Relict mountain slope deposits of northern Portugal: facies, sedimentogenesis and environmental implications

Texier, Jean‐Pierre; Meireles, José

doi:10.1002/jqs.752

Cited by 17 publications

(26 citation statements)

References 58 publications

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“…They include areas in France (Bertran 2005), Mediterranean Europe (García-Ruiz et al 2001;Texier & Meireles 2003), North America (Eaton et al 2003;Smoot 2004) and Antarctica (Mori et al 2007). …”

Section: Relict Stratified Slope Depositsmentioning

confidence: 99%

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Stratified slope deposits: periglacial and other processes involved

Steijn

2011

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Stratified slope deposits occur on or at the base of slopes within a wide range of hilly or mountainous environments. Gelifraction, a lack of vegetation, and snowmelt-derived slopewash are thought to be important factors in their development. The relatively fine-grained grèzes litées found at many sites within the French Charente region are the prototype of this kind of deposit. The original, strictly limited and genetically intended definition has been enlarged by mainly non-French authors causing considerable confusion.Other assemblages of cold-climate slope deposits are more heterogeneous, sometimes less clearly stratified, and show much larger variation in grain sizes and sedimentary structures than grèzes litées. The most important of these are stone-banked solifluction (sheets or lobes), rock fall, (dry) grain flow, frost-coated clast flow, debris flow, snow avalanching and, to a lesser degree, rain-generated overland flow and (niveo-) aeolian activity. Many of these processes are azonal and occur under a wide range of environmental conditions. A periglacial context may nevertheless influence process activity in these cases, for instance with regard to their magnitude and/ or frequency.

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Section: Relict Stratified Slope Depositsmentioning

confidence: 99%

“…An example is provided by Texier & Meireles (2003) who discussed relict mountain slope deposits of northern Portugal. Three main processes are reported as responsible for the emplacement of regional relict slope deposits: runoff, debris flows and dry grain flows.…”

Section: Deposits From Azonal Processesmentioning

confidence: 99%

Stratified slope deposits: periglacial and other processes involved

Steijn

2011

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“…For instance, the proposed late Pleistocene archaeological artifacts from northeastern Brazil are, for some authors, geofacts introduced by gravity (Aimola, Andrade, Mota, & Parenti, 2014;Böeda et al, 2013;Lahaye et al, 2015). Less controversially, the study of natural and anthropogenic deposits accumulated by gravity-driven processes can also offer indirect data about paleoenvironmental conditions (e.g., Bertran, 2005;Bertran, Hetu, Texier, & Van Steijns, 1997;Bertran, Laurent, Lenoble, Masson, & Vallin, 2010;Lenoble, Bertran, & Lacrampe, 2008;Texier & Meireles, 2003).…”

Section: Introductionmentioning

confidence: 99%

Gravity and the formation of the archaeological record: Main concepts and methodological tools

Ozán

2017

Geoarchaeology

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This contribution aims to discuss how gravity‐driven processes affect the archaeological record with the goal of building a broad conceptual and methodological framework for dealing with these contexts. A wide compilation of cases regarding gravity‐driven processes is analyzed to recognize relevant environmental factors, the way they affect the properties of the record, and long‐term archaeological expectations. Only by understanding the specific mechanisms and processes that occur in each context can an accurate methodological approach be chosen on which to base interpretations. A careful taphonomic study of the spatial distribution, frequency, size, diversity, and orientation of materials comprising the archaeological record is the first step to recognizing formation processes. Actualistic studies provide a framework for discussing the timing and intensity at which processes occur. A detailed geomorphological description is required to interpret sedimentological and micromorphological analysis, which in turn helps understanding of the relative subaerial permanence of the record, its temporal resolution, and preservation potential. Interpreting surface and buried materials requires the understanding of pedogenetic processes. Broad in/off‐site spatial sampling strategies definitely yield a more realistic picture about the variety of processes in slope settings.

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“…Additionally, the deposits formed by a shallow landslide in the French Alps were described by Bertran and Texier (1999). Some investigations have focused on flow deposits derived from periglacial slope cover (Van Vliet-Lanoë, 1985;Bertran, 1993;Texier and Meireles, 2003), glacial deposits (Harris, 1998;Menzies and Zaniewski, 2003) and debris flow deposits (previously referred to as flow tills - Boulton, 1968) formed in the ice-proximal environment (Lachniet et al, 1999(Lachniet et al, , 2001Phillips, 2006;Ludwikowska-Kędzia and Pawelec, 2014). The first micromorphologic investigations of overland flow deposits concerned loess translocated by water (Mücher et al, 1972(Mücher et al, , 1981(Mücher et al, , 2010Mücher and De Ploey, 1977).…”

Section: Introductionmentioning

confidence: 99%

Macro‐ and Micromorphologic Interpretation of Relict Periglacial Slope Deposits from the Holy Cross Mountains, Poland

Pawelec

Ludwikowska-Kędzia

2015

Permafrost & Periglacial

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Relict periglacial slope cover deposits in the Holy Cross Mountains of Poland are composed of material derived from bedrock, loess and sand of polygenic origin. The aim of this study was to interpret the processes that deposited three massive coarse‐grained diamictons near the base of gentle hillslopes. Based on macroscopic and microscopic sedimentological analyses, the diamictons are attributed to deposition by three processes – active‐layer detachment, solifluction and high‐energy overland flow – due to climatic and geomorphologic factors. The use of microscopic analysis revealed the detailed texture and structure of these deposits, and was particularly important in interpreting fine‐grained sediments produced by low‐energy overland flow. This technique served as the basis for the differentiation of solifluction deposits and high‐density flow deposits. The active‐layer detachment deposit (adjacent to the slip plane) was characterised by a heterogenous texture and breccia‐type structure with domains and clasts oriented parallel to the slope. The deposit included erosional surfaces and individual slip planes. The solifluction deposit was a clayey diamicton with a banded structure oriented parallel to the slope. The low‐energy overland flow deposit was laminated and sorted with laminae oriented parallel to the slope. The high‐energy overland flow deposit was a homogeneous and massive diamicton with a silty/sandy matrix and randomly oriented clasts and grains. The following characteristics helped identify the sediment type: the degree of homogenisation, texture, sedimentary structure and fabric. Features including plasmic fabric, deformation structures and microporosity played an additional role in identifying the studied deposits. In relict slope deposits, these features may be formed as a result of depositional or postdepositional processes. Copyright © 2015 John Wiley & Sons, Ltd.

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Relict mountain slope deposits of northern Portugal: facies, sedimentogenesis and environmental implications

Cited by 17 publications

References 58 publications

Stratified slope deposits: periglacial and other processes involved

Stratified slope deposits: periglacial and other processes involved

Gravity and the formation of the archaeological record: Main concepts and methodological tools

Macro‐ and Micromorphologic Interpretation of Relict Periglacial Slope Deposits from the Holy Cross Mountains, Poland

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