Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B32039.1 |
Upper Windermere Supergroup and the transition from rifting to continent-margin sedimentation, Nadaleen River area, northern Canadian Cordillera | |
Moynihan, David P.1; Strauss, Justin, V2; Nelson, Lyle L.3; Padget, Colin D.4 | |
2019-09-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2019 |
卷号 | 131页码:1673-1701 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; USA |
英文摘要 | Neoproterozoic-Cambrian rocks of the Windermere Supergroup and overlying units record the breakup of Rodinia and formation of the northwestern Laurentian ancestral continental margin. Understanding the nature and timing of this transition has been hampered by difficulty correlating poorly dated sedimentary successions from contrasting depositional settings across Mesozoic structures. Here we present new lithoand chemo-stratigraphic data from a Cryogenian-lower Cambrian succession in east-central Yukon (Canada), establish correlations between proximal and distal parts of the upper Windermere Supergroup and related strata in the northern Canadian Cordillera, and consider implications for the formation of the northwestern Laurentian margin. The newly defined Nadaleen Formation hosts the first appearance of Ediacaran macrofossils, while the overlying Gametrail Formation features a large negative carbon isotope anomaly with delta C-13(carb) values as low as -13 parts per thousand that correlates with the globally developed Shuram-Wonoka anomaly. We also define the Rackla Group, which includes the youngest (Ediacaran) portions of the Windermere Supergroup in the northern Cordillera. The top of the Windermere Supergroup is marked by an unconformity above the Risky Formation that passes into a correlative conformity in the Nadaleen River area. This surface has been interpreted to mark the top of the rift-related succession, but we draw attention to evidence for tectonic instability through the early-middle Cambrian and argue that the transition from rifting to postrift thermal subsidence is marked by a wide- spread unconformity that underlies upper Cambrian carbonate rocks. This is younger than the interpreted age of the rift to post-rift transition elsewhere along the ancestral western Laurentian continental margin. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000483604100014 |
WOS关键词 | CARBON-ISOTOPE EXCURSION ; MACKENZIE MOUNTAINS ; NORTHWESTERN CANADA ; EDIACARAN FOSSILS ; TRACE FOSSILS ; MAGMA-POOR ; DEFORMATION STRUCTURES ; PROTEROZOIC EVOLUTION ; TECTONIC SUBSIDENCE ; WERNECKE MOUNTAINS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/186687 |
专题 | 地球科学 |
作者单位 | 1.Yukon Geol Survey, POB 2703, Whitehorse, YT Y1A 2C6, Canada; 2.Dartmouth Coll, Dept Earth Sci, HB6105 Fairchild Hall, Hanover, NH 03755 USA; 3.Johns Hopkins Univ, Dept Earth & Planetary Sci, 3400 N Charles St,Olin Hall, Baltimore, MD 21218 USA; 4.Univ Calgary, Dept Geosci, 2500 Univ Dr NW, Calgary, AB T2N 1N4, Canada |
推荐引用方式 GB/T 7714 | Moynihan, David P.,Strauss, Justin, V,Nelson, Lyle L.,et al. Upper Windermere Supergroup and the transition from rifting to continent-margin sedimentation, Nadaleen River area, northern Canadian Cordillera[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2019,131:1673-1701. |
APA | Moynihan, David P.,Strauss, Justin, V,Nelson, Lyle L.,&Padget, Colin D..(2019).Upper Windermere Supergroup and the transition from rifting to continent-margin sedimentation, Nadaleen River area, northern Canadian Cordillera.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,131,1673-1701. |
MLA | Moynihan, David P.,et al."Upper Windermere Supergroup and the transition from rifting to continent-margin sedimentation, Nadaleen River area, northern Canadian Cordillera".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 131(2019):1673-1701. |
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