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首页> 外文期刊>Journal of Asian earth sciences >Thermochronology of the highest central Asian massifs (Khan Tengri - Pobedi, SE Kyrgyztan): Evidence for Late Miocene (ca. 8 Ma) reactivation of Permian faults and insights into building the Tian Shan
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Thermochronology of the highest central Asian massifs (Khan Tengri - Pobedi, SE Kyrgyztan): Evidence for Late Miocene (ca. 8 Ma) reactivation of Permian faults and insights into building the Tian Shan

机译：最高中亚地块的热量学（Khan Tengri - Pobedi，Se Kygyztan）：后期内科（CA.8 MA）重新激活二叠纪缺失和洞察建设天山的证据

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摘要

Geological study of the Khan Tengri and Pobedi massifs highlights two phases of compressional fault displacements. A Late Permian/Triassic displacement phase is highlighted (1) by biotite Ar-40/Ar-39 ages of 265-256 Ma, suggestive of cooling of Pobedi mid-crustal granulites during 8 km of top-to-the-north motion of the Pobedi Thrust; (2) by Ar-40/Ar-39 dating of syn-kinematic phengite at 249-248 Ma, which suggests a crystallization age during top-to-the-south motion of the Khan Tengri Thrust shear zone; (3) by Apatite Helium (AHe) ages of 280-240 Ma on the crystalline basement below the Mesozoic peneplain, which gives insight into the final exhumation stage. Cenozoic reactivation of the Pobedi Thrust is indicated by AHe thermochronology with a mean age of 8.3 +/- 2.5 Ma, in agreement with similar to 3 km exhumation and similar to 4.2 km of top-to-the-north motion in the Late Miocene. Along a north-south transect of the west Tian Shan range from Issyk-Kul Lake to Tarim Basin, compiled thermochronological data outline out-of-sequence deformation beginning with the activation of north-directed crustal-scale faults at 22-15 Ma along the northern margin of the north Tian Shan, followed by 20-10 Ma motion at the boundary between the Middle and the South Tian Shan, and ending with the 10 Ma reactivation of the Pobedi Thrust in the South Tian Shan. This latter coincided with south-directed motion on the South Tian Shan Front (the Maidan Fault) and fold and thrust belt propagation towards the Tarim Basin.
机译：Khan Tengri和Pobedi Massifs的地质研究突出了两阶段压缩断层位移。通过Biotite Ar-40 / Ar-39岁突出显示（1）突出显示的后期二叠态/三叠纪位移阶段，暗示在距离北方运动的8千米的北方运动期间施用袋中的中外颗粒体pobedi推力; （2）通过AR-40 / AR-39在249-248 mA的Syn-kinematic Phengite的约会，这表明Khan Tengri推力剪切区的顶部到南方运动中的结晶年龄; （3）在中生岩甲板下方的结晶地下磷灰石氦气（AHE）280-240 mA，这对最终挖掘阶段进行了洞察力。小七复冲击袋重击是由AHE Thermochronology表示的，其平均年龄为8.3 +/- 2.5 mA，同意与3km的挖出相似，类似于后期内科的顶部到北方运动的4.2公里。沿着西山南部的南北横断面距离Issyk-Kul Lake到塔里木盆地，编译的热量数据概述了序列超出序号，从朝向地壳尺度断层的激活，沿着22-15马北田山的北边缘，其次是20-10马术，在中南部和南田山之间的界限，并结束了南天山的<10 mA重新激活的斗篷。后者恰逢南天山前沿（Maidan Fault）和折叠和推力带向塔里木盆地传播。

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