Results 261 to 270 of about 69,328 (308)

Synchronous mid-Holocene marine and terrestrial deglaciation in the Ross Sea, Antarctica. [PDF]

Nat Commun
Parker RL, Riesselman CR, Truax OJ, Jones RS, Lee JI, Lee MK, Jacobsen G, Rosenheim BE, Subt C, Zawadzki A, Ginnane C, Naeher S, Dunbar G, McKay RM, Levy R, Turnbull J, Yoo KC.   +16 more
europepmc   +1 more source

The large mammal fossil fauna of the Cradle of Humankind, South Africa: a review. [PDF]

PeerJ
Malherbe M, Pickering R, Stynder D, Haeusler M.   +3 more
europepmc   +1 more source

Directly dating geologic events: U‐Pb dating of carbonates [PDF]

Reviews of Geophysics, 2009
Carbonates are ubiquitous, forming in a variety of settings including caves, soils, the oceans, during burial from hydrothermal fluids, and along faults. U‐Pb dating of carbonates is applicable to almost the entire geologic time scale, with results from Pleistocene speleothems showing great promise for dating records <1 Ma old.
E Troy Rasbury, Jennifer M Cole
exaly   +2 more sources

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Air abrasion experiments in U-Pb dating of zircon

Chemical Geology, 1986
Abstract Air abrasion of zircon grains can remove metamict material that has lost radiogenic Pb and zircon overgrowths that were added during younger events and thereby improve the precision of the age measurements and permit closer estimates of the original age.
S.S. Goldich, Lynn B. Fischer
openaire   +1 more source

Rb–Sr and U–Pb dating of bentonites

Canadian Journal of Earth Sciences, 1983
A 6 in. (15 cm) bentonite in the Z coal (Cretaceous–Tertiary boundary) in eastern Montana was sampled at four different places, and biotite, sanidine, and zircon were separated from the clay. U–Pb analyses of purified zircons yielded small systematic variations from concordant U–Pb dates.
H. Baadsgaard, J. F. Lerbekmo
openaire   +1 more source

U–Pb SHRIMP dating of uraniferous opals

Chemical Geology, 2006
Abstract U–Pb and U-series analyses of four U-rich opal samples using sensitive high-resolution ion microprobe (SHRIMP) demonstrate the potential of this technique for the dating of opals with ages ranging from several tens of thousand years to millions of years.
Nemchin, Alexander, Neymark, L., Simons, S.   +2 more
openaire   +2 more sources

Ion microprobe U–Pb dating of apatite

Chemical Geology, 1999
Abstract To illustrate in situ Sensitive High Resolution Ion MicroProbe (SHRIMP) analysis of apatites, Pb isotopes and Pb/U ratios of five apatite samples with different ages have been measured using SHRIMP II ion microprobe at Hiroshima University.
Yuji Sano, Takayuki Oyama, Kentaro Terada, Hiroshi Hidaka   +3 more
openaire   +1 more source

Zircon recrystallisation microstructures andthe implications for U-Pb dating

2021
&lt;p&gt;Uranium-lead dating of zircon has been used extensively in geochronological studies based on the widespread occurrence of zircon and its resistance to chemical and physical weathering. Previous research has shown that despite their apparent robustness, many zircons contain evidence for recrystallisation, such as the replacement of the ...
Jasper Huijsmans, Maartje Hamers, Martyn Drury, Jim Lee   +3 more
openaire   +2 more sources

U–Pb dating of andradite-rich garnet by SIMS

Journal of Analytical Atomic Spectrometry, 2022
The SIMS U–Pb dating method for andradite-rich garnet with the andradite composition ranging from 52 to 95 mol% was developed.
Yong-Shu Huang, Wen-Hao Zhao, Yu Liu, Yue-Heng Yang, Guo-Qiang Tang, Yang Li, Xian-Hua Li, Han Zhao, Qiu-Li Li   +8 more
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U-Pb dating of a speleothem of Quaternary age

Geochimica et Cosmochimica Acta, 1998
We demonstrate that U-Pb dating is a promising method for secondary carbonate materials of Quaternary age and older by obtaining a 206Pb∗/238U age for a speleothem with high U (>10 μg g−1) and very low Pb (
Richards, DA, Bottrell, SH, Cliff, RA, Strohle, K, Rowe, PJ   +4 more
openaire   +1 more source