新疆北部泥盆纪放射虫及其岩相分布和环境意义

Devonian Radiolaria from northern Xinjiang and their distribution and sedimentary environment significance

我国放射虫研究起步较晚,虽然中、新生代放射虫研究已有一个良好的开端,但古生代放射虫的研究尚是有待进一步开拓的研究领域。本文有关新疆北部泥盆系放射虫资料绝大部分均为首次报道。 一、放射虫的产地、层位和赋存岩性:本区放射虫广泛发育于东、西准噶尔地区,在泥盆系下、中、上统均有分布,累计达79个层位。其中,东准噶尔下泥盆统9个层位、中泥盆统4个层位及上泥盆统30个层位;纸房中泥盆统2个层位及上泥盆统1个层位;

Radiolaria from the Lower, Middle and Upper Devonian rocks in northern Xinjiang, most of which were firsly found, are reported in this paper.The chief taxa include Entacti-nosfhaera sp., E. esostrongyla, E. palimbola, E. euthlasta, Entactinia additiva, E. sp. 1, E. sp. 2, Sphaerazoum sp., Helioentactinia perjucunda, Aitroentactinia (?) cf. paronae, Tlecce-rina(?) horrida, Spongodiscus cribrarius, S. sp. and Cenosphaera affinis. They are distributed in the tempestites, turbidites, tuffs, and silicalites indicating neritic, bathyal and abyssal environments. The radiolaria distributions are mainly controlled by water depth, sedimentary rate, water mass feature and volcanic activity. 5-10% of radiolaria in the rocks can be used as indicator for distinguishing shallow water environments (≤200m) from deep water environments(>200m).