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首页> 外文期刊>Journal of South American earth sciences >Magmatic evolution of ediacaran alkali rhyolites from the Acampamento Velho volcanism in the Tupanci area, southern Brazil: A study based on mineral chemistry, LA-ICP-MS Ti-in-quartz and zircon saturation geothermometry
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Magmatic evolution of ediacaran alkali rhyolites from the Acampamento Velho volcanism in the Tupanci area, southern Brazil: A study based on mineral chemistry, LA-ICP-MS Ti-in-quartz and zircon saturation geothermometry

机译：南巴西汀类省汀瓜谷山脉胚胎碱脉络膜龙羊醛龙岩的岩浆演进：基于矿物化学，La-ICP-MS Ti-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in--in-in-in-in-in-in-in-in-in-in-in-in-in-in--in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in--in-in-in-in-in-in-lircon饱和水平

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摘要

Post-eruptive, metamorphic, and weathering processes are issues that affect not only the identification of geochemical signature but also mineral paragenesis on ancient volcanic successions. Still, the estimate of pressure, temperature and oxygen fugacity conditions prevalent during magma crystallization can be achieved for volcanic systems of any age by combining experimental, thermodynamic and natural data using geothermobarometers. In this regard, highly resistant minerals such as zircon and quartz can provide key information on the origin and evolution of silicic magmatic chambers. For example, the substitution of Ti4+ for Si4+ in quartz is a function of the activity of TiO2 in the magma and in the crystal, temperature and pressure. Therefore, the aim of this study is to apply Ti-in-quartz (TitaniQ) coupled to Zircon saturation geothermometry to provide a better insight into the igneous processes that originated post-collisional Ediacaran sodic-alkaline rhyolites from the Acampamento Velho in southern Brazil. Zircon saturation geothermometry estimates range from ca. 825 degrees C-1000 degrees C (within an error of similar to 25 degrees C), in agreement with previously reported zircon crystallization temperatures for the Acampamento Velho volcanism in the Ramada and Taquaremb ' o plateaus. Temperature estimates using the Ti in quartz thermometer range from 700 to 710 degrees C for the intrusive rocks and from 710 to 810 degrees C for the lava flows that show quartz zonation. The Ti zonation pattern in quartz was probably generated by partial phenocryst dissolution in response to a magma chamber recharge and increase in the pre-eruption temperature. This type of process could be similar to the injection of mafic melts rich in volatiles that originated giant magma bodies, indicating that the Acampamento Velho volcanism was likely formed in a supereruption event with associated caldera collapse, as previously evidenced by detailed petrography studies in other occurrences in the Sul-Rio-Grandense shield.
机译：爆发后，变质和风化过程是影响地球化学签名的鉴定，而且影响古代火山继承的矿物疫苗。仍然，通过使用地热测定仪结合实验，热力学和天然数据，可以对任何年龄的火山系统实现岩浆结晶期间普遍存在的压力，温度和氧气逃逸条件的估计。在这方面，诸如锆石和石英的高度抗性矿物质可以提供有关硅状腔室的起源和演化的关键信息。例如，石英中Si4 +的Ti4 +取代是TiO 2在岩浆中的动力和晶体，温度和压力的函数。因此，本研究的目的是应用Ti-In-ingarz（Titaniq），耦合到锆石饱和地质，以更好地深入了解从巴西南部的Acampamamento Velho源自碰撞后埃迪拉甘氏碱性籽鼻籽籽籽油液的洞察力。锆石饱和地热测定估计范围从CA. 825摄氏度C-1000摄氏度（在类似于25摄氏度的误差内），与先前报道的Zircon结晶温度在Ramada和Taquaremb'o Plateaus中的Acampamamento Velco火山中。在石英温度计中使用TI的温度估计范围为700至710摄氏度，为侵入式岩石和710至810摄氏度，用于显示石英区段的熔岩流。响应于岩浆室补给和预喷发温度的增加，可能通过部分异种溶解来产生石英中的TI区区分区图。这种类型的方法可以类似于富含巨型岩浆体的挥发物的镁奶酪的注射，表明Acampamamento VeloHo火山可能在具有相关的Caldera崩溃中的超硬事件中形成，如前所述，如前所述在其他事件中的详细岩画研究证明在Sul-Rio-Sliensize盾牌中。

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  • 来源
    《Journal of South American earth sciences》 |2020年第2期|102814.1-102814.14|共14页
  • 作者

    Leitzke F. P.; Gervasoni F.; Simoes M. S.; Sommer C. A.; de Lima E. F.; Conceicao R. V.;

  • 作者单位

    Univ Fed Rio Grande do Sul Inst Geociencias Ctr Estudos Petr & Geoquim Lab Geol Isotap BR-91509900 Porto Alegre RS Brazil|Univ Fed Rio Grande do Sul Inst Geociencias Ctr Estudos Petr & Geoquim Lab Geoquim & Petr Expt BR-91509900 Porto Alegre RS Brazil;

    Univ Fed Goias Fac Ciencias & Tecnol BR-74968755 Aparecida De Goiania Brazil;

    Companhia Pesquisa Recursos Minerals CPRM Serv Geol Brasil Superintendencia Reg Manaus AM BR-69067375 Manaus Amazonas Brazil;

    Univ Fed Rio Grande do Sul Inst Geociencias Programa Pasgrad Geociencias BR-91509900 Porto Alegre RS Brazil;

    Univ Fed Rio Grande do Sul Inst Geociencias Programa Pasgrad Geociencias BR-91509900 Porto Alegre RS Brazil;

    Univ Fed Rio Grande do Sul Inst Geociencias Ctr Estudos Petr & Geoquim Lab Geoquim & Petr Expt BR-91509900 Porto Alegre RS Brazil|Univ Fed Rio Grande do Sul Inst Geociencias Programa Pasgrad Geociencias BR-91509900 Porto Alegre RS Brazil;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Rhyolites; Ediacaran; Geothermometry; Post-collisional; Volcanism; Brasiliano/pan-african orogeny;

    机译：胚胎;埃迪亚芳人;地热;后碰撞;火山中;Brasiliano / Pan-African Orenteny;

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