【摘要】 在进行1∶25万岔路口幅康西瓦南部甜水湖一带地质填图和实测地层剖面的过程中,在原划奥陶系冬瓜山组中采到了大量腕足、珊瑚类化石,经鉴定其形成时代为中泥盆世早期,并发现该地层与下伏下志留统温泉沟群呈微角度不整合接触。该不整合界面的发现充分证实甜水海微陆块经历过早古生代运动,说明该微陆块与扬子陆块具有相似的演化历史,二者具有明显的亲缘关系,为进一步探讨南、北古大陆边界提供了基础资料。更多还原

【Abstract】 Many brachiopod and coral fossils were collected from the Dongguashan Formation which was originally assigned to the Ordovician when geological mapping and stratigraphic section measurements of the 1∶250000 Chalukou Sheet were performed in the Tianshuihu area, southern Kangxiwar. These fossils were identified to be of early Middle Devonian age. In addition, a very low-angle unconformity was found between the studied strata and the underlying Lower Silurian Wenquangou Group. The discovery of the unconformity has fully demonstrated that the Tianshuihai micromassif underwent Early Paleozoic movement, indicating that the micromassif and the Yangtze block have a similar evolution history and pronounced affinity. This provides basic data for the further study of the northern and southern paleocontinents.更多还原