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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Chemostratigraphy and evolution of the Parana Igneous Province volcanism in the central portion of the state of Parana, Southern Brazil
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Chemostratigraphy and evolution of the Parana Igneous Province volcanism in the central portion of the state of Parana, Southern Brazil

机译：巴西南部巴拉那州中部巴拉那火成岩省火山化学的地层学和演化

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摘要

Analysis of borehole samples offers the potential to investigate the chemostratigraphic variations of a large igneous province in subsurface. New geochemical data based on multielement analyses of 829 chip samples that were obtained during the drilling of seven deep boreholes is presented for the central area of the Parana Igneous Province (PIP). In order to detail the compositional variations found within the two main types from the Central Northern Subprovince (CNSP), simple statistical treatment was carried out for part this database. Thus, the combination of low (L) and high (H) contents of Th, Nb, La and Yb was used as a means to create 16 geochemical sub-types for the Type 4 (LSi-LZr-HTi-HP) sequence. Likewise, other four elements (Cr, Ni, Cu and Pd) were selected with the same intention for the Type 1 (Central-Northern) (LSi-LZr-LTi-LP) sequence. When subtypes are plotted in the cross section, it is possible to observe that those with similar characteristics tend to be associated in groups (cycles). This analysis showed that the volcanic pile can be divided into at least eleven different cycles and also that they are laterally continuous throughout the section. The compositional changes observed in these volcanic cycles also display correlations with Mg#, Zr, Ti/Y and La/Sm-N ratios, for example. Therefore, since the reservoir is marked by periods of injection of more differentiated or more mafic magmas, it could be suggested that it was periodically recharged with batches of magma from the parental source. (C) 2017 Elsevier B.V. All rights reserved.
机译：钻孔样品的分析为研究地下大火成岩省的化学地层变化提供了潜力。在巴拉那火成岩省（PIP）的中部地区，根据对829个切屑样本进行多元素分析得出的新地球化学数据，这些数据是在七个深钻孔的钻探过程中获得的。为了详细说明北部中部省（CNSP）的两种主要类型中的成分变化，对该数据库的一部分进行了简单的统计处理。因此，Th，Nb，La和Yb的低（L）和高（H）含量的组合被用作创建4型序列（LSi-LZr-HTi-HP）的16种地球化学亚型的手段。同样，为类型1（中北部）（LSi-LZr-LTi-LP）序列选择了相同意图的其他四个元素（Cr，Ni，Cu和Pd）。当在横截面中绘制子类型时，可以观察到具有相似特征的子类型倾向于以组（循环）的形式关联。该分析表明，火山桩至少可分为11个不同的循环，并且在整个剖面中它们在横向上都是连续的。例如，在这些火山循环中观察到的成分变化也显示出与Mg＃，Zr，Ti / Y和La / Sm-N比的相关性。因此，由于该储层的特征是注入了更多分化或更多的镁铁质岩浆，因此建议该储层定期从母源中注入一批岩浆。 （C）2017 Elsevier B.V.保留所有权利。

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