Timing of diagenesis and very low-grade metamorphism in the eastern sector of the Sierra de Cameros (Iberian Range, Spain): a U–Pb SHRIMP study on monazite [PDF]
, 2009 The Sierra de Cameros is an intracontinental orogen and represents the north-western part of the Iberian Range in Northern Spain. It comprises a thick sequence of syn-rift continental sediments (mainly sandstones and carbonates) deposited during ...
Aleinikoff +42 more
core +2 more sources
Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraints [PDF]
, 2017 The Santa Eulália-Monforte massif is a post-kinematic late Carboniferous-early Permian (LC-EP) located in the Ossa-Morena Zone (Portugal). This paper examines field relationships between calc-alkaline pinkish granites and mafic-intermediate rocks from ...
Gama, Cristina +2 more
core +5 more sources
Geochemical and geochronological constraints on the geologic evolution of the western Sonobari Complex, northwestern Mexico [PDF]
, 2013 In the southern Sierra Sonobari, NW Mexico, U-Pb and 40Ar/39Ar geochronology studies allowed to define the provenance and maximum depositional age of the Francisco Gneiss basement of the Sonobari terrane, and to establish the age of some magmatic events ...
Gómez-Juárez, O.S. +5 more
core +3 more sources
Archaean crustal evolution in eastern Finland : New geochronological and geochemical constraints from the Kuhmo terrain and the Nurmes belt [PDF]
, 2007 This thesis summarises the results of four original papers concerning U-Pb geochronology and geochemical evolution of Archaean rocks from the Kuhmo terrain and the Nurmes belt, eastern Finland.
Käpyaho, Asko
core
Extent and character of early tertiary penetrative deformation, Sonora, Northwest Mexico [PDF]
Reconnaissance field work has led to the recognition of extensive Early Tertiary gneiss and schist which are distinguished by weakly developed to highly conspicous northeast to east-trending stretching lineation commonly accompanied by low-dipping ...
Anderson, T. H.
core +1 more source
Re-Os and Pb-Pb geochronology of the Archean Salobo iron oxide copper-gold deposit, Carajás mineral province, northern Brazil [PDF]
, 2018 Rhenium-osmium ages were determined for two molybdenite samples and a Pb-Pb age was derived from bornite-chalcopyrite-magnetite at the Salobo iron oxide copper-gold deposit to determine the timing of mineralization and its relation to the nearby Old ...
Chiaradia, Massimo +3 more
core
U-Pb, Re-Os, and 40Ar/39Ar geochronology of the Nambija Au-skarn and Pangui porphyry Cu deposits, Ecuador: implications for the Jurassic metallogenic belt of the Northern Andes [PDF]
, 2018 New U-Pb, Re-Os, and 40Ar/39Ar dates are presented for magmatic and hydrothermal mineral phases in skarn- and porphyry-related ores from the Nambija and Pangui districts of the Subandean zone, southeastern Ecuador.
Chiaradia, Massimo +8 more
core
Late Paleozoic oxygenation of marine environments supported by dolomite U-Pb dating
Nature CommunicationsUnderstanding causal relationships between evolution and ocean oxygenation hinges on reliable reconstructions of marine oxygen levels, typically from redox-sensitive geochemical proxies.
Michal Ben-Israel +5 more
doaj +1 more source
Geoscience Data JournalWith the development of detrital zircon U–Pb ages and Hf isotope analysis as conventional sedimentological research methods, a large number of studies have been conducted in the Tarim, West Kunlun, Tajik, Pamir and Tianshuihai regions and abundant data ...
Shijie Zhang +6 more
doaj +1 more source
Meteorite Radioisotope Ages Reveal Late Dynamical Chaos in the Solar System
The Astrophysical Journal LettersThe orbital elements of the solar system’s ancient asteroid families are highly dispersed, recording the last dynamical chaos in its history. However, dynamics alone cannot precisely date this when this terminal chaos occurred.
Craig R. Walton +8 more
doaj +1 more source