【摘要】 对新疆博格达—哈尔里克山火山岩和花岗岩的15个磷灰石样品和5个锆石样品的裂变径迹年龄测定表明,磷灰石的裂变径迹年龄变化于109.3~11.9Ma之间,锆石的裂变径迹年龄变化于81.7~56.8Ma之间。矿物对法计算得到,该地区晚白垩世至新生代中期的视剥露速率为0.157~0.222mm/a。热史模拟结果表明,博格达—哈尔里克山自白垩纪以来经历了多期冷却剥露,分别是早白垩世(119~105Ma)、晚白垩世晚期(67~65Ma)、新生代早中期(47~31Ma)和新生代晚期(12~7Ma)。白垩纪以来的天山变形作用,与亚洲南缘多期的地体碰撞增生有关。更多还原

【Abstract】 Fifteen apatite samples and five zircon samples from volcanic rocks and granites in Bogda— Harlik mountains were analysed. The apatite ages range from 109.3 to 11.9Ma and the zircon ages are within the range 81.7～56.8 Ma. Results of calculation by paired-minerals indicate that the apparent exhumation rates range from 0.157 mm/a to 0.222 mm/a during the Late Cretaceous to Middle Cenozoic in above area. The thermal history modeled result shows four periods of exhumation in Bogda—Harlik mountains occurred in Early Cretaceous (119～105 Ma)、late Late Cretaceous (67～65 Ma)、Early—Middle Cenozoic (47～31 Ma) and Late Cenozoic (12～7 Ma) since Cretaceous. The deformation in Tianshan regions since Cretaceous is related to the multi-stage collisions and accretions of terranes with the south Asian continental margin.更多还原