FIELD TRIPEocene Accretion of Siletzia, SW Oregon

GEOL 440/540 - Sedimentary Basin AnalysisOctober 6-7, 2018

Schmandt & Humphreys (2011)

Sile

tz T

erra

ne

Umpqua

TyeeFormation

Eugene

Klamath MountainsAccreted Terranes

(Mesozoic)

EocenePayne CliffsFormation(fluvial)

Medford

Western C

ascades Volcanics

GrantsPass

Walker and MacLeod (1991)

360 km

SRV

SRV

SRV

Tyee

Fm

Cre

tace

ous

Dot

han

Fm

(F

ranc

iscan

equ

ivalen

t ?)

Arch

Umpqua Group

Roseburg

Glide

W.F.

PALEOCURRENTS:

Tyee FormationSantra et al., 2013Snavely et al. 1964Heller, 1983

Umpqua GroupRyberg, 1984

Heller(1983)

Geologic Map of SW Oregon

53.5

52.0

50.5

49.0

46.5

Age

(Ma)

Umpqua GroupTyee Fm

Bus

hnel

l Roc

k Fm

(con

glom

erat

e)

Tenm

ile F

m (t

urbi

dite

s)

Whi

te T

ail R

idge

Fm

(sha

llow

mar

ine

delta

ic)

Tyee

For

mat

ion

(fluv

ial,

delta

ic,

& m

arin

e tu

rbid

ites)

Sile

tz R

iver

Vol

cani

cs

Ryu

& N

iem

199

9 (a

ges

from

Wel

ls e

t al.,

201

4)

Eoc

ene

Stra

tigra

phy

of S

W O

rego

nN

WS

E

Sile

tz R

iver

Basa

lts

Tyee

For

mat

ion

mar

ine

turb

idite

s

Tenm

ile F

m

mar

ine

turb

idite

sV

ertic

al S

cale

feet

01000

2000

3000

01000

meters

Whi

te T

ail R

idge

&C

amas

Val

ley

Fms.

Del

taic

& s

hallo

w m

arin

e

Umpqua Group~ 3400 meters

Bush

nell R

ock

Fm

Dat

um: b

ase

of T

yee

Fm.

km0

10

App

roxi

mat

e H

oriz

onta

l Sca

le

Eoce

ne U

MPQ

UA

BA

SIN

SW O

rego

n

Dat

a fro

m R

yu e

t al.

(199

2)

18#4

#5

#8

9

14

VE

~ 1

0:1

Col

lisio

nal O

roge

n &

For

edee

p B

asin

Sin

clai

r (20

12)

Hel

ler &

Ryb

erg,

198

3 (p

re- t

o sy

n-co

llisi

on)

UM

PQU

A Fo

rede

ep B

asin

: Fl

exur

al S

ubsi

denc

e R

espo

nse

to T

hrus

t Loa

ding

San

tra e

t al.

2013

Tyee

For

mat

ion:

Rec

onst

ruct

ion

Bra

id

Stre

ams

~54

Ma Ryu

& N

iem

199

9

49 M

a 46.5

Ma

Subs

iden

ce H

isto

ry

Bra

id

Stre

ams

Stre

ams

Sing

le P

hase

of

Rap

id S

ubsi

denc

e

Impl

ies

sam

e dr

ivin

g fo

rce

(thru

st lo

ad) f

or

Um

pqua

Gp .

and

TYE

E

~ 0.

9 km

/Myr

(m

m/y

r)

Det

rital

Zirc

on A

ges

San

dsto

ne P

etro

grap

hy

Mon

tgom

ery

Cre

ek F

m.

Col

umbi

a Em

baym

ent:

ocea

nic

crus

t, Fa

rallo

n pl

ate

Tyee Fm

Sour

ce o

f the

TYE

E FO

RM

ATIO

N: K

lam

ath

Mts

. or I

daho

Bat

holit

h ?

Cascadia Subduction Zone Cascadia Subduction ZoneCascadia Subduction Zone

Kin

g &

Bei

kman

(197

4)

Blu

e M

ts.

