西藏昌都诺玛村剖面泥盆石炭系地层柱状图

西藏东部昌都地区自类乌齐县向东至江达县一线的晚古生代碳酸盐岩地层发育较好。前人对这一地区泥盆-石炭系地层进行了初步的生物地层学研究。作为依据的腕足类、珊瑚等大化石虽然较为丰富，但分辨率和精度较低。以妥坝乡和乌青纳村附近地层为例，包括泥盆系上部的卓戈洞组以及石炭系下部的乌青纳组等。本次科考对昌都市卡若区妥坝乡诺玛村附近的碳酸盐岩地层进行了详细的牙形刺和沉积、地化采样工作，这段地层据内部地质调查资料属于泥盆系至石炭系跨界线地层，这项研究对于提高这一地区生物地层对比精度以及全球泥盆石炭系界线层型研究具有潜在意义。目前仅提供基于野外描述的剖面地层柱状图和照片，根据牙形刺生物地层资料，大致可将泥盆-石炭系界线确定在该剖面141m至188m之间。

The Late Paleozoic carbonate strata along the transect from Ziqü County eastward to Jomda County in Qamdo area, eastern Tibet, are well-developed. Previous studies have conducted preliminary biostratigraphic research on the Devonian-Carboniferous strata in this region. Although large fossils such as brachiopods and corals used as evidentiary materials are relatively abundant, their resolution and precision are relatively low. Taking the strata near Tuoba Township and Wuqingna Village as examples, they include the Upper Devonian Zhuogedong Formation and the Lower Carboniferous Wuqingna Formation, among others. This field investigation carried out detailed conodont, sedimentological and geochemical sampling on the carbonate strata near Nuoma Village, Tuoba Township, Karuo District, Qamdo City. According to internal geological survey data, this stratigraphic section belongs to the Devonian-Carboniferous boundary-crossing strata. This study has potential significance for improving the precision of biostratigraphic correlation in this area and advancing global Devonian-Carboniferous boundary stratotype research. Currently, only profile stratigraphic columns and photos based on field descriptions are provided. Based on conodont biostratigraphic data, the Devonian-Carboniferous boundary can be roughly constrained between 141 m and 188 m of this section.