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Exploring Isotopic Signatures of Lake El'gygytgyn Sediments for Evidence of Anoxia and Methane Cycling over the Past 50,000 Years
Exploring Isotopic Signatures Lake El'gygytgyn Sediments Evidence of Anoxia and Methane Cycling over the Past 50,000 Years
2014/10/21
Compound specific isotope analysis of lake sediments is a powerful tool in deciphering evidence of changing climatic and paleoenvironmental conditions through time. Isotopic analysis of Lake El’gygytg...
Evidence of Shock Metamorphism Effects in Allochthonous Breccia Deposits from the Colônia Crater, São Paulo, Brazil
Colô nia Crater Polymictic Allochthonous Breccia Shock Metamorphism Effects
2013/3/11
The 3.6 km-diameter Colonia impact crater, centred at 2352'03"S and 4642'27"W, lies 40 km to the south-west of the São Paulo city. The structure was formed on the crystalline basement rocks and d...
Geochemistry and Geochronology of Peraluminous High-K Granitic Leucosomes of Yaoundé Series (Cameroon): Evidence for a Unique Pan-African Magmatism and Melting Event in North Equatorial Fold Belt
Pan-African North-Equatorial Fold Belt Yaoundé Series
2013/3/8
Geochemical and geochronological studies have been carry out on the leucosomes of Yaoundé series with the aims to identify the magma sources and to indicate their production periods and emplacement wi...
Na-Metasomatism and Uranium Mineralization during a Two-Stage Albitization at Kitongo, Northern Cameroon: Structural and Geochemical Evidence
Uranium Kitongo Granite Albitization Strike Slip Fault Cameroon
2013/3/7
Mapping and documentation of lithological varieties and their corresponding geochemistry at the Kitongo uranium mineralization were concerned. The Kitongo U occurrence is hosted by granitic rocks that...
Geochronological Evidence of Pan-African Eclogites from the Central Menderes Massif, Turkey
Geochronological Evidence Pan-African Eclogites the Central Menderes Massif
2010/10/14
The Menderes Massif in western Anatolia documents a complex geodynamic history from Precambrian to recent. Eclogitic relics found in metagabbros in the Precambrian basement were dated by the U/Pb meth...
Mineral and Whole-rock Geochemistry of the Kestanbol Granitoid (Ezine-Çanakkale) and its Mafic Microgranular Enclaves in Northwestern Anatolia: Evidence of Felsic and Mafic Magma Interaction
Kestanbol granitoid magma mingling/mixing mafic microgranular enclave (MME) hybrid magma post-collision
2010/10/14
The Miocene Kestanbol granitoid, in Ezine-Çanakkale, Turkey, is one of post-collision granitoids of western Anatolia, which have been related to the the late Cretaceous collision between the An...
Seismic triggering of landslides,Part A:Field evidence from the Northern Tien Shan
Seismic triggering landslides Field evidence Northern Tien Shan
2009/12/11
Landslides triggered by strong earthquakes often caused most of the global damage and most of all casualties related to the events, such as shown by the M = 7.7 Peru earthquake in 1970, by the M = 7.6...
Evidence of microbial activity in siderite and calcite deposits on gastropod shells in Pliocene sand and clay beds from Lipovljani,Croatia
concretions fresh water diagenesis iron bacteria calcite siderite Pliocene Slavonia Croatia
2009/12/8
Freshwater Pliocene sand and clays found near Lipovljani in western Slavonia, Croatia, contain gastropods preserved by diagenetic mineral incrustations of alternating calcite and siderite. The geochem...
Climatic transitions in the Arctic as revealed by mineralogical evidence from the Upper Cenozoic sediments in the central Arctic Ocean and the Yermak Plateau
Climatic transitions mineralogical evidence Upper Cenozoic sediments central Arctic Ocean
2009/12/2
Mineralogical characteristics of the sediments can be used to evaluate critical climate transitions in the Arctic Ocean based on a close relationship between ice-sheet initiation, ice rafting and sea-...
Extensive local seabed disturbance,erosion and mass wasting on Alpha Ridge,Central Arctic Ocean:possible evidence for an extra-terrestrial impact?
local seabed disturbance Central Arctic Ocean possible evidence extra-terrestrial impact
2009/12/2
Sub-bottom sediments within a 200 x 600 km area on the crest and south slope (water depth 1200-2500 meter) of the submarine Alpha Ridge in the central Arctic Ocean have been locally disrupted down to ...
Net Loss of CaCO3 from a subtropical calcifying community due to seawater acidification:mesocosm-scale experimental evidence
CaCO3 subtropical calcifying community seawater acidification experimental evidence
2010/1/20
Acidification of seawater owing to oceanic uptake of atmospheric CO2 originating from human activities such as burning of fossil fuels and land-use changes has raised serious concerns regarding its ad...
Evidence for surface organic matter modulation of air-sea CO2 gas exchange
Evidence surface organic matter modulation air-sea CO2 gas exchange
2010/1/20
Air-sea CO2 exchange depends on the air-sea CO2 gradient and the gas transfer velocity (k), computed as a function of wind speed. Large discrepancies among relationships predicting k from wind suggest...
Evidence for a multi-species coccolith volume change over the past two centuries:understanding a potential ocean acidification response
multi-species coccolith volume change potential ocean acidification response
2010/1/18
Major questions surround the species-specific nature of coccolithophore calcification in response to rising atmospheric CO2 levels. Here we present CaCO3 particle volume distribution data from the coc...
North Pacific-wide spreading of isotopically heavy nitrogen during the last deglaciation:Evidence from the western Pacific
North Pacific-wide spreading isotopically heavy nitrogen Pacific
2010/1/18
Sedimentary δ15 N records in two IMAGES cores (MD012404 and MD012403) retrieved from the Okinawa Trough (OT) in the western North Pacific reveal deglacial increases with two peaks occurring during the...
Evidence of fractional-Brownian-motion-type asperity model for earthquake generation in candidate pre-seismic electromagnetic emissions
fractional-Brownian-motion-type asperity model earthquake generation candidate pre-seismic electromagnetic emissions
2009/12/30
Many aspects of earthquake generation still escape our full understanding. Observations of electromagnetic emissions preceding significant earthquakes provide one of the few cases of premonitory event...