New Apatite Fission-Track Ages of the Western Kuqa Depression:Implications for the Mesozoic–Cenozoic

来源 :Acta Geologica Sinica(English Edition) | 被引量 : 0次 | 上传用户:MyEclipse927
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The Mesozoic–Cenozoic uplift history of South Tianshan has been reconstructed in many ways using thermochronological analyses for the rocks from the eastern Kuqa Depression. The main difference in the reconstructions concerns the existence and importance of Early Cretaceous and Paleogene tectonic activities, but the existence of a Cenozoic differential uplift in the Kuqa Depression remains enigmatic. Here, we present new apatite fission-track ages obtained for 12 sandstone samples from the well-exposed Early Triassic to Quaternary sequence of the Kapushaliang section in the western Kuqa Depression. The results reveal that there were four pulses of tectonic exhumation, which occurred during the Early Cretaceous(peak ages of 112 and 105 Ma), Late Cretaceous(peak age of 67 Ma), Paleocene–Eocene(peak ages at 60, 53, and 36 Ma), and early Oligocene to late Miocene(central ages spanning 30–11 Ma and peak ages of 23 and 14 Ma), respectively. A review of geochronological and geological evidence from both the western and eastern Kuqa Depression is shown as follows.(1) The major exhumation of South Tians Shan during the Early Cretaceous was possibly associated with docking of the Lhasa block with the southern margin of the Eurasian plate.(2) The Late Cretaceous uplift of the range occurred diachronically due to the far-field effects of the Kohistan-Dras Arc and Lhasa block accretion.(3) The Paleogene uplift in South Tianshan initially corresponded to the far-field effects of the India–Eurasia collision.(4) The rapid exhumation in late Cenozoic was driven by the continuous far-field effects of the collision between India and Eurasia plates. The apatite fission-track ages of 14–11 Ma suggest that late Cenozoic exhumation in the western Kuqa Depression prevailed during the middle to late Miocene, markedly later than the late Oligocene to early Miocene activity in the eastern segment. It can be hypothesized that a possible differential uplift in time occurred in the Kuqa Depression during the late Cenozoic. The Mesozoic-Cenozoic uplift history of South Tianshan has been reconstructed in many ways using thermochronological analyzes for the rocks from the eastern Kuqa Depression. The main difference in the reconstructions concerns the existence and importance of Early Cretaceous and Paleogene tectonic activities, but the existence of a Cenozoic differential uplift in the Kuqa Depression remains enigmatic. Here, we present new apatite fission-track ages obtained for 12 sandstone samples from the well-exposed Early Triassic to Quaternary sequence of the Kapushaliang section in the western Kuqa Depression. The results reveal that there were four pulses of tectonic exhumation, which occurred during the Early Cretaceous (peak ages of 112 and 105 Ma), Late Cretaceous (peak age of 67 Ma), Paleocene-Eocene (peak ages at 60, 53, and 36 Ma) and early Oligocene to late Miocene (central ages spanning 30-11 Ma and peak ages of 23 and 14 Ma), respectively. A review of geochronological and geological e (1) The major exhumation of South Tians Shan during the Early Cretaceous was possibly associated with docking of the Lhasa block with the southern margin of the Eurasian plate. (2) The Late Cretaceous uplift of the range occurred diachronically due to the far-field effects of the Kohistan-Dras Arc and Lhasa block accretion. (3) The Paleogene uplift in South Tianshan to do far-field effects of the India-Eurasia collision. (4) The rapid exhumation in late Cenozoic was driven by the continuous far-field effects of the collision between India and Eurasia plates. The apatite fission-track ages of 14-11 Ma suggest that late Cenozoic exhumation in the western Kuqa Depression prediled during the middle to late Miocene, markedly later than the late Oligocene to early Miocene activity in the eastern segment. It can be hypothesized that a possible differential uplift in time occurred in the Kuq a Depression during the late Cenozoic.
其他文献
要应对经济全球化和入世的挑战,适应新经济的发展态势,高速公路的运营和管理必须与国际惯例接轨,学习和借鉴发达国家的先进经验和先进做法。同时必须在学习中应对挑战,在发
会议
《西藏镇魔图》唐卡,长165厘米,宽78厘米,画面高152.5厘米,宽72厘米,是20世纪90年代初期西藏文管会进行文物建档时整理发现的两幅唐卡作品,一幅收藏在罗布林卡管理处,另一幅
期刊
贝叶经,即写在贝多罗树叶子上之经.“考诸《一切经音义》,贝多树名棕之类,五印度皆有之,而南印度最佳,其叶可裁为纸,用以写经.”[1]“印度旧日经典,均手写于棕榈树叶之上,吾
期刊
会议
and
2020年5月28日,十三届全国人大三次会议审议通过了《中华人民共和国民法典》(以下简称《民法典》),这次会议有很多的亮点,其中最大亮点之一是宣告编纂《民法典》的立法任务正
期刊
会议
中国共产党第十九届中央委员会第五次全体会议,于2020年10月26日至29日在北京举行.全会听取和讨论了习近平总书记受中央政治局委托作的工作报告,审议通过了《中共中央关于制
期刊
会议
从2014年春到2019年秋,笔者三次公派赴我国台湾地区访学.期间,竭尽心力搜集有关民国时期西藏哲蚌寺汉僧欧阳无畏[1]的各类著作文稿(包括内部出版品、非卖品),仅就视域所及,计
期刊