DOI: 10.1016/j.epsl.2018.05.023
Scopus记录号: 2-s2.0-85047251885
论文题名: Formation of large-scale impact melt dikes: A case study of the Foy Offset Dike at the Sudbury impact structure, Canada
作者: Pilles E.A. ; Osinski G.R. ; Grieve R.A.F. ; Smith D. ; Bailey J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 495 起始页码: 224
结束页码: 233
语种: 英语
英文关键词: dike emplacement
; flow differentiation
; impact crater
; impact melt
; Offset Dike
; Sudbury
Scopus关键词: Copper deposits
; Copper mines
; Levees
; Structural geology
; Sulfur compounds
; Alternative hypothesis
; Dike emplacements
; Hypervelocity impacts
; Impact craters
; Impact melt
; Impact structures
; Large-scale impacts
; Sudbury
; Hydraulic structures
; clast
; crater
; dike
; emplacement
; melt
; petrography
; sulfide
; Canada
; Ontario [Canada]
; Sudbury Structure
英文摘要: Hypervelocity impacts frequently result in the formation of dikes in the crater floor and central uplift. Impact melt-bearing dikes in large terrestrial impact basins – such as the Offset Dikes at the Sudbury impact structure – occur at a large scale, often tens of meters wide and several kilometers in length. The Offset Dikes host significant Ni–Cu–PGE deposits, which include several well-known mines, such as Totten and Copper Cliff that have been mined for nearly 100 years. The Offset Dikes typically consist of a clast- and sulfide-rich core and clast-poor margins. Their formation has been a subject of debate for decades. The most widely proposed model is the early emplacement of clast-poor impact melt shortly after the impact event, followed by the later emplacement of clast- and sulfide-rich impact melt in the center of the dike. An alternative hypothesis is that a single pulse of clast-rich impact melt flowed into the fractured target rocks and flow differentiation resulted in a clast-rich core and a clast-poor margin. In this study, we examine field and petrographic relationships of the Foy Offset Dike to better understand its emplacement. Our results show that the characteristics of the Foy Offset Dike – namely the gradational nature of the contact between the clast-rich and clast-poor phases, the alignment of clasts sub-parallel to this contact, the geochemical similarities and the presence of sulfides within both phases of the dike – are more consistent with the single injection and flow differentiation hypothesis. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109822
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Earth Sciences, Centre for Planetary Science and Exploration, University of Western Ontario, London, Ontario N6A 5B7, Canada; Department of Physics and Astronomy, University of Western Ontario, London, Ontario N6A 5B7, Canada; Wallbridge Mining Company Limited, 129 Fielding Road, Sudbury, ON P3Y 1L7, Canada
Recommended Citation:
Pilles E.A.,Osinski G.R.,Grieve R.A.F.,et al. Formation of large-scale impact melt dikes: A case study of the Foy Offset Dike at the Sudbury impact structure, Canada[J]. Earth and Planetary Science Letters,2018-01-01,495