Systematics of U–Th disequilibrium in calcrete profiles: Lessons from southwest India

Durand, Nicolas; Hamelin, Bruno; Deschamps, Pierre; Gunnell, Yanni; Curmi, Pierre

doi:10.1016/j.chemgeo.2016.06.026

Cited by 6 publications

(2 citation statements)

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“…Few karstic features are likewise observed in the field, whether on calcrete duricrusts or among the scarce Precambrian limestone outcrops. The solution and reprecipitation cycles are not, however, detectable in any of the U-Th age patterns-perhaps partly because, when dating impure carbonates, age precision is relatively low and decreases with increasing carbonate age (Durand et al, 2016).…”

Section: Importance Of Terrestrial Caco 3 Accumulation For Carbon Seq...mentioning

confidence: 96%

“…Alpha petrofabrics, i.e., micromorphological features predominantly resulting from physicochemical precipitates, which are widespread on non-carbonate host rocks in southern India, are more commonly associated with drier conditions than beta petrofabrics, i.e., biogenically formed features (Tanner, 2010). However, the U-Th age distribution of carbonate accumulations on the Indian craton, which ranges from ~300 to ~18 ka (Durand et al, 2016; see Supplementary Material S5), does not correlate in any systematic way with notionally drier (glacial) or wetter (interglacial) epochs. Evidence, therefore, suggests overall that widespread CaCO 3 accumulation and retention across the land surface has been a relatively continuous process in peninsular India since at least Middle Pleistocene time.…”

Section: Clues From the Non-kaolinitic Alluvial Sequencesmentioning

confidence: 99%

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Regional Soil Patterns as Indicators of Late Cenozoic Change in the Critical Zone: A Baseline Synthesis for the Landscapes of Peninsular India

Gunnell,

Durand,

Pappu

2024

Earth Sci. Syst. Soc.

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Regolith across the South Indian shield has not previously been mapped. Here we provide a diagnosis of directional and lasting climate change from humid to semi-arid since the late Cenozoic based on evidence provided by mosaics of 1) residual, 2) colluvial and 3) alluvial soils across 700,000 km2 of southern peninsular India. Results are inferred from a systematic geomorphological and palaeoenvironmental interpretation of 1:250,000 scale legacy soil maps at order to subgroup level, complemented by field surveys and controls of soil parent material—i.e., regolith. The inventory highlights two generations of residual soils: 1) deep Lixisols, hosting low-activity clays and large iron hydroxide concentrations indicative of humid conditions in the geological past; and 2) shallow Luvisols containing high-activity clays and large stocks of exchangeable bases, indicative of drier conditions compatible with the modern climate. Where still present, the relict Lixisol inliers straddle drainage divides and are in the final stages of being thinned or fully stripped by headward stream erosion. They are being replaced by the Luvisols over shallow weathering fronts. Colluvial and alluvial soils, including widespread Vertisols, are used as tools for detecting and mapping different generations of Quaternary flood deposits: fluvial terraces, coastal fan-deltas, and shallow upland palaeolakes. In a region mostly devoid of carbonate rock outcrops, the widely distributed pool of soils hosting abundant accumulations of pedogenic CaCO3 also reveals the magnitude of silicate bedrock weathering as a process for generating secondary calcium carbonate in the rock cycle, thereby highlighting an under-appreciated contribution to inorganic carbon sequestration in the global carbon cycle. The results and maps produced provide exploration tools for future, more systematic and coordinated investigations of the nature and chronology of Quaternary deposits in peninsular India. This includes assessing their potential for hosting different generations of prehistoric archaeological remains.

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Section: Importance Of Terrestrial Caco 3 Accumulation For Carbon Seq...mentioning

confidence: 96%

Section: Clues From the Non-kaolinitic Alluvial Sequencesmentioning

confidence: 99%

Regional Soil Patterns as Indicators of Late Cenozoic Change in the Critical Zone: A Baseline Synthesis for the Landscapes of Peninsular India

Gunnell,

Durand,

Pappu

2024

Earth Sci. Syst. Soc.

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Reconstruction of Indian monsoon precipitation variability between 4.0 and 1.6 ka BP using speleothem δ18O records from the Central Lesser Himalaya, India

et al. 2017

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Late Quaternary aeolian environments, luminescence chronology and climate change for the Monahans dune field, Winkler County, West Texas, USA

Forman

Tew-Todd²,

Mayhack³

et al. 2022

Aeolian Research

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Systematics of U–Th disequilibrium in calcrete profiles: Lessons from southwest India

Cited by 6 publications

References 64 publications

Regional Soil Patterns as Indicators of Late Cenozoic Change in the Critical Zone: A Baseline Synthesis for the Landscapes of Peninsular India

Regional Soil Patterns as Indicators of Late Cenozoic Change in the Critical Zone: A Baseline Synthesis for the Landscapes of Peninsular India

Reconstruction of Indian monsoon precipitation variability between 4.0 and 1.6 ka BP using speleothem δ18O records from the Central Lesser Himalaya, India

Late Quaternary aeolian environments, luminescence chronology and climate change for the Monahans dune field, Winkler County, West Texas, USA

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