摘要:
通过精细的生物地层学工作 ,从时代和生物群组合入手 ,重新厘定了志留 -泥盆系各时期的岩石地层单位时序 ,在卡拉麦里碰撞带南缘建立较为合理的地层序列.研究认为 ,该区中 -上志留统白山包组第一段可建立扭图瓦贝(Tuvaestrophia sp .)-薄扭贝(Leptostrophia sp .)-原始戟贝(Protochonetes sp .)生物群组合 ,第二段可建立大型图瓦贝(Tuvaella gigantea Tschernyschew)-近平无洞贝(相似种)(Atrypa cf .depressa Zhang)-盖嘴贝(Stegerhynchus sp .)生物群组合 ,第三段可建立大型图瓦贝(Tuvaella gigantea Tschernyschew )-拉氏图瓦贝(Tuvaella rackovskii Tschernyschew)-扁平薄皱贝(Leptaena cf .depressa)-新疆高面石燕(Tannuspirifer xin-jiangensis Zhang)生物群组合.上志留统老沟组可建立小鸽小无洞贝(Atrypellacf .columbellaBarrande)-单褶准无窗贝(Athyrisinacf .uniplicataGrabau)-安嘎西盖嘴贝(Stegerhynchus angaciensis Tschernyschew)生物群组合.顶志留统 -下泥盆统红柳沟组可建立肥厚灌木孔珊瑚(Steatothamnopora sp .)-沟孔珊瑚(Striatopora sp .)-拟灌木孔珊瑚(Parathamnopora sp .)动物群组合 ,下 -中泥盆统卡拉麦里组可建立中华薄腔贝(相似种) (Leptocoeliacf .sinicaSu)-肠状珊瑚(未定种)(Enterolasma sp .)-双锥珊瑚(未定种)(Diplochone sp .)动物群组合 ,上泥盆统克安库都克组出现先鳞木(未定种)(Prelepidondron sp .).志留 -泥盆系生物地层单位时序的建立 ,对研究卡拉麦里碰撞带及志留-泥盆系地层具有重要作用.
Abstract:
Based on the precise biostratigraphic work and combined with fossil biota and their geological periods ,it is redefined the sequence in Silurian-Devonian lithostratigraphic units in the southern margin of Kalamaili collision zone ,east Junggar .The result shows that the assemblages of fossil biota in the first section of the Baishanbao Formation in middle-upper Silurian can be established as Tuvaestrophia sp .-Leptostrophia sp .-Protochonetes sp , the second and third sections can be established as Tuvaella gigantea Tschernyschew--Atrypa cf . depressa Zhang-Stegerhynchus sp . and Tuvaella gigantea Tschernyschew- Tuvaella rackovskii Tschernyschew-Leptaena cf .depressa-Tannuspirifer xinjiangensis Zhang .,respectively .The assemblages of fossil biota of the Laogou Formation in upper Silurian can be es-tablished as Atrypellacf .columbellaBarrande-Athyrisina cf .uniplicataGrabau-Stegerhynchus anga-ciensis Tschernyschew ,the Hongliugou Formation in lower Devonian can be established as Steatothamno-pora sp .- Striatopora sp .- Parathamnopora sp .and Kalamaili Formation of lower-middle Devonian is established as Leptocoelia cf .sinica Su- Enterolasma sp .- Diplochone sp .In addition , Prelepidondron sp .is discovered in Keankuduke Formation in upper Devonian . The establishment of biological strati-graphic units in Silurian-Devonian in this area is important to study the Silurian-Devonian biostratigraphy in Kalamaili collision zone .
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