Analisis Tekstur Bt Metamorf

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12 MEI 2016


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TEXTURE & STRUCTURE OFMETAMORPHIC ROCK

Most metamorphic rock originate from large scale

tectonic process

Associated changes in pressure & temperature

Orientation and geometric arrangement of newinequant metamoprhic mineral is controlled !

tectonic process

Metamorphic rocks displa! not onl! a characteristic

metamorphic mineral content" the! are alsocharacteri#ed ! distincti$e metamorphic structure%


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tructure ' (he arrangement of parts of a rock

mass irrespecti$e of scale" including

geometric interrelationships etween the

parts" their shapes and internal features (he terms micro)" meso) and mega) can e

used as a prefi* to descrie the scale of the

feature% Micro) is used for a thin)section scale"meso) for hand)specimen and outcrop scale"

mega) for larger scales%


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+oliation% An! repetiti$el! occurring orpenetrati$e planar structural feature in a rockod!

chistosit!% A t!pe of foliation produced !deformation and,or recr!stalli#ation resulting ina preferred orientation of inequant mineral

grains% It is common practice in ph!llosilicate)rich rocks to use the term slat! clea$ageinstead of schistosit! when indi$idual grains aretoo small to e seen ! the unaided e!e


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-lea$age% A t!pe of foliation consisting of a

regular set of parallel or su) parallel

closel! spaced surfaces produced !

deformation along which a rock od! willusuall! preferentiall! split% More than one

clea$age ma! e present in a rock%

lat! clea$age% .erfectl! de$eloped

foliation independent of edding resulting

from the parallel arrangement of $er! fine)

grained ph!llosilicates


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STRUCTURE OF METAMORPHICROCK


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Banded and folded lower greenschs! faces gran!e gness


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Banded and folded lower greenschs! faces gran!e " gnessdefor#a!on and low grade #e!a#or$hs# $rod%ced a andedor!hogness fro# a 'arscan gran!e( #e!a#or$hc segrega!onassoca!ed w!h defor#a!on res%l!ed n al!erna!ng wh!e ands ofFs$ ) *!+ and green Chl ands( no!e Chl shee!s oren!ed $arallel !o

a,al $lans of folds -Arolla .ness( Ma!!erhorn( Al$s/


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.ness and gnessos!0( hgh1grade S$l"Sl"B!"

.r! gness -234elf5orden( 6orwa0/


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S!"Chl #caschs! and schs!os!0-Sal!dalen( 6orwa0/


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U$$er a#$hol!e faces anded and folded#arle( no!e e,!re#e o%dnage of ands ofslca!e roc4 -Engareen( S7ar!sen( 6orwa0/

A#$hol!e faces anded or!hogness w!h


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A#$hol!e faces anded or!hogness w!hgran!e 7ens( dar4 and n !he %$$er $ar! of$c!%re s a a#$hol!+ed #a8c d04e -ThorRange( An!arc!ca/


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Analisis Tekstur Bt Metamorf

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