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,博格达一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。
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 Cxmozoic (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.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2006年第1期16-22,共7页
Acta Geologica Sinica
基金
国家重点基础发展规划项目(编号2001CB409804)
国家自然科学基金项目(编号40372092)资助成果