FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W4200366354> ?p ?o ?g. }

• W4200366354 endingPage "103717" @default.
• W4200366354 startingPage "103717" @default.
• W4200366354 abstract "In the Miocene, a large wetland system extended from the Andean foothills into western Amazonia. This system has no modern analogue and the driving mechanisms are not yet fully understood. Dynamic topography and Andean uplift are thought to have controlled deposition, with allocyclic base level changes driven by eustasy and orbital forcing also playing a role. In this study we investigate the presumed orbital cyclicity that controlled sediment deposition, while also assessing sediment source and biomes in the Miocene wetland. We do this by integrating lithological, palynological, malacological and geochemical data from the Los Chorros site (Amazon River, Colombia), and by placing our data in a sequence stratigraphic framework. In this sequence biostratigraphic evaluation, the Los Chorros succession is visualized to be composed of a series of flood-fill packages, with a rapid initial flood, marine-influenced conditions at the time of maximum flood, followed by a longer regressive infill phase. Based on the palynology we could differentiate local vegetation, such as palm swamps, from regional origin such as terra firme vegetation (non-flooded Amazonian forest) and Andean montane forest, while from sediment geochemistry we could separate local and regional sediment sources. At the times of flooding, oligotrophic and eutrophic aquatic conditions alternatively characterized the wetland, as is shown by the presence of algae, floating ferns, and mollusc assemblages, while intervening subaquatic debris points to proximal submerged lowlands. In the lower 20 m of the section, marine influences are intermittently evident and shown by short-lived maxima of mangrove pollen, foraminiferal test linings, dinoflagellate cysts, coastal mollusc species, and an episodic decline in terrestrial biomarkers. The upper 5 m of the section is characterized by floodplain forest taxa with a diversity in tropical rain forest taxa and relatively few lacustrine indicators. These marine, mangrove, and lacustrine indicators suggest that the outcrops at Los Chorros represent predominant marine-influenced lacustrine conditions during periods of sea level highstand. The sequence biostratigraphic evaluation further points to eight 41 kyr obliquity-driven depositional cycles, with rapid phases of transgression. Mangrove elements would have colonised within the timeframe of each sea level rise. Based on this relative age constraint and comparison to regional records, deposition likely took place prior to the 13.8 Myr global sea level fall, and most likely during the period just after 14.5 Ma, between Middle Miocene Climatic Optimum (MMCO; 17–14 Ma) and Middle Miocene Climate Transition (MMCT; 14.7–13.8 Ma). Palynological evidence further suggests that to the west, surface elevation ranged from ~1000 up to ~3500 m and hosted protoparamo vegetation, the oldest yet reported and in agreement with predictions from molecular studies. In contrast, contemporaneous sites to the northeast of the wetland consisted of fluvial and cratonic formations, as shown by their Nd and Sr isotopic sediment signature. In summary, our data lead to an improved understanding of how geological and astronomical mechanisms controlled the floral and faunal distribution and controlled sediment deposition in western Amazonia during the middle Miocene. As Miocene conditions strongly contrast with modern western Amazonia, our data provide an important context for the deep time history and evolution of the modern western Amazon rainforest." @default.
• W4200366354 created "2021-12-31" @default.
• W4200366354 creator A5003143276 @default.
• W4200366354 creator A5003980611 @default.
• W4200366354 creator A5004504044 @default.
• W4200366354 creator A5016108712 @default.
• W4200366354 creator A5018204357 @default.
• W4200366354 creator A5020282158 @default.
• W4200366354 creator A5044186752 @default.
• W4200366354 creator A5048037835 @default.
• W4200366354 creator A5053103192 @default.
• W4200366354 creator A5069621379 @default.
• W4200366354 creator A5070163480 @default.
• W4200366354 creator A5071188819 @default.
• W4200366354 creator A5075036109 @default.
• W4200366354 creator A5088161094 @default.
• W4200366354 creator A5091510815 @default.
• W4200366354 date "2022-03-01" @default.
