Magnetostratigraphy and magnetic parameters in Quaternary sequences of Balcarce, Argentina. a contribution to understand the magnetic behaviour in cenozoic sediments of South America

Samus, Mauro Leandro Gómez; Rico, Yamile; Bidegain, Juan Carlos

doi:10.1016/j.grj.2017.02.005

Cited by 6 publications

(6 citation statements)

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“…Therefore the Vela Formation was likely deposited during the Middle Pleistocene and given its fossil content would be younger than 450 Ka. The Vela Formation is correlated to level 3 (Teruggi et al 1973) and to LU2 (Gómez Samus et al 2017) in the Sierras de Balcarce. Moreover it should be correlated to lithostratigraphic unit 2 of the Azul Creek Basin (Zárate and Mehl 2010) and to the La Esperanza unit in the Sierras Bayas (Poiré et al 2013(Poiré et al , 2014(Poiré et al , 2016.…”

Section: Paleomagnetism and Magnetostratigraphymentioning

confidence: 99%

Neogene–Quaternary in Tandilia, South America: litho- bio- magnetostratigraphy

et al. 2017

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This paper aims to contribute to the stratigraphic and geochronological knowledge of the Neogene-Quaternary of the geologic province of Tandilia by doing lithostratigraphic, paleomagnetic and paleontological analyses. Four lithostratigraphic units have been recognized. The oldest (Late Miocene) constitutes a unit composed of colluvium deposits; it lays in erosional unconformity over the Neoproterozoic rocks. This unconformity is related to important events in the Andes during the Middle-Late Miocene. Over the oldest colluvial sediments, and placed in erosional unconformity, there are sediments assigned to the Barker Formation which are essentially fluvial deposits with a development of several paleosols. Owing to the fossil remains, this unit is assigned to the Montehermosan-Chapadmalalan Stage/Age, whereas the paleomagnetic record would correspond to C3A, Gilbert and Gauss chrons. So, the age is narrowed to the timespan 7.1-3.1 Ma (Late Miocene-Early Pliocene). The Vela Formation lays in erosional unconformity over the Barker Formation. It also has fluvial origin, while the youngest unit (Las Á nimas Formation) corresponds to loess. Both units provide normal polarity and were assigned to Brunhes chron (\0.78 Ma). The Vela Formation presents fossil remains from Bonaerian-Lujanian Stage/Age and belongs to the Middle Pleistocene. The hiatus between the Barker and Vela Formations seems to be considerable: it represents at least 2.6 million years. The reason for the lack of sedimentary records is still a matter of discussion. The deposition of Las Animas Formation seems to span the last 40,000 years. However, this could be linked to a major entrance of windcarried sediments during dry periods, including the Last Glacial Maximum. The hiatus between the Vela and Las Á nimas Formations may have been over 100,000 years.

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Section: Paleomagnetism and Magnetostratigraphymentioning

confidence: 99%

Neogene–Quaternary in Tandilia, South America: litho- bio- magnetostratigraphy

et al. 2017

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“…Of the chronological approaches, magnetostratigraphic studies provide the key absolute time control for the loess-palaeosol deposits. The Matuyama-Brunhes boundary (MBB), the last geomagnetic field reversal, related to marine isotope stage (MIS) 19 and dated at ~780 ka [141,142] (or 773 ka according to recent data [143]), is one of the most frequently used time markers in the Quaternary stratigraphy [144][145][146][147][148][149][150][151][152]. The determination of the MBB allows for correlating even remote loess-palaesol sequences regardless of their lithostratigraphic subdivision.…”

Section: Introductionmentioning

confidence: 99%

Early–Middle Pleistocene Magnetostratigraphic and Rock Magnetic Records of the Dolynske Section (Lower Danube, Ukraine) and Their Application to the Correlation of Loess–Palaeosol Sequences in Eastern and South-Eastern Europe

Hlavatskyi

Бахмутов

2021

Quaternary

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We present new palaeomagnetic and rock magnetic results with a stratigraphic interpretation of the late Early–Middle Pleistocene deposits exposed on the left bank of the River Danube at Dolynske, southern Ukraine. A thick succession of water-lain facies is succeeded by reddish-brown clayey soils, topped by a high-resolution loess–palaeosol sequence. These constitute one of the most complete recently discovered palaeoclimate archives in the Lower Danube Basin. The suggested stratigraphy is based on the position of the Matuyama–Brunhes boundary, rock magnetic, palaeopedological and sedimentological proxies, and it is confidently correlated with other loess records in the region (Roksolany and Kurortne), as well as with the marine isotope stratigraphy. The magnetic susceptibility records and palaeosol characteristics at Dolynske show an outstanding pattern that is transitional between eastern and south-eastern European loess records. Our data confirm that the well-developed S4 soil unit in Ukraine, and S5 units in Romania, Bulgaria and Serbia, correlate with the warm MIS 11. Furthermore, we suggest the correlation of rubified S6 palaeosols in Romania and Bulgaria and the V-S7–V-S8 double palaeosol in Serbia with S6 in Ukraine, a strong Mediterranean-type palaeosol which corresponds to MIS 15. Our new results do not support the hypothesis of a large magnetic lock-in depth like that previously interpreted for the Danube loess, and they prove that the Matuyama–Brunhes boundary is located within the palaeosol unit corresponding to MIS 19. The proposed stratigraphic correlation scheme may serve as a potential basis for further regional and global Pleistocene climatic reconstructions.

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“…Frequency dependent susceptibility (χ df ) signal may be increased by the relative abundance of superparamagnetic particles (SP) like ultrafine magnetite/maghemite. This pedogenic minerals are very common in soils and paleosols of pampean loessic sediments (Gómez Samus et al, 2017). The objective of this work was to assess the NGS and χ logging signals, and relate them with mineralogy and As-bearing phases in the sediments of the aquifer.…”

Section: Introductionmentioning

confidence: 99%