Heat flow in the Central Basin of the Indian Ocean and the northern part of the Afanasy Nikitin Rise

Heat flux data obtained during Cruise 20 of R/V Akademik Mstislav Keldysh in the Central Basin of the Indian Ocean and northern part of the Afanasy Nikitin Rise are presented. Thermal conditions on the rise are not associated with an anomalous zone of the large tectonic deformation block north of it. Geothermal data indicate that the Afanasy Nikitin Rise has formed near an ancient spreading axis. Distribution of measured heat flux values indicates an additional source of heat in the Central Basin resulting from dissipative heating of the crust in the two-stage plate tectonics model.

本文呈现了“姆斯季斯拉夫·凯尔迪什院士”号研究船（R/V Akademik Mstislav Keldysh）第20航次在印度洋中央海盆及阿法纳西·尼基京海隆（Afanasy Nikitin Rise）北部海域获取的热通量数据。该海隆的热状况与其北侧大型构造变形地块的异常带无关联。地热数据表明，阿法纳西·尼基京海隆形成于古扩张轴附近。实测热通量值的分布特征显示，印度洋中央海盆存在额外热源，该热源源于两阶段板块构造模型中地壳的耗散加热作用。