干旱区生态环境知识资源中心(Arid): Paleoclimate of the subtropical Andes during the latest Miocene, Lauca Basin, Chile

Arid

DOI	10.1016/j.palaeo.2019.109336
	Paleoclimate of the subtropical Andes during the latest Miocene, Lauca Basin, Chile
	Feitl, Melina 1; Kern, Andrea K.2; Jones, Amanda 1; Fritz, Sherilyn C.3; Baker, Paul A.4; Joeckel, R. M.5,7; Salenbien, Wout 4; Willard, Debra 6
通讯作者	Feitl, Melina
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
EISSN	1872-616X
出版年	2019
卷号	534
英文摘要	Uplift of the Andean Cordillera during the Miocene and Pliocene produced large-scale changes in regional atmospheric circulation that impacted local ecosystems. The Lauca Basin (northern Chilean Altiplano) contains variably fluvial and lacustrine sedimentary sequences spanning the interval from 8.7 to 2.3 Ma. Field samples were collected from paleo-lacustrine sediments in the basin. Sediments were dated using detrital zircon geochronology on volcanic tuffs, yielding an age range between similar to 5.57 and 5.44 Ma. These new age constraints provided an opportunity to evaluate changes in the Lauca Basin ecosystem across this dynamic Miocene-Pliocene transition. We employed multiple proxies (lithofacies analysis, diatoms, pollen, and oxygen stable isotopes of authigenic carbonates) to interpret ancient lacustrine and terrestrial paleoenvironments. Alternations among mudstone, carbonate, and evaporitic facies indicate lake-level variability through time. The diatom assemblage is characterized by meso- to hypersaline and alkaline-tolerant taxa typical of shallow lakes. The delta O-18 values ranged from -8.96 to -2.22 parts per thousand indicating fluctuations in water balance. Pollen taxa in the outcrop are typical of a transitional stage between seasonal cloud forest and open grassland. Together, these proxies indicate that the Lauca paleolake sediments were deposited under a wetter-than-modem climate with high temporal variability. Our results refine previous studies in the Lauca Basin and are consistent with other regional studies suggesting that the South American summer monsoon at the Miocene-Pliocene transition was more intense than it is at present.
英文关键词	Paleolimnology Paleolake Paleoenvironments Altiplano
类型	Article
语种	英语
国家	USA ; Brazil
收录类别	SCI-E
WOS记录号	WOS:000504504200024
WOS关键词	MODERN POLLEN RAIN ; NORTHERN CHILE ; BOLIVIAN ALTIPLANO ; LACUSTRINE RECORD ; WESTERN ALTIPLANO ; STABLE-ISOTOPES ; ATACAMA DESERT ; CLIMATE-CHANGE ; FORE-ARC ; UPLIFT
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向	Physical Geography ; Geology ; Paleontology
EI主题词	2019-11-15
来源机构	United States Geological Survey
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310888
作者单位	1.Univ Nebraska, Dept Earth & Atmospher Sci, Lincoln, NE 68588 USA; 2.Univ Sao Paulo, Dept Sedimentary & Environm Geol, Sao Paulo, SP, Brazil; 3.Univ Nebraska, Sch Biol Sci, Dept Earth & Atmospher Sci, Lincoln, NE 68588 USA; 4.Duke Univ, Div Earth & Ocean Sci, Durham, NC 27708 USA; 5.Univ Nebraska, Dept Earth & Atmospher Sci, Sch Nat Resources, Conservat & Survey Div, Lincoln, NE 68588 USA; 6.USGS, Climate Res & Dev, Reston, VA 20192 USA; 7.Univ Nebraska, State Museum, Lincoln, NE 68588 USA
推荐引用方式 GB/T 7714	Feitl, Melina,Kern, Andrea K.,Jones, Amanda,et al. Paleoclimate of the subtropical Andes during the latest Miocene, Lauca Basin, Chile[J]. United States Geological Survey,2019,534.
APA	Feitl, Melina.,Kern, Andrea K..,Jones, Amanda.,Fritz, Sherilyn C..,Baker, Paul A..,...&Willard, Debra.(2019).Paleoclimate of the subtropical Andes during the latest Miocene, Lauca Basin, Chile.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,534.
MLA	Feitl, Melina,et al."Paleoclimate of the subtropical Andes during the latest Miocene, Lauca Basin, Chile".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 534(2019).