On Disintegration of Qi'eshan Group and Its Definition of Lithostratigraphic Units from Kumutag Sand-Ridge Area in the Eastern Tianshan
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摘要: 东天山企鹅山群的组级岩石地层单位厘定争议已久.1∶5万区域地质矿产调查, 于库姆塔格沙垄地区企鹅山群中的两套碳酸盐岩中, 分别发现了牙形刺Streptognathodus suberectus, Idiognathoides sinuata和珊瑚Pelalaxis intermedia, Lithostrotionella rarivesicula, Fomichevella kiaeri, 确认其时代分属晚石炭世罗苏阶-达拉阶和达拉阶-小独山阶, 分别重新厘定为底坎尔组和脐山组.由该两组沉积地层隔离的两套火山岩, 空间上分布相对固定, 岩石组合特征明显, 野外极易识别和区别, 大区易于对比, 且分属早石炭世和晚石炭世.库姆塔格沙垄地区企鹅山群可进一步解体并由老到新厘定为小热泉子组、底坎尔组、企鹅山组和脐山组等4个组级岩石地层单位.Abstract: The debate of the definition of lithostratigraphic units in formation scale in eastern Tianshan was presented long before.During 1∶50000 regional geology and mineral survey, some conodonts fossils such as Streptognathodus suberectus, Idiognathoides sinuate etc.and coral fossils such as Pelalaxis intermedia, Lithostrotionella rarivesicula, Fomichevella kiaeri were discovered in the two limestones of the Qi'eshan Group from Kumutag sand-rigde.The age of conodont fossils within the stratum was determined as the Upper Carboniferous Luosu Stage-Dalaan Stage, and the age of coral fossils within the stratum was confirmed as the Dalaan Stage-Xiaodushan Stage.Therefore, they belong to Dikan'er Formation and Qishan Formation.The two volcanic rocks separated by two sedimentary rocks have some characteristics such as regular distribution in space, diagnostic rock association, distinguishable in field geolgy and comparable in study area.And their ages are Early Carboniferous and Late Carboniferous respectively.Therefore, the Qi'eshan Group can be further divided into four lithostratigraphic units according to formation scale from early to late, which are Xiaorequanzi Formation, Dikan'er Formation, Qi'eshan Formation and Qishan Formation.
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图 1 东天山库姆塔格沙垄地区地质简图(据1∶5万库姆塔格沙垄幅改编)
1.现代沙垄; 2.第四系戈壁; 3.侏罗系; 4.脐山组; 5.企鹅山组; 6.底坎尔组; 7.小热泉子组; 8.梧桐窝子岩组; 9.干墩岩组; 10.雅满苏组; 11.闪长岩; 12.哈尔里克岩体; 13.赤湖岩体; 14.石炭系企鹅山群; 15.糜棱岩; 16.康古尔塔格深大断裂带; 17.化石点; 18.剖面位置及编号; 19.地质界线; 20.研究区
Fig. 1. Geological sketch map of the Kumutag sand-ridge region in the eastern Tianshan
图 2 东天山哈尔里克地层小区石炭系划分与对比
Fig. 2. The division and comparison of Carboniferous in Harike minor strata area in eastern Tianshan
图 3 库姆塔格沙垄地区碳酸盐岩夹碎屑岩剖面图(A: ①-①剖面, B: ②-②'剖面, C: ③-③'剖面)
1.砾岩; 2.砂岩; 3.石英砂岩; 4.钙质粉砂岩; 5.灰岩; 6.泥质灰岩; 7.生物碎屑灰岩; 8.粉砂质灰岩; 9.碳酸盐化; l0.石英脉; 11.化石点; 12.碎裂石英岩; 13.断层
Fig. 3. Sections of the interbed of detrial rock within carbonate rocks in the Kumutag sand-ridge region
图 4 库姆塔格沙垄地区火山岩剖面图(A: ④-④'剖面, B: ⑤-⑤'剖面, C-1和C-2:⑥-⑥剖面)
1.第四系; 2.硅质岩; 3.火山角砾岩; 4.凝灰岩; 5.细碧岩; 6.角斑岩; 7.石英角斑岩; 8.玄武岩; 9.安山岩; 10.辉长岩; 11.闪长岩; 12.花岗闪长岩; 13.斜长花岗斑岩; 14.岩屑; 15.蚀变; 16.角岩; 17.石英脉
Fig. 4. Sections of the volcanic rocks of the Kumutag sand-ridge region
表 1 东天山哈尔里克地层小区石炭系岩石地层单位特征对比
Table 1. The characteristics and comparison of Carboniferous in Harike minor strata area in eastern Tianshan
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