气候变化领域集成服务门户(CCPortal): First-cycle Sand Supply and the Evolution of the Eastern Canadian Continental margin: Insights from Pb isotopes in the Mesozoic Scotian Basin

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DOI	10.1130/B35419.1
	First-cycle Sand Supply and the Evolution of the Eastern Canadian Continental margin: Insights from Pb isotopes in the Mesozoic Scotian Basin
	Blowick A.; Pe-Piper G.; Piper D.J.W.; Zhang Y.; Tyrrell S.
发表日期	2021
ISSN	167606
起始页码	1301
结束页码	1319
卷号	133
英文摘要	Provenance analysis provides a powerful means to understand, connect, and reconstruct source-to-sink systems and Earth surface processes, if reliable toolkits can be developed, refined, and applied. Deciphering sediment routing to the Scotian Basin, offshore eastern Canada, is marred by sedimentary recycling but is critical to understanding the evolution of the Canadian margin in response to the evolving Labrador rift. In this study, Pb isotopes in detrital K-feldspars were fingerprinted in 13 wells across the Scotian Basin to track first-cycle sand supply. Unlike previous approaches, which utilized less labile proxies such as zircon, detrital K-feldspars are unlikely to survive multiple sedimentary cycles. The Pb-isotopic data reveal a dynamic seesaw effect between hinterland sources across the Jurassic-Cretaceous boundary, reflecting the complex interplay between the northward propagation of uplift along the rising Labrador rift flank and the reactivation of fault systems in the lower drainage basin. Pb isotopes in K-feldspar record progressively increasing long-distance supply from eastern Labrador, as early as the Callovian in the central basin, alongside diminishing but persistent local sourcing from adjacent Appalachian terranes. Comparison with more resilient mineral proxies, notably zircon, appears to confirm recycling in the lower drainage basin and highlights the limitations of using a single mineral proxy in isolation. This case study serves as an example of the growing potential of multiproxy provenance toolkits not only to decipher sediment-routing corridors in paleodrainage systems, but to better define and connect the drivers, mechanisms, and spatial and temporal ranges of Earth surface processes and tectonic events. © 2020 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184668
作者单位	Sediment Origins Research Team (SORT), Earth and Ocean Sciences and Irish Centre for Research in Applied Geosciences (iCRAG), National University of Ireland, Galway, Ireland; Department of Geology, Saint Mary’s University, Nova Scotia, Halifax, B3H 3C3, Canada; Natural Resources Canada, Geological Survey of Canada (Atlantic), Bedford Institute of Oceanography, P.O. Box 1006, Nova Scotia, Dartmouth, B2Y 4A2, Canada; School of Earth and Space Sciences, Peking University, Beijing, 100871, China
推荐引用方式 GB/T 7714	Blowick A.,Pe-Piper G.,Piper D.J.W.,et al. First-cycle Sand Supply and the Evolution of the Eastern Canadian Continental margin: Insights from Pb isotopes in the Mesozoic Scotian Basin[J],2021,133.
APA	Blowick A.,Pe-Piper G.,Piper D.J.W.,Zhang Y.,&Tyrrell S..(2021).First-cycle Sand Supply and the Evolution of the Eastern Canadian Continental margin: Insights from Pb isotopes in the Mesozoic Scotian Basin.Bulletin of the Geological Society of America,133.
MLA	Blowick A.,et al."First-cycle Sand Supply and the Evolution of the Eastern Canadian Continental margin: Insights from Pb isotopes in the Mesozoic Scotian Basin".Bulletin of the Geological Society of America 133(2021).