Rates of river incision across the main tectonic units of the Pamir identified using optically stimulated luminescence dating of fluvial terraces
Rates of river incision across the main tectonic units of the Pamir identified using optically stimulated luminescence dating of fluvial terraces
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利用河流阶地光激发光测年技术确定帕米尔高原主要构造单元的河流切入率
DOI：
10.1016/j.geomorph.2014.03.027
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发表时间：
2014
期刊：
影响因子：
3.9
通讯作者：
Krbetschek
中科院分区：
文献类型：
--
作者：
Gloaguen;Krbetschek
沿着帕米尔高原的主要河流Panj计算出的切口率被用来研究构造或气候对河流结构的任何影响。利用光激发光法（OSL）对阶地砂进行定年，计算了盘吉河阶地沉积时代。通过将阶地沉积时代与现代潘吉河上阶地高度的精确GPS运动测量相结合，得出了河流切割率。我们调查了帕米尔高原西部沿Panj的16个阶地和帕米尔高原北部沿Vakhsh河的1个阶地。结果显示，在过去26年里，河流沉积的时间很短。Panj阶地最古老的沉积时代与帕米尔高原早期MIS 2和MIS 2/1冰期相吻合。较年轻的阶地年龄与冰川旋回没有明显的联系。现代Panj不同地区不同高度的阶地产生了相似的沉积时代。这表明当地的条件决定了河流的切口率。综合所有阶地测量结果，在过去26 kyr中，Panj的平均切口率约为5.6 mm/yr。从Panj在Shakhdara圆顶上切割了一个陡峭的山谷的梯田中，计算出了约7.3 mm/年的高平均切割速率。从沿Shakhdara和Yazgulom圆顶南部边界的Panj流的阶地计算出明显较低的切口速率（~ 2-3 mm/yr）。在这些地方，潘济河剖面的梯度段和河谷宽度的增加表明了当地的基准面。在Yazgulom穹窿下游，河流切割速率一般低于Panj平均值（~ 4-5 mm/年）。然而，有一个例外，在Darvaz断裂带上游计算出较高的切割速率（~ 6毫米/年），Darvaz断裂带是形成帕米尔高原西部边界的主要构造特征。与Panj平均值相比，帕米尔高原北部的Vakhsh河阶地的切口率较低（约3毫米/年）。沿潘杰河的切口率变化并不对应于岩石类型或河流集水区的变化。相反，切割速率似乎主要受到河流在帕米尔高原南部和中部变质丘上的影响。无论Panj在哪里切割这些圆顶，它都显示出一个凸出的河流轮廓。局部河流轮廓的凹凸性和帕米尔圆顶上切口率的变化表明，圆顶边界最近一直处于活跃状态。
Calculated incision rates along the Panj, the main river of the Pamir, are used to investigate any influence by tectonics or climate on the architecture of the river. The depositional ages of Panj River terraces were calculated using optically stimulated luminescence (OSL) dating of terrace sand. Fluvial incision rates were generated by integrating the terrace depositional ages with accurate kinematic GPS measurements of terrace heights above the modern Panj. We investigated 16 terraces along the Panj at the western Pamir margin and one terrace from the Vakhsh River to the north of the Pamir. The results reveal brief periods of fluvial deposition over the past 26 kyr. The oldest Panj terrace depositional ages coincide with early MIS 2 and MIS 2/1 glaciations on the Pamir Plateau. Younger terrace ages have no apparent link with glacial cycles. Terraces with varying heights above the modern Panj at different localities yielded similar depositional ages. This suggests that local conditions have determined fluvial incision rates. Combining all of the terrace measurements, the average incision rate of the Panj over the last 26 kyr has been ~ 5.6 mm/yr. A high mean incision rate of ~ 7.3 mm/yr was calculated from terraces where the Panj has cut a steep-sided valley through the Shakhdara dome. Significantly lower incision rates (~ 2–3 mm/yr) were calculated from terraces where the Panj flows along the southern boundaries of the Shakhdara and Yazgulom domes. At those localities, graded segments of the Panj River profile and increased valley widths are indicative of local base levels. Downstream of the Yazgulom dome, river incision rates are generally lower (~ 4–5 mm/yr) than the Panj average. However, there is one exception where higher incision rates (~ 6 mm/yr) were calculated upstream of the Darvaz Fault Zone, a major tectonic feature that forms the western boundary of the Pamir. The Vakhsh River terrace to the north of the Pamir yielded a lower incision rate (~ 3 mm/yr) compared to the Panj average. Variation in incision rates along the Panj does not correspond to changes in rock type or river catchment area. Instead, incision rates appear to have been primarily influenced by river capture across the southern and central metamorphic domes of the Pamir. Wherever the Panj cuts these domes it displays a convex river profile. The combination of localized river profile convexity and changes in incision rates across the Pamir domes indicates that the dome boundaries have been active recently.
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影响因子：
2.3
作者：
I. Röhringer;R. Zech;U. Abramowski;P. Sosin;A. Aldahan;P. Kubik;L. Zöller;W. Zech
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I. Röhringer;R. Zech;U. Abramowski;P. Sosin;A. Aldahan;P. Kubik;L. Zöller;W. Zech
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影响因子：
2.3
作者：
J. Carcaillet;J. Mugnier;R. Koçi;F. Jouanne
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F. Jouanne
测试纵向河流剖面某些参数的构造意义：以阿登河为例（比利时，欧洲西北部）
DOI：
--
发表时间：
1998
期刊：
影响因子：
--
作者：
A. Demoulin
通讯作者：
A. Demoulin
沉积物古剂量测定中的放射性不平衡
DOI：
--
发表时间：
1994
期刊：
影响因子：
--
作者：
M. Krbetschek;U. Rieser;L. Zöller;J. Heinicke
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一个等份中有多少粒谷物
DOI：
--
发表时间：
2012
期刊：
影响因子：
--
作者：
Aleksandra J. Heer;G. Adamiec;P. Moska
通讯作者：
P. Moska