The generation of felsic magmas in the oceanic crust: assimilation-fractional crystallization processes versus re-melting of the crust

洋壳中长英质岩浆的生成：同化分异结晶过程与地壳重熔

• 批准号: 158990368
• 负责人: Professor Dr. Karsten Matthias Haase
• 金额: --
• 依托单位: Institut für Mineralogie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/158990368?language=en
• 关键词: generation; felsic; magmas; oceanic; crust

The aim of the proposal is a combined geochemical and experimental petrological study of the formation of felsic magmas within the oceanic crust which will help to understand 1) fractionation processes leading to felsic crustal material, 2) the dynamics of magma ascent in the oceanic crust, and 3) the interaction of magmas with hydrothermally altered wall rocks. Firstly, we suggest to study in detail felsic magmatic rocks of the Oman Ophiolite as well as related mafic rocks which could represent parental magmas and hydrothermally altered wall rocks which may have been assimilated by evolving magmas or may have been partially molten to yield the felsic melts. Secondly, we will study a suite of basaltic, andesitic and dacitic lavas from the Pacific-Antarctic Rise, a fast-spreading ridge with abundant felsic volcanism. We intend to perform geochemical and isotopic analyses on the whole rocks, volcanic glasses, phenocrysts and xenocrysts in the samples and use the representative samples for the experimental study to define mineral-liquid equilibria, trace element partition coefficients, and possible melting or crystallization relationships. These two different approaches will be carried out by two PhD students who will work closely together and use the same sample material.

该提案的目的是对洋壳内长英质岩浆的形成进行地球化学和实验岩石学的综合研究，这将有助于了解 1) 导致长英质地壳物质的分馏过程，2) 洋壳中岩浆上升的动力学， 3）岩浆与热液蚀变围岩的相互作用。首先，我们建议详细研究阿曼蛇绿岩的长英质岩浆岩以及相关的镁铁质岩石，这些岩石可以代表母岩浆和热液蚀变的围岩，这些围岩可能已被演化的岩浆同化或可能已部分熔融以产生长英质熔体。其次，我们将研究一组来自太平洋-南极隆起的玄武质、安山质和英安质熔岩，这是一个快速扩张的山脊，富含长英质火山活动。我们打算对样品中的整个岩石、火山玻璃、斑晶和异晶进行地球化学和同位素分析，并使用代表性样品进行实验研究，以确定矿液平衡、微量元素分配系数以及可能的熔融或结晶关系。这两种不同的方法将由两名博士生实施，他们将密切合作并使用相同的样本材料。

项目成果

Melts of sediments in the mantle wedge of the Oman ophiolite

• DOI: 10.1130/g36451.1
• 发表时间: 2015-04
• 期刊: Geology
• 影响因子: 5.8
• 作者: K. Haase;S. Freund;J. Koepke;F. Hauff;M. Erdmann

Constraints on the magmatic evolution of the oceanic crust from plagiogranite intrusions in the Oman ophiolite

阿曼蛇绿岩斜长花岗岩侵入体对洋壳岩浆演化的制约

• DOI: 10.1007/s00410-016-1261-9
• 发表时间: 2016
• 期刊: Contributions to Mineralogy and Petrology
• 影响因子: 3.5
• 作者: Freund;Koepke;Erdmann
• 通讯作者: Erdmann

Experimental temperature cycling as a powerful tool to enlarge melt pools and crystals at magma storage conditions

• DOI: 10.2138/am-2016-5398
• 发表时间: 2016-03-01
• 期刊: AMERICAN MINERALOGIST
• 影响因子: 3.1
• 作者: Erdmann, Martin;Koepke, Jurgen
• 通讯作者: Koepke, Jurgen

Anatexis at the roof of an oceanic magma chamber at IODP Site 1256 (equatorial Pacific): an experimental study

• DOI: 10.1007/s00410-015-1136-5
• 发表时间: 2015-04
• 期刊: Contributions to Mineralogy and Petrology
• 影响因子: 3.5
• 作者: M. Erdmann;L. Fischer;L. France;Chao Zhang;M. Godard;J. Koepke

Oxygen isotope evidence for the formation of andesitic-dacitic magmas from the fast-spreading Pacific-Antarctic Rise by assimilation-fractional crystallisation

• DOI: 10.1016/j.chemgeo.2013.04.013
• 发表时间: 2013-06
• 期刊: Chemical Geology
• 影响因子: 3.9
• 作者: S. Freund;C. Beier;S. Krumm;K. Haase