Results 191 to 200 of about 4,931 (238)

The connection between hydrothermal fluids, mineralization, tectonics and magmatism in a continental rift setting: Fluorite Sm-Nd and hematite and carbonates U-Pb geochronology from the Rhinegraben in SW Germany

Geochimica et Cosmochimica Acta, 2018
Understanding the physical basics of tectonic events, related fluid flow and ore deposition represents one of the great challenges in modern geosciences.
B. Walter, A. Gerdes, I. Kleinhanns, I. Dunkl, H. Eynatten, S. Kreissl, G. Markl   +6 more
semanticscholar   +1 more source

U–Pb geochronology of the Coldwell Complex, northwestern Ontario, Canada

Canadian Journal of Earth Sciences, 1985
The Coldwell Complex gives a U–Pb zircon age of 1188 ± 56 Ma, a U–Pb tritomite age of 1126 ± 6 Ma, and a Pb–Pb potash feldspar age of 1139 ± 55 Ma. These ages are all significantly older than the previously published Rb–Sr and K–Ar ages. We interpret these ages as follows: (1) emplacement of the complex at 1188 Ma as part of the initial stages of the ...
A. Turek, Patrick E. Smith, D. T. A. Symons   +2 more
openaire   +1 more source

Alpha-recoil in U?Pb geochronology: effective sample size matters

Contributions to Mineralogy and Petrology, 2003
Displacement of the daughter isotope by α-recoil results in an open system on the nanoscale. For a heterogeneous distribution of U and Th, this redistribution of intermediate and stable daughter isotopes results in subvolumes with a deficit of Pb and others with an excess of Pb.
openaire   +2 more sources

An improved micro-capsule for zircon dissolution in UPb geochronology

Chemical Geology: Isotope Geoscience section, 1987
A new design of Teflon® micro-capsule for mineral dissolution is described which offers advantages over the conventional Krogh vessel for use in zircon UPb geochronology. The TFE Teflon® capsules have friction-fit caps and are intended to reside inside a larger Teflon® pressure vessel.
openaire   +1 more source

In-situ U Pb geochronology of vesuvianite in skarn deposits

Chemical Geology, 2022
Yu Zhang, Shuling Song, Pete Hollings, Dengfeng Li, Yongjun Shao, Huayong Chen, Lianjie Zhao, Sandra Kamo, Tingting Jin, Lingling Yuan, Qingquan Liu, Shaocong Chen   +11 more
openaire   +1 more source

TEMORA 1: a new zircon standard for Phanerozoic U–Pb geochronology

, 2003
L. P. Black, S. Kamo, C. Allen, J. Aleinikoff, D. Davis, R. Korsch, C. Foudoulis   +6 more
semanticscholar   +1 more source

High-Precision U-Pb Zircon Geochronology and the Stratigraphic Record

Reviews in Mineralogy and Geochemistry, 2003
The rock stratigraphic record exists as a rich, albeit complex and incomplete repository of Earth history, tracing the processes of biological evolution, climate change, oceanic and atmospheric chemistry, sea-level fluctuations, mountain-building and erosion, and basin subsidence. Without a detailed and precise temporal framework, however, the richness
openaire   +1 more source

Hf isotopic compositions of the standard zircons and baddeleyites used in U–Pb geochronology

, 2006
Fu-Yuan Wu, Yueheng Yang, Liewen Xie, Jin-Hui Yang, P. Xu   +4 more
semanticscholar   +1 more source

U‐Pb geochronology of zircons from lunar breccia 73217 using a sensitive high mass‐resolution ion microprobe

, 1984
W. Compston, I. Williams, C. Meyer
semanticscholar   +1 more source

Towards a more accurate U–Pb geochronology

Chemical Geology, 2001
Desmond E Moser, David J Scott
openaire   +1 more source