Carbonate cementing minerals in rhizoliths from Badain Jaran Desert: Implication for pedo-diagenesis and environment of dune soil

Sun, Qingfeng; Zamanian, Kazem; Huguet, Arnaud; Wiesenberg, Guido L. B.; Zhao, Tian-Lei; Lei, Ziqiang

doi:10.1016/j.rhisph.2022.100647

Cited by 2 publications

(1 citation statement)

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“…Crusts show clear evidence of cylindrical–vertical root traces (molds and casts), burrowing activity by soil fauna, and evidence for hydromorphism such as precipitates of Fe/Mn amorphous oxides, Fe‐rhizoliths and other micro‐features associated with dissolution–reprecipitation processes (see ‘Hydromorphic features’ above). Those characteristics, along with the particular micromorphology of carbonate precipitations which depict a micritic/microsparitic‐like aspect, forming laminations, stains, coatings and hypocoatings, support the interpretation of palustrine carbonates, probably bio‐induced, associated with the development of shallow lakes and/or wetlands in deflation basins (Platt and Wright, 1992; Freytet, Verrechia, 2002; Alonso‐Zarza, 2003; Alonso‐Zarza and Wright, 2010; Perri et al ., 2012; Sun et al .,2019b, 2021, 2023).…”

Section: Discussionmentioning

confidence: 99%

Where did the water come from? Wetlands and shallow lakes in semi‐arid dunefields from South America during the Pleistocene–Holocene transition

Tripaldi,

Ozán,

Heider

et al. 2024

J Quaternary Science

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Stabilized and active dunes and sand sheet deposits abound in a small lake‐dotted semi‐arid region of the Western Pampean Dunefield, Argentina. Here, a multi‐scale and multi‐proxy study of three sites, across a hydrologic gradient from lakes to a dryland with groundwater levels at more than 25 m depth, analyzes calcareous and ferruginous rhizoliths, calcareous crusts, hypocoatings, pedogenic carbonate and amorphous Mn‐oxide precipitates within blowout dunes. These palustrine‐related features indicate significantly wetter conditions that allowed the development of shallow lakes and expanding wetlands during the Pleistocene–Holocene transition, limited by associated optically stimulated luminescence ages between ca. 14.7 and 11.6 ka. These wetter conditions, also identified in other nearby proxy records, may be associated with a strengthened South American Monsoon System, potentially during the Younger Dryas Chronozone, though other geological, ecological and climatic forcings cannot be ruled out with available data. Such a scenario lacks a modern analogue, since current hydrologic excess, evidenced in the formation of lakes and new rivers, is not observed in the localities which record paleolakes. This study underlines the variable conditions for pronounced hydrologic excess in semi‐arid eolian environments in western Argentina with complex ecological, anthropogenic and climatic linkages.

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