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'-,': /' .usually.s- oftandweathersapiOlfntoa slope.Most hale s ratified. lackshalesrUSUally.iSOftand'weathefSraptdly ntOa Slope. MOSISnale slyen strdtrrrvu',- 'o, 'o"?
""'' '
,nic'ateri'uno.ccumulaten a varye[f'#ui"t-*aternyil'onmqnts
yei richn orga , ., /.(lagoons,estrictedji'iiattoweas,' tc.).Redt -
r - / " i I : : , r
: . / / ' l r
are colouredwltrl--tl-on,oxloe,anoii , .y ' '1 , '. . ; " i -,indicateoxidi"Zingonditionsn lhe environmentsni ,/ I
- l: l. ', .""..,1'changeKlftooda ns).
/(, / l ; : . ' i
identified , ' . l i 'a mrcroscope
/ ' 1 ../EXAMPLESFCHEMICALANDORGAN'CSEDIMENTARYOCKS, l
1.LI,MESTONE-s composed ainly fcalciumarbonatec
by bothchemioaind
andoriginates
and organicprogedses. hey have a great of rockextures nd
_ i 1carbpnate aMg(CO3).t'sgffiarto'limestonenmgst'texturalndstruitural,tqaturesnd,r' :, I ' , . , . i , , t /
in generalappearance. t can develop r
n n imetsones: . : I3. ROCKSALTANDGYPSU
calciumn imetsones:
osedofthemi
||UM.Rocksalt s composedyineral alite NaCl).t
dolos
r r r rformsby evaporationn salineakes GreatSaltLake,DeadSeq)or in restrictedays
: l
along he shoreof the ocean.Gypsums composed f CaSO+'2HzOnd'originatesroml . , , . r i ;
evaporatioh:t collects nlayersas calcium utphate recipitates. i' , : , ' , ,' i
": ' i^ n | "r.\'
4.4MetamorphicRocks ft"&rnn[.X)i , i i : . , i : i
. r
;,1 rlt"t"morptlicbcksget thei,rame.fromhe Greek meta" nd"morphe'"rmeaningl i"chahgeiform".'Themineralsn an gneousockortheparticles:insedimeqtaryockr:
I , ,
under xtreme onditions fpressre r temperatureanchange nd ecrystallizentoa: . . i
newrckcalleda metamorphicock.Such conditionsan existduringmountain-bui lding
processes. ther metamorphicocksare formedwhen rockssurrounding hot igneous
massare baked" y theheat .Thereare two typesof metamorphicocks: egionalmetamorphicocksand hermal
' l :
metamorphicocks.
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Differentegrebs f pressure roduce ifferentrades f metamorphicocks'Slightt - : - - - - - t - : ^ L r L ^ . ^ ^ 1 .
pressure 1proouce
low-grade etamorphicock n whichhe, nlydiffer:enceill be '
i '
that heminerals ill havebeen ealignedn a differentirection.ften hisproduceslat; r ' ; r l - - - - - - - = L
crys{als{:micahat re oriented ccordingo thedirectionl the applied ressure--"n",iresults a rock hat hasplanes fweaknessunningn onedirectionndwhich ansplit,'
: ; . , ! , , ' , i ' : ' ' . i l , l ' . f i - ' , r ' _ 1 . ieasiiy nto"flatlabs (e .g .slate, 'phyll i te).n tensepressurewillcompletelyhange he1, i
'
t
, t | - -
:
mtneralogrcarakeup of the roik and produce a high-grademetamorphicrock.The,:chemicalomponents ayrecrystallizentoa totally ifferentuiteof miner'tslomithq
' , i i | i ' i . r i i ' , iI : : - | : ' r ' I
from: her
originaloct
