“塔里木—扬子古大陆”的重建对油气勘探的意义

板块边缘造山带的岩石学记录追踪了扬子与塔里木古板块地史演化中的相关性,从岩石学、古气候学和古生物学等方面论证了扬子与塔里木古板块内部地质特征的可比性。研究结果表明,从新元古代至二叠纪,扬子古板块与塔里木古板块靠近,成为一个大陆,称为"塔里木—扬子古大陆"。后经"峨眉地幔柱"的作用和"峨眉地裂运动"的拉张,古大陆解体,两板块分离,扬子古板块向东漂移1900km至现今位置。若"塔里木—扬子古大陆"重建模式成立,则对大型油气藏勘探具有重要意义。

Importance of reconstruction of Tarim-Yangtze Paleocontinent model to oil-gas exploration

The correlation of evolutions between Yangtze paleo plate and Tarim paleo plate was analyzed using the petrology of orogenic belt in the edge of plate.The comparability of intra geological characteristics of Yangtze paleo plate and Tarim paleo plate was discussed according to the petrology,paleoclimatology and paleontology.The study results showed that the Yangtze paleo plate was close to Tarim paleo plate from the Neoproterozoic to the Permian and became a paleo continent named Tarim Yangtze Paleocontinent.Under the action of “Emei mantle plume” and the extension of “Emei Taphrogeny”,the Tarim Yangtze paleocontinent diverged and separated.The Yangtze paleo plate moved about 1900 kilometers from west to east and located in present position.If the model about reconstruction of Tarim Yangtze Paleocontinent is true,it will be important to forecast giant mineral resources.