FROM MAGMATIC TO METAMORPHIC DEFORMATIONS IN A JURASSIC OPHIOLITIC COMPLEX: THE BRACCO GABBROIC MASSIF, EASTERN LIGURIA (ITALY)

IF 1.2 4区 地球科学 Q2 GEOLOGY
F. Menna
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引用次数: 13

Abstract

A new structural study with multiscale detailed analysis of the main elements of the fabric was performed on the Bracco ophiolitic massif (Eastern Liguria). The results are here presented with a reconstruction of the sequence of events which characterized the evolution of the gabbroic complex, starting form the first magmatic phases up to the late metamorphic ones, through a retrograde path which ended with the final exposure of the gabbro on the ocean floor. The field observations, supported by petrographic analyses, lead to outline for the Bracco Gabbroic Complex a deformative evolution which started in the early magmatic phases; the study of the metamorphic structures, following the intrusion and the syn-magmatic deformation of the gabbroic complex, allowed to identify three distinct metamorphic phases, whose petrographic features show that the associated deformations could actually represent a continuous evolution of the same tectonic phenomenon, which started under granulitic facies conditions, continued in amphibolitic facies and ended with deformations and recrystallizations in greenschist facies conditions.
侏罗纪蛇绿杂岩的岩浆变形到变质变形:意大利东利古里亚布拉科辉长岩地块
对东利古里亚布拉科蛇绿岩地块进行了一项新的结构研究,对其主要成分进行了多尺度详细分析。本文的结果是对辉长岩复合体演化的一系列事件的重建,这些事件从第一个岩浆阶段开始,一直到晚变质阶段,经过一条以辉长岩在海底的最终暴露为结束的逆行路径。野外观测和岩石学分析表明,布拉科辉长岩杂岩的变形演化始于早期岩浆期;通过对变质构造的研究,根据辉长岩杂岩的侵入和同岩浆变形,确定了三个不同的变质阶段,其岩石学特征表明,相关的变形实际上代表了同一构造现象的连续演化,从粒状相条件下开始,到角闪岩相条件下继续,到绿片岩相条件下以变形和再结晶结束。
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来源期刊
Ofioliti
Ofioliti 地学-地质学
CiteScore
2.40
自引率
7.70%
发文量
1
期刊介绍: Since 1976, Ofioliti provides an international forum for original contributions and reviews in the field of the geodynamics, petrology, geochemistry, biostratigraphy, stratigraphy, tectonics and paleogeography applied to ophiolitic terrains and modern oceanic lithosphere, including their sedimentary cover. Studies of topics such as geodynamics of the mantle, the evolution of orogens including ophiolites and paleoceanography are also welcome
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