摘要
略阳组分布于南秦岭勉略缝合带附近,是略阳地区重要的岩石地层单元。本次研究在略阳灵岩寺南部剖面的略阳组获得牙形刺13枚,共识别出3属5种,包含2亚种和2未定种,分别为:Siphonodella homosimplex,Polygnathus communis communis,Po.inornatus inornatus,Po. sp.和Pseudopolygnathus sp.。该牙形刺组合可以与华南同时期牙形刺进行对比,时代为早石炭世杜内期早期,这为确定略阳组的下部层位的具体时代提供了新的牙形刺证据。略阳组中所产出的Si.homosimplex为华南地区浅水相牙形刺的典型代表,Po.inornatus inornatus广泛见于西欧的浅水相地层,这表明在早石炭世期间勉略地区为浅水碳酸盐岩台地沉积环境,且与华南地区生物区系存在紧密联系,同前人根据底栖生物化石研究得出的结论相一致。
The carbonate-dominated and fossiliferous Lueyang Formation is stratigraphically important for the Mian-xian—Lueyang area, Shaanxi Province, which is located in the middle part of the Central Orogenic Belt in China. Thirteen conodont specimens have been obtained from the Lueyang Formation at the South Lingyan temple section. Five species belonging to three genera(including two subspecies and two indeterminate species) are present. This conodont fauna is composed of Siphonodella homosimplex, Polygnathus communis communis, Po. inornatus inornatus, Po. sp. and Pseudopolygnahtus sp.. The Lueyang fauna can be biostratigraphically correlated with the earliest Carboniferous stratigraphic sections in South China, suggesting an early Touranisian age of the Early Carboniferous. This condont biostratigraphy provides age dating of the lower part of the Lueyang Formation. The most stratigraphically important Si. homosimplex yielded in the Lueyang Formation characterizes a typical shallow-water setting in south China, while the other age-diagnostic taxon in the Lueyang conodont assemblage, Po. inornatus innornatus, has been widely reported from the shallow-water carbonates of West Europe. All these suggest that the Lueyang area was located on a shallow water carbonate platform and had a close relation with the South China Bioprovince during the Early Carboniferous. This result is consistent with previous conclusions drawn based on benthic fossil groups.
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