伊朗晚元古代──早古生代古地磁研究

选择伊朗中部、南部及西北部地区的近２０条晚元古代－早古生代完整地层剖面，系统采集Ｓｏｌｔａｎｉｅｈ组、Ｂａｒｕｔ组、Ｚａｉｇｕｎ组、Ｌａｌｕｎ组及Ｍｉｌａ组古地磁样品９６０件．经测试和对比获得结论：Ｓｏｌｔａｎｉｅｈ组记录的地磁极性带为反向，Ｂａｒｕｔ组－Ｌａｌｕｎ组为正向，Ｍｉｌａ组又为反向．此成果完全可与国际地质科学联合会（ＩＵＯＳ）１９８９年建立的全球地层极性柱中相应时代的极性带对比．计算得出５个地层组的古地磁南极位置．古地磁研究表明，晚元古代－早古生代伊朗全境均属稳定地块，处于赤道南侧约１６°的低纬度区．此期间似无大幅度转动和纬度变化．

PALEOMAGNETIC INVESTIGATION ON TERMINAL PROTEROZOIC─EARLY PALEOZOIC IN IRAN

Twenty continuous stratigraphic sections of Terminal Proterozoic-Early Paleozoic scattered in central, southern and northern Iran separatelly have been selected for paleomagnetic investigation. We drilled up 960 samples of paleomagnetic test in Soltanieh, Barut, Zaigun, Lalun and Mila Formations. The following important conclusions are obtained after detail determination: The geomagnetic polar sone recorded in Soltanieh Formation is mainly reverse with one third of nuclear, Barut Lalun Formation is mainly normal, and Mila Formation is reverse too. The results have been definitelly compared with the magneto-stratigraphic chart in Global Stratigraphic Chart provided by IUGS. The paleomagnetic setting of southern pole forfive Formations are got by using computer treatment. This paleomagnetic investigation indicates that Iranian territory during the Terminal Proterozoic-Early Paleozoic should belong to the stable block, and sitted on lower latitude area, southern of equator with 16 degree. The big range of turning and change of latitude for Iranian block didn't found during that age.