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

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Fill

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Qal

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Qal

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Qt

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Qt

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4

Qb

c2

3

Qt

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p15

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1

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8

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p15

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i

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i

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i

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i

Qal

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i Qbf33

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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

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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