干旱区生态环境知识资源中心(Arid): Chronology of terraces in the Rio Grande rift, Socorro basin, New Mexico: Implications for terrace formation

Arid

DOI	10.1130/GES02220.1
	Chronology of terraces in the Rio Grande rift, Socorro basin, New Mexico: Implications for terrace formation
	Sion, Brad D.; Phillips, Fred M.; Axen, Gary J.; Harrison, J. Bruce J.; Love, David W.; Zimmerer, Matthew J.
通讯作者	Sion, BD
来源期刊	GEOSPHERE
ISSN	1553-040X
出版年	2020
卷号	16 期号:6 页码:1457-1478
英文摘要	The Rio Grande rift hosts a remarkable record of Quaternary river incision preserved in an alluvial terrace sequence that has been studied for more than a century. However, our understanding of Rio Grande incision history in central New Mexico since the end of basin filling ca. 0.78 Ma remains hampered by poor age control. Robust correlations among Rio Grande terrace sequences in central and southern New Mexico are lacking, making it difficult to address important process-related questions about terrace formation in continental-scale river systems. We present new age controls using a combination of Ar-40/Ar-39, Cl-36 surface-exposure, and C-14 dating techniques from alluvial deposits in the central New Mexico Socorro area to document the late Quaternary incision history of the Rio Grande. These new age controls (1) provide constraints to establish a firm foundation for Socorro basin terrace stratigraphy, (2) allow terrace correlations within the rift basin, and (3) enable testing of alternative models of terrace formation. We identified and mapped a high geomorphic surface interpreted to represent the end of basin filling in the Socorro area and five distinct, post-Santa Fe Group (ca. 0.78 Ma) alloformations and associated geomorphic surfaces using photogrammetric methods, soil characterization, and stratigraphic descriptions. Terrace deposits exhibit tread heights up to 70 m above the valley floor and are 5 to >30 m thick. Their fills generally have pebble-to-cobble bases overlain by fine-to-pebbly sand and local thin silt and clay tops. Alluvial-fan terraces and associated geomorphic surfaces grade to former valley levels defined by axial terrace treads. Carbon-14 ages from detrital charcoal above and below a buried tributary terrace tread show that the most recent aggradation event persisted until ca. 3 ka during the transition from glacial to modern climate conditions. Drill-log data show widespread valley fill similar to 30 m thick that began aggrading after glacial retreat in northern New Mexico and southern Colorado (ca. 14 ka). Aggradation during this transition was likely due to hillslope destabilization, increased sediment yield, decreased runoff, and reduced stream competence. Chlorine-36 ages imply similar controls on earlier terraces that have surface ages of ca. 27-29, 64-70, and 135 ka, and suggest net incision during glacial expansions when increased runoff favored down-cutting and bedload mobilization. Our terrace chronology supports existing climate-response models of arid environments and links tributary responses to the axial Rio Grande system throughout the central Rio Grande rift. The terrace chronology also reflects a transition from modest (60 m/m.y.) to rapid (300 m/m.y.) incision between 610 and 135 ka, similar to patterns observed throughout the Rio Grande rift and the western United States in general.
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000593263300006
WOS关键词	RESERVOIR FOSSIL SITE ; COSMOGENIC NUCLIDES ; ALBUQUERQUE BASIN ; CLIMATIC CONTROLS ; COLORADO PLATEAU ; SNOWMASS VILLAGE ; PLEISTOCENE ; EVOLUTION ; INCISION ; GEOMORPHOLOGY
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
来源机构	Desert Research Institute
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327697
作者单位	[Sion, Brad D.] Desert Res Inst, Div Earth & Ecosyst Sci, 2215 Raggio Pkwy, Reno, NV 89512 USA; [Sion, Brad D.; Phillips, Fred M.; Axen, Gary J.; Harrison, J. Bruce J.] New Mexico Inst Min & Technol, Dept Earth & Environm Sci, 801 Leroy Pl, Socorro, NM 87801 USA; [Love, David W.; Zimmerer, Matthew J.] New Mexico Inst Min & Technol, New Mexico Bur Geol & Mineral Resources, 801 Leroy Pl, Socorro, NM 87801 USA
推荐引用方式 GB/T 7714	Sion, Brad D.,Phillips, Fred M.,Axen, Gary J.,et al. Chronology of terraces in the Rio Grande rift, Socorro basin, New Mexico: Implications for terrace formation[J]. Desert Research Institute,2020,16(6):1457-1478.
APA	Sion, Brad D.,Phillips, Fred M.,Axen, Gary J.,Harrison, J. Bruce J.,Love, David W.,&Zimmerer, Matthew J..(2020).Chronology of terraces in the Rio Grande rift, Socorro basin, New Mexico: Implications for terrace formation.GEOSPHERE,16(6),1457-1478.
MLA	Sion, Brad D.,et al."Chronology of terraces in the Rio Grande rift, Socorro basin, New Mexico: Implications for terrace formation".GEOSPHERE 16.6(2020):1457-1478.