66
a
r;-c;~,- ASH ,:!:GRADED
1:>7~~~ SOll HOAIZON
b
l AHAR
c
IDEALIZED COMPLETE SUCCESSION
OF ONE ERUPTION EPISODE
l AVA FlOW
,-,=--=-r-AIR·FAll ASH
f:":"<~"- ASH · ClOUD SURGE DEP .
PYROClASTIC
FlOW UNIT (2)
LlTHOClASTS
GAOUND SURGE DEP. ( 1)
PLiNIAN FAll DEP.
T
1·5
m
1
Chapter 2 Continental Sediments
PUMICE
. . 0 .
~;"j •.. ":. GAADING
IN SOATING
LlTHOClAST
INCREASE
/
\l=00UB' "
· ;n\: NORMAL GRAD.
BAlLiSTIC ClAST (BOMB)
PYROClASTIC FlOW
DEPOSIT (BLOCK AND
ASH FLOW, SCORIA FlOW,
PUMICE FlOW OA
IGNIMBAITE)
l AHAA (DEBAIS OR MUD FlOW)
MAIN TYPES OF PYROCLASTIC FLOW DEPOSITS (PROXIMAL)
BlOCK ·AND
: i:,'· :~',:
PUMICE·FlOW
SCORIA
OEPOSITS OA
ASH·FlOW
OEPOSITS
IGNIMBRITES
DE POSITS
VESICUlATED
GAS
BASALTIC·
SEGGAEGATION
DENSE
ANDES ITIC
PIPE
ANDESITIC
Cl ASTS
PUMICE
ClASTS
ClASTS
FINE GRAINED
GROUND
BASAL lAYER
SUAGE OEP