意大利西阿尔卑斯山脉布雷伊尔山谷保存的瓦莱桑海陆过渡时期的枕状变质玄武岩和变质角砾岩

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-07-31 DOI:10.4454/OFIOLITI.V46I2.546

G. Frasca, R. Compagnoni

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引用次数: 1

摘要

俯冲板块边缘在俯冲前环境中的保存潜力本质上很差，因为大多数岩石下沉并消失在地幔中。然而，据报道，在意大利西阿尔卑斯山的Lower Penninic单元（瓦莱桑盆地）中，存在一个保存的俯冲前环境（Beltrando等人，2012年）。在这里，我们回顾了意大利瓦莱桑盆地的两个主要方面：同裂谷碎屑沉积物的性质和靠近大陆地壳变质花岗岩类的变质玄武岩的特征。据报道，新的化石发现证实了瓦莱桑裂谷作用的中生代。来自富含化石的高压变质沉积物附近的变质碎屑岩和枕状变质玄武岩的野外和岩石学数据支持将Breuil山谷（Aosta）的Valaisan域解释为化石海洋-大陆过渡带。

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PILLOWED METABASALTS AND METABRECCIAS FROM THE VALAISAN OCEAN-CONTINENT TRANSITION PRESERVED IN THE BREUIL VALLEY, AOSTA (ITALIAN WESTERN ALPS)

Subduction plate margins have an intrinsically poor preservation potential for pre-subduction settings because most rocks sink and disappear into Earth’s mantle. However, a preserved pre-subduction setting has been reported in the Lower Penninic Units (Valaisan Basin) of the Italian Western Alps (Beltrando et al., 2012). Here, we review two main aspects of the Valaisan Basin cropping out in Italy: the nature of the syn-rift detrital sediments and the characteristics of the metabasalts in proximity to the continental crust metagranitoid. New fossil findings are reported, which confirm a Mesozoic age for the Valaisan rifting. Field and petrographic data from metabreccias and pillowed metabasalts near the fossil-rich high-pressure metasediments support the interpretation of the Valaisan Domain in the Breuil valley (Aosta) as a fossil ocean-continent transition zone.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.