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羊卓绒错混杂岩是一条长达2 000 km的构造破碎岩带,出露于西藏南部雅鲁藏布江缝合带以南.该缝合带于新生代欧亚碰撞后闭合,记录了特提斯海洋中的残留部分.混杂岩发育于印度板块北部大陆边缘与其以北地体的一次大的碰撞事件中.这次碰撞到底是欧亚碰撞的主事件还是一次早期碰撞事件尚不确定.由于混杂岩是碰撞期间地层不断破碎而形成的,因此地层中的任何岩石古生物学资料对于确定混杂岩的成因及形成时代是有意义的.该混杂岩中发育大量的放射虫硅质岩和燧石,它们可以提供大量的古生物学证据.文中所描述的提索期放射虫,采自于江孜县白洒村附近的一个原地岩块.为典型的东特提斯属种,可与西特提斯的属种对比,其中大部分属种为主要属种,有稳定的地层时限分布,如:Archaeodictyomitra apiarium(Rust),Archaeodictyomitra minoensis(Mizutani), Archaeodictyomitra patricki Jud,Eucyrtidiellium pyramis(Atta),和Protunuma japonicus Matsuoka &Yao,它们分别对应于在西特提斯所建立起来的“统一组合区带”(Unitary Association Zone)的8—22,9—12,13—22,12—13,7—12区带,尤其是后4个放射虫种,有非常短的地层分布,能够将地层年代确定得非常具体.这对于西藏广泛分布的海相含放射虫岩石地层来说,是一个非常有效的?
The sheep Zhuozhuo meso-melange is a tectonic crushed rock belt up to 2 000 km exposed south of the Yarlung Zangbo suture in southern Tibet, which closed after Cenozoic Eurasian collision and recorded The remnant, the melange, developed during a major collision between the northern continental margin of the northern continental margin of the Indian plate and whether the collision was a major event in the Eurasian collision or an early collision event.As the melange is a collision Therefore, any paleopathic data of the rocks in the stratigraphy is of great significance in determining the genesis and formation age of the melanges.A large amount of radiolammonium chert and chert are developed in the melange, which can provide a large amount of Of the paleobiology evidence described in the article period of radiolarian period, collected from a spar in the vicinity of Bai sprinkler village in Gyangze County is a typical Eastern Tethys genus, In contrast, most of the genera are major genera and have stable stratigraphic time-lapse distributions such as Archaeodictyomitra apiarium (Rust), Archaeodictyomitra minoensis (Mizutani), Archaeodictyomitra patricki Jud , Eucyrtidium pyramis (Atta), and Protunuma japonicus Matsuoka & Yao, which correspond to 8-22, 9-12, 13-22, respectively, of the Unitary Association Zone established by Sit Tiet, The 12-13, 7-12 zone, especially the last 4 radioactive insects, have a very short stratigraphic distribution that allows for very specific dating of the stratigraphy, which is particularly relevant for the widespread marine-lacustrine radioactive rock formations in Tibet Is it a very effective?