Schweizerische Mineralogische Und Petrographische Mitteilungen最新文献_第2页

The newly defined "Greenstone Unit'' of the Aiguilles Rouges massif (western Alps): remnant of an Early Palaeozoic oceanic island-arc ? 新定义的Aiguilles rouge地块(西阿尔卑斯山)的“绿岩单元”:早古生代海洋岛弧的遗迹?

Schweizerische Mineralogische Und Petrographische Mitteilungen Pub Date : 1900-01-01 DOI: 10.5169/SEALS-60208

C. Dobmeier, H. Pfeifer, J. V. Raumer

{"title":"The newly defined \"Greenstone Unit'' of the Aiguilles Rouges massif (western Alps): remnant of an Early Palaeozoic oceanic island-arc ?","authors":"C. Dobmeier, H. Pfeifer, J. V. Raumer","doi":"10.5169/SEALS-60208","DOIUrl":"https://doi.org/10.5169/SEALS-60208","url":null,"abstract":"In the southwestern part of the Aiguilles Rouges massif (pre-Alpine\u0000basement of the Helvetic realm, western Alps), a metavolcanic sequence,\u0000newly defined as the ``Greenstone Unit'',is exposed in two NS trending\u0000belts of several 100 metres in thickness. It consists of epidote\u0000amphibolites, partly epidote and/or calcic amphibole-bearing\u0000greenschists, and small amounts of alkali feldspar-bearing greenschists,\u0000which underwent low- to medium-grade metamorphism during Visean oblique\u0000collision. Metamorphic calcic amphiboles and epidotes show strong\u0000chemical zoning, whereas metamorphic plagioclase is exclusively albitic\u0000in composition (An 1-3). The SiO2 content of the subalkaline tholeiitic\u0000to calc-alkaline suite ranges continuously from 44 wt% to 73 wt%,but\u0000andesitic rocks predominate. The majority of samples have chemical\u0000compositions close to recent subduction-related lavas; some are even\u0000restricted to recent oceanic arcs (extremely low Ta and Nb contents,\u0000high La/Nb and Th/Ta ratios). But several basaltic to basalto-andesitic\u0000samples resemble continental tholeiites (low Th/Ta, La/Nb ratio). As it\u0000is very probable that both lava types are to some extent\u0000contemporaneous, it is proposed that the Greenstone Unit represents a\u0000former oceanic volcanic are which temporarily underwent extension during\u0000which emplacement of continental tholeiite-like rocks occurred. The\u0000cause of the extension remains ambiguous. Considering palaeotectonic\u0000significance and age of other metavolcanic units in the Aiguilles Rouges\u0000massif, the Greenstone Unit most likely formed in the Early Palaeozoic.","PeriodicalId":407711,"journal":{"name":"Schweizerische Mineralogische Und Petrographische Mitteilungen","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114196395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Über Metamorphose und Deformation der östlichen Malenco-Ultramafitite und deren Rahmengesteine (Prov. Sondrino, N-Italien) 关于东方玛雷科超级黑手党及其框架岩石的变形和变质。(Sondrino N-Italien)

Schweizerische Mineralogische Und Petrographische Mitteilungen Pub Date : 1900-01-01 DOI: 10.5169/SEALS-41383

K. Bucher, H. Pfeifer

引用次数: 8

Derivation and application of a solution model for calcic garnet 钙石榴石溶液模型的推导与应用

Schweizerische Mineralogische Und Petrographische Mitteilungen Pub Date : 1900-01-01 DOI: 10.5169/SEALS-51587

M. Engi, P. Wersin

引用次数: 38

K-Ar radiometric ages of the gold-quartz veins at Brusson, Val d'Ayas, NW Italy: evidence of mid-Oligocene hydrothermal activity in the Northwestern Alps 意大利西北部阿亚斯谷Brusson金石英脉的K-Ar辐射年龄:阿尔卑斯西北部中渐新世热液活动的证据

Schweizerische Mineralogische Und Petrographische Mitteilungen Pub Date : 1900-01-01 DOI: 10.7892/BORIS.90851

L. Diamond, M. Wiedenbeck

引用次数: 22

U-Pb ages of magmatic rocks of the western Austroalpine Dent-Blanche-Sesia unit 西澳阿尔卑斯Dent-Blanche-Sesia单元岩浆岩U-Pb年龄

Schweizerische Mineralogische Und Petrographische Mitteilungen Pub Date : 1900-01-01 DOI: 10.5169/SEALS-59281

F. Bussy, G. Venturini, J. Hunziker, G. Martinotti

引用次数: 67

Strontium isotope systematics in two glaciated crystalline catchments : Rhone and Oberaar Glaciers (Swiss Alps) 两个冰川结晶集水区:罗纳和奥伯拉冰川(瑞士阿尔卑斯山)的锶同位素系统

Schweizerische Mineralogische Und Petrographische Mitteilungen Pub Date : 1900-01-01 DOI: 10.7892/BORIS.86667

K. Arn, R. Hosein, K. Föllmi, P. Steinmann, D. Aubert, J. Kramers

引用次数: 16

Essai de zonéographie métamorphique entre les Diablerets et le massif de l'Aar (Suisse occidentale), basée sur l'étude des Grès de Taveyanne 基于Taveyanne砂岩研究的Diablerets和aar地块(瑞士西部)之间的变质带地貌试验

Schweizerische Mineralogische Und Petrographische Mitteilungen Pub Date : 1900-01-01 DOI: 10.5169/SEALS-49538

F. Bussy, J.-L. Epard

引用次数: 13

Eo/Oligocene (35 Ma) high-pressure metamorphism in the Monte Rosa nappe (Western Alps): implications for paleogeography 西阿尔卑斯罗萨山推覆带Eo/渐新世(35 Ma)高压变质作用:古地理意义

Schweizerische Mineralogische Und Petrographische Mitteilungen Pub Date : 1900-01-01 DOI: 10.5169/SEALS-60212

D. Rubatto, M. Gervers

引用次数: 11

Mesozoic ophiolite relics in the Southern Steep Belt of the Central Alps 中阿尔卑斯南陡坡带中生代蛇绿岩遗迹

Schweizerische Mineralogische Und Petrographische Mitteilungen Pub Date : 1900-01-01 DOI: 10.7892/BORIS.86658

A. Stucki, D. Rubatto, V. Trommsdorff

引用次数: 20

Phasenbeziehungen im Tonalit der Bergeller Intrusion 贝格尔注入黏土

Schweizerische Mineralogische Und Petrographische Mitteilungen Pub Date : 1900-01-01 DOI: 10.3929/ETHZ-A-000475536

Charles Eric Reusser

引用次数: 29