By Saulo Rodrigues-Filho
Mineralogical-sedimentological and geochemical investigations together with pollen information of a 12.7-m-long dated sediment middle from Lake Silvana, SE Brazil, let the reconstruction of the climatic background over the last 10,000 years. The lowermost part (I) displays a rough paleosol-type sediment with ample plant particles and rootlets; pollen shows grassland plants. part II represents fine-grained lake sediments; pollen exhibits a savanna-like plants. part III represents a pollen-free, coarse-grained allogenic sediment deposited less than excessive transportation strength (increased precipitation). part IV, a greenish series with expanding C content material in the direction of the pinnacle, has a pollen spectrum of present-day plants (semideciduous forest). the various sediment sections exhibit a reference to erosional stages within the catchment of the lake, in accordance with mineralogy and geochemistry, that are a reaction to weather improvement.
Read or Download A Holocene Sedimentary Record from Lake Silvana, Se Brazil: Evidence for Paleoclimatic Changes from Mineral, Trace-Metal, and Pollen Data (Lecture Notes in Earth Sciences) PDF
Best paleontology books
During this superbly illustrated usual heritage that hyperlinks extinct greater tom cat species with these nonetheless in lifestyles, collaborators Alan Turner and Mauricio Anton weave jointly the proof of recent pussycat habit with that of the fossil list. Turner's transparent, insightful prose and Anton's masterly illustrations mix to supply experts and novices alike a correct and available advisor to the evolution of cats.
This booklet presents a accomplished therapy of all of the Pleistocene species in Europe, categorized based on smooth taxonomic ideas. for every species there's a description of its descent and migration background, its variety, and its mode of existence. the 1st model of this ebook was once a semipopular paperback within the Swedish Aldus sequence.
The distinguished Solnhofen limestone is one of the most crucial fossil deposits due to its striking range of organisms, many exquisitely preserved. This e-book illustrates a number of the marine and terrestrial creatures and vegetation, buried a hundred and fifty million years in the past in gentle lagoonal muds, to supply a distinct glimpse into the genuine range of Jurassic existence.
Sixty-five million years in the past, a comet or asteroid better than Mount Everest slammed into the Earth, inducing an explosion akin to the detonation of 100 million hydrogen bombs. Vaporized detritus blasted during the surroundings upon effect, falling again to Earth world wide. Disastrous environmental results ensued: a tremendous tsunami, continent-scale wildfires, darkness, and chilly, via sweltering greenhouse warmth.
- Late Palaeozoic and Mesozoic ecosystems in SE Asia
- Hominin Environments in the East African Pliocene: An Assessment of the Faunal Evidence
- Evolution of Island Mammals: Adaptation and Extinction of Placental Mammals on Islands
- Mesozoic stratigraphy and Jurassic paleontology west of Harrison Lake, southwestern British Columbia
- Paleogene mammals
- Flowering Plant Origin, Evolution & Phylogeny
Extra info for A Holocene Sedimentary Record from Lake Silvana, Se Brazil: Evidence for Paleoclimatic Changes from Mineral, Trace-Metal, and Pollen Data (Lecture Notes in Earth Sciences)
14). High Fe contents are probably derived from the decomposition of mafic minerals found in the parent rock. Petrographically, the occurrence of Fe oxyhydroxides and poorly ordered kaolinite as pseudomorphs after biotite could be observed. The ordering degree of kaolinite was determined through X-ray diffractograms, which clearly show two different patterns for poorly and well ordered kaolinite (Fig. 15). The strong displacement of the b-axis in poorly ordered kaolinite appears related to the water activity, as its occurrence is restricted to the surface horizon (colluvial unit) and to the C2 horizon, located near the groundwater table.
A total of 72 sub-samples were taken at I 0or 20-cm-intervals. One-meter-long core sections were carefully extruded and sealed in PVC tubes - with the same diameter as the core - for transportation to the Institute of Environmental Geochemistry at the University of Heidelberg, Germany. 1 Coring platform - core SB 1. 5 meters could be sampled. Sampling points within the weathering profile, which may reach a thickness of 30 meters, were selected according to changes in macroscopic features, such as color, texture and pedological and lithological structure.
0 . 22 10 28 30 75 143 EG1/ColI. 1 . 5 32 73,5 113 EG 1/Co11. 2 . 15 8 26 14 35 75 EG1/ColI. 4 o - ° . -- not measured A light increase in Fe, Ti and Cr concentrations were also observed in the colluvial unit relative to the B horizon. , 1979). Both the weathering degree and the composition of the parent rock are controlling the metal distribution within the weathering profile EG2, with the possible exception of Hg. The increase in gibbsite contents at the surface, in this case accompanied by elevated Hg concentrations, is a typical 55 picture of highly leached soils.
A Holocene Sedimentary Record from Lake Silvana, Se Brazil: Evidence for Paleoclimatic Changes from Mineral, Trace-Metal, and Pollen Data (Lecture Notes in Earth Sciences) by Saulo Rodrigues-Filho