The discovery of Early Cretaceous Hauterivian Ammonite Fauna in Bange area, northern Tibet and its constraints on the stratigraphic correlation of the Lower Cretaceous
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摘要:
在藏北班戈地区多尼组中发现了早白垩世欧特里夫期菊石。这些菊石化石部分保存较完整，鉴定出2科和1种(比较种)，包括多皱菊石科Polyptychitidae，新考米菊石科Neocomitidae，减退菊石比较种Lyticoceras cf.stevrecensis。对比发现，该化石组合可能具有较强的地方属性特征。其中，Lyticoceras cf.stevrecensis属于地方菊石亚科，是早欧特里夫期的典型分子，可以与特提斯域的喜马拉雅北部、巴基斯坦北部和西地中海等地区的菊石进行对比，填补了班戈地区Thurmanniceras - Sarasinella菊石组合的欧特里夫期空白，这对于该地区的下白垩统地层对比和重新认识措勤盆地的沉积构造演化可能具有重要的约束作用和指示意义。
Abstract:Recently, ammonites have been discovered in the Bange area of northern Tibet, which of the age is Early Cretaceous Hauterivian.The ammonite assemblages sampled in the Duoni Formation are of good preservation.Two families and one comparative species have been identified, including Polyptychitidae, Neocomitidae, Lyticoceras cf.Stevrecensis.By comparison and analysis with early studies, the ammonites have strong local attribute characteristics.Lyticoceras cf.stevrecensis is the typical species of the Early Hauterivian, which belongs to the subfamily Endemoceratinae, and can be compared with those faunas from the Northern Himalayas, Northern Pakistan and Western Mediterranean(South-East France)around the Tethys realm, even the North-Eastern Peri-Tethys.The discovery of ammonites extends the epoch of Thurmanniceras - Sarasinella to Early Hauterivian.These findings could be important foundations for the stratigraphic correlation study of the Lower Cretaceous, and for re-recognizing the sedimentary tectonic evolution in this area of Cuoqin Basin.
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Key words:
- ammonites /
- Hauterivian /
- Early Cretaceous /
- Bange area /
- Cuoqin basin /
- geological survey engineering /
- Tibet
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