Journal ArticleDOI
Argon-40/argon-39 age of the El'gygytgyn impact event, Chukotka, Russia
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In this article, the authors used step-heating to identify inherited Ar in the samples due to incomplete degassing of the Cretaceous volcanic rocks during impact melting, which is consistent with, but more precise than, previous K-Ar and fission track ages.Abstract:
of 3.58 2 0.04 Ma. The Ar step-heating method was critical in this study in identifying inherited Ar in the samples due to incomplete degassing of the Cretaceous volcanic rocks during impact melting. This age is consistent with, but more precise than, previous K-Ar and fission-track ages and indicates an "instantaneous" formation of the crater. This tight age control, in conjunction with the presence of impactites, shocked quartz, and other features, is consistent with an impact origin for the structure and seems to discount internal (volcanogenic) origin models.read more
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2.8 Million Years of Arctic Climate Change from Lake El’gygytgyn, NE Russia
Martin Melles,Julie Brigham-Grette,Pavel S Minyuk,Norbert R. Nowaczyk,Volker Wennrich,Robert M. DeConto,Patricia M. Anderson,Andrei Andreev,Anthony Coletti,Timothy L Cook,Eeva Haltia-Hovi,Maaret Kukkonen,Anatoli V. Lozhkin,Peter Rosén,Pavel E. Tarasov,Hendrik Vogel,Bernd Wagner +16 more
TL;DR: A 2.8-million-year record of Arctic climate is developed using a sediment core from a lake in northeastern Russia that was formed more than 3.5 million years ago by a meteorite impact, suggesting strong interhemispheric climate connectivity.
Journal ArticleDOI
Pliocene Warmth, Polar Amplification, and Stepped Pleistocene Cooling Recorded in NE Arctic Russia
Julie Brigham-Grette,Martin Melles,Pavel S Minyuk,Andrei Andreev,Pavel E. Tarasov,Robert M. DeConto,S. J. Koenig,Norbert R. Nowaczyk,Volker Wennrich,Peter Rosén,Eeva Haltia,Timothy L Cook,Catalina Gebhardt,Carsten Meyer-Jacob,Jeff Snyder,Ulrike Herzschuh +15 more
TL;DR: Data from Lake El'gygytgyn, in northeast Arctic Russia, is presented that shows how climate varied between 3.6 and 2.2 million years ago, an important interval in the global cooling trend that accelerated rapidly at the end of the Miocene.
Journal ArticleDOI
High-pressure metamorphism in the Aegean, eastern Mediterranean: Underplating and exhumation from the Late Cretaceous until the Miocene to Recent above the retreating Hellenic subduction zone
Uwe Ring,Paul W. Layer +1 more
TL;DR: In this article, the authors reported 40Ar/39Ar ages from various tectonic units in the Aegean and westernmost Turkey, and they proposed that distinct stages of high pressure metamorphism were controlled by the underthrusting of fragments of mainly thinned continental crust and that these punctuated events were superposed on progressive slab retreat.
Journal ArticleDOI
Post-collisional transition from calc-alkaline to alkaline magmatism during transcurrent deformation in the southernmost Dom Feliciano Belt (Braziliano-Pan-African, Uruguay)
TL;DR: In the southernmost Dom Feliciano Belt of Uruguay, highly fractionated calc-alkaline granites, mildly alkaline granite, shoshonitic volcanics, and peralkaline intrusions and volcanics are spatially and temporal associated with the evolution of shear zones as mentioned in this paper.
Journal ArticleDOI
Sedimentary geochemistry of core PG1351 from Lake El’gygytgyn—a sensitive record of climate variability in the East Siberian Arctic during the past three glacial–interglacial cycles
Martin Melles,Julie Brigham-Grette,Olga Glushkova,Pavel S Minyuk,Norbert R. Nowaczyk,Hans-W. Hubberten +5 more
TL;DR: In this article, a ca. 13m long sediment core from the central part of Lake Elgygygytgyn, NE Siberia, was investigated for lithostratigraphy, water content, dry bulk density (DBD), total organic carbon (TOC), total nitrogen (TN), total sulphur (TS) and biogenic silica (opal) contents, and for TOC stable isotope ratios (δ13CTOC).
References
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Journal ArticleDOI
Subcommission on geochronology: Convention on the use of decay constants in geo- and cosmochronology
R.H. Steiger,E. Jäger +1 more
TL;DR: The IUGS Subcommission on Geochronology (FOOTNOTE 4) as discussed by the authors recommended the adoption of a standard set of decay constants and isotopic abundances in isotope geology.
Journal Article
Calibration of the interlaboratory 40Ar-39Ar dating standard, MMhb-1
Scott D. Samson,E. C. Alexander +1 more
Journal ArticleDOI
The derivation of 40Ar/39Ar age spectra of single grains of hornblende and biotite by laser step-heating
TL;DR: In this paper, the authors presented the first examples of 40Ar/39Ar age spectra for hornblende and biotite derived by the laser step-heating of individual grains.
Journal ArticleDOI
Impact structures of northeastern Eurasia: The territories of Russia and adjacent countries
TL;DR: More than 30 impact structures have been discovered in the last three decades in northeastern Eurasia, which includes Russia, Ukraine, Belarus, Lithuania, Latvia, Estonia, Kazakhstan, and Mongolia as mentioned in this paper.
Journal ArticleDOI
New ages for the climactic eruptions at Yellowstone: Single-crystal 40Ar/39Ar dating identifies contamination
TL;DR: In this article, the ages of sanidine grains from the Huckleberry Ridge Tuff, Mesa Falls Tuff and member B of the Lava Creek Tuff were determined by laser-fusion 40Ar/39Ar dating.
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