| DOI: | 10.1016/j.gloplacha.2014.07.022
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| 论文题名: | Insights about the structure and evolution of the Scotia Arc from a new magnetic data compilation |
| 作者: | Martos Y.M.; Catalán M.; Galindo-Zaldívar J.; Maldonado A.; Bohoyo F.
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| ISSN: | 0921-8390
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| 出版年: | 2014
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| 卷: | 123 | | 起始页码: | 239
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| 结束页码: | 248
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| 语种: | 英语
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| 英文关键词: | Analytic signal map
; Antarctica
; Magnetic anomalies
; Magnetic models
; Pacific Margin Anomaly
; Tectonic reconstruction
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| Scopus关键词: | Igneous rocks
; Analytic signals
; Antarctica
; Magnetic anomalies
; Magnetic models
; Pacific Margin Anomaly
; Magnetism
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| 英文摘要: | Analysis of a new regional compilation of magnetic anomalies from marine, aeromagnetic and satellite data reveals the main structural/tectonic elements of the Scotia Arc. The most relevant magnetic anomaly in the continental crust, the Pacific Margin Anomaly (PMA), is related to composite magmatic arc batholiths. It was emplaced by subduction processes along the Pacific continental margin of the Antarctic Peninsula and can be followed within the continental blocks of the South Scotia Ridge and South America. Four representative magnetic profiles also show the structure in depth, and allow us to characterize the main crustal elements of the region. The new compilation and models improve our knowledge of the Scotia Arc's development. The PMA is seen to have a roughly W-E orientation, decreasing in intensity eastwards from the Pacific Margin of the Antarctic Peninsula, and extending towards the South Scotia Ridge to Discovery Bank and even to Herdman Bank. However, the identification of the PMA in the North Scotia Ridge is uncertain, since the magnetic anomalies and the modeled profiles do not support the presence of an important batholithic body. This setting can be attributed to the kinematics of subduction, almost orthogonal to the Pacific margin of the Antarctic Peninsula and oblique along the South American margin. Based on the new magnetic anomaly map, magnetic modeling, and the continuity of the PMA along the Antarctic Peninsula and South Scotia Ridge, we propose a reconstruction of the initial distribution of the main continental blocks in the initial stages during the Cretaceous. The anomalies identified in the northern Scotia Sea are probably related to local basic and/or intermediate igneous rocks intruded in pull-apart basins that developed in the South America-Antarctica plate boundary deformation zone during the initial stages of South Atlantic Ocean and Weddell Sea spreading. © 2014 Elsevier B.V. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955209011&doi=10.1016%2fj.gloplacha.2014.07.022&partnerID=40&md5=3ae94c73955e9e2f5b5a46c5aa7fd06a
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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/11296
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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: | Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones Cientificas/Universidad de Granada), Avda. de Las Palmeras n 4, Armilla, Granada, Spain
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| Recommended Citation: | |
Martos Y.M.,Catalán M.,Galindo-Zaldívar J.,et al. Insights about the structure and evolution of the Scotia Arc from a new magnetic data compilation[J],2014-01-01,123.
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