羌塘盆地中央隆起带的抬升演化:构造-热年代学约束
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  • 英文篇名:Uplifting evolution of the Central Uplift Belt,Qiangtang:constraints from tectono-thermochronology
  • 作者:赵珍 ; 陆露 ; 吴珍汉
  • 英文作者:ZHAO Zhen;LU Lu;WU Zhenhan;Chinese Academy of Geological Sciences;College of Paleontology,Shenyang Normal University;
  • 关键词:裂变径迹 ; 热史模拟 ; 构造-热年代学 ; 中央隆起 ; 羌塘
  • 英文关键词:fission track;;thermal history modeling;;tectono-thermochronology;;Central Uplift Belt;;Qiangtang
  • 中文刊名:DXQY
  • 英文刊名:Earth Science Frontiers
  • 机构:中国地质科学院;沈阳师范大学古生物学院;
  • 出版日期:2018-09-27 15:48
  • 出版单位:地学前缘
  • 年:2019
  • 期:v.26;No.136
  • 基金:中国地质调查局项目“羌塘盆地隆鄂尼-鄂斯玛地区油气地质构造调查”(DD20160161)
  • 语种:中文;
  • 页:DXQY201902023
  • 页数:15
  • CN:02
  • ISSN:11-3370/P
  • 分类号:253-267
摘要
本文综合磷灰石裂变径迹年龄(113~43 Ma)、锆石裂变径迹年龄(169~103 Ma)、锆石U-Pb年龄(215~206 Ma)、黑云母K-Ar年龄(186~178 Ma),通过磷灰石热史模拟,TASC图谱分析和矿物封闭温度-年龄等手段,获得了中央隆起晚三叠世至今较为完整的冷却抬升历史。中央隆起主要经历了早侏罗世、晚侏罗世—早白垩世、晚白垩世—中新世早期和中新世晚期至今四期冷却事件,与南北羌塘板块后碰撞伸展、拉萨-羌塘板块碰撞、新特提斯洋板片俯冲、印度-欧亚板块碰撞以及中新世南北向走滑-伸展存在动力学联系,造成11.4km、2.85km、4.3~5km和0.85km的抬升量。中央隆起在侏罗纪相对两侧盆地抬升,随着两侧盆地经历了侏罗纪的沉积增厚,与两侧盆地高差减小,在早白垩世早期可能位于海平面附近,随后快速抬升至2~2.5km,统一接受晚白垩世红层沉积,并经历长期持续的逆冲推覆构造活动,进一步抬升至5km,随后受到中新世古大湖夷平和南北向伸展作用影响,中央隆起相对盆地发生差异抬升。
        Based on our measurements of fission track ages of apatites(113-43 Ma)and zircons(169-103 Ma),U-Pb ages of zircons(215-206 Ma)and K-Ar ages of biobites(186-178 Ma)of granite samples,we performed apatite fission track thermal history modeling and track age spectra calculation(TASC)to obtain up-to-date histories of uplifting and cooling of the Qiangtang Central Uplift Belt(QCUB)since the Late Triassic.The QCUB experienced four major uplifting-cooling episodes,namely the Early Jurassic,Late Jurassic-Early Cretaceous,Late Cretaceous-early Miocene and later Miocene.The four episodes correspond to the dynamics of the post-collision stretching of the South and North Qiangtang blocks,Lhasa-South Qiangtang collision,Neo-Tethys ocean subduction,and Indo-Asian collision and N-S strike-slip movement,respectively,and experienced upliftings of 11.4,2.85,4.3-5 and 0.85 km,respectively.The QCUB probably was at sea level in the Early Cretaceous,and rapidly uplifted to 2-2.5 km in the Late Cretaceous;during 90-20 Ma,the long term thrusting systems caused further uplifting to ~5 km,followed by differential surface uplifting due to the denudation effect of the Great Lakes and the south-north strike-slip action in the Miocene.
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