天山、西昆仑山中、新生代幕式活动的磷灰石裂变径迹记录

Apatite fission-track records of Mesozoic and Cenozoic episodic reactivation of the Tianshan and West Kunlun Mountains

通过对天山独山子—库车公路、西昆仑山新疆—西藏公路出露的7个花岗岩样品的磷灰石裂变径迹分析，研究了天山、西昆仑山脉低温（＜110℃）热历史。磷灰石裂变径迹年龄范围为（9.6±0.8）～（89.2±2.3）Ma，平均裂变径迹长度变化范围为（7.9±3.7）～（11.6±1.9）μm。磷灰石裂变径迹年龄反映冷却作用时代，地质资料和磷灰石裂变径迹分析数据表明，天山在白垩纪存在一次抬升作用，天山和西昆仑山在中新世发生另一次抬升作用。

：The low-temperature （i．e.＜110℃） thermal history of the Tianshan and West Kunlun Mountains has been studied by apatite fission track analysis of 7 granite outcrop samples.Fission-track ages for these samples range from 9．6±0．8 to 89．2±2．3 Ma with mean track lengths varying from 7．9±3．7 to 11．6±1．9 μm.The apatite fission track ages from various geographical regions suggest difference in styles of cooling during the Mesozoic－Cenozoic.The geological and apatite fission-track data from the Tianshan and West Kunlun indicate that there occurred an uplift the Tianshan in the Cretaceous and another uplift in the Tianshan and West Kunlun in the Miocene．