Results 101 to 110 of about 156,667 (215)

A database of detrital zircon U–Pb ages and Hf isotopic compositions from the Tarim, West Kunlun, Pamir, Tajik and Tianshuihai terranes

open access: yesGeoscience Data Journal
With 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

open access: yesThe Astrophysical Journal Letters
The 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

U-Pb zircon age of volcaniclastic layers in Middle Triassic platform carbonates of the Austroalpine Silvretta nappe (Switzerland) [PDF]

open access: yes, 2018
We present precise U-Pb age determinations from two volcaniclastic layers within Middle Triassic carbonates in the Upper Austroalpine Silvretta nappe near Davos (Switzerland).
Furrer, Heinz   +3 more
core  

Trace element chemistry and U-Pb dating of zircons from oceanic gabbros and their relationship with whole rock composition (Lanzo, Italian Alps) [PDF]

open access: yes, 2018
The U-Pb ages and the trace element content of zircon U-Pb along with major and trace element whole rock data on gabbroic dikes from the Lanzo lherzolitic massif, N-Italy, have been determined to constrain crustal accretion in ocean-continent transition ...
Kaczmarek, M.-A   +2 more
core  

Detrital zircon U–Pb ages and Hf isotope analyses of modern and Quaternary sediments in China: A new dataset with preliminary analysis

open access: yesGeoscience Data Journal
Developments of detrital zircon geochronology have resulted in an explosion of publications that report or discuss detrital zircon data. Combined detrital zircon U–Pb ages with Hf isotope analyses from modern and Quaternary sediments have been widely ...
Xiyun Chen   +5 more
doaj   +1 more source

Sedimentary record of the amalgamation and break-up of Pangaea: U-Pb detrital zircon geochronology and provenance of Carboniferous-Triassic siliciclastic rocks (SW Iberia) [PDF]

open access: yes, 2014
In SW Iberia there is a basal unconformity where Triassic sandstones overlie previously deformed Carboniferous turbidites. This important stratigraphic boundary records the transition from the final stages of Pangaea’s amalgamation to the initial stages ...
Albardeiro, Luis   +8 more
core  

High-precision U-Pb data and reference age for Emerald Lake apatite

open access: yesData in Brief
New isotope dilution thermal ionization mass spectrometry U-Pb data for Emerald Lake apatite demonstrate its potential as a reference material for geochronology. A three-dimensional 238U/206Pb-207Pb/206Pb-204Pb/206Pb isochron produces a 95.2 ± 1.1 Ma date with an initial Pb isotopic composition of 206Pb/204Pb = 18.85 ± 0.19 and 207Pb/204Pb = 15.68 ± 0 ...
Francisco E. Apen   +2 more
openaire   +2 more sources

Detrital zircon–apatite fingerprinting challenges glacial transport of Stonehenge’s megaliths

open access: yesCommunications Earth & Environment
How Stonehenge’s building blocks arrived on Salisbury Plain remains debated, with glacial and human transport mechanisms proposed. Here we test the possibility of Pleistocene glacial sediment input using grain-scale U–Pb fingerprinting of detrital zircon
Anthony J. I. Clarke   +1 more
doaj   +1 more source

Evidence formulti-cycle sedimentation and provenance constraints from [PDF]

open access: yes, 2016
Laser ablation ICP-MS U–Pb analyses were conducted on detrital zircons of Triassic sandstone and conglomerate from the Lusitanian basin in order to: i) document the age spectra of detrital zircon; ii) compare U–Pb detrital zircon ages with previous ...
Chichorro, Martim   +7 more
core  

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