干旱区生态环境知识资源中心(Arid): Exhumation Timing in the Oregon Cascade Range Decoupled From Deformation, Magmatic, and Climate Patterns

Arid

DOI	10.1029/2020TC006078
	Exhumation Timing in the Oregon Cascade Range Decoupled From Deformation, Magmatic, and Climate Patterns
	Pesek, Maria E.; Perez, Nicholas D.; Meigs, Andrew; Rowden, C. Charles; Giles, Sarah M.
通讯作者	Perez, ND
来源期刊	TECTONICS
ISSN	0278-7407
EISSN	1944-9194
出版年	2020
卷号	39 期号:9
英文摘要	The Cascade Range in the Pacific Northwest, USA, developed as an Eocene to recent volcanic arc along the Pacific/North American ocean-continent subduction zone. The volcanic arc is characterized by temporally and spatially variable magmatism. Crustal deformation that accompanied development of the arc transitions from N-S transpression in the Yakima Fold Belt and Puget lowland (western Washington, northern Oregon) to generally E-W transtension in the south (central and southern Oregon). Orography focuses precipitation along the western flank of the Cascade Range, whereas the eastern flank is relatively arid. We use the unique spatial variation in deformation, magmatic history, and orographic precipitation to investigate the contributions from tectonic and surface processes to rock uplift. We reconstruct the exhumation pathway of plutonic rocks throughout the Cascade Range by exploiting the unique juxtaposition of basalt-capped ridges above valleys exposing exhumed Cenozoic plutons. Multiple bedrock geochronometers and thermochronometers constrain the thermal history in six catchments along the Cascade arc from southern Oregon to southern Washington. U-Pb geochronology defines circa 10-24 Ma pluton crystallization ages. Apatite and zircon (U-Th)/He thermochronology ages range from circa 8-23 Ma.Ar-40/Ar-39 geochronology defines circa 5-8 Ma basalt emplacement. Our results reveal spatially and temporally variable shallow exhumation in the southern Washington and Oregon Cascades and that the timing of exhumation is earlier than circa 6-12 Ma exhumation previously reported in the Washington Cascades. Spatially and temporally variable exhumation highlights that crustal deformation plays a significant role in rock uplift in addition to erosional mass removal in concert with orographic precipitation.
英文关键词	Cascades thermochronology exhumation climate tectonics orogenic rock uplift
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000576412900010
WOS关键词	OXYGEN-ISOTOPE EVIDENCE ; APATITE (U-TH-SM)/HE THERMOCHRONOLOGY ; PARTICLE STOPPING DISTANCES ; RADIATION-DAMAGE ; (U-TH)/HE THERMOCHRONOMETRY ; HELIUM DIFFUSION ; TH ZONATION ; WASHINGTON-STATE ; EVEREST REGION ; YAKIMA FOLD
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326689
作者单位	[Pesek, Maria E.; Perez, Nicholas D.; Rowden, C. Charles; Giles, Sarah M.] Texas A&M Univ, Dept Geol & Geophys, College Stn, TX 77843 USA; [Meigs, Andrew] Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA; [Giles, Sarah M.] Columbia Univ, Dept Earth & Environm Sci, Palisades, NY USA; [Giles, Sarah M.] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY USA
推荐引用方式 GB/T 7714	Pesek, Maria E.,Perez, Nicholas D.,Meigs, Andrew,et al. Exhumation Timing in the Oregon Cascade Range Decoupled From Deformation, Magmatic, and Climate Patterns[J],2020,39(9).
APA	Pesek, Maria E.,Perez, Nicholas D.,Meigs, Andrew,Rowden, C. Charles,&Giles, Sarah M..(2020).Exhumation Timing in the Oregon Cascade Range Decoupled From Deformation, Magmatic, and Climate Patterns.TECTONICS,39(9).
MLA	Pesek, Maria E.,et al."Exhumation Timing in the Oregon Cascade Range Decoupled From Deformation, Magmatic, and Climate Patterns".TECTONICS 39.9(2020).