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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 >Paleomagnetic directions in Late Precambrian glaciomarine sediments of the Mirbat Sandstone Formation, Oman
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Paleomagnetic directions in Late Precambrian glaciomarine sediments of the Mirbat Sandstone Formation, Oman

机译：阿曼Mirbat砂岩组前寒武纪晚期冰川沉积物中的古磁方向

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摘要

A paleomagnetic study has been carried out in the Late Precambrian glaciomarine Mirbat Sandstone Formation in the Sultanate of Oman. Limited availability and geographical distribution of outcrops restricted the sampling to six sites. Of these, three were in laminated, fine-grained clay- to siltstones and three in laminated carbonates. One of these sites was rejected. The remaining five sites, represented by a total of 21 samples, displayed a similar magnetic component during progressive thermal demagnetization between 0 and 500 ℃. The site mean pole calculated from this component is at 86.5°N 328.1°E (δp = 11.2°, δm = 19.7°). This low-temperature component is interpreted as the direction of the average recent geomagnetic field in Oman. Two sites (10 samples) revealed a consistent magnetic component above 500 ℃. The sample mean declination of 68.4° and inclination of 18.4° (k = 46.4, α_(95) = 7.2°) are interpreted as the characteristic remanent magnetization. The Late Precambrian Arabian pole position computed from the samples at these two sites lies at 23.3°N 141.8°E (δp = 3.9°, δm = 7.5°). Rotated into West African coordinates, the resulting pole position is at 31.6°N 153.2°E, in good agreement with published poles from Gondwana of Late Precambrian age (～550 Ma). The resulting paleolatitude is about 9.4° indicating a low-latitude of deposition for the glaciomarine deposits of the Mirbat Sandstone Formation.
机译：在阿曼苏丹国的前寒武纪前冰河纪海洋Mirbat砂岩组中进行了古磁研究。露头的可用性和地理分布有限，因此只能在六个地点进行采样。其中，三层为层状，细粒粘土-粉砂岩，三层为层状碳酸盐。这些站点之一被拒绝了。其余5个站点（共21个样本）在0至500℃的渐进热退磁过程中显示出相似的磁性成分。由该分量计算出的位置平均极点位于86.5°N 328.1°E（δp= 11.2°，δm= 19.7°）。将此低温分量解释为阿曼最近平均地磁场的方向。两个位置（10个样品）在500℃以上显示出一致的磁性成分。样品平均磁偏角为68.4°，倾角为18.4°（k = 46.4，α_（95）= 7.2°）被解释为特征剩磁。根据这两个位置的样本计算出的前寒武纪晚期阿拉伯极点位置位于23.3°N 141.8°E（δp= 3.9°，δm= 7.5°）。旋转成西非坐标，得到的极点位置为31.6°N 153.2°E，与前寒武纪晚期（〜550 Ma）冈瓦纳发布的极点高度吻合。所产生的古纬度约为9.4°，表明Mirbat砂岩组的冰川海洋沉积物的沉积纬度低。

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