青藏高原羌塘中部冈玛日—菊花山地区大型逆冲推覆构造的基本特征及形成机制

青藏高原羌塘中部冈玛日地区发现冈玛日-菊花山大型新生代逆冲推覆构造,延伸长度超过200km,总体走向近东西,构成新生代戈木错盆地的北部主干边界。推覆构造在冈玛日一带出露最好,表现为一系列单冲型逆冲断层构成的叠瓦状构造,逆冲断面倾向北,倾角12～20°,逆冲方向190～200°。冈玛日-菊花山逆冲推覆构造的发现,对探讨高原隆升在羌塘地区的表现形式具有重要的科学意义,为探讨新生代戈木错盆地的演化和盆地油气资源远景评价提供了新的构造依据。

Gangmari-Juhuashan thrust nappe were discovered in central Qiangtang, northern Tibet, China

Recently, large Cenozoic Gangmari-Juhuashan thrust structure were discovered at the Gangmari area in central Qiangtang, Qinghai-Tibet Plateau, extending more then 200km in length, whose general strike is nearly EW. It constitutes main boundary of the northern Cenozoic Gemucuo basin. The best outcrop is at gangmari, showing imbricate structure formed by a series of single-impulse-type thrust fault. The dip of inverse transversals is N and inclination is 12~20°. The thrust direction is 190~200°. The discovery of the Gangmari-Juhuashan thrust structure provides significant new structure data for the evolution of the Cenozoic Gemucuo basin and petroleum resources assessment of the basin, which is great significance to research the manifestation of plateau uplift in Qiangtang.