Late Miocene exhumation and uplift of the Washington Cascade Range

Peter W Reiners, Todd A. Ehlers, John I. Garver, Sara Gran Mitchell, David R. Montgomery, Joseph A. Vance, Stefan Nicolescu

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

The Washington Cascade Range is a complex, polygenetic mountain range that dominates the topographic, climatic, and cultural configurations of Washington State. Although it has been the locus of ongoing are magmatism since the Eocene, most of the range is distinct from the southern part of the arc in Oregon and California in that bedrock uplift has produced high surface elevations and topographic relief, rather than volcanic burial or edifice construction. (U-Th)/He and fission-track ages of bedrock samples on the east flank of the range record relatively rapid cooling in the early Tertiary, but slow exhumation rates (∼0.2 km/m.y.) through most of the Oligocene. Samples on the west flank suggest rapid cooling in the late Miocene (8-12 Ma), and age variations in vertical transects are consistent with a pulse of rapid exhumation (0.5-1.0 km/m.y.) at that time. Apatite He ages as young as 1-5 Ma in several areas suggest that high cooling and possibly exhumation rates persist locally. Accelerated exhumation rates ca. 10 Ma are also observed in the Coast Mountains of British Columbia and southeast Alaska, ∼1500 km to the north, suggesting a large-scale mechanism for the exhumation pulse at that time.

Original languageEnglish (US)
Pages (from-to)767-770
Number of pages4
JournalGeology
Volume30
Issue number9
DOIs
StatePublished - Sep 2002
Externally publishedYes

Fingerprint

exhumation
uplift
Miocene
cooling
bedrock
apatite
Oligocene
magmatism
Eocene
relief
transect
mountain
coast
rate

Keywords

  • (U-Th)/He
  • Apatite
  • Cascades
  • Thermochronology
  • Washington

ASJC Scopus subject areas

  • Geology

Cite this

Reiners, P. W., Ehlers, T. A., Garver, J. I., Mitchell, S. G., Montgomery, D. R., Vance, J. A., & Nicolescu, S. (2002). Late Miocene exhumation and uplift of the Washington Cascade Range. Geology, 30(9), 767-770. https://doi.org/10.1130/0091-7613(2002)030<0767:LMEAUO>2.0.CO;2

Late Miocene exhumation and uplift of the Washington Cascade Range. / Reiners, Peter W; Ehlers, Todd A.; Garver, John I.; Mitchell, Sara Gran; Montgomery, David R.; Vance, Joseph A.; Nicolescu, Stefan.

In: Geology, Vol. 30, No. 9, 09.2002, p. 767-770.

Research output: Contribution to journalArticle

Reiners, PW, Ehlers, TA, Garver, JI, Mitchell, SG, Montgomery, DR, Vance, JA & Nicolescu, S 2002, 'Late Miocene exhumation and uplift of the Washington Cascade Range', Geology, vol. 30, no. 9, pp. 767-770. https://doi.org/10.1130/0091-7613(2002)030<0767:LMEAUO>2.0.CO;2
Reiners, Peter W ; Ehlers, Todd A. ; Garver, John I. ; Mitchell, Sara Gran ; Montgomery, David R. ; Vance, Joseph A. ; Nicolescu, Stefan. / Late Miocene exhumation and uplift of the Washington Cascade Range. In: Geology. 2002 ; Vol. 30, No. 9. pp. 767-770.
@article{a85a3f074d824d9681bb452e6521de62,
title = "Late Miocene exhumation and uplift of the Washington Cascade Range",
abstract = "The Washington Cascade Range is a complex, polygenetic mountain range that dominates the topographic, climatic, and cultural configurations of Washington State. Although it has been the locus of ongoing are magmatism since the Eocene, most of the range is distinct from the southern part of the arc in Oregon and California in that bedrock uplift has produced high surface elevations and topographic relief, rather than volcanic burial or edifice construction. (U-Th)/He and fission-track ages of bedrock samples on the east flank of the range record relatively rapid cooling in the early Tertiary, but slow exhumation rates (∼0.2 km/m.y.) through most of the Oligocene. Samples on the west flank suggest rapid cooling in the late Miocene (8-12 Ma), and age variations in vertical transects are consistent with a pulse of rapid exhumation (0.5-1.0 km/m.y.) at that time. Apatite He ages as young as 1-5 Ma in several areas suggest that high cooling and possibly exhumation rates persist locally. Accelerated exhumation rates ca. 10 Ma are also observed in the Coast Mountains of British Columbia and southeast Alaska, ∼1500 km to the north, suggesting a large-scale mechanism for the exhumation pulse at that time.",
keywords = "(U-Th)/He, Apatite, Cascades, Thermochronology, Washington",
author = "Reiners, {Peter W} and Ehlers, {Todd A.} and Garver, {John I.} and Mitchell, {Sara Gran} and Montgomery, {David R.} and Vance, {Joseph A.} and Stefan Nicolescu",
year = "2002",
month = "9",
doi = "10.1130/0091-7613(2002)030<0767:LMEAUO>2.0.CO;2",
language = "English (US)",
volume = "30",
pages = "767--770",
journal = "Geology",
issn = "0091-7613",
publisher = "Geological Society of America",
number = "9",

