气候变化领域集成服务门户(CCPortal): Arc tempos, tectonic styles, and sedimentation patterns during evolution of the North American Cordillera: Constraints from the retroarc detrital zircon archive

CCPortal

DOI	10.1016/j.earscirev.2021.103557
	Arc tempos, tectonic styles, and sedimentation patterns during evolution of the North American Cordillera: Constraints from the retroarc detrital zircon archive
	Balgord E.A.; Yonkee W.A.; Wells M.L.; Gentry A.; Laskowski A.K.
发表日期	2021
ISSN	00128252
卷号	216
英文摘要	The North American Cordillera orogenic system experienced interrelated cycles of magmatic arc lulls and flare-ups with associated shifts in isotopic signatures, varying extensional to contractional deformation, and changing basin sedimentation patterns during protracted (>100 Myr) subduction and terrane accretion. Here we evaluate the retroarc sedimentary archive of arc magmatism using integrated U-Pb geochronologic and Hf isotopic analysis of arc-derived zircon grains from Triassic to Cretaceous foreland basin strata spanning southern Nevada to Montana. Zircon U-Pb age data record early arc magmatism from ca. 260–210 Ma with a Late Triassic flare-up, a 205–180 Ma lull, a 175–145 Ma Jurassic flare-up, a 140–125 Ma lull, and a 120–85 Ma Cretaceous flare-up, consistent with pluton age patterns in the arc. Triassic age zircon grains have a wide range of εHf values that reflect varying depleted mantle to evolved crustal components during early arc growth. Jurassic-age grains have overall evolved εHf in the southern Nevada and Utah regions, to mostly juvenile values in the Montana region, consistent with a Jurassic arc system built on variably evolved to more juvenile crust going northward. Zircon εHf values show a distinct pulldown from 120–85 Ma, with median εHf decreasing from about +10 to -10, consistent with isotopic shifts in the Sierra Nevada and Idaho plutonic complexes that migrated inboard and interacted with thickened continental crust. A compilation of zircon data from forearc strata shows broadly similar age and isotopic patterns, although the 140–125 Ma lull is better recorded and the Cretaceous flare-up less well recorded compared to the retroarc. The Jurassic and Cretaceous flare-ups and associated shifts in isotopic signatures occurred during episodes of increasing plate convergence rates and terrane accretion, decreasing dip of subducting slabs, intraplate shortening, and enhanced foreland subsidence. Paleo-tectonic reconstructions highlight spatial and temporal interconnections among arc tempo, deformation styles, and sedimentation in forearc and retroarc basins, linked to both subduction dynamics and feedbacks among crustal thickening, migration of arcs into more fertile host crust, formation and removal of eclogitic arc roots, and magmatic flare-ups within the orogenic system. © 2021 Elsevier B.V.
关键词	Arc tempo Cordilleran cycle Detrital zircon Foreland basin Hf isotope U-Pb geochronology
英文关键词	arc-continent collision; deformation; detrital deposit; foreland basin; hafnium; magmatism; sedimentation; tectonic evolution; uranium-lead dating; zircon; North American Cordillera
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203966
作者单位	Department of Earth & Environmental Sciences, Weber State University, Ogden, UT 84408, United States; Department of Geoscience, University of Nevada Las Vegas, Las Vegas, NV 89154, United States; Department of Earth Sciences, Montana State University, Bozeman, MT 59717, United States
推荐引用方式 GB/T 7714	Balgord E.A.,Yonkee W.A.,Wells M.L.,et al. Arc tempos, tectonic styles, and sedimentation patterns during evolution of the North American Cordillera: Constraints from the retroarc detrital zircon archive[J],2021,216.
APA	Balgord E.A.,Yonkee W.A.,Wells M.L.,Gentry A.,&Laskowski A.K..(2021).Arc tempos, tectonic styles, and sedimentation patterns during evolution of the North American Cordillera: Constraints from the retroarc detrital zircon archive.Earth Science Reviews,216.
MLA	Balgord E.A.,et al."Arc tempos, tectonic styles, and sedimentation patterns during evolution of the North American Cordillera: Constraints from the retroarc detrital zircon archive".Earth Science Reviews 216(2021).