Results 1 to 10 of about 1,647,655 (410)

Isotopically “heavy” pyrite in marine sediments due to high sedimentation rates and non-steady-state deposition

open access: yesGeology, 2021
Sedimentary pyrite formation links the global biogeochemical cycles of carbon, sulfur, and iron, which, in turn, modulate the redox state of the planet’s surficial environment over geological time scales.
Jiarui Liu, E. al.
semanticscholar   +1 more source

Dust storm hazards [PDF]

open access: yesE3S Web of Conferences, 2019
Dust storms originate in many of the world's drylands and frequently present hazards to human society, both within the drylands themselves but also outside drylands due to long-range transport of aeolian sediments.
Middleton Nick
doaj   +1 more source

Trends and Composition—A Sedimentological-Chemical-Mineralogical Approach to Constrain the Origin of Quaternary Deposits and Landforms—From a Review to a Manual

open access: yesGeosciences, 2022
In this study, six basic Quaternary landform series (LFS) and their sedimentary deposits (LFS1 aeolian, LFS 2.1 to 2.2 mass wasting, LFS 3 cryogenic-glacial, LFS 4.1 to 4.6 fluvial, LFS 5.1 to 5.2 coastal-marine, LFS 6.1 to 6.3 lacustrine) are subdivided
Harald G. Dill
doaj   +1 more source

Incipient Wolframite Deposition at Panasqueira (Portugal): W-Rich Rutile and Tourmaline Compositions as Proxies for the Early Fluid Composition

open access: yesEconomic Geology, 2020
The main event responsible for the deposition of tungsten at Panasqueira was closely associated with strong tourmalinization of the wall rocks.
Eleonora Carocci   +6 more
semanticscholar   +1 more source

Interpretation of paleoenvironment using benthic foraminifera from Tertiary rocks, northern Sarawak [PDF]

open access: yesMATEC Web of Conferences, 2023
In this work, we collected and examined three samples from an exposed 50 cm thick fossiliferous bed and prepared thin and polished sections for petrographic analysis.
Dayong Vivian, Nagarajan Ramasamy
doaj   +1 more source

Evaporite weathering and deposition as a long-term climate forcing mechanism

open access: yesGeology, 2020
Although it is widely accepted that Earth’s long-term surface temperature is regulated by the mutual dependence of silicate weathering and climate on CO2, the root causes of some climatic events remain unresolved.
G. Shields, Benjamin J. W. Mills
semanticscholar   +1 more source

Estimation of Erosion Intensity and Sedimentation of Ivar Watershed Using MPSIAC Empirical Methods [PDF]

open access: yesجغرافیا و توسعه, 2016
Erosion and sedimentation is one of the major problems in the management of watersheds  of the country. Erosion and its resulting consequences, by  increasing the human utilization  of the nature from the  early times of the  twentieth century, has ...
Hamid Alipour   +3 more
doaj   +1 more source

LAGO AMAZONAS: FACT OR FANCY? [PDF]

open access: yesActa Amazonica, 1992
It has been suggested that a huge lake, Lago Amazonas, covered a large part of the Amazon basin until as recently as two thousand years ago. According to this hypothesis, the topmost sediments in western Amazonia are almost universally young deposite of ...
Hanna Tuomisto   +2 more
doaj   +1 more source

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