Thin-section analysis of lithified paleosols from Dagshai Formation of the Himalayan Foreland : Identification of paleopedogenic features and diagenetic overprinting and implications for paleoenvironmental reconstruction
Diagenèse ; Himāchal Pradesh ; Inde ; Micromorphologie ; Oligocène ; Paléo-environnement ; Paléosol ; Propriétés du sol ; Séquence sédimentaire
Here, the AA. report micromorphology of diagenetically altered paleosols (~ 31 Ma old) from Dagshai Formation, Himalayan Foreland. The fluvial sequence exposed along the Koshaliya River, NW Himalaya, contains 4 types of paleosols with decreasing
abundance of well-developed paleosols from basal to upper part of the Dagshai Formation. Diagenesis caused compaction, cementation, re-crystallization and coalification. Despite diagenetic alteration, evidence of paleopedogenic processes is still well
-preserved in these fossil soils in the form of microstructures, b-fabrics, pedogenic calcite, bioturbation, and textural pedofeatures. Thin-section analysis helped to distinguish pedogenic and diagenetic features of lithified paleosols and to infer
the paleoenvironment of the Dagshai paleosols. Paleopedology indicates tropical weathering during early Oligocene time.
To provide more insight in the formation of S5 and its environmental significance, the pedogenesis and clay mineral transformation in the the fifth paleosol complex (S5) of the Wugong section (Shaanxi Province) on the southernmost Chinese Loess
and translocation occur in the S5. However, chemical alteration of phyllosilicate minerals mainly is weak. Mineral weathering is restrained by calcic horizon, argillic horizon, flat terrain. Therefore, pedogenesis in a loess–paleosol sequence and its pedogenic
Paleosols, bones, phytoliths, and δ13C signatures of humus and teeth in the alluvial sequence of Axamilpa, Puebla : Inferences for landscape evolution and megafauna paleoecology during MIS 3–2 in Southern Mexico
The study area, Axamilpa, is located close to the town of Tepexi de Rodríguez in the state of Puebla. The goal of this work is to reconstruct the past environmental conditions through the study of 3 proxies : paleosols, paleobotanical records
(stable carbon isotopes and phytoliths) and mammalian fossil remains incorporated in an alluvial paleosol-sedimentary sequence. The AA. interpret the Late Pleistocene landscape of this area as a heterogeneous forest–grassland landscape with the forest
Identifying depositional and pedogenetic controls of Late Pleistocene loess-paleosol sequences (Saxony, Germany) by combined grain size and microscopic analyses
The AA. demonstrate how combining high-resolution grain size and microscopic analyses can be used to discriminate depositional and pedogenetic features of Late Pleistocene loess-paleosol sequences (LPS) from the Saxonian Loess Region. Grain size
To obtain a high climatostratigraphic resolution in the Western Mediterranean, the AA. investigated geoarchives with paleosols and sediment layers in cliff profiles of 2 alluvial fans on Mallorca, their pedostratigraphy covered the Late Pliocene
Changement climatique ; Chronostratigraphie ; Colluvions ; Ethiopie ; Géoarchéologie ; Holocène ; Paléo-environnement ; Paléosol ; Phytolithe ; Tigray ; Utilisation du sol ; Zone intertropicale
, paleosols and phytoliths in Yeha illustrate existing links between ancient land-use being part of the Ethio-Sabaean culture and different stratigraphic units. While the study of colluvial deposits provide answers on cultural chronology and land-use-changes
, the study of paleosols buried by or formed within these colluvial deposits makes it possible to demonstrate Holocene climate change along the intertropical convergence zone (ITCZ)
Ecosystème ; Forêt tropicale ; Kilimanjaro ; Matière organique ; Montagne ; Paléosol ; Pente de versant ; Propriétés du sol ; Sol noir ; Séquestration du carbone ; Tanzanie ; Volcan
of the Kilimanjaro. These paleosol sequences are characterized by high soil organic carbon contents. SOC stocks per square meter exceed those of typical Andosols and Chernozems. As compared to the SOC storage in the surrounding savannah soils of the Maasai Steppe
Alpes ; Amérique du Sud ; Andes ; Dryas ; Europe ; Fluvioglaciaire ; Impact cosmique ; Lithologie ; Micromorphologie ; Minéralogie ; Météorisation ; Paléosol ; Quaternaire ; Sédimentologie ; Tardiglaciaire
in weathering rinds and in sands of associated paleosols and glaciofluvial deposits carry undeniable attributes of melted glassy carbon and Fe spherules, planar deformation features, and impacted minerals of diverse lithologies. In concert with other black mat
in the Sayan-Tuva Upland. Paleo-archives covering about 13 000 yrs were studied : paleosol-sedimentary sequences on a delta-alluvial fan of a small river, lacustrine sediments in bottom cores and on palsa-islands and soils of palsa-islands. Continental
loess-paleosol sequence at Nussloch (near Heidelberg, SW Germany) contains rhizoliths (calcified roots) of Holocene age. With the carbonatic encrustation leading to preservation of former root deposits, rhizoliths allow for assessment of rhizosphere