Weathering and weathering processes

Price, D.G.

doi:10.1144/gsl.qjegh.1995.028.p3.03

Cited by 86 publications

(53 citation statements)

References 36 publications

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“…It is known that mineral weathering is an important source of elements to the soils [43]. However, even after weathering of primary minerals, REE can still, partially or totally, be again incorporated in secondary minerals, remaining immobilized [44].…”

Section: Sources and Fate Of Ree In Soilsmentioning

confidence: 99%

Rare Earth Elements in the Soil Environment

et al. 2016

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Rare earth elements (REE) are a homogenous group of 17 chemical elements in the periodic table that are key to many modern industries including chemicals, consumer electronics, clean energy, transportation, health care, aviation, and defense. Moreover, in recent years, they have been used in agriculture. One of the consequences of their worldwide use is the possible increase of their levels in various environmental compartments. This review addresses major topics concerning the study of REE in the soil environment, with special attention to the latest research findings. The main sources of REE to soils, the contents of REE in soils worldwide, and relevant information on the effects of REE to plants were explored. Ecological and human health risk issues related to the presence of REE in soils were also discussed. Although several findings reported positive effects of REE on plant growth, many questions about their biological role remain unanswered. Therefore, studies concerning the actual mechanism of action of these elements on cellular and physiological processes should be further refined. Even more urgent is to unveil their chemical behavior in soils and the ecological and human health risks that might be associated with the widespread use of REE in our modern society.

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Section: Sources and Fate Of Ree In Soilsmentioning

confidence: 99%

Rare Earth Elements in the Soil Environment

et al. 2016

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“…Numerous studies have been performed on many different rock types to reveal the changes in chemical, physical, and mechanical properties after weathering. Weathering is briefly described as the behavior of rocks under various atmospheric effects (Reiche 1950;Ollier 1984;Price 1995). Since most rocks are formed under high pressure and high temperature conditions, they try to adapt their new environment after exposing on the earth surface.…”

Section: Introductionmentioning

confidence: 99%

“…After these surveys, a number of weathering classifications were proposed for various rock types (Moye 1955; Ruxton and Berry 1957;Chandler 1969;Fookes et al 1972;Dearman 1974;Irfan and Dearman 1978;ISRM 1978;ISRM 1981;Singh and Gahrooee 1989;Kılıç 1995;Price 1995;Topal 1995;Tugrul and Gürpınar 1997;ANON 1995;Kılıç 1999;Topal 2002;Arıkan et al 2007). The weathering grades were generally classified qualitatively in the former classification systems, whereas more quantitative descriptions were assigned to different weathering degrees in the latest versions of most classifications.…”

Section: Introductionmentioning

confidence: 99%

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A quantitative weathering classification system for yellow travertines

Akin

2009

Environ Earth Sci

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Weathering can cause adverse effects on the physico-mechanical properties of rocks. Although the processes and outcomes of weathering have been investigated for many rock types, the travertine weathering was not paid enough attention as much as the others. However, the unfavorable effects of weathering may arise rapidly due to travertine's calcium carbonate composition and highly porous texture. Travertine is an important rock type in building stone market and is generally preferred as an exterior façade material. This rock type was also used in many historical buildings and sculptures in the past, and the signs of extensive weathering can be recognized on some of these travertine-made structures. In this study, it was aimed to characterize the effect of weathering on travertine's structural properties. The yellow travertine from Eskipazar (Karabuk, Turkey) was selected as the study material and the samples with different weathering degrees were collected from site. The chemical, physical and mechanical properties of those samples were determined in laboratory. The physico-mechanical variations with progressive weathering grades were statistically evaluated and a weathering classification based on a rating system was proposed for yellow travertine in rock material scale. The newly developed system may assist in characterizing the degree of weathering for historical structures built by yellow travertine. Additionally, the classification may also guide to further researches on the weathering of different types of travertine.

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“…Doğal yapı taşları, dayanıklılığın ve sürekliliğin sembolü olarak bilinmekle beraber farklı kullanım alanlarına ve yerlerine bağlı olarak çevresel faktörlerin etkisiyle fiziksel, kimyasal ve biyolojik bozunmaya uğrarlar [7][8][9][10][11][12][13][14][15][16][17]. Yapıtaşı olarak kullanılmış kayaçlardaki ayrışma, fiziksel etkiler nedeniyle gelişebileceği gibi taşı oluşturan mineraller arasındaki bağlayıcı maddelerin kimyasal etkenlerle bozunarak ortadan kalkması sonucu da oluşabildiği gözlenmiştir.…”

Section: Mardin Eski Yapılarındaki Bozunma Türleriunclassified