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陕西渭北地区晚奥陶世裂陷成深水环境,构成北秦岭弧后盆地的一部分,接受了一套碳酸盐岩斜坡相沉积。在其下部地层首次分离出一个保存良好,属种丰富的放射虫化石组合Inanibigutta aff.inconstans-Syntagentactinia biocculosa组合,计有7科、14属、23种、4新种,以Inaniguttidae、Haplentactiniidae、Polyentactiniinae为特征,与哈萨克斯坦放射虫组合面貌一致,不存在澳洲和美洲的Kalimnasphaera等分子,就目前所知亚洲这一地区是全球奥陶纪放射虫分异度最高的地区,反映了北秦岭古海洋与古亚洲洋是相通的。
The Late Ordovician rift in the Weibei area of Shaanxi developed into a deep-water environment, forming part of the North Qinling back-arc basin and receiving a set of carbonate ramp facies deposits. For the first time, a well-preserved and genera rich combination of Inanibigutta aff.inconstans-Syntagentactinia biocculosa was isolated in the lower stratum, with 7 families, 14 genera, 23 species and 4 new species. Inaniguttidae, Haplentactiniidae and Polyentactinainae were Characteristics, consistent with the combination of Kazakhstan’s radioactive insects, the absence of molecules such as Kalimnasphaera Australia and the Americas, as far as this region is known Asia is the highest Ordovician radioactive isotope differentiation in the world, reflecting the ancient Qinling North Sea and The ancient Asian Ocean is interlinked.