}

TY - JOUR

T1 - Late Miocene exhumation and uplift of the Washington Cascade Range

AU - Reiners, Peter W

AU - Ehlers, Todd A.

AU - Garver, John I.

AU - Mitchell, Sara Gran

AU - Montgomery, David R.

AU - Vance, Joseph A.

AU - Nicolescu, Stefan

PY - 2002/9

Y1 - 2002/9

N2 - The Washington Cascade Range is a complex, polygenetic mountain range that dominates the topographic, climatic, and cultural configurations of Washington State. Although it has been the locus of ongoing are magmatism since the Eocene, most of the range is distinct from the southern part of the arc in Oregon and California in that bedrock uplift has produced high surface elevations and topographic relief, rather than volcanic burial or edifice construction. (U-Th)/He and fission-track ages of bedrock samples on the east flank of the range record relatively rapid cooling in the early Tertiary, but slow exhumation rates (∼0.2 km/m.y.) through most of the Oligocene. Samples on the west flank suggest rapid cooling in the late Miocene (8-12 Ma), and age variations in vertical transects are consistent with a pulse of rapid exhumation (0.5-1.0 km/m.y.) at that time. Apatite He ages as young as 1-5 Ma in several areas suggest that high cooling and possibly exhumation rates persist locally. Accelerated exhumation rates ca. 10 Ma are also observed in the Coast Mountains of British Columbia and southeast Alaska, ∼1500 km to the north, suggesting a large-scale mechanism for the exhumation pulse at that time.

AB - The Washington Cascade Range is a complex, polygenetic mountain range that dominates the topographic, climatic, and cultural configurations of Washington State. Although it has been the locus of ongoing are magmatism since the Eocene, most of the range is distinct from the southern part of the arc in Oregon and California in that bedrock uplift has produced high surface elevations and topographic relief, rather than volcanic burial or edifice construction. (U-Th)/He and fission-track ages of bedrock samples on the east flank of the range record relatively rapid cooling in the early Tertiary, but slow exhumation rates (∼0.2 km/m.y.) through most of the Oligocene. Samples on the west flank suggest rapid cooling in the late Miocene (8-12 Ma), and age variations in vertical transects are consistent with a pulse of rapid exhumation (0.5-1.0 km/m.y.) at that time. Apatite He ages as young as 1-5 Ma in several areas suggest that high cooling and possibly exhumation rates persist locally. Accelerated exhumation rates ca. 10 Ma are also observed in the Coast Mountains of British Columbia and southeast Alaska, ∼1500 km to the north, suggesting a large-scale mechanism for the exhumation pulse at that time.

KW - (U-Th)/He

KW - Apatite

KW - Cascades

KW - Thermochronology

KW - Washington

UR - http://www.scopus.com/inward/record.url?scp=0346525126&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0346525126&partnerID=8YFLogxK

U2 - 10.1130/0091-7613(2002)030<0767:LMEAUO>2.0.CO;2

DO - 10.1130/0091-7613(2002)030<0767:LMEAUO>2.0.CO;2

M3 - Article

AN - SCOPUS:0346525126

VL - 30

SP - 767

EP - 770

JO - Geology

JF - Geology

SN - 0091-7613

IS - 9

ER -