International Year of Planet Earth 4. Utilizing Paleosols in Quaternary Climate Change Studies
Bibliographic record
Abstract
Paleosols are an important tool in interpreting Quaternary stratigraphic sequences. Buried, exhumed, and relict soils delineate ancient surfaces that may have undergone weathering processes for long periods. Soils, including many buried soils, sometimes manifest complex histories characterized by polygenetic or superimposed profiles. Identification of the type of paleosol, or at least a diagnostic horizon, can provide valuable insight into past climates, which in turn assists in determining past vegetation. Interpreting a paleosol may be hindered by eroded or partially preserved horizons, complex climatic and environmental histories, and in the case of buried paleosols, alteration of one or more soil horizons by infiltration of material from overlying units. Soil thickness allows the minimum time of the weathering interval to be estimated and various methods are available for estimating the age of a paleosol. Probably the most accurate dating technique involves bracketing the age of the pale-osol using datable material in sedimentary units above and below. Buried soils are found throughout the world, and are common in eolian deposits, such as loess and sand dunes, and allu-vial deposits. In Canada, and other glaciated regions, they are interbedded with glacial deposits and have been most useful in determining periods of sedimentary nondeposition, and interpreting interglacial climates. The loess– paleosol sequences of the Chinese Loess Plateau, where over 37 major climatic cycles have been identified in the past 2.6 Ma, are presented as an outstanding example of the usefulness of buried soils. The Chinese paleosols are similar to Canadian chernozems and Luvisols, indicating steppe–forest to dense forest or steppe–forest vegetation. The cycles are best explained by Milankovitch forcing. SOMMAIRE Les paleosols constituent un outil important dans l’interpretation des sequences stratigraphiques quaternaires. Les sols enfouis, exhumes et reliques constituent des surfaces anciennes qui peuvent avoir ete soumises a l’alteration pendant de longues peri-odes. Les sols, notamment les sols enfouis, revelent parfois des histoires complexes caracterisees par des profils polygeniques ou superposes. L’identification du type de paleosol, ou d’un horizon diagnostique du moins, peut nous dire beaucoup sur les climats anciens, ce qui nous aide ensuite a connaitre la vegetation ancienne. L’inter-pretation des paleosols peut etre compliquee du fait d’horizons erodes ou partiellement preserves, de la complex-ite des histoires climatiques et environ-nementales, et dans le cas de sols enfouis, par l’alteration d’un ou de plusieurs horizons par infiltration provenant des couches sus-jacentes. L’epaisseur des sols permet d’estimer la duree d’alteration minimum alors que des methodes variees permettent d’en estimer l’âge. La technique de datation la plus juste probablement, consiste a delimiter une fourchette d’âge d’un paleosol a partir de materiel approprie des unites sedimentaires sus-jacents et sous-jacents. Il existe des sols enfouis partout dans le monde, et ils sont frequents dans les depots eoliens, tel ceux des lœss et des dunes de sables, et les depots alluviaux. Au Canada et dans d’autres regions jadis glaciaires, les paleosols sont intercales dans des depots glaciaires ont ete tres utiles pour determiner les periodes d’absence de depots, et pour interpreter les climats interglaciaires. Les sequences lœss-paleosol du Plateau de lœss de Chine, ou 37 cycles climatiques majeurs ont ete circonscrits au cours des derniers 2,6 Ma, sont decrits a titre d’exemple remarquable de l’utilite des sols enfouis. Les paleosols de Chine sont semblables aux tchernozioms et luvisols canadiens, et representent une vegetation allant de la foret de steppe a la foret dense. Les cycles s’expliquent le mieux par l’hypothese du forcage de Milankovitch.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".