Petrologi Batuan Piroklastik (1)

8/18/2019 Petrologi Batuan Piroklastik (1)

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PETROLOGIPETROLOGIBATUANBATUAN

PIROKLASTIKPIROKLASTIK


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Hasil letusan gunungapi (direct blast) Terdiri dari pecahan-pecahan ( pyroclast )

ENDAPAN PIROKLASTIK

Pr!clastic "all dep!sits Pr!clastic #!$dep!sits Pr!clastic surgedep!sits

Endapan%ul&ani&lasti& Lapuk

Tererosi diendapkan

BATUAN SEDIMENVULKANIS

BATUAN PIROKLASTIK

LITIFIKASI

Batupasir, konglomerat, batulempung, dll

Tuf, aglomerat, breksi piroklastik


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1. Endapan (at&)an Pro*last*1. Endapan (at&)an Pro*last*

S"+aran m"n'*&t topo'ra!S"+aran m"n'*&t topo'ra! U*&ran +&tran m"n')al&s, lapsanU*&ran +&tran m"n')al&s, lapsan

m"nps m"na&) p&sat "r&psm"nps m"na&) p&sat "r&ps Str&*t&r 'rad"d +"ddn' normal danStr&*t&r 'rad"d +"ddn' normal dan

r"/"rs"r"/"rs" Komposs p&mc", scora, a+&0d"+&,Komposs p&mc", scora, a+&0d"+&,

s"d*t lapls"d*t lapl Macam-macam scora-!all d"post,Macam-macam scora-!all d"post,

p&mc"-!all d"post, as)-!all d"postp&mc"-!all d"post, as)-!all d"post


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#. Endapan Alran Pro*last*#. Endapan Alran Pro*last*

Endapan alran d"+& dan +alo*0+lo*Endapan alran d"+& dan +alo*0+lo* T"rdr dar lapl /"s*&l"r dan d"+&T"rdr dar lapl /"s*&l"r dan d"+& Sortn' +&r&* +&tran m"ny&d&tSortn' +&r&* +&tran m"ny&d&t S"+aran tda* m"rata m"n"+al d +a'an l"m+a)S"+aran tda* m"rata m"n"+al d +a'an l"m+a) S"rn'*al +"rasosas d"n'an la/a rolt*, dast*,S"rn'*al +"rasosas d"n'an la/a rolt*, dast*,

and"st*and"st* Endapan alran scoraEndapan alran scora

2domnas ol") lapl scora2domnas ol") lapl scora

Komposs and"st*, +asalt*Komposs and"st*, +asalt* Endapan alran p&mc"Endapan alran p&mc"

Komposs dast*, rolt*Komposs dast*, rolt* Lapl, +lo*, p"ca)an '"las +"rt"*st&r p&mc"Lapl, +lo*, p"ca)an '"las +"rt"*st&r p&mc"


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%. Endapan S&r'"%. Endapan S&r'"

Endapan +as" s&r'"Endapan +as" s&r'" B"rasosas d"n'an "ndapan at&)anB"rasosas d"n'an "ndapan at&)an

Endapan 'ro&nd s&r'"Endapan 'ro&nd s&r'" B"rasosas d"n'an "ndapan alranB"rasosas d"n'an "ndapan alranpro*last*pro*last*

Endapan as)-clo&ds s&r'"Endapan as)-clo&ds s&r'" Basanya d +a'an atas "ndapan alranBasanya d +a'an atas "ndapan alran

pro*last*pro*last*


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BATUAN PIROKLASTIKBATUAN PIROKLASTIK

Bat&an )asl l"t&san '&n&n'apBat&an )asl l"t&san '&n&n'ap T"rdr dar mat"ral pro*las T"rdr dar mat"ral pro*las

P"ca)an '"las, *rstal, lt*0+at&an /ol*an*P"ca)an '"las, *rstal, lt*0+at&an /ol*an* U*&ran +&tran U*&ran +&tran

d"+& 34 #mm5, Lapl 3# 6 78 mm5, +lo* dand"+& 34 #mm5, Lapl 3# 6 78 mm5, +lo* dan+om 39 78mm5+om 39 78mm5 (Schmid, 1981 ; Fisher, 1984)(Schmid, 1981 ; Fisher, 1984)


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Bat&an pro*last*Bat&an pro*last* Bat&an yan' ds&s&n ol") mat"ral-mat"ral yan' d)asl*an ol")Bat&an yan' ds&s&n ol") mat"ral-mat"ral yan' d)asl*an ol")

l"t&san '&n&n' ap.l"t&san '&n&n' ap. 2cr*an ol") *")adran mat"ral pro*las yan' domnan 3'"las,2cr*an ol") *")adran mat"ral pro*las yan' domnan 3'"las,

*rstal, +at&an /ol*an*5, +&tran yan' m"ny&d&t, porostas yan'*rstal, +at&an /ol*an*5, +&tran yan' m"ny&d&t, porostas yan'r"lat! tn''.r"lat! tn''.

