Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B35017.1 |
Early Ordovician to Early Devonian tectonic development of the northern margin of Laurentia, Canadian Arctic Islands | |
Dewing, Keith1; Hadlari, Thomas1; Pearson, D. Graham2; Matthews, William3 | |
2019-07-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2019 |
卷号 | 131页码:1075-1094 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | Three tectonic events affected the northern margin of Laurentia between Early Ordovician and Early Devonian time. Each tectonic cycle started with an unconformity followed by rapid subsidence and an influx of clastic material, then decreasing sediment accumulation rates. The first cycle extends from the Tremadoc to late Katian (480-448 Ma), the second from late Katian to Ludlow (448426 Ma), and the third from Ludlow to Lochkovian (426-410 Ma). A strong geodynamic link is interpreted between the first two sedimentary cycles and tectonic events on the composite Pearya terrane on northern Ellesmere Island, Nunavut, Canada. The first cycle is interpreted as a response to crustal thickening caused by the M'Clintock Orogeny on Pearya terrane and onset of subduction dipping under Laurentia. An extensive Middle Ordovician (Darriwillian) unconformity is not associated with a change in subsidence rate or a change of facies above and below, but is normally faulted. It is interpreted as a migrating forebulge or increase in crustal buoyancy due to breakoff of a subduction slab. The second cycle is synchronous with a Late Ordovician minor faulting event on Pearya terrane and volcanic units in the deep water basin between Pearya terrane and the carbonate platform. A major platform margin stepback, along with a positive epsilon Nd shift are associated with the late Katian Irene Bay Formation. The event also introduced numerous organisms of Siberian affinity into northern Laurentia. The third cycle, starting in Ludlow time is related to the onset of deformation in the Boothia foldbelt and is not recorded as a deformational event on Pearya terrane. The presence of aerially restricted intra-platform basins that are interpreted to be synchronous with, and caused by, tectonic events on Pearya terrane implies that it was close to its current location by Early Ordovician time. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000471802800002 |
WOS关键词 | CORNWALLIS FOLD BELT ; PEARYA TERRANE ; CARBONATE PLATFORM ; ELLESMERE-ISLAND ; BAFFIN-ISLAND ; EVOLUTION ; GEOCHRONOLOGY ; CONSTRAINTS ; INSIGHTS ; RECORD |
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/184592 |
专题 | 地球科学 |
作者单位 | 1.Geol Survey Canada, 3303-33rd St NW, Calgary, AB T2L 2A7, Canada; 2.Univ Alberta, Earth & Atmospher Sci, Edmonton, AB T6G 2E3, Canada; 3.Univ Calgary, Dept Geosci, 2500 Univ Dr NW, Calgary, AB T2N 1N4, Canada |
推荐引用方式 GB/T 7714 | Dewing, Keith,Hadlari, Thomas,Pearson, D. Graham,et al. Early Ordovician to Early Devonian tectonic development of the northern margin of Laurentia, Canadian Arctic Islands[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2019,131:1075-1094. |
APA | Dewing, Keith,Hadlari, Thomas,Pearson, D. Graham,&Matthews, William.(2019).Early Ordovician to Early Devonian tectonic development of the northern margin of Laurentia, Canadian Arctic Islands.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,131,1075-1094. |
MLA | Dewing, Keith,et al."Early Ordovician to Early Devonian tectonic development of the northern margin of Laurentia, Canadian Arctic Islands".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 131(2019):1075-1094. |
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