1 引 言 东南亚第三纪时的变形是印度- 欧亚大陆碰撞的结果。在许多关于乐亚第三纪演化的构造模式中,由Tapponnier等(1982)提出的推进挤入模式是被广泛采纳的一个模式。这个模式把印支块体之南和之东作为自由边界,并假定印支可自由转动。印支块体之南的真正自由边界可能造成了现在还在活动的南中国海盆地内的海底扩张作用。由于印支块体可自由继续它的转动和挤出,沿红河断裂不会发生位移方向反转。在后来的文章中,Peltzer和Tap-ponnier(1988)提出了东南亚众多陆块水平位移的尝试性重建图。在他们的重建图中,印度和欧亚间的45Ma至35Ma时的会聚主要朝马来亚半岛、苏门答腊和加里曼丹。因此,这些块体向东南的挤出是沿宾河断裂带和三塔山断裂带进行的。自35至15Ma,会聚主要朝中- 缅- 泰块体和缅甸块体的西部而不是在马来亚和苏门答腊。这次大挤出转入到印支块体和中-缅-泰块体,红河断裂变成了一条主活动左旋板块边界。自15Ma以来,碰撞主要在西藏地区,活跃的挤出更向北和向华南块体(图1)。关于他们重建的主要问题是大印度的大小和形状及大印度随时间相对欧亚位置的确定。本文将尝试更好地确定碰撞前大印度的轮廓(尤其是东北边界),还将考察印度和欧亚板块间会聚速率和角度,以便确定东南亚内的碰撞过程和第 1 Introduction The deformation of the Tertiary in Southeast Asia was the result of the collision between India and Eurasia. Among many tectonic models of evolution of the Loya Tertiary, the push-in mode proposed by Tapponnier et al. (1982) is a widely adopted model. This model treats the south and east of the Indo-China block as a free boundary and assumes Indo-China can rotate freely. The true free border to the south of the Indo-China block may have caused the seabed expansion in the now-functioning South China Sea basin. Since the Indo-China block is free to continue its rotation and extrusion, it will not reverse its direction of displacement along the Red River fault. In a later article, Peltzer and Tap-ponnier (1988) proposed a tentative reconstruction of the horizontal displacement of many land masses in Southeast Asia. In their reconstructions, the 45Ma-35Ma convergence between India and Eurasia focused mainly on the Malay Peninsula, Sumatra and Kalimantan. Therefore, the extrusion of these blocks to the southeast is carried out along the Binhe fault zone and the Three Tashan fault zone. From 35 to 15 Ma, the convergence mainly occurred in the middle of the Central Myanmar-Thailand-Thailand block and the Burmese block instead of in Malaya and Sumatra. This time the large outflow into the Indo-China block and the Central-Burmese-Thai block, the Red River fault became a main activity of the left-hand plate boundaries. Since 15Ma, the clashes have been mainly in Tibet, with active extrusion more northward and toward South China (Figure 1). The main questions about their reconstruction are the size and shape of Great India and the location of Greater India over Eurasia over time. This article will try to better determine the contours of the Great Indian continent before the collision (especially the northeastern boundary) and will also examine the convergence rates and angles between the Indian and Eurasian plates in order to determine the collision processes and