柴达木地块晚石炭世的古地理位置

作者由柴达木地块上得到的晚石炭世灰岩和砂岩的古地磁资料表明,该地块在晚石炭世时位于北纬26°,与当时的塔里木地块相邻或可能是塔里木地块的一部分。因而,柴达木地块应是安哥拉古陆的南界。晚石炭世之后,柴达木地块上的采点相对于塔里木地块有过运动,表现为柴达木地块相对于塔里术地块沿阿尔金断层向东移动和作顺时针旋转。

GEOGRAPHIC POSITION OF THE QALDAM BLOCK IN LATE CARBONIFEROUS

New paleomagnetic results from limestone and sandstone of the Late Carboniferous in the Qaidam block suggest that the Qaidam block was 26?north latitude in the Late Carboniferous about the same latitude as the Tarim block and probably had accreated to the Tarim block. Later, the Qaidam block moved along the Altyn fault at least for 1000 km to the east. The data also proves a clockwise rotation of the sampling area in the Qaidam block with respect to the Tarim block since the Late Carboniferous. Finally, a new version of reconstruction of the Chinese blocks (north and south China, Tarim, Qaidam, Kunlun and Lhasa blocks) is given.