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sedimentary evidence
相关语句
  沉积学证据
     Sedimentary Evidence of the Western Yunnan Plateau Uplift Since Miocene
     中新世以来滇西高原隆升的沉积学证据
短句来源
  “sedimentary evidence”译为未确定词的双语例句
     GEOMORPHIC AND SEDIMENTARY EVIDENCE FOR REVERSION OF STRIKE-SLIP DIRECTION IN LONGMEN SHAN FAULT ZONE
     龙门山断裂带走滑方向的反转及其沉积与地貌标志
短句来源
     Based on comparison of sedimentary evidence,tectonic evidence,geomorphic evidence and paleomagnetism between the Cenozoic and Mesozoic,we believe that the direction of strike-slip faulting has been rewersed from SSW-directed sinistral strike-slip in Mesozoic to NNE-directed dextral strike-slip in the Cenozoic.
     另外,根据沉积、构造、盆地充填体的几何形态、地貌、古地磁等标定和对比了龙门山在中生代和新生代的走滑方向,表明龙门山构造带在中生代与新生代之交走滑方向发生了反转,即由中生代时期的左行变为新生代时期的右行。
短句来源
  相似匹配句对
     On the Category of Evidence
     关于证据种类之思考
短句来源
     On Computer Evidence
     论计算机证据的有关问题
短句来源
     Geological and geochemical characteristics provide strong evidence for its sedimentary origin.
     地质及地球化学特征均显示矿床属沉积成因。
短句来源
     sedimentary conditions.
     在沉积上、构造上有独特之处。
短句来源
     Sedimentary Evidence of the Western Yunnan Plateau Uplift Since Miocene
     中新世以来滇西高原隆升的沉积学证据
短句来源
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  sedimentary evidence
The geomorphological and sedimentary evidence is used here to establish a preliminary model of tsunami sedimentation.
      
Sedimentary evidence for recent eutrophication in the northern basin of Lake Taihu, China: human impacts on a large shallow lake
      
Sedimentary evidence for changes in the pollution status of Taihu in the Jiangsu region of eastern China
      
Sedimentary evidence revealed corresponding strong high-lake signals c.
      
Even minor land use changes or disturbances in lake watersheds introduce ambiguity to the sedimentary evidence relating to atmospheric influences.
      
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The Kunlunshan Pass is located in theTibetan Plateau, between the Qiangtang Plateau andthe Qaidam Basin. Landform and sedimentary evidence shows that glaciations had occurred in theQuaternary.The moraines of the earliest and greatestglaciation in this region are found on the ridges of theKunlunshan beside the Jingxiangu valley and on thehill top of the southwestern Kunlunshan Pass.Tectonically tilted till is found on bedrock, alluvialfan sediment of Jingxiangu Formation, lacustrine andfan--delta sediment...

The Kunlunshan Pass is located in theTibetan Plateau, between the Qiangtang Plateau andthe Qaidam Basin. Landform and sedimentary evidence shows that glaciations had occurred in theQuaternary.The moraines of the earliest and greatestglaciation in this region are found on the ridges of theKunlunshan beside the Jingxiangu valley and on thehill top of the southwestern Kunlunshan Pass.Tectonically tilted till is found on bedrock, alluvialfan sediment of Jingxiangu Formation, lacustrine andfan--delta sediment of Qiangtang Formation. The tillis named Wangkun Till and this glaciation is namedWangkun Glaciation. According to paleomagneticdating, the B / M boundary has been found at the upper part of the Qiangtang Formation(near the top ),with an age of 0.73 Ma BP. The TL age of theWangkun Till is 543.47±109.69 ha BP, and ESR ageis 710± 228 ha BP. So the conclusion is that theWangkun Glaciation occurred from 0.7 Ma BP to 0.5Ma BP. The evidence of earlier till is found on thesouth slope of the eastern Kunlun Mountains andaeolian sand sediment is found in the lower part ofSanchahe Formation. This earlier glaciation is namedYakou Glaciation, and is dated about 0.26 Ma BP.The till of early Period of the Last Glaciation has beendestroyed, however aeolian sand remains in the upperpart of the Sanchahe Formation provide an evidenceof cold environment, with an age about 60 ka BP. Theclimax of the Last Glaciation exhibits one moraine,which is called Yuzhufeng Glaciation, formed in 20 to18 ka BP. Only one moraine is found of the LateGlaciation, formed in 14 to 13 ka BP. The morainesof Neoglaciation and Little Ice Age remain at the endof the modern glacier. The Neoglaciation tills formthree discontinuous moratines, about 5 m in height.The distance between the morain and the end of themodern glacier is about 80~100 m. The moraine ofthe Little Ice Age is located on mountain slope, andthere is an evident difference between theNeoglaciation and the Little Ice Age till.A detailed study reveals that the JingxianGlaciation and the Nachitai Glaciation, which werenamed by the former researchers, never existed. Theso-called“Jinxian Till” is actually the Wangkun Till.It was impossible to develop glacier during theTertiary and the early Pleistocene Period, because theelevation of this area was only about 1 000 m a.s.l. atthat time. The diamicton of Nachitaigou Formationhad been regarded as till, however there aregeomorphological and sedimentary analyses suggesting that it is debris-flow sediment.Based on the above facts, there are followingglaciations in this area: Wangkun Glaciation,YakouGlaciation, Yuzhufeng Glaciation, Late Glaciation,Neoglaciation and Little Ice Age. According to the tilldistribution it is believed that the scope of theglaciations decreases with time.