I.B.

Bas

in &

Ran

ge (C

z)

Ch.

PC

WISZ

? Em

baym

ent:

Blu

e M

ts.

Blu

e M

ts.

Emba

ymen

t: oc

eani

c cr

ust,

Fara

llon

plat

e Fa

rallo

n pl

ate

Fara

llon

plat

e oc

eani

c cr

ust,

Fara

llon

plat

e Fa

rallo

n pl

ate

Col

umbi

a C

olum

bia

Col

umbi

a Em

baym

ent:

Emba

ymen

t: Em

baym

ent:

??Em

baym

ent:

Emba

ymen

t: Em

baym

ent:

??Em

baym

ent:

Emba

ymen

t: Em

baym

ent:

ocea

nic

crus

t, oc

eani

c cr

ust,

ocea

nic

crus

t, Fa

rallo

n pl

ate

Fara

llon

plat

e Fa

rallo

n pl

ate

ocea

nic

crus

t, Fa

rallo

n pl

ate

??

Kla

mat

h M

ts.

Nor

th

Cas

cade

s Cl.

Blu

e M

ts.

Bac

hman

19

82

Aal

to

1988

McK

nigh

t 19

84

Sna

vely

et

al. 1

964

Prov

enan

ce

Hyp

othe

sis

Mai

n D

ata

Type

s R

efer

ence

s

Kla

mat

h M

ts.

(o

rigin

al)

Sst

pet

rogr

aphy

C

last

com

posi

tions

P

aleo

curr

ent d

ata

Sna

vely

et a

l., 1

964;

B

achm

an, 1

982;

McK

nigh

t, 19

84; A

alto

, 198

8

Idah

o B

atho

lith

Sst

pet

rogr

aphy

Is

otop

e ge

oche

mis

try

Det

rital

mic

a ag

es

Det

rital

zirc

on a

ges

Hel

ler &

Ryb

erg,

198

3;

Hel

ler e

t al.,

198

5, 1

992;

R

enne

et a

l. 19

90;

Dum

itru

et a

l., 2

013

Kla

mat

h M

ts.

(r

econ

side

red)

Sst

pet

rogr

aphy

P

aleo

curr

ents

& F

acie

s S

ubsi

denc

e an

alys

is

Sed

im. m

ass

bala

nce

Ryu

et a

l, 19

92; R

yu 1

995;

R

yu a

nd N

iem

, 199

9;

San

tra e

t al.

2013

; Th

is S

tudy

Prov

enan

ce

Hyp

othe

sis

Mai

n D

ata

Type

s R

efer

ence

s

Kla

mat

h M

ts.

(o

rigin

al)

Sst

pet

rogr

aphy

C

last

com

posi

tions

P

aleo

curr

ent d

ata

Sna

vely

et a

l., 1

964;

B

achm

an, 1

982;

McK

nigh

t, 19

84; A

alto

, 198

8

Idah

o B

atho

lith

Sst

pet

rogr

aphy

Is

otop

e ge

oche

mis

try

Hel

ler &

Ryb

erg,

198

3;

Hel

ler e

t al.,

198

5, 1

992;

R

enne

et a

l. 19

90;

Dum

itru

et a

l., 2

013

Kla

mat

h M

ts.

(r

econ

side

red)

Sst

pet

rogr

aphy

P

aleo

curr

ents

& F

acie

s S

ubsi

denc

e an

alys

is

Sed

im. m

ass

bala

nce

Ryu

et a

l, 19

92; R

yu 1

995;

R

yu a

nd N

iem

, 199

9;

San

tra e

t al.

2013

; Th

is S

tudy

Tyee

For

mat

ion

detri

tal

mic

as

McK

nigh

t 19

84

Sna

vely

et

al. 1

964

Kla

mat

h McK

nigh

t M

cKni

ght

1984

M

cKni

ght

McK

nigh

t

Kla

mat

h M

ts.

Kla

mat

h K

lam

ath

Kla

mat

h K

lam

ath

Kla

mat

h K

lam

ath

Blu

e M

ts.

