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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Paleomagnetism of the Yuanmou Basin near the southeastern margin of the Tibetan Plateau and its constraints on late Neogene sedimentation and tectonic rotation
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Paleomagnetism of the Yuanmou Basin near the southeastern margin of the Tibetan Plateau and its constraints on late Neogene sedimentation and tectonic rotation

机译：青藏高原东南缘附近元谋盆地的古磁性及其对新近晚期沉积和构造旋转的制约

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摘要

New paleomagnetic investigation was carried out on the late Neogene fluviolacustrine sequence of the Yuanmou Basin, located near the southeastern margin of the Tibetan Plateau. Magnetostratigraphic results indicate nine reverse magnetozones (R1 to R9) and eight normal magnetozones (NI to N8) in the sedimentary profile, which can be correlated to the geomagnetic polarity timescale from C3n.3r to C1 r.1r. The age of the sedimentary sequence of the Yuanmou Basin can thus be paleomagnetically constrained to an interval from early Pliocene to Pleistocene, with sedimentation rates varying from 12.5 to 55 cm/kyr. In addition to its highly resolved rnagnetostratigraphic sequence, the Yuanmou Basin provides a record of Plio-Pleistocene tectono- and climato-sedimentary processes. The mean declinations of the seventeen polarity units (excluding samples with transitional directions) can be grouped into three distinct directional intervals, Group I (2.58-1.37 Ma), Group II (4.29-2.58 Ma) and Group III(4.91-4.29 Ma). These directions indicate that the Yuanmou Basin has probably experienced vertical-axis clockwise rotation of about 12 degrees from 1.4 Ma to 4.9 Ma, which may be related to slip activity of the Red River fault to the southwest and the Xianshuihe-Xiaojiang fault to the east.
机译：在青藏高原东南缘附近的元谋盆地的新近纪新潮氟胶体序列上进行了新的古磁研究。磁地层学结果表明，沉积剖面中有9个反向磁区（R1至R9）和8个正常磁区（NI至N8），它们与从C3n.3r到C1r.1r的地磁极性时标相关。因此，元谋盆地的沉积层序年龄可以被古磁约束到从上新世到更新世的一个间隔，沉积速率在12.5至55 cm / kyr之间变化。元谋盆地除了具有高度解析的核层地层序列外，还提供了上新世-上新世构造和气候沉积过程的记录。十七个极性单元的平均偏角（不包括具有过渡方向的样本）可以分为三个不同的方向区间：I组（2.58-1.37 Ma），II组（4.29-2.58 Ma）和III组（4.91-4.29 Ma） 。这些方向表明，元谋盆地可能经历了垂直轴顺时针方向从1.4 Ma到4.9 Ma约12度旋转，这可能与西南部的红河断层和东部的咸水河-小江断层的滑动活动有关。 。

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