamb-2mentioning

confidence: 91%

Section: Shamb-2mentioning

confidence: 99%

Section: Sedimentation Rate and Reversal Durationmentioning

confidence: 99%

See 3 more Smart Citations

High resolution magnetostratigraphy and radio-isotope dating of early Pleistocene lake sediments from southern Armenia

Kirscher

Bruch

Gabrielyan

et al. 2014

Quaternary International

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Transition from a singly vergent to doubly vergent wedge in a young orogen: The Greater Caucasus

2014

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The Greater Caucasus Mountains, due to their youth (~5 Ma), provide an opportunity for insight into the early stages of orogen development during continent-continent collision. However, their recent tectonic evolution and first-order architecture remain unclear. Here we investigate the evolution of the orogen by integrating new observations of the fluvial geomorphology and neotectonics of the range with prior work on seismicity, geodetic strain, bedrock geology, and foreland basin structure. We find that the range contains four zones along strike that differ in structural architecture, topography, and first-order tectonic history. In particular, two south directed, singly vergent zones at the western and eastern tips of the orogen are separated by both a central doubly vergent zone that is dominated by north directed deformation and an eastern doubly vergent zone in which south directed thrusting dominates. We hypothesize that the along-strike changes in vergence and locus of deformation reflects different stages in the development of a doubly vergent orogen, with the tips of the range preserving an early, singly vergent form and the center recording a more advanced orogen. The differences between the two doubly vergent zones seem to be driven by the initial stages of collision between the structurally thickened crust of the Greater and Lesser Caucasus orogens, which initiated at~5 Ma.

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A story from the Miocene: Clock‐dated phylogeny of Sisymbrium L. (Sisymbrieae, Brassicaceae)

Čalasan

German

Hurka

et al. 2021

Ecology and Evolution

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Sisymbrium L. (Brassicaceae, Sisymbrieae DC.) belongs to one of the most well-studied and economically important plant families in the world, including important vegetables and forage crops, condiments, decorative plants, and model organisms. Nevertheless, morphological homogeneity within the genus on the one hand and extreme intraspecific morphological variability and lack of precise generic boundaries on the other hand have hindered systematic studies of Sisymbrium until the last decade (Al-Shehbaz, 2006b; Warwick et al., 2002, 2006). Much effort has been put into elucidating the actual number of Sisymbrium species, starting with the first worldwide monographic study by Fournier as early as 1865. His generic concept, however, was based very broadly and is nowadays considered outdated (Warwick et al., 2006). Several other

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Early Pleistocene climate cycles in continental deposits of the Lesser Caucasus of Armenia inferred from palynology, magnetostratigraphy, and 40Ar/39Ar dating

Cited by 47 publications

References 30 publications

High resolution magnetostratigraphy and radio-isotope dating of early Pleistocene lake sediments from southern Armenia

High resolution magnetostratigraphy and radio-isotope dating of early Pleistocene lake sediments from southern Armenia

Transition from a singly vergent to doubly vergent wedge in a young orogen: The Greater Caucasus

A story from the Miocene: Clock‐dated phylogeny of Sisymbrium L. (Sisymbrieae, Brassicaceae)

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