Magnetostratigraphy and magnetic susceptibility of the Las Carreras loess–paleosol sequence in Valle de Tafı́, Tucumán, NW-Argentina

Schellenberger, Andreas; Heller, Friedrich; Veit, Heinz

doi:10.1016/s1040-6182(02)00170-2

Cited by 38 publications

(31 citation statements)

References 39 publications

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“…OSL ages on fine-silt quartz seem to be significantly age underestimated above 100 ka, as evidenced for samples taken from below the Brunhes/ Matuyama polarity change Sayago, 1999, 2001;Kemp et al, 2003;Schellenberger et al, 2003;Schellenberger and Veit, 2006). The El Lambedero section situated about 10 km to the north of La Mesada in the Tafi del Valle region (Tucumán province) was studied by Kemp et al (2004b), establishing an OSL-based chronology for the loess/palaeosol sequence.…”

Section: Discussionmentioning

confidence: 97%

Chronology of late Pleistocene Pampa loess from the Córdoba area in Argentina

Frechen¹,

Seifert²,

Sanabria³

et al. 2009

J Quaternary Science

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In Argentina, loess/palaeosol sequences were studied from the two sections at Monte Ralo and Corralito, located near to the city of Có rdoba in the east of the Pampean ranges. Infrared optically stimulated luminescence (IRSL) and thermoluminescence (TL) dating techniques were applied to set up a more reliable chronological framework for the Upper Pleistocene loess record. IRSL ages increase with depth and are stratigraphically consistent. The oldest loess exposed correlates at least to the penultimate glaciation. The luminescence dating study gives evidence for humid climate conditions with soil formation during the last interglacial period and the middle pleniglacial correlating to Marine Isotope Stage (MIS) 5 and 3, respectively. Three extended periods of soil formation are recorded in the loess/palaeosol sequences at the Corralito section. These buried soils most likely correlate with the last interglacial and early last glacial period. During the Middle Pleniglacial, two palaeosols are intercalated in the loess successions. In the Có rdoba area, the periods of increased loess accumulation and deposition of loessic sediments correlate with more arid and glacial periods during the Early Pleniglacial, the Middle Pleniglacial and the Late Glacial.

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Section: Discussionmentioning

confidence: 97%

Chronology of late Pleistocene Pampa loess from the Córdoba area in Argentina

Frechen¹,

Seifert²,

Sanabria³

et al. 2009

J Quaternary Science

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“…150-195 ka, clearly conflict with the previously published radiocarbon chronology. Further controversy and uncertainty over the age and resolution of the loess-palaeosol record contained in the Tafí del Valle region has been stimulated by the publication of palaeomagnetic data from a different section that indicates a basal age of at least 1.15 Ma (Schellenberger et al, 2003). This paper reports the results of a detailed pedosedimentary and geochronological study of parts of a new 45-m section at El Lambedero, ca.…”

Section: Introductionmentioning

confidence: 96%

Pedosedimentary development of part of a Late Quaternary loess‐palaeosol sequence in northwest Argentina

Kemp

King

Toms

et al. 2004

J Quaternary Science

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The field properties, magnetic susceptibility, particle size, calcium carbonate content, soil micromorphology and optical luminescence ages of the upper 6.1 m and lowermost 4.7 m of the 45 m loess-palaeosol sequence at El Lambedero in the Tafí del Valle region of Tucumán Province (Sierras Pampeanas, northwest Argentina) have been used to set up a partial stratigraphy and chronology, as well as a basic pedosedimentary model of loess accumulation, palaeosol development, reworking and erosion for the site. The minimum ages derived from the basal part of the section suggest that loess began to accumulate some time before 165 ka. A thick and well-developed pedocomplex in the upper profile is correlated with at least the latter part of marine isotope stage (MIS) 5, whereas the overlying palaeosol may be attributable to pedogenic activity during MIS 3. The absence of material younger than 33 ka close to the surface of this rounded spur landform is probably the result of either non-deposition or erosional stripping in response to climatic change, or episodic uplift in this seismically active region.

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“…In loessic sequences, MS variations usually result from differences between paleosoils (developed under wetter/warmer conditions) and loess (deposited under drier/cooler conditions), but this pattern is variable between sites. In Argentina, for example, low MS indicates paleosoils and higher MS is found in loess (Orgeira et al 1998, Schellenberger et al 2003, while in the Chinese Loess Plateau the pattern is the opposite , Zhang et al 2003.…”

Section: Magnetic Susceptibility (Ms)mentioning

confidence: 99%

Cordão Formation: loess deposits in the southern coastal plain of the state of Rio Grande do Sul, Brazil

Lopes

Dillenburg

Schultz

2016

An. Acad. Bras. Ciênc.

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Loess consists of silt-dominated sediments that cover ~10% of the Earth's surface. In southern South America it occurs in Argentina, Bolivia, Paraguay and Uruguay, and its presence in southern Brazil was never studied in detail. Here is proposed a new lithostratigraphic unit, Cordão Formation, consisting of loess deposits in the southern Brazilian coastal plain. It consists of fine-very fine silt with subordinate sand and clay, found mostly in lowland areas between Pleistocene coastal barriers. These sediments are palecolored (10YR hue) and forms ~1,5-2,0 meter-thick stable vertical walls. The clay minerals include illite, smectite, interstratified illite/smectite and kaolinite, the coarser fraction is mostly quartz and plagioclase. Caliche and iron-manganese nodules are also present. The only fossils found so far are rodent teeth and a tooth of a camelid (Hemiauchenia paradoxa). Luminescence ages indicate that this loess was deposited in the latest Pleistocene, between ~30 and 10 kyrs ago, and its upper portion was modified by erosion and accumulation of clay and organic matter in the Holocene. The estimated accumulation rate was ~630 g/ m 2 /year. The probable source of this loess is the Pampean Aeolian System of Argentina and it would have been deposited by the increased aeolian processes of the last glacial.

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Magnetostratigraphy and magnetic susceptibility of the Las Carreras loess–paleosol sequence in Valle de Tafı́, Tucumán, NW-Argentina

Cited by 38 publications

References 39 publications

Chronology of late Pleistocene Pampa loess from the Córdoba area in Argentina

Chronology of late Pleistocene Pampa loess from the Córdoba area in Argentina

Pedosedimentary development of part of a Late Quaternary loess‐palaeosol sequence in northwest Argentina

Cordão Formation: loess deposits in the southern coastal plain of the state of Rio Grande do Sul, Brazil

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