Solution–precipitation of K-feldspar in deformed ...

In the matrix, the precipitation of K-feldspar occurred during deformation, producing very fine-grained, elongated K-feldspar with long-axes oriented parallel to the main foliation. The development of many very fine grains (< ...

Influence of the Quartz Deformation Structures for the ...

deformation conditions, named protomylonite and mylonite were collected. The sample selection ... The separation between quartz and feldspar (K-feldspar and plagioclase) was done using the density difference in a volumetric flask. The ground rock was immersed, without the micas,

K-feldspar deformation

This page compares the deformation of K-feldspar megacrysts in granite in different conditions, from syn-magmatic deformation in the Guojialing pluton, in the Shandong Province in China, to ductile deformation in the Copacabana Range in Catamarca Province in Argentina, to brittle deformation in the Quebrada de Belen shear zone also in …

40Ar Ar age constraints on deformation and …

40Ar Ar age constraints on deformation and metamorphism in the main central thrust zone and Tib...

K Feldspar: K Feldspar mineral information and …

149 photos of K Feldspar associated with Quartz on mindat.org. Smoky Quartz: 69 photos of K Feldspar associated with Smoky Quartz on mindat.org. ... Willaime, C., Christie, J.M., and Kovacs, M.-P. (1979) Experimental deformation of K-feldspar single crystals. Bulletin de Mineralogie: 102: 177.

K-feldspar phenocrysts deformation, Itaporanga …

Photomicrographs here show deformation of K-feldspar porphyroblasts in plutonic rocks of Itaporanga Pluton, Borborema Province. This is part of Roberto's Geosite.

Noncoaxial K-feldspar and AMS subfabrics in …

Abstract A comparative study of the anisotropy of magnetic susceptibility (AMS) and K-feldspar phenocryst fabrics in the Land's End granite demonstrates that the AMS fabric predominantly reflects late magmatic deformation.

MULTIPLE EPISODES OF MAGMATISM, DEFORMATION, …

• Weakly developed foliation defined by K-feldspar porphyroclasts indicates post-crystallization deformation ... Rocks at Black Rock Beach record multiple deformation and metamorphic events that reflect ... Avalonian rocks was the subsequent break up of Pangea during Triassic-Jurassic time. Breakup

Dr Marnie (Margaret) Forster | Research School …

The mylonite (b) has undergone considerably greater deformation, but again the sampled groundmass K-feldspar (P3) does not show significant distortion, and grains are wrapped by ribbon quartz and fine-grained mica that define the mylonite foliation, while the sampled K-feldspar porphyroclasts (P4) are intensely cataclased.

40Ar/39Ar ages in deformed potassium feldspar: …

Detailed field and microstructural studies have been combined with high spatial resolution ultraviolet laser 40 Ar/ 39 Ar dating of naturally deformed K-feldspar to investigate the direct relationship between deformation-related microstructure and Ar isotope systematics. The sample studied is a ...

Deformation-enhanced mineralogical changes in …

Deformation-enhanced mineralogical changes 1 Introduction Strain is generally concentrated into relatively narrow faults and shear zones during deformation of the upper ... crystallization of quartz+albite±K-feldspar±muscovite±b iotite in a vein network and fractures. The later event had

K-feldspar megacrysts in Uwet Granodiorite: “late …

the K-feldspar megacrysts in Uwet granodiorite. These evidences also show that the phenocrysts were formed at liquidus temperature in the presence of abundant liquid.

Semibrittle deformation and partial melting of …

The deformation is concentrated in the lower part of the sample, where the temperature was highest during deformation. A pink K‐feldspar sample (250) deformed at 900°C, 1.5 GPa up to 25% strain ...

Igneous origin of K-feldspar megacrysts in …

Many points of evidence, especially igneous microstructures and structures resulting from solid-state deformation, indicate that K-feldspar megacrysts in deformed granites of the Papoose Flat pluton...

Deformation-Enhanced Element Mobility in Feldspar: A ...

