Atmosphere, Free Full-Text
Por um escritor misterioso
Descrição
The upland lakes (ULs) in Carajás, southeastern ia, have been extensively studied with respect to their high-resolution structural geology, geomorphology, stratigraphy, multielement and isotope geochemistry, palynology and limnology. These studies have generated large multiproxy datasets, which were integrated in this review to explain the formation and evolution of the ULs. These ULs evolved during the Pliocene–Pleistocene periods through several episodes of a subsidence of the lateritic crust (canga) promoted by fault reactivation. The resulting ULs were filled under wet/dry and warm/cool paleoclimatic conditions during the Pleistocene period. The multielement geochemical signature indicates that the detrital sediments of these ULs were predominantly derived from weathered canga and ferruginous soils, while the sedimentary organic matter came from autochthonous (siliceous sponge spicules, algae, macrophytes) and allochthonous (C3/C4 canga and forest plants and freshwater dissolved organic carbon) sources. Modern pollen rain suggests that even small ULs can record both the influence of canga vegetation and forest signals; thus, they can serve as reliable sites to provide a record of vegetation history. The integrated data from the sedimentary cores indicate that the active ULs have never dried up during the last 50 ka cal BP. However, subaerial exposure occurred in filled ULs, such as the Tarzan mountain range during the Last Glacial Maximum (LGM) and the Bocaína and S11 mountain ranges in the mid-Holocene period, due to the drier conditions. Considering the organic proxies, the expansion of C4 plants has been observed in the S11 and Tarzan ULs during dry events. Extensive precipitation of siderite in UL deposits during the LGM indicated drier paleoenvironmental conditions, interrupting the predominantly wet conditions. However, there is no evidence of widespread forest replacement by savanna in the Carajás plateau of southeastern ia during the late Pleistocene and Holocene.
Atmosphere Grotesk Font Family - Download Free Font
PDF) Atmosphere- Documentary
Free Vector Earth's atmosphere background
Atmosphere Without Text Labels Geography, Diagram, Free printables
Free Illustrations - The Image Portrays A Sky Filled With Fluffy White Clouds And Numerous Balloons Drifting Through The Atmosphere. The Clouds And Balloons Are Scattered Throughout The Scene, Creating A Playful
Atmosphere Grotesk Font Family - Download Free Font
VIADA - Our new vendor Atmosphere TV has a special
Addicted to Health: Going with God to Break Free from a Health-Obsessed Culture, by Victoria Davis
🪷 𝐋𝐎𝐘 𝐊𝐑𝐀𝐓𝐇𝐎𝐍𝐆 𝐅𝐄𝐒𝐓𝐈𝐕𝐀𝐋 🪷 Enjoy the enchanting atmosphere of Loy Krathong under the glow of the full moon, for a night of celestial beauty.…
Atmosphere An Open Access Journal from MDPI
Atmosphere Grotesk Font Family - Download Free Font
de
por adulto (o preço varia de acordo com o tamanho do grupo)
