PRELIMINARY GEOLOGIC MAP OF MT. PAGAN VOLCANO, PAGAN ISLAND,
COMMONWEALTH OF THE NORTHERN MARIANA ISLANDS
By
By Frank A. Trusdell, Richard B. Moore, and Maurice K. Sako
2006
CONTOUR INTERVAL 10 MDATUM IS MEAN SEA LEVEL
SHORELINE SHOWN REPRESENTS THE APPROXIMATE
LINE OF MEAN HIGH WATER
Projection UTM 55N
Datum WGS84
MA
GN
ET
IC
NO
RT
H
1
APPROXIMATE MEANDECLINATION, 2006
TR
UE
N
OR
TH
Gray margin along periphery of the map is a digital elevation model.
Open-File Report 2006-1386
Caldera boundary
50
100
100
100
100
_̂
_̂̂__̂
_̂
_̂
10,780 yrs
235 yrs 130 yrs
50 yrs
235 yrs
_̂170 yrs
105 yrs
_̂
110 yrs
370 yrs_̂
_̂
600 yrs
Pag- 94-01
TM-01-14
TM-01-05c
MM-92-33
MM-92-100
Pag-94-02
TM-01-11c TM-01-10cTM-01-09c
Qbf3
Qbp5
Qbf1
Qbap15
Qbf6
Qbf21
Qbf7
Qbf1
Qal
Qbf3
Qbap15
Qal
Fill
Qbf3
Qbc1
Qbp1
Qbf22
Qbf2
Qal
Qbf30
Qbf7
Qal
Qbc1
Qbf38
Qbc6
Qbap15
Qbp5
Qbf1
Qbp5
Qbc7
Qbc14
Qal
Qbc7
Qbp1
Qt
Qbp2
Qbf3
Qbf11
Qbf4
Qt
Qbap32
Qbp5
Qbf31
Qbf30
Qbc4
Qbcf24
Qbf2
Qbap15
Qbp5
Qbf3
4
Qb
c2
3
Qt
Qt
Qbp5
Qal
Qbc10
Qbf30
Qbp1
Qbp5
Qb
Qv26
Qba
p15
Qbap15
Qbf
1
Qbp5
Qbp5
Qbf36
Qbf3
8
Qbap15
Qt
Qbc12
Qba
p15
Qb
Ql
Ql
i
Qaf29
Qt
Qb
Qb
Ql
Ql
Qb
Ql
Qb
Qbf37
Qt
Qb
Qbf19
Qb
i
Qap20
Qal
Qb
Qbf10
i
Qaf16
Qv26
Qb
Qbf2
Qal
Qt
i
Qal
Qbf28
Qbf18
Qt
Qt
Qb
Qbcf25
Qbf27Qb
Qbf33
Qb
i Qbf33
Qbf35
Qbf17
Qbp1
Qbf21
Qbc9
Qbc8
Qt
Qbf18
Qt
Qt
Qbf2
Qt
Qbc13
Qbf32
Qbap15
50
100
20
0
300
40
0
500
500
50
50
50
50
200
200
50
100
100
50
100
20
0
50
50
100
50
100
50
200
Qbf6
Qbf6
Qbf1
Qbf6
Qbp5
Qbp5
Qbp5 Qbp5
Qbp5
Qbf1
Qbf3
Qbf3
Qbf3
Qbf7
Qbf1
Qbf1
Qbap15
Qbap15
Qbap15
50
100
50
Qbf21
Qbf21
Qbf21
A.D. 1872-1873
A.D. 1872-1873
A.D. 1925
Qb
Mount PaganCORRELATION OF MAP UNITS
0-150 years old(A.D. 1872 and younger)
150-10,000 years old
LAVA FLOWS AND VENT DEPOSITS
QUATERNARY
Holocene
Qbf18
Qbc23
Qbf27 Qbf28
Qbf30
Qbf34 Qbf36 Qbf37
i
Qal Qt Qb Fill A.D. 1925
A.D. 1981
A.D. 1872-1873 Qbf3
Qbc9
Qbf38
Qaf2910,780 +/- 200 years B.P.
Qbf33
Qbc6
Qbf11
Qbc12
Qbap15
Qbf17Qaf16
235 ± 35 years B.P.
Qap20
Qbf19
Qbf21
Qbf22
Qbf35
Qbap32
Qbf31
Pleistocene
Qbp5
105± 35 years B.P.
Ql
Qbc1 Qbf1 Qbp1
Qbp2 Qbf2
Qbc4 Qbf4 Qbc7 Qbf7
Qbc10 Qbf10Qbf6
Uncorrelated Units
Qv26Qbcf24
Qbc8
Qbc13
Qbf32
SEDIMENTARY DEPOSITS
Qbcf25
?
10,000-2 million years old
Recent
? = base of flow concealed.
Undated flows are correlated to dated flows using superpostion; surface exposure; color change do to solar radiation; extent of weathering; tree height, size, and girth; diversity of native plant species; and soil and ash accumulation.
Units that are stacked show direct superposition relations (young over old flows).
??
?
???
?
?
?
?
Qbc14
?? ?
?
?
?
?
? ?
? ? ? ?
?
??
600 ± 89 years B.P.370 ± 60 years B.P.
All ages are reported in radiocarbon years before present (yr B.P., before the calendar year datum of A.D. 1950)
18 10' 00"º
145 45' 00"º
18 05' 00"º
145 45' 00"º 18 05' 00"º
145 47' 30"º
145 47' 30"º
18 10' 00"º
Marasu
Talage
Regusa
Lukairu
Baranka
Bandeera
Peninsula
Shomushon
Hira Rock
Kanat Dagu
Unaidikiki
Chalan Talu
Miari Cliff
Puntan Gagu
Togari Rock
Apansantate
Apansanmeena
Barankan
Talu
Barankan Lanchu
Apaan
Sanmena
1981 Lava Flows
Laguna
Sanhiyon
Laguna Sanhalom
Butkan Kanat
Dagu
Mt. Pagan
1981 Lava Flows
1981 Lava Flows
Sengao Peninsula
NambuLegend
100m contour
littoral deposits
maar
phh
spatter
surge
tuff
tuff breccia
undiff pf
_̂
1 Kilometer
Radiocarbon locality All ages are reported
in radiocarbon years
before present
(yr B.P., before the
calendar year datum
of A.D. 1950)
10m contour