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首页> 外文期刊>Journal of geodynamics >New paleomagnetic data from the northern Puna and western Cordillera Oriental, Argentina: a new insight on the timing of rotational deformation
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New paleomagnetic data from the northern Puna and western Cordillera Oriental, Argentina: a new insight on the timing of rotational deformation

机译：来自阿根廷北部Puna和西部Cordillera Oriental的新古地磁数据：对旋转变形时间的新见解

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Along the Central Andes a pattern of vertical axis tectonic rotations has been paleomagnetically identified. The rotations are clockwise in southern Bolivia, northern Chile and northwestern Argentina. Various models have been proposed to explain the geodynamic evolution of the Central Andes, but the driving mechanism of these rotations remains controversial. Constraining the spatial variability and the timing of the rotations may contribute to a better understanding of their origin. Our results complement information from previous studies, improving the knowledge of tectonic rotations in the region of the northern Argentine Puna and western Cordillera Oriental. In the San Juan de Oro basin (SJOB), 132 cores were drilled from the middle Miocene Tiomayo Formation in the zone of Tiomayo-Santa Ana (22°30′S-66°30′W), and from the ～17 Ma Casa Colorada dacite dome complex. Another 114 cores were collected from middle Miocene dacitic dome centers emplaced in the zone of Laguna de Pozuelos basin (22°30′S-66°00′W). The results of our paleomagnetic study suggest that the sampled zones underwent very low, statistically insignificant rotation since middle Miocene. However, a tendency for low magnitude rotation appears when observing our data together with paleomagnetic results from coeval rocks in neighbouring areas. If so, this low rotation could be related to middle Miocene thrust activity in the central and eastern parts of the Cordillera Oriental. The combined analysis of paleomagnetic and structural data illustrates the probable, direct relationship between timing of significant rotations and timing of local deformation in the sourthern Central Andes.
机译：沿着安第斯山脉中部，已经以古磁法确定了垂直轴构造旋转的模式。玻利维亚南部，智利北部和阿根廷西北部是顺时针旋转。已经提出了各种模型来解释安第斯山脉中部的地球动力学演化，但是这些旋转的驱动机制仍存在争议。限制空间可变性和旋转的时间可能有助于更好地了解其起源。我们的结果补充了先前研究的信息，提高了阿根廷北部普纳和西部东方山脉地区构造旋转的知识。在圣胡安德奥罗盆地（SJOB），从Tiomayo-Santa Ana（22°30′S-66°30′W）的中新世Tiomayo组中段和〜17 Ma Casa钻了132个岩心科罗拉多达西特穹顶建筑群。从位于Laguna de Pozuelos盆地（22°30′S-66°00′W）区域的中新世中部大洋穹顶中心收集了另外114个岩心。我们的古地磁研究结果表明，自中新世以来，采样区的旋转非常低，在统计上是无关紧要的。但是，当观察我们的数据以及邻近地区的同年龄岩石的古磁结果时，就会出现低震级旋转的趋势。如果这样的话，这种低旋转可能与东方山脉中部和东部的中新世中期逆冲活动有关。古磁和结构数据的组合分析表明，南安第斯中部大旋转的时机与局部变形的时机之间可能存在直接关系。

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