Deformation-Enhanced Element Mobility in Feldspar: A Strain Speedometer? Naomi Barshi*, ... deformation history make it an ideal location to investigate element mobility in feldspar. (Overview ... K-feldspar-bearing granitoids Alisitos Fm.; volcanic and volcaniclastic rocks

K Feldspar Deformation

K-feldspar deformation - Monash University. This page compares the deformation of K-feldspar megacrysts in granite in different conditions, from syn-magmatic deformation in the Guojialing pluton, in the ...

Deformation-induced Pb isotope exchange …

Deformation-induced Pb isotope exchange between K-feldspar and whole rock in Neoarchean granitoids: Implications for assessing Proterozoic imprints

45. Myrmekite formed by Na

K-feldspar is quite small and the myrmekite is very large). The exsolution model is also suitable for double myrmekite lobes with ... China must have undergone strong deformation, recrystallization, and alteration to reduce the An content of the primary plagioclase before myrmekitization; (b) the

Ductile deformation of K-feldspar in dry …

Read "Ductile deformation of K-feldspar in dry eclogite facies shear zones in the Bergen Arcs, Norway, Tectonophysics" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Myrmekite

Request PDF on ResearchGate | Evidence for deformation-induced K-feldspar replacement by myrmekite | ABSTRACT Several examples of deformation-induced myrmekite have been found in two amphibolite ...

k feldspar deformation

k feldspar deformation hospitalityworld.in k feldspar deformation Welcome to Shanghai CNcrusher Mining and Construction Shanghai CNcrusher Mining and Construction Machinery Co., Ltd. is a hi. Semibrittle deformation and partial . To investigate the relationships between deformation, cracking, and partial melting in …

K Feldspar: K Feldspar mineral information and …

149 photos of K Feldspar associated with Quartz on mindat.org. Smoky Quartz: 69 photos of K Feldspar associated with Smoky Quartz on mindat.org. ... Willaime, C., Christie, J.M., and Kovacs, M.-P. (1979) Experimental deformation of K-feldspar single crystals. Bulletin de Mineralogie: 102: 177.

The role of deformation partitioning in the …

The role of deformation partitioning in the deformation and recrystallization of plagioclase and K-feldspar in the Woodroffe Thrust mylonite zone, central Australia

Ar laser analysis of K-feldspar: Constraints on the uplift ...

The 40Ar Ar laser analysis of K-feldspar: Constraints on the uplift history of the Grenville Province in Ontario and New York ... second period of metamorphism and deformation at circa 1050 Ma [Mezger et al., 1993; Busch et al., 1997; Streepey et al., 2001]. This later period of activity is not recorded in

obliquity of K-feldspar from schists, gneisses, and ...

MINERALOGICAL MAGAZINE, MARCH 1984, VOL. 48, PP. 63 The and obliquity of K-feldspar from schists, gneisses, granites in the north-eastern part of the Hida

K-feldspar augen in felsic gneisses and …

Abstract A review of mesostructural and microstructural evidence favours the hypothesis that K-feldspar augen and megacrysts in felsic gneisses and mylonites are generally, if not always, residual phenocrysts, rather than porphyroblasts that grew either during or after the deformation. In most examples, the augen appear to represent variably …

Dating deformation using crushed alkali feldspar: Ar/Ar ...

K-feldspar is a common rock-forming mineral, and it is typically crushed and cataclased (§recrystallised) in ductile shear zones associated with the formation of

10. K

K- AND Si-METASOMATISM IN THE DONEGAL GRANITES OF NORTHWEST IRELAND Lorence G. Collins email: [email protected] ... and K-feldspar and quartz are added in late stages. Early-formed, heavy, mafic minerals are assumed to settle in a deep magma chamber so that successive younger intrusions ... lack of deformation of the K-feldspar …

Rock Deformation and Structural Geology

Myrmekites in mylonite: a new kind of ductile deformation mechanism of K-feldspar Dr. Congyuan Yin Geometry and kinematics of Moyar-Bhavani shear zone (central part), Tamil Nadu India: Characterising a Neoproterozoic oblique transpression

Igneous origin of K-feldspar megacrysts in deformed ...

Igneous origin of K-feldspar megacrysts in deformed granite of the Papoose Flat Pluton, California, USA R. H. Vernon1, 2, ... solid-state deformation, indicate that K-feldspar megacrysts in deformed granites of the Papoose Flat pluton are residual phenocrysts, not porphyroblasts. ...

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