干旱区生态环境知识资源中心(Arid): Multiproxy analysis of a Lateglacial-Holocene sedimentary section in the Fuegian steppe (northern Tierra del Fuego, Argentina): Implications for coastal landscape evolution in relation to climatic variability and sea-level fluctuations

Arid

DOI	10.1016/j.palaeo.2020.109941
	Multiproxy analysis of a Lateglacial-Holocene sedimentary section in the Fuegian steppe (northern Tierra del Fuego, Argentina): Implications for coastal landscape evolution in relation to climatic variability and sea-level fluctuations
	Soledad Candel, Maria; Esteban Diaz, Pablo; Maria Borromei, Ana; Fernandez, Marilen; Montes, Alejandro; Carlos Santiago, Fernando
通讯作者	Candel, MS
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
EISSN	1872-616X
出版年	2020
卷号	557
英文摘要	We report the sedimentology, palynology, geochemistry, and diatom assemblages of a well-dated succession at Laguna Las Vueltas (LV) on the Atlantic coast of the Fuegian steppe in southern Argentina. The multiproxy analysis offers a unique opportunity to study the evolution of this coastal landscape in relation to past sea level and climate changes in the southern high latitudes. After ca. 19,000 cal yr BP, the sediments were subjected to subaerial exposure and oxidation linked to a low sea level. The Sr/Ba ratio (a paleosalinity geochemical parameter) indicates variations in the water body level, and diatoms imply the existence of an ephemeral and brackish-freshwater body subject to desiccation under arid conditions. Between ca. 11,600 and 8500 cal yr BP, a shrubby steppe vegetation, mainly composed of Asteraceae subf. Asteroideae, spread over the coastal area associated with a shallow freshwater body and the deposition of fine-grained sediments in low-energy environments, all indicative of low effective moisture and warm climate conditions. Between ca. 8500 and 8100 cal yr BP, salt carpet vegetation, dominated by Chenopodiaceae, developed around a coastal lagoon in response to the Holocene marine transgression. The record of dinocysts and geochemical data indicate marine influence at this time. Between ca. 8100 and 7000 cal yr BP, salt marshes colonized the coastal area. A coastal lagoon with a more restricted connection to the sea and minor freshwater input are inferred, linked to the beginning of a regressive phase. After ca. 7000 cal yr BP, grassland vegetation and an open shrub stratum developed along with a shallow lake (pan) that was disconnected from the sea, following a fall in the sea level and regression. Fluctuations in the water level of the pan and changes in the physical-chemical conditions, as indicated by fluctuations in Mn/Fe, Ti/Ca, Rb/Sr, Ca, TIC and TOC, suggest abrupt events of desiccation and flooding. Between ca. 4500 and 2000 cal yr BP a drier phase is indicated by changes in vegetation, algal content and geochemistry of the pan. A grassland vegetation and a shallow lake with seasonal water level variations characterized the last 2000 years. Our results from LLV area match well with Andean forest fluctuations and regional climatic conditions recorded from Tierra del Fuego and Chilean southwest.
英文关键词	Pollen Non-pollen palynomorphs Geochemistry Diatoms Postglacial environmental changes Southern steppes
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000565723200013
WOS关键词	NON-POLLEN PALYNOMORPHS ; BEAGLE CHANNEL ; PALEOENVIRONMENTAL RECONSTRUCTION ; POSTGLACIAL VEGETATION ; DINOFLAGELLATE CYSTS ; SOUTHERN PATAGONIA ; HUNTER-GATHERERS ; LATE PLEISTOCENE ; HUMAN SETTLEMENT ; ATLANTIC COAST
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向	Physical Geography ; Geology ; Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326021
作者单位	[Soledad Candel, Maria; Fernandez, Marilen; Montes, Alejandro; Carlos Santiago, Fernando] Consejo Nacl Invest Cient & Tecn, Ctr Austral Invest Cient CADIC, B Houssay 200, RA-9410 Ushuaia, Argentina; [Esteban Diaz, Pablo; Maria Borromei, Ana] Univ Nacl Sur, Inst Geol INGEOSUR, CONICET, Ave Alem 1253 Cuerpo B,Piso 1,B8000CB, Buenos Aires, DF, Argentina; [Soledad Candel, Maria; Montes, Alejandro; Carlos Santiago, Fernando] Univ Nacl Tierra Fuego, Fuegia Basket 251, RA-9410 Ushuaia, Tierra Fuego, Argentina
推荐引用方式 GB/T 7714	Soledad Candel, Maria,Esteban Diaz, Pablo,Maria Borromei, Ana,et al. Multiproxy analysis of a Lateglacial-Holocene sedimentary section in the Fuegian steppe (northern Tierra del Fuego, Argentina): Implications for coastal landscape evolution in relation to climatic variability and sea-level fluctuations[J],2020,557.
APA	Soledad Candel, Maria,Esteban Diaz, Pablo,Maria Borromei, Ana,Fernandez, Marilen,Montes, Alejandro,&Carlos Santiago, Fernando.(2020).Multiproxy analysis of a Lateglacial-Holocene sedimentary section in the Fuegian steppe (northern Tierra del Fuego, Argentina): Implications for coastal landscape evolution in relation to climatic variability and sea-level fluctuations.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,557.
MLA	Soledad Candel, Maria,et al."Multiproxy analysis of a Lateglacial-Holocene sedimentary section in the Fuegian steppe (northern Tierra del Fuego, Argentina): Implications for coastal landscape evolution in relation to climatic variability and sea-level fluctuations".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 557(2020).