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.

该提案的目的是对海洋壳中长毛岩浆形成的地球化学和实验性岩石学研究，这将有助于理解1）导致长石壳材料的分馏过程，2）岩浆在海洋壳中的动力学和3）岩浆与水热壁岩的相互作用。首先，我们建议详细研究阿曼蛇绿岩的长石岩石岩石以及相关的镁铁质岩石，这些岩石岩石可能代表父母岩浆和水热改变的壁岩石，这些壁岩可能因不断发展的岩浆而被不断发展或可能部分融化以产生毛cer虫。其次，我们将研究一套来自太平洋 - 北极崛起的玄武岩，安第斯山脉和dacitic熔岩，这是一个具有丰富的长英质火山症的快速蔓延的山脊。我们打算在样品中对整个岩石，火山玻璃，表晶和异种晶体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来定义矿物 - 液体平衡，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个博士生进行，他们将紧密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

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

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

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