Examples of using Dunham classification in English and their translations into Arabic
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Dunham Classification.
The original classification can be summarized as follows: Following the publication of the original Dunham Classification System a number of modifications were proposed.
Dunham Classification.
Following the wide adoption of the Embry and Klovan(1971[2]) modifications, the Dunham Classification system is typically referred to as the'modified Dunham Classification System' with both Dunham(1962[1]) and Embry and Klovan(1971[2]) being cited.
Dunham Classification System.
Recognising that the identification of these structures is problematic at the limited scale of a petrographic thin section and typically requires examination of outcrop exposures or core, Embry and Klovan stated that where the mode of bindingis not identifiable then the original Dunham classification term boundstone should be retained.
Grainstone in the Dunham Classification(Brassfield Formation near Fairborn, Ohio). Grains are crinoid fragments.
In the Dunham classification(Dunham, 1962[3]) system of limestones, a mudstone is defined as a mud-supported carbonate rock that contains less than 10% grains. Most recently, this definition has been clarified as a matrix-supported carbonate-dominated rock composed of more than 90% carbonate mud(<63 μm) component.[4].
Robert J. Dunham published his classification system for limestone in 1962.[1]The original Dunham classification system was developed in order to provide convenient depositional-texture based class names that focus attention on the textural properties that are most significant for interpreting the depositional environment of the rocks.
The Dunham classification system for carbonate sedimentary rocks was originally devised by Robert J. Dunham in 1962,[1] and subsequently modified by Embry and Klovan in 1971[2] to include coarse-grained limestones and sediments that had been organically bound at the time of deposition. The modified Dunham Classification has subsequently become the most widely employed system for the classification of carbonate sedimentary rocks with 89%[3] of workers currently adopting this system over the alternative Folk[4] classification scheme.
Following the publication of the original Dunham Classification System a number of modifications were proposed. The most widely adopted of these has been that of Embry and Klovan(1971)[2]who recognized that the Dunham classification scheme lacked detail when it came to the description of organically-bound and coarse-grained limestones.
As with the original Dunham classification, modifiers should be employed to enhance the classification. Additionally, the class names should be employed as textural modifiers to describe the matrix. Embry and Klovan also redefined'mud matrix' as material with a diameter of <30 μm.
It adds some diagenetic patterns andcan be summarized as follows: Dunham, R.J.(1962) Classification of carbonate rocks according to depositional texture.
Dunham specifically stated that, where appropriate, these six textural class names are intended to be combined with modifiers describing grains and mineralogy. The original classification can be summarized as follows.