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国家自然科学基金(40472109)

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Crust Shortening of the Daliangshan Tectonic Zone in the Cenozoic Era and Its Implications
2009年
The Daliangshan tectonic zone is a rhombic area to the east of the Anninghe and Zemuhe fault zones in the middle segment of the Xianshuihe-Xiaojiang fault system along the southeast margin of the Qinghai-Xizang(Tibet)Plateau.Since the Cenozoic era,the neotectonic deformation in the Daliangshan tectonic zone has presented not only sinistral slip and reverse faulting along the Daliangshan fault zone,but also proximate SN-trending crust shortening.It is estimated that the average crust shortening in the Daliangshan tectonic zone is 10.9±1.6 km,with a shortening rate of 17.8±2.2% using the method of balanced cross-sections.The crust shortening from folding occurred mainly in the Miocene and the Pliocene periods,lasting no more than 8.6 Ma.Based on this,a crust shortening velocity of 1.3±0.2 mm/a can be estimated.Compared with the left offset along the Daliangshan fault zone,it is recognized that crust shortening by folding plays an important part in transferring crustal deformation southeastward along the Xianshuihe-Xiaojiang fault system.
Chen ChangyunHe Honglin
关键词:地壳缩短新构造变形断层滑动
安宁河断裂带晚第四纪运动特征及模式的讨论被引量:52
2007年
安宁河断裂带是中国西南地区一条重要的地震活动断层,地方志记载公元1536年曾发生过震级大于7级的破坏性地震.详细的断裂地貌航片解译和野外调查表明,安宁河断裂带除具有主要的左旋走滑断层活动外,还兼有重要的逆冲运动分量.根据冲沟和阶地面的位错量及其热释光测年结果估计,该断裂带晚更新世以来平均左旋走滑速率为3~7mm/a.根据滑移方向与断层走向的关系,推测跨安宁河断裂带东西向由于逆冲断层运动造成的挤压缩短速率约为1.7~4.0mm/a;简单分解鲜水河断裂带上的滑动速率,估计分配在大凉山断裂带上的滑动速率与安宁河断裂带上的大致相当,约为3~7mm/a.此外,根据野外调查结果,并结合最近青藏高原构造动力学研究的新认识,建立了安宁河断裂带的动力学模型,认为安宁河断裂带是一条逆冲走滑断裂带.其下盘(西盘)主动向南东方向下插,造成了上盘(东盘)向北西方向的上冲运动.
何宏林池田安隆
关键词:活动断层逆冲断层滑动速率安宁河断裂
Faulting on the Anninghe fault zone,Southwest China in Late Quaternary and its movement model被引量:4
2007年
The Anninghe fault is one of the significant earthquake-generating fault zones in the Southwest China. Local historical record shows that a M2≥7 strong earthquake occurred in the year of 1536. On the basis of the detailed air-photographic interpretation and field investigation, we have acquired the following knowledge: ① The average sinistral strike-slip rate since the Late Pleistocene is about 3~7 mm/a; ② There is important reverse faulting along the fault zone besides the main left-lateral strike-slip motion, and the shortening rate across the Anninghe fault zone due to the reverse faulting is about 1.7-4.0 mm/a. If the Xianshuihe fault zone is simply partitioned into the Anninghe and Daliangshan faults, we can also get a slip rate of 3-7 mm/a along the Daliangshan fault zone, which is the same as that on the Anninghe fault zone. Moreover, on the basis of our field investigation and the latest knowledge concerning the active tectonics of Tibetan crust, we create a dynamic model for the Anninghe fault zone.