通过对昆仑山垭口地区冰碛和其它沉积物的物的野外调查及室内分析,并在运用各种年代学手段测定沉积物绝对年代的基础上,建立了垭口地区第四纪以来的冰期系列.即望昆冰期、垭门冰期、玉珠峰冰期、晚冰期、新冰期和小冰期.本区迄今未发现早更新世冰斯.

Geomorphic evidence for active tectonics in the Longmen Mountain at the eastern margin of the Tibetan Plateau has been studied in this paper.We have surveyed some typical geomorphic markers in Wenchuan-Maowen Fault,Beichuan Fault,Pengguan Fault,and Dayi Fault,including terrace offsets,scarps,fault-controlled saddles,dextral shutter ridges,dextral channel offsets,grabens,shatter belts, and pull-apart basins.Electron spin resonance(ESR) ages and thermoluminescence(TL) ages using silty sand taken from below the...

Geomorphic evidence for active tectonics in the Longmen Mountain at the eastern margin of the Tibetan Plateau has been studied in this paper.We have surveyed some typical geomorphic markers in Wenchuan-Maowen Fault,Beichuan Fault,Pengguan Fault,and Dayi Fault,including terrace offsets,scarps,fault-controlled saddles,dextral shutter ridges,dextral channel offsets,grabens,shatter belts, and pull-apart basins.Electron spin resonance(ESR) ages and thermoluminescence(TL) ages using silty sand taken from below the surface of sediments have been obtained.According to these data,we calculated the rate of thrusting and strike-slipping,and the results indicate that the Cenozoic tectonic shortening at the margin of the Tibetan Plateau is minor with the rate of thrusting smaller than 1.1mm/a and the rate of strike-slipping smaller than 1.46mm/a,and the Longmen Mountain is a zone of NNE-directed dextral shear with extensive strike-slip faulting and secondary thrusting with slip-dip ratio of 6(∶)1~1.3(∶)1.From NW to SE,the thrust component becomes smaller,but strike-slip component becomes bigger.However,this does not explain the presence of the abrupt topographic escarpment at the margin in the absence of major shortening.We thus infer that some escarpment reliefs are due to the effects of erosional unloading and strike-slipping.Based on comparison of sedimentary evidence,tectonic evidence,geomorphic evidence and paleomagnetism between the Cenozoic and Mesozoic,we believe that the direction of strike-slip faulting has been rewersed from SSW-directed sinistral strike-slip in Mesozoic to NNE-directed dextral strike-slip in the Cenozoic.

文章以青藏高原东缘龙门山活动构造的地貌标志为切入点,在汶川-茂汶断裂、北川断裂、彭灌断裂和大邑断裂等主干活动断裂的关键部位,对断错山脊、洪积扇、河流阶地、边坡脊、断层陡坎、河道错断、冲沟侧缘壁位错、拉分盆地、断层偏转、砾石定向带、坡中槽、弃沟和断塞塘等活动构造地貌和断裂带开展了详细的野外地质填图和地貌测量,利用精确的地貌测量数据和测年数据,定量计算了龙门山主干断裂的逆冲速率和走滑速率,结果表明在晚新生代时期龙门山构造带仅具有微弱的构造缩短作用,其中逆冲速率的速度值小于1.1mm/a,走滑速率的速度值小于1.46mm/a,表明走滑分量与逆冲分量的比率介于6∶1~1.3∶1之间,以右行走滑作用为主。在此基础上,对各主干活动断裂的逆冲速率和走滑速率进行了定量的对比研究,结果表明自北西向南东4条主干断裂的最大逆冲分量滑动速率具有变小的趋势,而走滑分量的滑动速率则具有逐渐变大的趋势,显示了从龙门山的后山带至前山带主干断裂的走滑作用越来越强。由此推测现今的龙门山及其前缘盆地不完全是由于构造缩短作用形成的,而主要是走滑作用和剥蚀卸载作用的产物。另外,根据沉积、构造、盆地充填体的几何形态、地貌、古地磁等标定和对比了龙门山在中...

文章以青藏高原东缘龙门山活动构造的地貌标志为切入点,在汶川-茂汶断裂、北川断裂、彭灌断裂和大邑断裂等主干活动断裂的关键部位,对断错山脊、洪积扇、河流阶地、边坡脊、断层陡坎、河道错断、冲沟侧缘壁位错、拉分盆地、断层偏转、砾石定向带、坡中槽、弃沟和断塞塘等活动构造地貌和断裂带开展了详细的野外地质填图和地貌测量,利用精确的地貌测量数据和测年数据,定量计算了龙门山主干断裂的逆冲速率和走滑速率,结果表明在晚新生代时期龙门山构造带仅具有微弱的构造缩短作用,其中逆冲速率的速度值小于1.1mm/a,走滑速率的速度值小于1.46mm/a,表明走滑分量与逆冲分量的比率介于6∶1~1.3∶1之间,以右行走滑作用为主。在此基础上,对各主干活动断裂的逆冲速率和走滑速率进行了定量的对比研究,结果表明自北西向南东4条主干断裂的最大逆冲分量滑动速率具有变小的趋势,而走滑分量的滑动速率则具有逐渐变大的趋势,显示了从龙门山的后山带至前山带主干断裂的走滑作用越来越强。由此推测现今的龙门山及其前缘盆地不完全是由于构造缩短作用形成的,而主要是走滑作用和剥蚀卸载作用的产物。另外,根据沉积、构造、盆地充填体的几何形态、地貌、古地磁等标定和对比了龙门山在中生代和新生代的走滑方向,表明龙门山构造带在中生代与新生代之交走滑方向发生了反转,即由中生代时期的左行变为新生代时期的右行。

 
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