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Kristallingeologie Results test A, 2008

28 participants 7

lecture 7

6

5

Maximum 70 points 4

Pass 35 points ( 50%) 32

Foliations &1

0

11 . 3 1 . 7 22 . 32 . 7 33 . 3 3 . 74 5

Best resut 67 points

lineations !"era#e resut 54 points ( 2.3)

$orst resut 30 points (2 o 28 aie&' i.e. 7%)

Foliations and lineations What makes a foliation?

!i#nment o minera #rains or #rain a##re#ates Foliation ( Foliation

Pat mineras' e.#. mica!n panar structure in a roc *attene& #rains o norma not+pat mineras e.#. ,uart- or

oi"ine

*attene& minera a##re#ates' e.#. pees in a &eorme& !ineation ( !inearcon#omerate

!n inear structure in a roc

!i#nment o structures

/toites soution seams

*oiations an& ineations must e Microractures

/ear an&sPenetrati"e + Not: sicensi&es

aut striations

"#am$le Another e#am$le

*oiation orme& &ierent mineras *oiation orme& *oiation orme&

*irous iroite (siimanite) "arin# crstao#rapic "arin# #rain si-eorientation Pat iotite "arin# minera

on#ate ,uart- #rains composition

%iagenetic & secondar foliations'rimar foliations ( 0

%iagenetic foliation orms sort ater se&imentation

Primar oiations orm as part o te ori#ina roc B compaction rotation o ca mineras

orma parae to e&&in#

econdar foliations orm ater a roc is itiie&' edimentar laering tectonic an& metamorpic processes

)agmatic laering

*hemical+mineralogical

aerin#

(

rtmic settin# o crstas)

Flo foliation

(

!i#nment o pat mineras)

/e&imentar ia#enetic oiation *irst rea tectonic oiation (/ ))agmatic laering in leucogranite, "l-a .sland1

aerin# (/ )0


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%isuncti/e clea/age *renulations9 small scale

ea"a#e orme& &issoution seams (stoites) in o+#ra&e

imestones' Biure' /pain renuations in ampioite+acies meta+peites' ap &e reus' /pain

xampe o crenuation o a

iotite oiation. !mpioite+*renulations9 micro4scale acies meta+peites' ap &e

reus' /pain

renuations in i#+#ra&e meta+peites' *inan&


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!mpioite+acies meta+

':4fa-ricpeites' ap &e reus'/pain

omination o crenuation''renuations are are "isie in an& soution transer can ea&

section crenuation ineationto a tectonic aerin# it

:uart-+ric aers ,uart-itic

:: :4domains

' Mica+ric aers peitic''4domains

:: ;ectonic aerin# is #enera"er re#uar' as oppose& to

! cear oiation orme& '' se&imentar aersai#nment o iotite' #arnet an&

eon#ate ,uart- #rains

:

;er coarse ':4fa-ric A#ial $lanar clea/age

ea"a#e norma &e"eops

perpen&icuar to maximum sortenin#

ea"a#e tereore usua &e"eops

parae to te axia pane ;ereore norma in 34$lane


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A#ial $lanar clea/ageA#ial $lanar clea/age

ontinuous gneissic cea"a#e in mi#matite' Masu =>i"iera=' *inan& !xia+panar crenuation cea"a#e in ampioite+acies rocs' ap &e reus' /pain

*lea/age refraction ( 1rechung *lea/age refraction

/ergence

ea"a#e as &ierent orientation in &ierent aers

ompetent larger an#e it aerin# ea"a#e in competent aers maes an#e it axia pane

?ncompetent smaller an#e it aerin# ;is pro&uces clea/age fans


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!ineations 4


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.ntersection lineations!ineations 4 2 =-ect lineations

and fold a#is

?ntersection o an axia panar cea"a#e it an o&er =-ect lineation an ineation orme& ai#ne&

oiation #i"es ou te o& axiso@ects it a inear sape

Aere to exampes o intersection ( ) ineations

Aggregate lineation >rain lineation )ineral lineation

*orme& inear *orme& eon#ate *orme& eon#ate

#rain a##re#ates #rains tat are #rains tat are norma

norma not inear in inear in sape (e.#.(e.#. pees)

sape (e.#. ,uart-) ampioes)00

Formation of o-ect lineations Formation of o-ect lineations

Passi"e rotation o ri#i& mineras or minera9riente& #rot o eon#ate mineras a##re#ates

(minor importance)

2/tretcin# o mineras an& minera a##re#ates

++ stretching lineation

(/trecun#sinear )

ommon in i#

strain sear -ones

C parae to D+&irection

o strain eipse

Ma#matic minera ineation o ai#ne& e&spars in #ranite' a ?san&


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2 tretching lineation !, , ! tectonites

;ectonite stron# &eorme& roc

4tectonite oiation &ominates

!4tectonite ineation &ominates

!4tectonite ot important

;e ineation in&icates te &irection

o maximum stretcin#

the tectonic trans$ort direction


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