Fracture characteristics in weathered granites

Ehlen, Judy

doi:10.1016/s0169-555x(99)00071-9

Cited by 39 publications

(19 citation statements)

References 18 publications

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“…The maximum mean of the joint spacing occurs in fresh rock, while the minimum mean of joint spacing is found in moderately weathered rock. This finding is in agreement with the finding reported by Ehlen (1999Ehlen ( , 2002 and Komoo (1998). The observed trend for a decrement in joint spacing from fresh to moderately weathered rock may be caused by the disintegration and physical changes in rock with the progress of weathering.…”

Section: Joint Characterization In Different Weathering Zonessupporting

confidence: 94%

Dominant weathering profiles of granite in southern Peninsular Malaysia

Abad¹,

Mohamad²,

Komoo³

2014

Engineering Geology

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Section: Joint Characterization In Different Weathering Zonessupporting

confidence: 94%

Dominant weathering profiles of granite in southern Peninsular Malaysia

Abad¹,

Mohamad²,

Komoo³

2014

Engineering Geology

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“…The formation of fractures in plutons is also a complex multiphase and cumulative process that may involve initial thermal fracturing during cooling, hydraulic fracturing due to fluid overpressure, fracturing caused by external tectonic stresses, and fracturing related to uplift and post-uplift processes (e.g., Bahat and Rabinovitch 1988;Bahat et al 1999Bahat et al , 2001aBahat et al , b, 2003Bahat et al , 2005Bankwitz et al 2000;Bankwitz and Bankwitz 2004a, b;Bankwitz et al 2004;Bergbauer and Martel 1999;Bergbauer et al 1998;Ehlen 1999;Gerla 1988;Hancock and Engelder 1989;Holzhausen 1989;Pollard and Aydin 1988;Segall and Pollard 1983;Segall et al 1990;Ž ák et al 2006).…”

Section: Introductionmentioning

confidence: 99%

“Granite tectonics” revisited: insights from comparison of K-feldspar shape-fabric, anisotropy of magnetic susceptibility (AMS), and brittle fractures in the Jizera granite, Bohemian Massif

Žák

Verner

Klomínský

et al. 2008

Int J Earth Sci (Geol Rundsch)

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In the Jizera granite of the Krkonoše-Jizera Plutonic Complex, northern Bohemian Massif, contrasting patterns of magmatic K-feldspar fabrics and brittle fractures characterize different structural levels of the pluton. The uppermost exposed level at *800-1,100 m above sea level is dominated by flat foliation that overprints two steep foliations. In contrast, K-feldspar shape-fabric in an underground tunnel (*660 m above sea level) shows complex variations in orientation and intensity. Magnetic fabric carried by coaxial contributions of biotite, magnetite, and maghemite is homogeneous along the examined section of the tunnel, and is decoupled from the K-feldspar fabric. The Jizera granite is crosscut by two regional sets of subvertical fractures (*NE-SW and *NW-SE) and by near-surface exfoliation joints. The multiple fabrics are inferred to reflect a complex magmatic strain history at different structural levels of the pluton, bearing little or no relationship to the fracture network. In contrast to the original concept of Hans Cloos (''granite tectonics''), we conclude that no simple genetic relationship exists between fabrics and fractures in plutons. An alternative classification of fractures in plutons thus should avoid relationships to magmatic fabrics and should instead consist of cooling, syntectonic, uplift, and post-uplift fractures.

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“…The geomechanic survey has revealed the presence of strongly weathered materials and fracture zones in high fault concentration areas, where the joint spacing increases from a moderately weathered zone to a completely weathered zone. The latter, happens because the increase of weathering destroys the structural features of rock masses and, thus, the joint spacing has a tendency to increase (e.g., Ehlen, 1999Ehlen, , 2002Komoo, 1998). In the geological model (Fig.…”

Section: Discussionmentioning

confidence: 99%