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首页> 外文期刊>Journal of Asian earth sciences >Paleomagnetic study of 1765 Ma dyke swarm from the Singhbhum Craton: Implications to the paleogeography of India
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Paleomagnetic study of 1765 Ma dyke swarm from the Singhbhum Craton: Implications to the paleogeography of India

机译：Singhbhum Craton 1765年Ma堤防群的古地磁研究：对印度古地理的启示

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摘要

We report the first key paleopole as a result of paleomagnetic study on a precisely dated 1765.3 +/- 1.0 Ma WNW-ESE trending dyke swarm from Singhbhum Craton. This pole has been used in this study to propose the paleogeographic reconstruction of India with Baltica Craton and North China Craton. Incremental alternating field (AF) and thermal demagnetization, isolated high coercivity components with north to north-westerly declination and shallow negative inclination from 9 sampling sites which are representing different individual dykes. The primary origin of the ChRM is supported by the positive baked contact test. The WNW-ESE trending dykes yield a mean paleomagnetic direction with a declination = 329.2 degrees and an inclination = -22.8 degrees (k = 31.6; alpha 95 = 9.3 degrees). The positive bake contact test proves the primary nature of remanence. The pole position of Singhbhum Craton at 1765 Ma is 45 degrees N, 311 degrees E (dp = 5.2 and dm = 9.9). Paleogeographic reconstruction at ca. 1770 Ma, supported by geological, tectonic and metallogenic evidences indicate that the Baltica Craton and India linkage can be stable for at least similar to 370 Ma (similar to 1770-1400 Ma). There is also reasonable evidence in support of India-North China Craton spatial proximity at similar to 1770 Ma.
机译：我们报告了古生物学对Singhbhum Craton精确标定的1765.3 +/- 1.0 Ma WNW-ESE趋势堤群的古磁研究结果。该极点已用于本研究中，以提议与Baltica Craton和North China Craton一起进行印度古地理重建。增量交变场（AF）和热退磁，从9个采样点分离出高矫顽力分量，这些分量具有北向西北偏角和浅负偏角，分别代表不同的堤坝。 ChRM的主要来源由阳性烘烤接触测试支持。 WNW-ESE趋势堤产生的平均古磁方向的磁偏角= 329.2度，斜度= -22.8度（k = 31.6；α95 = 9.3度）。积极的烘烤接触测试证明了剩磁的基本性质。 Singhbhum Craton在1765 Ma处的极点位置为北纬45度，东经311度（dp = 5.2和dm = 9.9）。约古地理重建在地质，构造和成矿证据的支持下，1770 Ma的存在表明波罗的海克拉通和印度的联系至少在类似于370 Ma（类似于1770-1400 Ma）方面可以是稳定的。也有合理的证据支持印度-华北克拉通的空间接近度接近1770 Ma。

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