干旱区生态环境知识资源中心(Arid): The origins and implications of paleochannels in hyperarid, tectonically active regions: The northern Atacama Desert, Chile

Arid

DOI	10.1016/j.gloplacha.2019.103083
	The origins and implications of paleochannels in hyperarid, tectonically active regions: The northern Atacama Desert, Chile
	Binnie, S. A.1; Reicherter, K. R.2; Victor, P.3; Gonzalez, G.4,5; Binnie, A.1; Niemann, K.2; Stuart, F. M.7; Lenting, C.1; Heinze, S.6; Freeman, S. P. H. T.7; Dunai, T. J.1
通讯作者	Binnie, S. A.
来源期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
EISSN	1872-6364
出版年	2020
卷号	185
英文摘要	Preserved remnants of fluvial activity in deserts constitute evidence for changing boundary conditions. The Atacama Desert of northern Chile is the global end-member for aridity, so the history of relict stream networks in this region is a record of how landscapes develop under extreme conditions. On Pampa de Tana in northern Chile (19.4 degrees S), a series of channel forms that are presently inactive but in the past flowed westward are incised into the surface of a fault bounded, topographically elevated portion of the El Diablo Formation, a regionally extensive, relict pediment. We measure cosmic-ray produced Be-10, Al-26 and Ne-21 in fluvial deposits to date the timing of abandonment of three channels and couple this with topographic profile information from a SPOT-6 derived, 2 m resolution digital elevation model. We find two of the channels were abandoned approximately > 5.6 Myr and 2.0 Myr ago. One channel is still capable of flow and has ages suggesting it was fluvially active within the last few hundred thousand years. Using the paleochannel ages measured here and published ages for the end of aggradation of the El Diablo Formation we estimate the rates of fluvial channel incision before channel abandonment, and uplift rates on the faults after channel abandonment. Maximum uplift rates of similar to 12 m/Myr over the last 2 Myr are found. In general, while rates of uplift are relatively low they are several-fold more rapid than the rates of fluvial incision prior to channel abandonment. This implies that westward channel flow was interrupted by uplift of topography above a blind NW-SE striking reverse fault that affects the Central Depression, an alluvial forearc basin. We consider also that shrinkage of the upstream catchment area by stream capture, promoted via headward erosion and lateral expansion of adjacent canyons (quebradas) could be a factor in the abandonment of the channels on Pampa de Tana. Our results highlight the polygenetic nature of this landscape and show that relatively minor amounts of fault displacement in hyperarid regions can have implications for stream network evolution. Even subtle topographic uplift upstream should be taken into account when fluvial deposits are used as proxies for long-term environmental conditions.
英文关键词	Paleodrainage Channel abandonment Multiple cosmogenic nuclides Hyperaridity Uplift rates Pampa de Tana
类型	Article
语种	英语
国家	Germany ; Chile ; Scotland
开放获取类型	Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000510315900001
WOS关键词	WIND-GAP FORMATION ; LANDSCAPE EVOLUTION ; DENUDATION RATES ; COSMOGENIC NE-21 ; EXPOSURE AGES ; LATE MIOCENE ; HALF-LIFE ; CLIMATE ; BE-10 ; NEOGENE
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/2XILL650/314622
作者单位	1.Univ Cologne, Inst Geol & Mineral, D-50674 Cologne, Germany; 2.Rhein Westfal TH Aachen, Neotecton & Nat Hazards, D-52056 Aachen, Germany; 3.Helmholtz Zentrum Potsdam Deutsch GeoForschungsZe, D-14473 Potsdam, Germany; 4.Univ Catolica Norte, Dept Ciencias Geol, Antofagasta, Chile; 5.Natl Res Ctr Integrated Nat Disaster Management C, Santiago 4860, Chile; 6.Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany; 7.Scottish Univ Environm Res Ctr SUERC, E Kilbride G75 0QF, Lanark, Scotland
推荐引用方式 GB/T 7714	Binnie, S. A.,Reicherter, K. R.,Victor, P.,et al. The origins and implications of paleochannels in hyperarid, tectonically active regions: The northern Atacama Desert, Chile[J],2020,185.
APA	Binnie, S. A..,Reicherter, K. R..,Victor, P..,Gonzalez, G..,Binnie, A..,...&Dunai, T. J..(2020).The origins and implications of paleochannels in hyperarid, tectonically active regions: The northern Atacama Desert, Chile.GLOBAL AND PLANETARY CHANGE,185.
MLA	Binnie, S. A.,et al."The origins and implications of paleochannels in hyperarid, tectonically active regions: The northern Atacama Desert, Chile".GLOBAL AND PLANETARY CHANGE 185(2020).