期刊
LITHOS
卷 124, 期 3-4, 页码 255-272出版社
ELSEVIER
DOI: 10.1016/j.lithos.2011.01.002
关键词
Zircon U-Pb SHRIMP dating; Eclogitized ophiolites; Pangaea break-up; Western Tethys; Betic Cordillera; Spain
资金
- Spanish Ministry of Science and Innovation [BTE-2003-09808, CGL2009-12369]
- FEDER
- Research Group RNM 333 of Junta de Andalucia (Spain)
The Betic Ophiolitic Unit part of the Mulhacen Complex in the Betic Cordillera (SE Spain), is composed of several tectonic slices of eclogitized mafic and ultramafic rocks, together with oceanic metasediments. A comprehensive review of the petrological characteristics of the Betic Ophiolites shows notable analogies with other ophiolites from the Alps-Apennines system, indicating that they represent relics of oceanic lithosphere created at the westernmost end of the Western Tethys. U-Pb dating by SHRIMP (Sensitive High Resolution Ion MicroProbe) on zircon grains carefully investigated by cathodoluminescence images has been carried out on an eclogitized metagabbro (Lugros outcrop) and a metadolerite dyke intruded in ultramafic rocks (Almirez outcrop), giving consistent magmatic ages of around 185 +/- 3 Ma. This age marks the beginning of the Betic oceanic magmatism (transitional to enriched MORB) that followed Pangaea break-up and the earliest oceanic accretion of the Western Tethys Ocean. Subsequently, ultraslow mid-ocean ridge spreading developed from the Betic oceanic basin northeastward to the Ligurian and Alpine Tethys domains, mainly around 165 to 140 Ma. (C) 2011 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据