Bat&an Ep*last* Bat&an Ep*last* Bat&an )asl rom+a*an +at&an /ol*an* ma&p&n +at&an lannya.Bat&an )asl rom+a*an +at&an /ol*an* ma&p&n +at&an lannya. T"rdr dar mat"ral )asl rom+a*an +at&an 3*rstal, !ra'm"nT"rdr dar mat"ral )asl rom+a*an +at&an 3*rstal, !ra'm"n

+at&an5 dan mat"ral non /ol*an*.+at&an5 dan mat"ral non /ol*an*.


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FRAGMEN PIROKLASTIK DAN ENDAPAN

'ragen pir!&lasti& (pir!&las) "ragen *erasal dari erupsi gunungapi (hasil langsung

pr!sesgunungapi)

+aca pir!&las *erdasar&an ter,adina juvenile pyroclasts hasil langsung a&i*at letusan e*e&u diperu&aan

(fragmen gelas kristal ir!"enik )

cognate pyroclasts fragmen #at$an hasil erupsi terdahulu (dari gunungapiangsaa)

accidental pyroclasts fragmen #at$an *erasal dari *aseent (&!p!sisi*er*eda)


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Klas!*asKlas!*as

2asar &*&ran +&tran2asar &*&ran +&tran P"namaan t&!, t&! lapl, a'lom"rat,P"namaan t&!, t&! lapl, a'lom"rat,

+r"*s pro*last* ata& +r"*s /ol*an*+r"*s pro*last* ata& +r"*s /ol*an* Unt&* +at&an +"r+&tr )al&s 348mm5 Unt&* +at&an +"r+&tr )al&s 348mm5 t&! '"las, t&! *rstal, t&! lt*t&! '"las, t&! *rstal, t&! lt*


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ukuran piroklas en!apan piroklastik

Tefra (tak terkonsoli!asi Batuan piroklastik

(terkonsoli!asi

/ &4 mm Bom, blok 0apisan bom blokTefra bom atau blok

glomerat, breksi piroklastik

2 3 &4 mm lapili 0apisan lapili atauTefra lapili

Batulapili (lapillistone

11& 3 2 mm bu!ebu kasar bu kasar Tuf kasar

11& mm bu!ebu halus bu!ebu halus tuf halus

%S&'mi() *+,*-


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Batuan piroklastik (ter!iri!ari bahan piroklas

Tufit (campuranpiroklastik ' epiklastik

Batuan epiklastik(ter!iri !ari rombakanbatuan vulkanik !anatau non vulkanik

kuran rata6rata

glomerat, breksipiroklastik,

batulapili,

tuf kasar,tuf halus

7onglomerat tufaan,breksi tufan

Batupasir tufanBatulanau tufanBatulumpur tufan, serpihtufan

7onglomerat, breksi

Batupasir BatulanauBatulumpur, serpih

&4 mm

2 mm11&125&

188 +5 25 8

Arah pening&atan . pir!&las arah pening&atan epi&las

Epiklas vulkanik & non vulkanikserta bahan sedimen lainnya

piroklas

Klasifkasi Schmid, 1981


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/re&si tu"

/re&sipir!&lasti&

Tu" lapili

tu" *atulapili

/!*l!&

lapili de*u

(011.)

(011.) (011.)

% klasi.kasi Fis'er) *+//-


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TufGelas

TufLitik

TufKristal

Gelas

Litik Kristal

:;


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=al 6 )al yan' p"rl& dd"s*rps dalam=al 6 )al yan' p"rl& dd"s*rps dalam+at&an pro*last*+at&an pro*last*

>arna, d"s*rps*an $arna +at&an yan' r"pr"s"ntat!>arna, d"s*rps*an $arna +at&an yan' r"pr"s"ntat!

B"sar +&tr, d"s*rps*an m"n''&na*an +"sar +&tr0&*&ran *last +at&an pro*last*B"sar +&tr, d"s*rps*an m"n''&na*an +"sar +&tr0&*&ran *last +at&an pro*last* Kompon"n, d"s*rps*an *ompon"n +at&an pro*last* Kompon"n, d"s*rps*an *ompon"n +at&an pro*last*

- Krstal, !ra'm"n *rstal- Krstal, !ra'm"n *rstal

- ?ra'm"n lt* /ol*an* ata& non /ol*an*, polm* ata& monom*- ?ra'm"n lt* /ol*an* ata& non /ol*an*, polm* ata& monom*

