Spatial patterns of erosion and landscape evolution in a bivergent metamorphic core complex revealed by cosmogenic 10Be: The central Menderes Massif (western Turkey)

Spatial patterns of erosion and landscape evolution in a bivergent metamorphic core complex revealed by cosmogenic 10Be: The central Menderes Massif (western Turkey)
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宇宙成因 10Be 揭示的双发变质核复合体中侵蚀和景观演化的空间模式:中央门德雷斯地块(土耳其西部)

DOI:
10.1130/ges02013.1
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发表时间:
--
期刊:
影响因子:
2.5
通讯作者:
Hampel
Hampel
中科院分区:
地球科学2区
文献类型:
--
作者:
Heineke;Hetzel;Nilius;Glotzbach;Christl;Hampel

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在具有低角度正断层的伸展区域(如爱琴海地区),构造过程和侵蚀都引起景观变化,但它们在伴随大陆伸展的地形和地貌演变过程中的相互作用很少被提及。在这里,我们提出了本地和流域范围内的10 Be侵蚀率,记录在中央Menderes地块,变质核复杂的两个不对称的山脉(BozdaExpense和Aydın)的剥离断层和活动地堑约束的侵蚀的空间格局。BozdaExpense山脉北方侧翼的全流域侵蚀率相当低(40-110 mm/k.y.)但达到>300 mm/k. y的值。在陡峭的南部悬崖上,这种模式反映了地形和基岩岩性。在艾登山脉,侵蚀率通常较高,平均侵蚀率为190毫米/公里和260毫米/公里。在北方和南翼,分别,和更多的变化沿着走向。在这两个范围内,来自混合碎屑的山脊顶部的侵蚀速率为30-90 mm/k. y。当地和流域范围内的侵蚀速率之间的差异表明,地形起伏的增加,在大多数地区的BAREF在响应正在进行的断层相关的隆起和伴随的河流切割。我们的研究结果表明,构造过程中发挥了重要的控制作用,在积极的大陆伸展景观演变,并反映在地形签名和侵蚀的空间格局。在Menderes地块,岩石对风化和侵蚀的敏感性是控制侵蚀对岩石剥露作用的主导因素,其在空间上的变化范围在10%到150%之间。
In extensional provinces with low-angle normal faulting (such as the Aegean region), both tectonic processes and erosion induce landscape change, but their interaction during the evolution of topography and relief accompanying continental extension has rarely been addressed. Here we present local and catchment-wide10Be erosion rates that document the spatial pattern of erosion in the central Menderes Massif, a metamorphic core complex consisting of two asymmetric mountain ranges (Bozdağ and Aydın) bound by detachment faults and active grabens. Catchment-wide erosion rates on the northern flank of the Bozdağ Range are rather low (40–110 mm/k.y.) but reach values of >300 mm/k.y. on the steep southern escarpment—a pattern that reflects both topography and bedrock lithology. In the Aydın Range, erosion rates are generally higher, with mean erosion rates of ∼190 and ∼260 mm/k.y. on the northern and southern flank, respectively, and more variable along strike. In both ranges, erosion rates of ridge crests derived from amalgamated clasts are 30–90 mm/k.y. The difference between local and catchment-wide erosion rates indicates that topographic relief increases in most parts of the massif in response to ongoing fault-related uplift and concomitant river incision. Our findings document that tectonic processes exert a significant control on landscape evolution during active continental extension and are reflected in both the topographic signature and the spatial pattern of erosion. In the Menderes Massif, rock susceptibility to weathering and erosion is a dominant factor that controls the erosional contribution to rock exhumation, which varies spatially between ∼10% and ∼50%.
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