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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Layered gabbros and peridotites from Piton des Neiges volcano, La Reunion Island
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Layered gabbros and peridotites from Piton des Neiges volcano, La Reunion Island

机译：来自Piton des Neiges Volcano，La Reunion Island的分层Gabbros和Peridotites

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摘要

We conducted a petrological study of the layered gabbros and peridotites outcropping in the cirque of Salazie, combining field investigations, geochemistry, petrography and, mineralogy to constrain the magmatic evolution of Piton des Neiges volcano (La Reunion). Three new hectometer-long outcrops are reported here (Sites 1, 2 and 3) in addition to the gabbroic series (hereafter named Site 4) previously described in the literature. The Sites 1 and 2 are located in the upper parts of the Mat River and show dunite and wehrlite units with no apparent foliation, lineation, or layering. The Sites 3 and 4 are located in the lower parts of the river and are made of olivine-gabbro, gabbro and ferrogabbro units showing marked foliation and lineation, and abundant layering. The mean composition of primary phases varies between Sites 1-2 and Sites 3-4: Fo(89.5 )to F-0.69 in olivine, Mg# of 90 to 69 in dinopyroxene, and Mg# of 44 to 0 in Cr-spinel, titanomagnetite and, ilmenite, respectively. Here we show that the layered gabbros and peridotites exposed at the four sites represent multiple levels of magma storage. Based on the results of previous gravimetric studies and a drill hole related to geothermal exploration, we propose that the gabbroic series belongs to a magmatic system predating the building of Piton des Neiges and centered underneath the cirque of Salazie. The high volume of erupted materials in the NE quadrant of the volcanic edifice, and the southward magmatic flow direction in the layered gabbros suggest that the initial eruptive center of Proto-Piton des Neiges was above the cirque of Salazie, similar to 3 km north of the present-day summit. The landscape of Piton des Neiges may have changed when its NE flank experienced a major lateral collapse, after complete solidification of the gabbroic bodies. The magmatic activity, then, shifted southward after the flank collapse. Finally, we suggest that peridotites outcrops are associated with the present-day Piton des Neiges. (C) 2020 Elsevier B.V. All rights reserved.
机译：我们在Salazie的Circuque中展开了分层的Gabbros和Peridotites的岩石学研究，结合了现场调查，地球化学，岩画和，矿物学来限制Piton des Neiges火山（La Reunion）的岩浆演进。除了在文献中先前描述的Gabbroce系列（以下简称名称的站点4）之外，还报告了三个新的富升率长露头（Sites 1,2和3）。位置1和2位于垫子河的上部，显示Dunite和Wehrite单位，没有明显的叶，线eation或分层。景点3和4位于河流的下部，由橄榄石 - 加布，Gabbro和Ferrogbro单位制成，显示出标记的叶和基础曝光，以及丰富的分层。初级相的平均组成在橄榄石的位置1-2和位点3-4：Fo（89.5）至F-0.69中，Mg＃90至69中的Dinocoopyxene，以及Cr-spinel中的Mg＃的Mg＃钛磁石和，ilmenite分别。在这里，我们表明，在四个站点暴露的层状Gabbros和eridoTites代表了多个水平的岩浆存储。基于先前的重量研究和与地热勘探相关的钻孔的结果，我们提出了古桥系列属于岩石系统，这些系统预测Piton des Neiges建筑，并以萨拉西的圆柱形为中心。在火山大厦的NE象限中的大量爆发材料，以及层叠的Gabbros中的南方岩石流动方向表明，Proto-piton des Neiges的初始喷发中心位于Salazie的凯西之上，北方3公里现在的峰会。在完全凝固的Gabbroice凝固后，Piton des Neiges的景观可能发生了变化。然后，岩浆活性在侧翼塌陷后向南移动。最后，我们建议橄榄石露头与现在的Piton des Neiges相关联。 （c）2020 Elsevier B.v.保留所有权利。

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  • 来源
    《Journal of Volcanology and Geothermal Research》 |2020年第1期|107039.1-107039.23|共23页
  • 作者

    Berthod C.; Michon L.; Famin V; Welsch B.; Bachelery P.; Bascou J.;

  • 作者单位

    Univ Clermont Auvergne Lab Magmas & Volcans OPGC CNRS IRD 6 Ave Blaise Pascal F-63178 Aubiere France|Univ La Reunion Lab GeoSci Reunion F-97744 St Denis France|Univ Paris Inst Phys Globe Paris CNRS F-75005 Paris France;

    Univ La Reunion Lab GeoSci Reunion F-97744 St Denis France|Univ Paris Inst Phys Globe Paris CNRS F-75005 Paris France;

    Univ La Reunion Lab GeoSci Reunion F-97744 St Denis France|Univ Paris Inst Phys Globe Paris CNRS F-75005 Paris France;

    Univ Hawaii Manoa Dept Earth Sci 1680 East West Rd Honolulu HI 96822 USA;

    Univ Clermont Auvergne Lab Magmas & Volcans OPGC CNRS IRD 6 Ave Blaise Pascal F-63178 Aubiere France;

    Univ Lyon Univ Jean Monnet F-42023 St Etienne France|UMR CNRS 6524 Lab Magmas & Volcans F-42023 St Etienne France;

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  • 正文语种 eng
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  • 关键词

    La Reunion; Piton des Neiges; Shield volcano; Plutonic complex; Layered intrusion; Gabbro; Peridotite;

    机译：La Reunion;Piton des Neiges;盾牌火山;Plutonic Complex;分层侵入;Gabbro;eridoTite;

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