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对辽东海城地区的炒铁河辉长岩侵入体的锆石SHRIMP U-Pb定年结果表明,该辉长岩侵位年龄为(126±4)Ma,说明它形成于早白垩世华北克拉通岩石圈大规模减薄背景下,而不是长期认识的形成于古元古代裂谷环境.该辉长岩体含有大量的年龄为古元古代(2.10~2.4和~1.87Ga)和新元古代(747~969Ma)的老锆石,前者可能来源于华北地块本身,而后者则可能来自俯冲到华北之下的扬子地块.这些年龄信息对认识中生代华北地壳的演化具重要启示意义.
The zircon SHRIMP U-Pb dating of the Gaotiehe gabbro intrusive in the Haicheng area of Liaodong shows that the gabbro emplacement age is (126 ± 4) Ma, indicating that it was formed during the Early Cretaceous North China Craton Instead of long-term understanding of the ancient Paleogene rifting environment, the gabbro contains a large number of ancient Paleozoic (2.10 ~ 2.4 and ~ 1.87Ga) and Neoproterozoic 747 ~ 969Ma), the former may originate from the North China block itself, while the latter may come from the subducted Yangtze block below North China.These age information are of great significance for understanding the evolution of the Mesozoic crust in North China.