The Yadong-Golmud Geoscience Transect in the Qinghai-Tibet Plateau

On the basis of abundant geological and geophysical data. 6 terranes have been distinguished on theQinghai-Tibet Plateau. The plateau is a single integrated lithospheric unit although it is divided into blocks.With Amdo as a boundary. the crust may be divided into two parts with different crustal structures. The struc-ture in the southern part is complex, while that in the northern part is simple. The current study has revealedthat 8 factors such as slab subduction. overthrust and superimposition are responsible for crustal shorteningand thickening in the region. The uplift of this region is possibly due to northward compression of the Indianplate and southward compression of the Eurasian plate with the former predominating. The compression led tothe asthenospheric movements which were also influenced by thermal activity caused by doming at the bound-ary between the core and mantle.

青藏高原锡铁山—格尔木—亚东剖面地温分布特征

以青藏高原锡铁山—格尔木—亚东剖面作为研究对象,测定不同深度土层的温度。结果表明,除北部柴达木地块地温高出其它地块外,该剖面总体上呈现出青藏高原各地块地温状况南高北低的现象:以拉萨—冈底斯地块的地温为最高,其次为喜马拉雅地块,北部的羌塘地块、可可西里-巴颜喀拉地块、昆仑地块的地温依次降低。测量结果较好地对应于各地块及断裂带的划分,断裂带温度明显高出相邻低温地块温度,并且以狮泉河—雅鲁藏布江断裂带为最高。该试验方法较好地反映了青藏高原热活动状况,为青藏高原热动力学研究提供了依据。

基于热红外遥感的热环境区划研究

青藏高原的热环境的变化,不仅对我国,对亚洲乃至北半球的大气环流均具有极为重要的作用,直接影响着东亚季风气候的形成和演变。用亚东-格尔木-锡铁山走廊域的地学剖面实测温度数据和青藏高原MODIS遥感影像数据,研究分析了该走廊域的热环境特征。研究表明,在研究区域内热环境分布具有明显的南北条带性:西北部的温度偏低,东南部次之,中东部温度最高。