The control of deformation partitioning and strain localization on porphyroblast behaviour in rocks and experiments

Bell, T. H.; Sanislav, Ioan V.; Sapkota, Jyotindra

doi:10.1007/s12303-017-0030-8

Cited by 3 publications

(1 citation statement)

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“…That leads to redistribution of heat within the crust, which, in turn, affects the deformation behavior of the rock [4,5]. Furthermore, localization of deformation [6,7] into fault zones has been used to explain fluid flow at crustal scale levels that can lead to redistribution and/or concentration of elements and eventually, to the formation of ore deposits [8,9]. It is particularly worth noting that there is a tendency for older structures to get reactivated during younger deformation events, which leads to prolonged tectonic activity along the same structures [10,11].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Pre-Existing Deformation and Alteration Textures on Rock Strength, Failure Modes and Shear Strength Parameters

Everall

Sanislav

2018

Geosciences

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This study uses the uniaxial compressive strength (UCS), the indirect tensile strength (ITS) and the point load tests (PLT) to determine the strength and deformation behavior of previously deformed and altered tonalite and anorthosite. In general, veined samples show higher strength because the vein material has both cohesive and adhesive properties while fractures have no cohesion, only frictional resistance. This implies that each rock category has to be treated independently and absolute strength predictions are inaccurate. Thus, the conversion factor k is a sample specific parameter and does not have a universal value. The ratio of UCS/ITS appears to be related to the rock strength and can be used to classify rocks based on their strength. The shear strength parameters, the friction angle and the cohesion, cannot be calculated for rocks with pre-existing planes of weakness. Reactivation is favoured only for planes oriented less than 20 • to the maximum stress. For planes oriented between 20 • and 50 • to the maximum stress, failure occurs by a combination of reactivation and newly formed fractures, while for orientations above 50 • , new shear fractures are favoured. This suggest that the Byerlee's law of reactivation operates exclusively for planes oriented ≤10 • to the maximum stress.

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Section: Introductionmentioning

confidence: 99%

The Influence of Pre-Existing Deformation and Alteration Textures on Rock Strength, Failure Modes and Shear Strength Parameters

Everall

Sanislav

2018

Geosciences

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Improved resolution of Paleoproterozoic orogenesis: Multi-directional collision tectonics in the Sodankylä belt of northern Finland

Sayab

Lahtinen

Köykkä

et al. 2021

Precambrian Research

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Metamorphism (greenschist facia down) of terrigenous rocks in the northern part of the Kularsky gold-bearing district, Yakutia: mineral ratios with cleavage

Sustavov

2024

jour

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In the Kularsky gold-bearing area, where 170 tons of gold were extracted from placers, primary gold deposits have not been well studied; therefore, their development requires detailed geological analysis including the study of rock metamorphism. A large Ulakhan-Sis anticline composed of Permian carbonaceous-terrigenous rocks is found on the northwestern ﬂank of the Kular-Nersky folded belt of the Verkhoyano-Kolyma orogenic region. In this article we describe the material composition of carbonaceous-terrigenous rocks prevalent in the northern part of the Kularsky district. The degree of their postdiagenetic transformations varies from metagenesis in Triassic rocks to muscovite-chlorite and biotite subfacies of the greenschist facia of metamorphism in Permian rocks of the Ulakhan-Sis anticline. As the transition from metagenesis to muscovite-chlorite and biotite subfacies of metamorphism the degree of recrystallization of rocks, the grain sizes of the recrystallization of clastic quartz and the width of newly formed muscovite ﬂakes are increasing, monazite, ilmenite, biotite ﬂakes appear in rocks. These changes occur before the completion of formation in the rocks of the S1 slate cleavage.After the formation of the latter, mainly before the appearance of a later crenulation cleavage S2, crystallization of pyrite occurs in the rocks. Porphyroblasts of biotite and magnesiosiderite appear during the formation of a crenulation cleavage S2. The appearance of biotite during the formation of the S1 and S2 cleavages may correspond to the theories about the two-stage metamorphism of the rocks of the area. Thus, further metamorphism studies in this region are required.

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The control of deformation partitioning and strain localization on porphyroblast behaviour in rocks and experiments

Cited by 3 publications

References 54 publications

The Influence of Pre-Existing Deformation and Alteration Textures on Rock Strength, Failure Modes and Shear Strength Parameters

The Influence of Pre-Existing Deformation and Alteration Textures on Rock Strength, Failure Modes and Shear Strength Parameters

Improved resolution of Paleoproterozoic orogenesis: Multi-directional collision tectonics in the Sodankylä belt of northern Finland

Metamorphism (greenschist facia down) of terrigenous rocks in the northern part of the Kularsky gold-bearing district, Yakutia: mineral ratios with cleavage

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