| DOI: | 10.1016/j.gloplacha.2014.08.017
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| 论文题名: | Composition and evolution of the Ancestral South Sandwich Arc: Implications for the flow of deep ocean water and mantle through the Drake Passage Gateway |
| 作者: | Pearce J.A.; Hastie A.R.; Leat P.T.; Dalziel I.W.; Lawver L.A.; Barker P.F.; Millar I.L.; Barry T.L.; Bevins R.E.
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| ISSN: | 0921-8414
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| 出版年: | 2014
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| 卷: | 123 | | 起始页码: | 298
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| 结束页码: | 322
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| 语种: | 英语
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| 英文关键词: | Arc volcanism
; Drake Passage Gateway
; Isotope geochemistry
; Scotia Sea
; Trace element geochemistry
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| Scopus关键词: | Exploratory geochemistry
; Flow of water
; Geochemistry
; Isotopes
; Lead
; Neodymium
; Ocean currents
; Structural geology
; Tectonics
; Trace elements
; Arc volcanism
; Drake passage
; Isotope geochemistry
; Scotia Sea
; Trace element geochemistry
; Strontium
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| 英文摘要: | The Ancestral South Sandwich Arc (ASSA) has a short life-span of c. 20. m.y. (early Oligocene to middle-late Miocene) before slab retreat and subsequent 'resurrection' as the active South Sandwich Island Arc (SSIA). The ASSA is, however, significant because it straddled the eastern margin of the Drake Passage Gateway where it formed a potential barrier to deep ocean water and mantle flow from the Pacific to Atlantic. The ASSA may be divided into three parts, from north to south: the Central Scotia Sea (CSS), the Discovery segment, and the Jane segment. Published age data coupled with new geochemical data (major elements, trace elements, Hf-Nd-Sr-Pb isotopes) from the three ASSA segments place constraints on models for the evolution of the arc and hence gateway development. The CSS segment has two known periods of activity. The older, Oligocene, period produced basic-acidic, mostly calc-alkaline rocks, best explained in terms of subduction initiation volcanism of Andean-type (no slab rollback). The younger, middle-late Miocene period produced basic-acidic, high-K calc-alkaline rocks (lavas and pyroclastic rocks with abundant volcanigenic sediments) which, despite being erupted on oceanic crust, have continental arc characteristics best explained in terms of a large, hot subduction flux most typical of a syn- or post-collision arc setting. Early-middle Miocene volcanism in the Discovery and Jane arc segments is geochemically quite different, being typically tholeiitic and compositionally similar to many lavas from the active South Sandwich Island Arc front. There is indirect evidence for Western Pacific-type (slab rollback) subduction initiation in the southern part of the ASSA and for the back-arc basins (the Jane and Scan Basins) to have been active at the time of arc volcanism. Models for the death of the ASSA in the south following a series of ridge-trench collisions are not positively supported by any geochemical evidence of hot subduction, but cessation of subduction by approach of progressively more buoyant oceanic lithosphere is consistent with both geochemistry and geodynamics. In terms of deep ocean water flow the early stages of spreading at the East Scotia Ridge (starting at 17-15. Ma) may have been important in breaking up the ASSA barrier while the subsequent establishment of a STEP (Subduction-Transform Edge Propagator) fault east of the South Georgia microcontinent (<. 11. Ma) led to formation of the South Georgia Passage used by the Antarctic Circumpolar Current today. In terms of mantle flow, the subduction zone and arc root likely acted as a barrier to mantle flow in the CSS arc segment such that the ASSA itself became the Pacific-South Atlantic mantle domain boundary. This was not the case in the Discovery and Jane arc segments, however, because the northward flow of the South Atlantic mantle behind the southern part of the ASSA gave an Atlantic provenance to the whole southern ASSA. © 2014. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955192456&doi=10.1016%2fj.gloplacha.2014.08.017&partnerID=40&md5=3f5e7d3a8a23f3a6569ec58194f0fc93
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/11320
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| Appears in Collections: | 全球变化的国际研究计划
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作者单位: | School of Earth and Ocean Sciences, Cardiff University, Main Building, Park Place, Cardiff, United Kingdom
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| Recommended Citation: | |
Pearce J.A.,Hastie A.R.,Leat P.T.,et al. Composition and evolution of the Ancestral South Sandwich Arc: Implications for the flow of deep ocean water and mantle through the Drake Passage Gateway[J],2014-01-01,123.
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