Cl.

Cl.

Cl.

Sna

vely

et

Mon

tgom

ery

Cre

ek F

m.

Aal

to

Kla

mat

h A

alto

19

88

Kla

mat

h K

lam

ath

Kla

mat

h A

alto

19

88

Isot

ope

geoc

hem

istry

D

etrit

al m

ica

ages

D

etrit

al z

ircon

age

s

Wild

life S

afar

i fau

lt

Win

ches

ter

Fish

Lad

der

Uni

t A

ge

(Ma)

Cl

ockw

ise

Rota

tion

Sy

n-Co

llisi

on

(mid

-val

ue)

Syn-

Colli

sion

(m

ax.)

W. C

asca

des

post

-40

~ 30

°

Tyee

Fm

. 49

-46

67° ±

14.

5°

Um

pqua

Gp.

54

-49

(inte

rmed

.) ~

12°

~ 39

° Si

letz

R. V

olca

nics

56

-53

79° ±

12.

5°

Wel

ls e

t al.

(200

0, 2

014)

Uni

t A

ge

(Ma)

Cl

ockw

ise

Rota

tion

Sy

n-Co

llisi

on

(mid

-val

ue)

Syn-

Colli

sion

(m

ax.)

W. C

asca

des

post

-40

~ 30

°

Tyee

Fm

. 49

-46

67° ±

14.

5°

Um

pqua

Gp.

54

-49

(inte

rmed

.) ~

12°

~ 39

° Si

letz

R. V

olca

nics

56

-53

79° ±

12.

5°

Wel

ls e

t al.

(200

0, 2

014)

Pale

omag

netic

Dat

a

•!Nor

ther

n K

lam

aths

rota

ted

at

leas

t 67°

± 1

4.5°

, pos

t-53

Ma.

•!U

p to

~ 5

0% o

f tot

al ro

tatio

n m

ay b

e sy

n-co

llisi

onal

. •!R

esto

red

mar

gin

NN

W s

trike

(p

re-C

olum

bia

emba

ymen

t?)

54 –

49

Ma

WSW

EN

E

Pre-

Rot

atio

n W

ells

et a

l. (2

000,

201

4)

Reg

iona

l C

onte

xt

1

References for 2018 Roseburg Field Trip Guide (compiled by B. Dorsey)

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2

Mortimer-Lamb, M., 2016. Provenance of the Eocene Payne Cliffs Formation and tectonic significance, SW Oregon. Senior thesis, University of Oregon, Eugene, Oregon, 42 p.

Renne, P.R., Becker, T.A. and Swapp, S.M., 1990. 40Ar/39Ar laser-probe dating of detrital micas from the Montgomery Creek Formation, northern California: Clues to provenance, tectonics, and weathering processes. Geology, 18(6), pp.563-566.

Ryberg, P. T., 1984. Sedimentation, structure, and tectonics of the Umpqua Group (Paleocene to early Eocene), southwestern Oregon: Tucson, Arizona, University of Arizona doctoral dissertation, 280 p.

Ryu, I.C., 1995. Stratigraphy, sedimentology, and hydrocarbon potential of the lower to middle Eocene forearc and subduction zone strata in the southern Tyee basin, Oregon Coast Range. PhD Thesis, Oregon State University, 417 p.

Ryu, I.C. and Niem, A.R., 1999. Sandstone diagenesis, reservoir potential, and sequence stratigraphy of the Eocene Tyee Basin, Oregon. Journal of Sedimentary Research, 69(2), pp.384-393.

Ryu, I.C., Niem, A.R. and Niem, W.A., 1992. Schematic fence diagram of the southern Tyee basin, Oregon Coast Range, showing stratigraphic relationships of exploration wells to surface measured sections. State of Oregon, Department of Geology and Mineral Industries.

Santra, M., Steel, R.J., Olariu, C. and Sweet, M.L., 2013. Stages of sedimentary prism development on a convergent margin—Eocene Tyee Forearc Basin, Coast Range, Oregon, USA. Global and Planetary Change, 103, pp.207-231.

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