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首页> 外文期刊>Journal of geodynamics >Palaeomagnetism of the Cretaceous Lamproites from Gondwana basin of the Damodar Valley in India and migration of the Kerguelen plume in the Southeast Indian Ocean
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Palaeomagnetism of the Cretaceous Lamproites from Gondwana basin of the Damodar Valley in India and migration of the Kerguelen plume in the Southeast Indian Ocean

机译：印度Damodar谷冈瓦纳盆地白垩系岩岩的古磁性和东南洋克尔盖伦羽的迁移。

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摘要

The paper presents new palaeomagnetic results and reassesses complete set of published palaeomagnetic results on the lamproite intrusions in the Gondwana formations of the Eastern India. Altogether eleven sites register reliable characteristic magnetisations corresponding to the c. 110 Ma emplacement age of the lamproites. A mean ChRM is estimated with D = 331.3 degrees; I = -62.4 degrees (alpha(95) = 6.2 degrees, k = 55; N = 11). The palaeomagnetic pole of lambda = 14.9 degrees : Phi = 287.6 degrees (A(95) = 8.4 degrees) is established for the lamproites and it averaged the secular variation and confirms to the Geocentric Axial Dipole (GAD). The pole compares remarkably well with the grand mean pole reported for the Rajmahal traps that are attributed to represent location of the Kerguelen mantle plume head. The palaeolatitudes transferred to Rajmahal coordinates (25.05 degrees : 87.84 degrees) are situated similar to 6 degrees north of the present location of the Kerguelen hotspot location. The interpretations are consistent with earlier suggestions of southward migration of the plume based on palaeomagnetic results of Site 1138 of the ODP Leg 183 and with the predictions of numerical models of global mantle circulation.
机译：本文介绍了新的古磁结果，并重新评估了印度东部冈瓦纳地层的黑铁矿侵入体中已公布的古磁结果的完整集合。总共11个位置记录了对应于c的可靠特征磁化强度。麻石矿的落入年龄为110 Ma。估计的平均ChRM为D = 331.3度； I = -62.4度（alpha（95）= 6.2度，k = 55； N = 11）。 the铁矿的古地磁极λ= 14.9度：Φ= 287.6度（A（95）= 8.4度），它对长期变化进行了平均，并证实了地心轴向偶极子（GAD）。该极点与Rajmahal圈套所报告的大均极极好，后者代表了克格伦地幔柱头的位置。转移到拉杰马哈尔坐标（25.05度：87.84度）的古纬度位于Kerguelen热点所在地的当前位置以北6度处。这些解释与基于ODP Leg 183站点1138的古磁结果对烟羽向南迁移的早期建议以及全球地幔环流数值模型的预测是一致的。

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