curs 03 - old.unibuc.roold.unibuc.ro/prof/roban_r_d/docs/2013/noi/12_10_23_58c03_ssd... ·...
TRANSCRIPT
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Curs 03 Morfofaciesul sedimentar
Sedimentologie si sisteme depozitionale Lect. dr. Relu D. Roban
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Morfometrie - analiza formei particulelor sedimentare (clastice)
Morfoscopie - analiza suprafetei particulelor sedimentare (clastice)
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Morfometrie
Metode de analiza
Parametrii morfometrici
Categorii (clase) morfometrice- diagrame specifice
Interpretarea sedimentologica a parametrilor morfometrici
Morfoscopie
Metode de analiza
Forme ale suprafetelor
Semnificatii sedimentologice
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Morfometrie
Metode de analiza
Parametrii morfometrici
Categorii (clase) morfometrice- diagrame specifice
Interpretarea sedimentologica a parametrilor morfometrici
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Metode de analiza:
• Masuratori directe cu sublerul- categorii ruditice
• Masuratori la lupa binoculara- categorii ruditice fine si arenitice
Anastasiu si Jipa, (1983)
Cheel, (2006)
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Se alege proiectia ariei maxime-
mulaje gips
Cheel (2005)
Exemplu de masuratori
Blott and Pye, (2008)
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Parametrii morfometrici
• Sfericitate
• Elongatie
• Aplatizare
• Rotunjime
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Riley Sphericity (ψR)
Sfericitate
Sneed and Folk Sphericity (ψP)
Wadell’s Sphericity
c
iRiley
d
d
3
2
IL
SFolkSneed
dd
d
32
L
SIWadell
d
dd(ψW)
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Elongatia sau alungirea L
I
d
dAl
Aplatizarea
S
IL
d
ddAp
2
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Rotunjime (Roundness)
unde :
r = razele de curbura ale cercurilor inscrise in colturi,
N=numarul colturilor inclusiv al celor cu r=0
R=raza celui mai mare cerc inscripribil
R
rRoWentworth
1 unde : r1=raza celui mai mic cerc inscris in colt iar
R=(dL+dS)/4
L
Cailleuxd
rRo 12
unde : r1=raza celui mai mic cerc inscris in colt iar
dL = diametrul lung
NR
rRoWadell
)(
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Categorii (clase) morfometrice- diagrame specifice
Diagrama Zingg
Diagrama Sneed and Folk
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Sneed and Folk (1958) classification of grain form
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Comparatorul vizual Power
Comparatorul visual Power (1953) pentru aprecierea rotunjimii Wadell (Rw). ρ reprezinta transformarea
logaritmică a Rw în numere întregi în Cheel (2005)..
NR
rRoWadell
)(
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Comparator vizual pentru aprecierea simultana a indicelui de rotunjime (Ro) si a indicelui
de sfericitate (Sf) dupa Krumbein si Sloss din Anastasiu si Jipa (1983)
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Interpretarea sedimentologica a parametrilor morfometrici
Forme primare-------------------Forme derivate
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Forma clastelor
factori de control
Natura petrografica
Distanta/timpul/gradul de prelucrare
Textura
Structura
Mineralogie
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Forma vs structura
Structura masiva:
Structura sistuasa
Stratificata, laminata:
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Relatia dintre structura si textura initiala si formele derivate dupa transport si acumulare
Anastasiu si Jipa (1983)
Sf>
Sf<
Sf>
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Anastasiu si Jipa (1983)
Relatia dintre structura si textura initiala a litoclastelor magmatice si formele derivate dupa transport si acumulare
1.granodiorit, 2. granodiorit porfiric, 3. microdiorit porfiric, 4. microgabbro,
5.aplit, 6. 7. lamprofir, 8. trahit. 9. perlit., 10. bazalt., 11. tinguait., 12. foidit
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Relatia dintre structura si textura initiala a litoclastelor metamorfice si formale derivate dupa transport si acumulare
Anastasiu si Jipa (1983)
1. Filit cuartito- cloritos; 2. micasist cloritos; 3. micasist cu granati., 4. micasist cu sillimanit
5. Gnais ocular, 6. Amfibolit., 7. Serpentinit, 8 Marmura
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Granoclaste: minerale grele
Forme initiale forme derivate
Anastasiu si Jipa (1983)
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Cheel (2005)
Date experimentale: evolutia rotunjimii si sferiticatii
Pentru calcare si silicolite, rotunjimea evolueaza f. mult in primii 50 km
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Glaciar
Fluviatil
Costier
Marin
Medii sedimentare
Forme initiale
si
Forme derivate
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Zaton- claste aplatizate – argilite
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Sfericitate
Litoclaste sedimentare (calcare) –sferice
Litoclaste metamorfice - discoidale, lamelare
Rotunjime
Litoclaste sedimentare (calcare) –rotunjite
Litoclaste metamorfice – rotunjite- subrotunjite
Conglomerate de Ceahlau, Cretacic inferior
Diagrama Sneed şi Folk
(1958), din Grasu et al.
(1996)
5 probe a cate 150
galeti calcaroşi cu
granulometrie cuprinsa
intre 22-80 mm.
După sfericitate şi contur
– dispersie mare, insa
sugereaza un mediu
marin
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Conglomerate de Bucegi, Cretacic inferior
Clastele mari sunt mai rotunjite
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Morfoscopie
Forme ale suprafetelor:
Metode de analiza: lupa, microscop electronic
Forme pozitive: creste, varfuri, suprafete plane si curbe
Forme negative: depresiuni - cratere, striuri
Natura suprafetelor: Mecanica: zgarieturi, ciocniri
Chimica: dizolvari, precipitari
Biotica: sfedeliri, bioprecipitari, incrustatii
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Luciul
(granoclaste)
Sticlos
Adamantin
Semimetalic si metalic
Granule prelucrate- luciu mat
Semnificatii
sedimentologice
Zgarieturi – transport subnival, subacvatic prin
tarare si rulare
Cratere de impact: transport subaerian
Transport subacvatic prin saltatie si suspensie
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Nichols (2009)
Maturitatea texturala a arenitelor