• 责任者：Wang Bingzhang (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Luo Zhaohua
• 刊名：Geological Bulletin of China
• 出版年：2012
• 卷期：31（6）
• 关键词：拉斑玄武岩 ; tholeiitic basalt ; 玄武安山岩 ; basaltic andesite ; 青藏高原 ; Qinghai-Tibetan Plateau
• 页码：p.860-874
• 图表：8 illus., 5 tables, 21 refs.
• 分类号：0801
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

///A study of the Early Paleozoic volcanic rocks in Qimantag area reveals that they were formed in the Middle-Late Ordovician period. The volcanic rocks can be assigned to four volcanic rock belts, i.e., Gonglugou-luanshigou belt, Kuangou-Xiaolangyashan belt, Bayan Gol-Suhait belt and Naling Gol belt. U-Pb LA-ICPMS analyses of zircons in basalt and lithoidite yielded the data of (440.2±2.4) Ma and (450.3±1.2) Ma, respectively. The content of TiO₂（1.1%） and K₂O（0.14%） is low while that of Na₂O（2.17%） is high for the rocks of the tholeiite combinations in the third belt. Although the content of TiO₂（1.64%） is relatively high, the tholeiite combinations in the fourth belt are very similar to those in the third belt.