气候变化领域集成服务门户(CCPortal): Cryostratigraphy, sedimentology, and the late Quaternary evolution of the Zackenberg River delta, northeast Greenland

CCPortal

DOI	10.5194/tc-11-1265-2017
	Cryostratigraphy, sedimentology, and the late Quaternary evolution of the Zackenberg River delta, northeast Greenland
	Gilbert G.L.; Cable S.; Thiel C.; Christiansen H.H.; Elberling B.
发表日期	2017
ISSN	19940416
卷号	11 期号:3
英文摘要	The Zackenberg River delta is located in northeast Greenland (74°30′ N, 20°30′ E) at the outlet of the Zackenberg fjord valley. The fjord-valley fill consists of a series of terraced deltaic deposits (ca. 2 km2/ formed during relative sea-level (RSL) fall. We investigated the deposits using sedimentological and cryostratigraphic techniques together with optically stimulated luminescence (OSL) dating.We identify four facies associations in sections (4 to 22m in height) exposed along the modern Zackenberg River and coast. Facies associations relate to (I) overriding glaciers, (II) retreating glaciers and quiescent glaciomarine conditions, (III) delta progradation in a fjord valley, and (IV) fluvial activity and niveo-aeolian processes. Pore, layered, and suspended cryofacies are identified in two 20m deep ice-bonded sediment cores. The cryofacies distribution, together with low overall ground-ice content, indicates that permafrost is predominately epigenetic in these deposits. Fourteen OSL ages constrain the deposition of the cored deposits to between approximately 13 and 11 ka, immediately following deglaciation. The timing of permafrost aggradation was closely related to delta progradation and began following the subaerial exposure of the delta plain (ca. 11 ka). Our results reveal information concerning the interplay between deglaciation, RSL change, sedimentation, permafrost aggradation, and the timing of these events. These findings have implications for the timing and mode of permafrost aggradation in other fjord valleys in northeast Greenland. © The Authors 2017.
学科领域	aggradation; cyclic sedimentation; dating method; deglaciation; deltaic deposit; glacier retreat; permafrost; progradation; Quaternary; sea level change; sediment core; sedimentation; sedimentology; subaerial exposure; Arctic; Greenland; Zackenberg Basin
语种	英语
scopus关键词	aggradation; cyclic sedimentation; dating method; deglaciation; deltaic deposit; glacier retreat; permafrost; progradation; Quaternary; sea level change; sediment core; sedimentation; sedimentology; subaerial exposure; Arctic; Greenland; Zackenberg Basin
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119392
作者单位	Arctic Geology Department, University Centre in Svalbard, PO Box 156, Longyearbyen, 9170, Norway; Department of Earth Science, University of Bergen, Realfagbygget, Allegt. 41, Bergen, 5007, Norway; Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, Copenhagen, 1350, Denmark; Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, Aarhus University, Risø Campus, Roskilde, 4000, Denmark; Centre for Nuclear Technologies (Nutech), Technical University of Denmark, Risø Campus, Roskilde, 4000, Denmark; Leibniz Institute for Applied Geophysics, Section S3: Geochronology and Isotope Hydrology, Stilleweg 2, Hanover, 30655, Germany
推荐引用方式 GB/T 7714	Gilbert G.L.,Cable S.,Thiel C.,et al. Cryostratigraphy, sedimentology, and the late Quaternary evolution of the Zackenberg River delta, northeast Greenland[J],2017,11(3).
APA	Gilbert G.L.,Cable S.,Thiel C.,Christiansen H.H.,&Elberling B..(2017).Cryostratigraphy, sedimentology, and the late Quaternary evolution of the Zackenberg River delta, northeast Greenland.Cryosphere,11(3).
MLA	Gilbert G.L.,et al."Cryostratigraphy, sedimentology, and the late Quaternary evolution of the Zackenberg River delta, northeast Greenland".Cryosphere 11.3(2017).