干旱区生态环境知识资源中心(Arid): Using spatial patterns of fluvial incision to constrain continental-scale uplift in the Andes

Arid

DOI	10.1016/j.gloplacha.2020.103119
	Using spatial patterns of fluvial incision to constrain continental-scale uplift in the Andes
	Evenstar, L. A.1; Mather, A. E.2; Hartley, A. J.3
通讯作者	Evenstar, L. A.
来源期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
EISSN	1872-6364
出版年	2020
卷号	186
英文摘要	Geomorphic archives, particularly longitudinal river profiles, are increasingly used as a proxy to reconstruct uplift rates in mountainous regions. Within the Atacama Desert, Northern Chile, slow, long-term erosion creates exceptional preservation of fluvial and alluvial surfaces. This enables river incision patterns to be used on a continental-scale (> 250 km) along the western margin of the Andes (18 degrees 00'S to 20 degrees 15'S) and over a time frame from Miocene to Present day. The data show marked compartmentalisation of fluvial system behaviour with changes in incision rates from south to north creating 3 distinctly different regions. Within these different sectors, incision rates are broadly consistent between rivers suggesting a regional rather than a river specific control on rates. In Sector 1 (18 degrees 05'S to 19 degrees 20'S) the fluvial systems are exorheic with a terminal base level (the lowest base level to which the river system can erode) in the Pacific Ocean and span the Coastal Cordillera, Longitudinal Valley, Precordillera and western edge of the Western Cordillera. This constrains the total uplift over these regions to a minimum of 1200 m in 11 Myr with incision rates of similar to 200-120 m/Myr consistent with rapid but sustained uplift of the Andes in the Late Miocene. In Sector 2 (19 degrees 20'S to 19 degrees 50'S), to the immediate south, the rivers are shorter and terminate in the Longitudinal Valley, spanning only the Longitudinal Valley, Precordillera and the western edge of the Western Cordillera with lower incision rates of 100-50 m/Myr. Comparison of incision rates between Sector 1 and 2 can constrain the uplift of the Coastal Cordillera to 60 m/Myr which is in keeping with previous studies from the region. In southernmost Sector 3 (19 degrees 50'S to 20 degrees 10'S), the fluvial systems terminate in the Longitudinal Valley and span only the Longitudinal Valley and eastern part of the Precordillera with low incision rates of 50 to 25 m/Myr. Differences between Sectors 2 and 3 are attributable to drainage loss by tectonic beheading of catchments through uplift of the Cordillera de Domeyko fault system, placing a minimum constrain on uplift in this region of 50 to 25 m/Myr. This study demonstrates the applicability of large-scale fluvial archives to access not just the timing of uplift on a continental scale, but also the relative uplift of individual tectonic provinces.
英文关键词	Andes Paleosurface Atacama Desert pavement Landscape evolution Climate Base levels Fluvial incision Fluvial archives Terraces
类型	Article
语种	英语
国家	England ; Scotland
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000526518600009
WOS关键词	NORTHERN CHILE ; ATACAMA DESERT ; CANYON INCISION ; LATE MIOCENE ; LANDSCAPE DEVELOPMENT ; VALLEY INCISION ; FORE-ARC ; EVOLUTION ; BASIN ; RIVER
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314626
作者单位	1.Univ Brighton, Sch Environm & Technol, Brighton, E Sussex, England; 2.Univ Plymouth, Dept Geog Earth & Environm Sci, Plymouth, Devon, England; 3.Univ Aberdeen, Dept Geol & Petr Geol, Aberdeen, Scotland
推荐引用方式 GB/T 7714	Evenstar, L. A.,Mather, A. E.,Hartley, A. J.. Using spatial patterns of fluvial incision to constrain continental-scale uplift in the Andes[J],2020,186.
APA	Evenstar, L. A.,Mather, A. E.,&Hartley, A. J..(2020).Using spatial patterns of fluvial incision to constrain continental-scale uplift in the Andes.GLOBAL AND PLANETARY CHANGE,186.
MLA	Evenstar, L. A.,et al."Using spatial patterns of fluvial incision to constrain continental-scale uplift in the Andes".GLOBAL AND PLANETARY CHANGE 186(2020).