Variscan orogeny in Corsica: new structural and geochronological insights, and its place in the Variscan geodynamic framework
Variscan orogeny in Corsica: new structural and geochronological insights, and its place in the Variscan geodynamic framework
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科西嘉岛的瓦里斯造山运动：新的结构和地质年代学见解及其在瓦里斯地球动力学框架中的地位
DOI：
10.1007/s00531-014-1031-8
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发表时间：
2014-05
影响因子：
2.3
通讯作者：
Lin, Wei
中科院分区：
文献类型：
--
作者：
Melleton, Jeremie;Frei, Dirk;Li, Xianhua;Lin, Wei
在西科西嘉，前岩基岩性和变质组合的残余物被保存为千米级的隔膜，封闭在下石炭纪至早二叠世的岩体内。识别出两组隔片：（1）阿利泰拉和阿格里亚特斯-滕达碎片对应于在卡多米亚-泛非造山运动期间变形和变质的新元古代岩石，（2）齐卡沃、波尔图-韦基奥、索伦扎拉-福泰亚、贝尔戈代尔、托皮蒂和维尼奥拉碎片由华力西变质岩石组成。文中给出了各隔的岩性内容和主要韧性变形事件。在Zicavo、波尔图-韦基奥和Topiti septa，一个顶部至西南部的韧性剪切（D1事件）与角闪岩相变质作用同时代，是造成约360 Ma地壳增厚的原因。这一主要事件之前的榴辉岩相和麻粒岩相变质事件保存为残留在混合岩约345-330马。与地壳熔融同时发生的自上而下的韧性剪切（D2事件）为D1事件的折返提供了条件。相比之下，Belgodère部分是特殊的，因为它表现出一个顶部到E的聚散，尽管后退的高压岩石也被认可。前二叠纪碎屑呈四条北西-南东走向的条带排列，确定了一个西南-北东分带：（1）在Topiti、Vignola、Zicavo、波尔图-韦基奥和Solenzara-Fautea的西部区域;（2）在Albertella的新元古代基底及其不整合的早古生代沉积盖层;（3）在Belgodère的东部变质区域;（4）在Agriates-Tenda的另一个新元古代基底及其上古生界沉积盖层。西、东两个区域被S1和S2两条缝合线分开。瓦里斯坎科西嘉代表撒丁岛-科西嘉-毛雷斯部分的东部。这段与其他华力扫描域的比较，使我们能够提出一些可能的相关性。我们认为，西部域，Alcantella，Belgodère，和Agriates-Tenda域可以与南部华力西带暴露在法国地块中南部地块Armoricain，Armorica微块，莱昂块，分别。
In Western Corsica, remnants of pre-batholitic lithological and metamorphic assemblages are preserved as km-scale septa enclosed within Lower Carboniferous to Early Permian plutons. Two groups of septa were recognized: (1) the Argentella and Agriates-Tenda fragments correspond to Neoproterozoic rocks deformed and metamorphosed during the Cadomian–Panafrican orogeny, and (2) the Zicavo, Porto-Vecchio, Solenzara–Fautea, Belgodère, Topiti, and Vignola fragments consist of Variscan metamorphic rocks. The lithological content and the main ductile deformation events for each septum are presented. In the Zicavo, Porto-Vecchio, and Topiti septa, a top-to-the-SW ductile shearing (D1 event) coeval with an amphibolite facies metamorphism is responsible for crustal thickening at ca 360 Ma. This main event was preceded by eclogite and granulite facies metamorphic events preserved as restites within migmatites dated at ca 345–330 Ma. A top-to-the-SE ductile shearing (D2 event) coeval with the crustal melting accommodated the exhumation of the D1 event. In contrast, the Belgodère segment is peculiar as it exhibits a top-to-the-E vergence, although retrogressed high-pressure rocks are also recognized. The pre-Permian fragments are arranged in four NW–SE-striking stripes that define a SW–NE zoning with (1) a Western domain in Topiti, Vignola, Zicavo, Porto-Vecchio, and Solenzara–Fautea; (2) a Neoproterozoic basement with its unconformable Early Paleozoic sedimentary cover in Argentella; (3) an Eastern metamorphic domain in Belgodère; (4) another Neoproterozoic basement with its Upper Paleozoic sedimentary cover in Agriates-Tenda. The Argentella basement is separated from the Western and Eastern domains by two sutures: S1 and S2. The Variscan Corsica represents the Eastern part of the Sardinia–Corsica–Maures segment. The comparison of this segment with other Variscan domains allows us to propose some possible correlations. We argue that the Western domain, Argentella, Belgodère, and Agriates-Tenda domains can be compared with the Southern Variscan belt exposed in French Massif Central–Southern Massif Armoricain, Armorica microblock, Léon block, respectively.
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DOI：
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发表时间：
2012-06
期刊：
--
影响因子：
--
作者：
Anne-Sophie Tabaud
通讯作者：
Anne-Sophie Tabaud
DOI：
--
发表时间：
2001
期刊：
Schweizerische Mineralogische Und Petrographische Mitteilungen
影响因子：
--
作者：
D. Rubatto;U. Schaltegger;B. Lombardo;R. Compagnoni
通讯作者：
D. Rubatto;U. Schaltegger;B. Lombardo;R. Compagnoni
影响因子：
1.4
作者：
M. Faure;J. Lardeaux;P. Ledru
通讯作者：
M. Faure;J. Lardeaux;P. Ledru
DOI：
10.1007/978-3-642-84915-2
发表时间：
1994-02
期刊：
--
影响因子：
--
作者：
J. Keppie
通讯作者：
J. Keppie
影响因子：
--
作者：
F. Arthaud;P. Matte
通讯作者：
F. Arthaud;P. Matte