| 张志平,雒晓刚,刘伯崇,武雪梅,戴蕊.西藏改则县物玛乡一带多尼组地层特征、形成时代及沉积环境[J].矿产勘查,2019,(6):1316-1326 |
| 西藏改则县物玛乡一带多尼组地层特征、形成时代及沉积环境 |
| Stratigraphic characteristics, formation age and sedimentary environment of the Duoni formation in Wuma Township, Gaize county, Tibet. |
| 投稿时间：2019-01-10 |
| DOI： |
| 中文关键词: 物玛乡 地层特征 沉积环境 形成时代 多尼组 |
| 英文关键词: Wuma township, stratigraphic characteristics, sedimentary environment, formation age, Duoni formation |
| 基金项目:中国地质调查局项目(编号:1212011221089)资助。 |
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| 中文摘要: |
| 在冈底斯带北缘分布着一套滨-浅海相碎屑岩-碳酸盐岩-火山岩建造地层,该地层对于研究特提斯洋的演化历史,认识特提斯构造域的演化和理解整个青藏高原的形成过程有着重要的作用。但由于缺少古生物化石等资料,前人对冈底斯北缘改则县物玛乡一带分布的这套地层归属不统一。本文通过野外调查,在岩石学、沉积学研究基础上,通过古生物化石、同位素年龄等,将该套地层厘定为多尼组,时代为早白垩世晚期,代表在弧后盆地内陆海的台地边缘浅滩-浅海陆棚环境下形成的碎屑岩、碳酸盐岩、火山岩组合,表明改则县物玛乡一带在早白垩世晚期处于新特提斯洋对冈-念板片南向俯冲的残留海盆地阶段。以上研究为新特提斯海的演化及青藏高原的形成演变历史提供了新的资料。 |
| 英文摘要: |
| A set of littoral-shallow marine clastic rocks-carbonate rocks- volcanic rock formations are distributed in the northern margin of the Gangdise belt. This formation plays an important role in studying the evolution history of the Tethyan Ocean, understanding the evolution of the Tethyan tectonic domain and the formation process of the entire Qinghai-Tibet Plateau. The predecessors have different attributions to the strata distributed in the area of Wuma Township, due to the lack of paleontological and fossil data. This set of strata is classified as the Duoni Formation, yielding a late Early Cretaceous, on the basis of petrology and sedimentology, paleontological fossils and isotope ages. It representing the clastic rock, carbonate rock and volcanic rock assemblages formed in the shoal-shallow shelf environment of the platform margin of the inland sea of the back-arc basin, indicating that the area of Gaize County located in the early Cretaceous. It was a residual Sea basin subducted southward by the New Tethyan Ocean to the Gangnan Plate in Late Cretaceous. These studies provide new data for the study of the evolution of the Tethys Sea and the formation and evolution of the Qinghai-Tibet Plateau. |
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