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首页> 外文期刊>Brazilian Journal of Geology >The Pi?oma lineament, southern Espirito Santo: structural expression and tectonic significance
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The Pi?oma lineament, southern Espirito Santo: structural expression and tectonic significance

机译：圣埃斯皮里图州南部的皮奥马氏谱系：结构表达和构造意义

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摘要

The Pi?oma lineament, located in the Southern Esp?-rito Santo State, Brazil, is one of the most prominent linear morphostructural features of the northern Mantiqueira Province. The lineament stands out in satellite images and topographic maps, extending for about 70 km in a N50?°W direction, between the towns of Iconha and Concei?§?￡o do Castelo (Esp?-rito Santo). In order to investigate the nature and role played by the Pi?oma lineament in the tectonic evolution of the Mantiqueira Province and adjacent Campos Basin, we carried out a detailed structural analysis based on fieldwork, as well as geophysical data processing and interpretation. The results we obtained indicate that the Pi?oma lineament is a brittle shear zone characterized by N50W-trending and SW-dipping shear fractures, faults and joints. These structures record two distinct and incompatible motions, thereby recording the operation of two tectonic regimes: NNE-SSW extension and E-W transtension. Comparing our results with the literature on the Southeastern Brazilian Continental Margin, we conclude that the Pi?oma lineament more likely developed after the Ediacaran Brasiliano orogenic event in response to an NNE-SSW extension, experiencing later a reactivation as normal dextral to dextral transtensional zone, probably in connection with the South Atlantic rifting in the Lower Cretaceous.
机译：位于巴西圣埃斯皮里图州南部的皮奥玛（Pi？oma）阵线是曼蒂基拉省北部最显着的线性形态特征之一。沿线图像在卫星图像和地形图中脱颖而出，在Iconha和Concei？§？o do Castelo（Esp？-rito Santo）镇之间沿N50°W方向延伸约70公里。为了调查皮奥马系在曼提基拉省和邻近的坎波斯盆地的构造演化中的性质和作用，我们在实地考察以及地球物理数据处理和解释的基础上进行了详细的结构分析。我们获得的结果表明，Pi？oma系是一个脆性剪切带，其特征是N50W向和西南向剪切断裂，断层和节理。这些结构记录了两个截然不同且不相容的运动，从而记录了两种构造机制的运行：NNE-SSW扩展和E-W扩展。将我们的研究结果与巴西东南部大陆边缘的文献进行比较，我们得出结论，在Ediacaran Brasiliano造山事件响应NNE-SSW扩展后，Pi？oma系更有可能发展，后来又恢复为正常的右旋至右旋跨膜区，可能与下白垩纪的南大西洋裂谷有关。

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