- P&mc" ata& scora- P&mc" ata& scora

- S)ards, lapl a*r"sonar, /tr*las- S)ards, lapl a*r"sonar, /tr*las

- S"m"n sls"o&s, *ar+onat ata& @"olt.- S"m"n sls"o&s, *ar+onat ata& @"olt. Lto!as"s Lto!as"s

- Mas! 3tda* +"rlaps5 ata& +"rlaps- Mas! 3tda* +"rlaps5 ata& +"rlaps

- B"rlaps Lamnas 4 1cm- B"rlaps Lamnas 4 1cm

B"rlaps san'at tps 1 6 %cmB"rlaps san'at tps 1 6 %cm

B"rlaps tps % 6 1;cmB"rlaps tps % 6 1;cm B"rlaps s"dan' 1; 6 %;cmB"rlaps s"dan' 1; 6 %;cm

B"rlaps t"+al %; -1;;cmB"rlaps t"+al %; -1;;cm

B"rlaps san'at t"+al 9 1;;cmB"rlaps san'at t"+al 9 1;;cm


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- Mas! 3tda* +"r'radas5 ata& +"r'radas - Mas! 3tda* +"r'radas5 ata& +"r'radas

normal r"/"rs" normal-r"/"rs" r"/"rs"-normalnormal r"/"rs" normal-r"/"rs" r"/"rs"-normal

- K"mas clast-s&pport"d ata& matr-s&pport"d,- K"mas clast-s&pport"d ata& matr-s&pport"d,

t"rpla) +a*, t"rpla) s"dan', t"rpla) +&r&*t"rpla) +a*, t"rpla) s"dan', t"rpla) +&r&*- K"*ar +loc*y, prsmat*, col&mnar, platy- K"*ar +loc*y, prsmat*, col&mnar, platy

- K"t"+alan lat"ral rata ata& tda* rata- K"t"+alan lat"ral rata ata& tda* rata

- S"cara lat"ral m"n"r&s ata& tda* m"n"r&s- S"cara lat"ral m"n"r&s ata& tda* m"n"r&s

- ross-+"dd"d, cross-lamnat"d- ross-+"dd"d, cross-lamnat"d

Alt"ras Alt"ras - Mn"ralo' *lort, s"rst, sl*a, prt, *ar+onat, !"ldspar, )"matt- Mn"ralo' *lort, s"rst, sl*a, prt, *ar+onat, !"ldspar, )"matt

- 2str+&s- 2str+&s


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B"+"rapa p"rstla)anB"+"rapa p"rstla)an

La)ar La)ar Endapan alran pro*last* d"n'an m"da ar 3dEndapan alran pro*last* d"n'an m"da ar 3d

s&n'a, a*+at ar )&an dll5s&n'a, a*+at ar )&an dll5

Sortas +&r&*Sortas +&r&*

B"r)&+&n'an lan's&n' d"n'an "r&ps lan's&n'B"r)&+&n'an lan's&n' d"n'an "r&ps lan's&n'ma&p&n tda* lan's&n'ma&p&n tda* lan's&n'

Sama s"*al tda* ada *atannya d"n'an "r&psSama s"*al tda* ada *atannya d"n'an "r&ps'&n&n'ap mo+ltas dar "ndapan t"!ra pada l"r"n''&n&n'ap mo+ltas dar "ndapan t"!ra pada l"r"n'

ta* sta+l5, conto) a*+at '"mpa +&mta* sta+l5, conto) a*+at '"mpa +&m Ep*last*0"pclast mat"ral )asl rom+a*anEp*last*0"pclast mat"ral )asl rom+a*an

+at&an t"rda)&l&+at&an t"rda)&l&


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Bat&an "p*last* +at&an yan' t"rdr dar mat"ralBat&an "p*last* +at&an yan' t"rdr dar mat"ral)asl rom+a*an +at&an t"rda)&l& 3t"rmas&* +at&an)asl rom+a*an +at&an t"rda)&l& 3t"rmas&* +at&an/ol*an*5, conto) +at&pasr /ol*an*/ol*an*5, conto) +at&pasr /ol*an*

Bat&an pro*last* Bat&an pro*last* Pro*las p"ca)an )asl l"t&san '&n&n'apPro*las p"ca)an )asl l"t&san '&n&n'ap 2"!ns +at&an t"rdr dar pro*las2"!ns +at&an t"rdr dar pro*las onto) t&!, +r"*s pro*last*onto) t&!, +r"*s pro*last*

Bat&an s"dm"n t&!anBat&an s"dm"n t&!an Bat&an s"dm"n yan' m"n'and&n' camp&ranBat&an s"dm"n yan' m"n'and&n' camp&ran pro*laspro*las onto) +at&pasr t&!an 3+&tran pasr m"ncapa C;


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Petrologi Batuan Piroklastik (1)

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