Abstract: For studying partial melting possibly existed in the lower crust of Tibetan Plateau, the principle of the laser flash method (LFM) is analyzed. Result is that thermal conductivity measured by the LFM only includes lattice component. Further computations show that during the uplifting of the Tibetan Plateau the thermal conductivity is not the only controlling factor to produce melting material in the crust. Large-scale magmatism would be the result of a combined action produced by dissipated heat, involvement of water, accumulation of radioactive elements, as well as relatively low thermal conductivity in the crust.

Key words: lithosphere, Tibetan Plateau, crust, thermal conductivity, thermal structure, magmatism

摘要： 针对青藏高原下部地壳物质如何产生部分熔融的问题, 对测量地壳岩石热扩散率的激光闪光法的测量方法进行分析, 认为该方法的测量结果只能给出岩石的晶格热导率。计算结果表明, 青藏高原在隆升过程中, 仅由热传导因素不能导致该地区地壳物质的部分熔融, 大范围的岩浆活动应该是耗散热、水的参与、放射性物质的富集及下地壳相对低的热导率共同作用的结果。

关键词: 岩石圈, 青藏高原, 地壳, 热导率, 热结构, 岩浆活动