何宏林池田安隆
新生的大凉山断裂带--鲜水河-小江断裂系中段的裁弯取直被引量:60
2008年
部分由于缺乏破坏性地震记录,部分由于处于边远山区,作为鲜水河-小江断裂系一部分的大凉山断裂带长期被研究者们忽视,以至于在描述该断裂系时,往往不把大凉山断裂带算在其中.造成大凉山断裂带被忽视的另一个重要的原因是该断裂带是一条新生的构造带,新生性决定了其成熟度低于鲜水河-小江断裂系中的其他断裂带,所反映的线性断裂地貌特征不如其他断裂带明显.两年多详细的遥感解译和野外调查结果表明大凉山断裂是一条新生的断裂带:(1)具有复杂几何结构的大凉山断裂带无论是连续性还是成熟度都明显低于鲜水河.小江断裂系中的其他断裂带;(2)大凉山断裂带南、北两段的活动性高于中段,而且北段的左旋位错量是南段的3倍,小震活动在中段也存在一个明显的空区,说明大凉山断裂带还没有完全贯通,尚处于从两端向中间发展的早期阶段;(3)大凉山断裂带上地质体反映的总位错和水系的位错基本相同,说明大凉山断裂带开始于该地区水系成型之后,而鲜水河-小江断裂系中其他断裂带上的总位错远大于水系所反映的位错;(4)探槽揭示的古地震事件和用断错地貌和GPS观测结果估计的水平滑动速率3~4mm/a,都表明大凉山断裂带与安宁河、则木河断裂带一样也是一条强震构造带;(5)在滑动速率大致相当的情况下,并假定各断裂带在整个发育历史中滑动速率基本不变,大凉山断裂带产生11km的滑移量需要2.7~3.7Ma,而安宁河和则木河断裂带完成47~53km的位错量需要12~18Ma.进一步推断,新生的大凉山断裂带产生于鲜水河-小江断裂系中段的“裁弯取直”,而“裁弯取直”是由于青藏高原南东块体相对刚性的顺时针旋转造成的.随着“裁弯取直”的持续发展,大凉山断裂带将可能逐渐取代安宁河和则�
何宏林池田安隆何玉林东乡正美陈杰陈长云田力正好越後智雄冈田真介
Uniform Strike-Slip Rate along the Xianshuihe-Xiaojiang Fault System and Its Implications for Active Tectonics in Southeastern Tibet被引量:18
2006年
Recent studies on the Xianshuihe-Xiaojiang fault system suggest that the Late Quaternary strike-slip rate is approximately uniform along the entire length of the fault zone, about 15±2 mm/a. This approximately uniform strike slip rate strongly supports the clockwise rotation model of the southeastern Tibetan crust. By approximating the geometry of the arc-shaped Xianshuihe-Xiaojiang fault system as a portion of a small circle on a spherical Earth, the 15±2 mm/a strike slip rate corresponds to clockwise rotation of the Southeastern Tibetan Block at the (5.2±0.7)×10^-7 deg/a angular velocity around the pole (21°N, 88°E) relative to the Northeast Tibetan Block. The approximately uniform strike slip rate along the Xianshuihe-Xiaojiang fault system also implies that the Longmeushan thrust zone is not active, or at least its activity has been very weak since the Late Quaternary. Moreover, the total offset along the Xiaushuihe-Xiaojiang fault system suggests that the lateral extrusion of the Southeastern Tibetan Block relative to Northeastern Tibetan Block is about 160 km and 200-240 km relative to the Tarim-North China block. This amount of lateral extrusion of the Tibetan crust should have accommodated about 13-24% convergence between India and Eurasia based on mass balance calculations. Assuming that the slip rate of 15±2 mm/a is constant throughout the entire history of the Xianshuihe-Xiaojiang fault system, 11±1.5 Ma is needed for the Xianshuihe-Xiaojiang fault system to attain the 160 km of total offset. This implies that left-slip faulting on the Xianshuihe-Xiaojiang fault system might start at 11±1.5 Ma.
HE HonglinRAN HongliuYasutaka IKEDA
大凉山地区新生代地壳缩短及其构造意义被引量:17
2008年
大凉山地区位于青藏高原的东南边缘,具体指鲜水河-小江断裂带中段安宁河断裂带和则木河断裂带以东的菱形地区。新生代以来大凉山地区的新构造运动不仅表现为沿区内大凉山断裂带的左旋走滑和逆冲2种分量的断层运动,还表现为轴向近SN的褶皱缩短。利用平衡剖面方法结合误差分析得出研究区的地壳平均缩短量为(10.9±1.6)km,缩短率为(17.8±2.2)%。研究区发生缩短变形的时间段主要集中在中新世和上新世(12~3.4MaBP),结合地壳缩短量计算出的研究区地壳缩短速率为(1.3±0.2)mm/a。对比沿大凉山断裂带的左旋滑动量,可以看出这种褶皱形式的地壳缩短在沿鲜水河-小江断裂带向SE方向传递左旋位移的过程中起着重要的作用。
陈长云何宏林
关键词:地壳缩短青藏高原
Newly-generated Daliangshan Fault Zone—Shortcutting on the central section of Xianshuihe-Xiaojiang fault system被引量:24
2008年
The Daliangshan fault zone is the eastern branch in the central section of Xianshuihe-Xiaojiang fault system. It has been neglected for a long time, partly because of no destructive earthquake records along this fault zone. On the other hand, it is located on the remote and inaccessible plateau. So far it was excluded as part of the Xianshuihe-Xiaojiang fault system. Based on the interpretation of aerophotographs and field investigations, we document this fault zone in detail, and give an estimation of strike-slip rate about 3 mm/a in Late Quaternary together with age dating data. The results suggest that the Daliangshan fault zone is a newly-generated fault zone resulted from shortcutting in the central section of Xianshuihe-Xiaojiang fault system because of the clockwise rotation of the Southeastern Tibetan Crustal Block, which is bounded by the Xianshuihe-Xiaojiang fault system. Moreover, the shortcutting may make the Daliangshan fault zone replace the Anninghe and Zemuhe fault zones gradually, and finally, the later two fault zones will probably die out with the continuous clockwise rotation.
IKEDA YasutakaTOGO MasayoshiTAJIKARA MasayoshiECHIGO TomooOKADA Shinsuke
关键词:FAULTFAULTFAULTSOUTHEASTTIBET
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