• W4200366354 modified "2023-10-18" @default.
• W4200366354 title "Cyclic sediment deposition by orbital forcing in the Miocene wetland of western Amazonia? New insights from a multidisciplinary approach" @default.
• W4200366354 cites W1529099308 @default.
• W4200366354 cites W1575419765 @default.
• W4200366354 cites W1880555926 @default.
• W4200366354 cites W1964765493 @default.
• W4200366354 cites W1968451170 @default.
• W4200366354 cites W1974051213 @default.
• W4200366354 cites W1975042776 @default.
• W4200366354 cites W1979381341 @default.
• W4200366354 cites W1988486349 @default.
• W4200366354 cites W1989182282 @default.
• W4200366354 cites W1991263091 @default.
• W4200366354 cites W1997584334 @default.
• W4200366354 cites W2001009068 @default.
• W4200366354 cites W2002715778 @default.
• W4200366354 cites W2005350578 @default.
• W4200366354 cites W2005832186 @default.
• W4200366354 cites W2009196203 @default.
• W4200366354 cites W2015918592 @default.
• W4200366354 cites W2024827286 @default.
• W4200366354 cites W2025466026 @default.
• W4200366354 cites W2029401070 @default.
• W4200366354 cites W2030456104 @default.
• W4200366354 cites W2036058707 @default.
• W4200366354 cites W2041904374 @default.
• W4200366354 cites W2044134956 @default.
• W4200366354 cites W2044420278 @default.
• W4200366354 cites W2046437868 @default.
• W4200366354 cites W2052327762 @default.
• W4200366354 cites W2054713354 @default.
• W4200366354 cites W2055639221 @default.
• W4200366354 cites W2062444601 @default.
• W4200366354 cites W2063319246 @default.
• W4200366354 cites W2065791536 @default.
• W4200366354 cites W2067812732 @default.
• W4200366354 cites W2068365898 @default.
• W4200366354 cites W2073426602 @default.
• W4200366354 cites W2073551687 @default.
• W4200366354 cites W2073889844 @default.
• W4200366354 cites W2074748074 @default.
• W4200366354 cites W2078140135 @default.
• W4200366354 cites W2080465564 @default.
• W4200366354 cites W2082462029 @default.
• W4200366354 cites W2084205529 @default.
• W4200366354 cites W2087385935 @default.
• W4200366354 cites W2089069736 @default.
• W4200366354 cites W2090062577 @default.
• W4200366354 cites W2097790894 @default.
• W4200366354 cites W2098839785 @default.
• W4200366354 cites W2099260783 @default.
• W4200366354 cites W2103160998 @default.
• W4200366354 cites W2109161091 @default.
• W4200366354 cites W2109913185 @default.
• W4200366354 cites W2112184907 @default.
• W4200366354 cites W2121361055 @default.
• W4200366354 cites W2127633016 @default.
• W4200366354 cites W2128168320 @default.
• W4200366354 cites W2130786921 @default.
• W4200366354 cites W2138717680 @default.
• W4200366354 cites W2141459972 @default.
• W4200366354 cites W2141946675 @default.
• W4200366354 cites W2147450153 @default.
• W4200366354 cites W2149202575 @default.
• W4200366354 cites W2149255324 @default.
• W4200366354 cites W2149761807 @default.
• W4200366354 cites W2152902450 @default.
• W4200366354 cites W2155139989 @default.
• W4200366354 cites W2156942283 @default.
• W4200366354 cites W2160126428 @default.
• W4200366354 cites W2161013935 @default.
• W4200366354 cites W2168788553 @default.
• W4200366354 cites W2262763616 @default.
• W4200366354 cites W2300722901 @default.
• W4200366354 cites W2405679845 @default.
• W4200366354 cites W2423937459 @default.
• W4200366354 cites W2519008584 @default.
• W4200366354 cites W2587958876 @default.
• W4200366354 cites W2603762175 @default.
• W4200366354 cites W2611608464 @default.

• next