干旱区生态环境知识资源中心(Arid): Pliocene short-term climate changes preserved in continental shallow lacustrine-palustrine carbonates: Western Opache Formation, Atacama Desert, Chile

Arid

DOI	10.1130/B35227.1
	Pliocene short-term climate changes preserved in continental shallow lacustrine-palustrine carbonates: Western Opache Formation, Atacama Desert, Chile
	de Wet, Carol B.; de Wet, Andrew P.; Godfrey, Linda; Driscoll, Elizabeth; Patzkowsky, Samuel; Xu, Chi; Gigliotti, Sophia; Feitl, Melina
通讯作者	de Wet, CB
来源期刊	GEOLOGICAL SOCIETY OF AMERICA BULLETIN
ISSN	0016-7606
EISSN	1943-2674
出版年	2020
卷号	132 期号:9-10 页码:1795-1816
英文摘要	Multiple climate proxies indicate episodic changes in moisture levels within an similar to 1 Ma duration (early-mid Pliocene) interval. Limestones within the Opache Formation, Calama Basin, Atacama Desert region, Chile, contain evidence for wetter and drier periods on short time scales. Proxies include carbonate lithological changes, paleontology (stromatolites, oncolites, gastropods, ostracods and diatoms), O and C stable isotopes, geochemistry, and mineralogical changes (aragonite, calcite, Mg-calcite, dolomite and gypsum) throughout a 30 m stratigraphic section. Stromatolite fossil cyanobacteria dark and light laminations and mesohaline to hypersaline diatom species suggest Pliocene annual seasonality. Short-term changes between wetter and drier conditions indicate that at least this part of the Atacama region was experiencing relatively rapid early-mid Pliocene climate instability. The predominance of limestone in the Opache Formation, in contrast to the 1500 m of Oligocene-Miocene siliciclastic conglomerates and sandstones, interpreted as arid climate alluvium, that underlie it, indicates a shift from arid or hyperarid climate to a semi-arid climate. Semi-arid conditions promoted limestone deposition in a shallow lacustrine-palustrine environment. In this setting, events such as storms with associated surface water flow, erosion, siliciclastic sand, gravel, and intraclast deposition, coupled with significant biological activity, represent sedimentation during more humid periods in a shallow lacustrine depositional environment. In contrast, limestone characterized by mudcracks, Navicula diatoms, and vadose syndepositional cementation, reflect periods of enhanced evaporation, water shallowing, and episodic desiccation, characteristic of a palustrine depositional system. These facies shifts, in conjunction with geochemical and isotopic proxy evidence, yield a sedimentary record of wetter and drier climate shifts.
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000565754100001
WOS关键词	GREEN RIVER FORMATION ; WILKINS PEAK MEMBER ; NORTHERN CHILE ; FRESH-WATER ; CALAMA BASIN ; MARCH 2015 ; FORE-ARC ; MICROBIAL CARBONATES ; COSMOGENIC HE-3 ; STABLE-ISOTOPES
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326022
作者单位	[de Wet, Carol B.; de Wet, Andrew P.; Driscoll, Elizabeth; Patzkowsky, Samuel; Gigliotti, Sophia] Franklin & Marshall Coll, Dept Earth & Environm, Lancaster, PA 17604 USA; [Godfrey, Linda] Rutgers State Univ, Dept Earth & Planetary Sci, Piscataway, NJ 08854 USA; [Xu, Chi] Yale Univ, Yale Sch Forestry & Environm Studies, New Haven, CT 06511 USA; [Feitl, Melina] Univ Nebraska, Dept Earth & Atmospher Sci, Lincoln, NE 68599 USA
推荐引用方式 GB/T 7714	de Wet, Carol B.,de Wet, Andrew P.,Godfrey, Linda,et al. Pliocene short-term climate changes preserved in continental shallow lacustrine-palustrine carbonates: Western Opache Formation, Atacama Desert, Chile[J],2020,132(9-10):1795-1816.
APA	de Wet, Carol B..,de Wet, Andrew P..,Godfrey, Linda.,Driscoll, Elizabeth.,Patzkowsky, Samuel.,...&Feitl, Melina.(2020).Pliocene short-term climate changes preserved in continental shallow lacustrine-palustrine carbonates: Western Opache Formation, Atacama Desert, Chile.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,132(9-10),1795-1816.
MLA	de Wet, Carol B.,et al."Pliocene short-term climate changes preserved in continental shallow lacustrine-palustrine carbonates: Western Opache Formation, Atacama Desert, Chile".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 132.9-10(2020):1795-1816.