For the first time, a detailed density 3D model of the lithosphere of the Sikhote-Alin orogenic belt to a depth of 130 km has been created. Two extended submeridional linear zones of low density are distinguished in the upper mantle and characterized. Large tin and gold deposits in the northern Sikhote-Alin are spatially confined to these zones. The present-day density structure of the lithosphere in the region, the formation of which began at the turn from the Late Jurassic to the Early Cretaceous, reflects its density differentiation resulting from the two main geodynamic processes: (1) a subduction regime replaced by a transform regime of the Bureya-Sikhote-Alin active continental margin, the stage (s) of which was (were) characterized by the emergence of mantle low-density zones, associated with the ascent of fluids and melts in the suprasubduction mantle wedge and the formation of intermediate magma chambers; and (2) intraplate rifting, spatially localized in zones of mantle thickening.

中文翻译：

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锡霍特-阿林造山带岩石圈密度结构

首次创建了深度 130 公里的锡霍特-阿林造山带岩石圈的详细密度 3D 模型。在上地幔中可以区分出两个扩展的低密度水下线性带并对其进行表征。Sikhote-Alin 北部的大型锡和金矿床在空间上仅限于这些区域。该地区岩石圈的现代密度结构，其形成开始于晚侏罗世至早白垩世之交，反映了其由两个主要地球动力学过程引起的密度分异：（1）俯冲制度取代Burya-Sikhote-Alin 活动大陆边缘的转变机制，其阶段的特征是地幔低密度区的出现，与超俯冲地幔楔中流体和熔体的上升以及中间岩浆房的形成有关；(2) 板内裂谷，在空间上位于地幔增厚区。