新疆东准卡拉麦里碰撞带南缘志留-泥盆系生物地层研究新进展-《资源调查与环境》

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作者:: 蔡雄飞1; 王富明2; 廖群安1; 樊光明1; (1中国地质大学生物地质与环境地质国家重点实验室,中国地质大学地球科学学院,武汉430074)

关键词:: 新疆; 东准噶尔; 卡拉麦里碰撞带; 志留-泥盆系; 生物地层; 化石生物群; 时序新疆东准卡拉麦里碰撞带是国内重大基础理论研究的热点之一; 尤其碰撞带时限问题存在不同观点[1-5]。长期以来该地区一直存在“构造热”; 对地层的研究却十分滞后; 尤其对志留-泥盆系地层研究更少; 对泥盆地层的研究更是从未涉及。卡拉麦里碰撞带南缘志留系由白山包组由老沟组（新建）组成; 泥盆系红柳沟组; 泥盆下中统卡拉麦里组泥盆上统克安库都克组组成。

Keywords:: Xinjiang; east Junggar; Kalamaili collision zone; Silurian-Devonian; biostratigraphy; fossil biota; sequence

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，厘定了志留-泥盆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 xinjiangensis Zhang）生物群组合上志留统老沟组小鸽无洞贝Atrypella cf. columbella Barrande）-单褶准无窗贝Athyrisina cf. uniplicata Grabau） -安嘎西盖嘴贝tegerhynchus angaciensis Tschernyschew）生物群组合下泥盆统红柳沟组动物群组合，下中卡拉麦里组）动物群组合，上统克安库都克组出现Prelepidondron sp.）。志留-泥盆地层单位时序建立，对卡拉麦里碰撞带志留-泥盆具有。

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 southern margin of the 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 established as Atrypella cf. columbella Barrande- Athyrisina cf. uniplicata Grabau - Stegerhynchus angaciensis Tschernyschew, the Hongliugou Formation in lower Devonian can be established as Steatothamnopora 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 stratigraphic units in Silurian-Devonian in this area is important to study the Silurian-Devonian biostratigraphy in Kalamaili collision zone