Results 291 to 300 of about 151,775 (355)

Zircon recrystallisation microstructures andthe implications for U-Pb dating

2021
<p>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 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

LA-MC-ICP-MS U-Pb dating of low-U garnets reveals multiple episodes of skarn formation in the volcanic-hosted iron mineralization system, Awulale belt, Central Asia

GSA Bulletin, 2020
Volcanic-hosted iron deposits of the eastern Awulale metallogenetic belt in Central Asia possess a reserve of over 1.2 billion tons of iron ores and constitute one of the most important basements for high-grade iron resources in China.
Shuang Yan, R. Zhou, He‐Cai Niu, Yue‐xing Feng, A. Nguyen, Zhen-hua Zhao, Wubin Yang, Qian Dong, Jian-xin Zhao   +8 more
semanticscholar   +1 more source

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

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
openaire   +1 more source

NanoSIMS imaging method of zircon U-Pb dating

Science China Earth Sciences, 2016
We report an imaging method of zircon U-Pb dating with NanoSIMS 50L, which overcomes the significant U-Pb fractionation as the pit was sputtered deeper during conventional spot mode analysis and can be applied to irregular small grains or heterogeneous areas of zircon.
Sen Hu, YangTing Lin, Wei Yang, Wei-RZ Wang, JianChao Zhang, JiaLong Hao, WeiFan Xing   +6 more
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 zircon dating of Stockholm granite at Frescati

GFF, 1995
Abstract U‐Pb zircon dating of a sample of grey Stockhohn granite from Frescati just north of Stockholm yielded an upper intercept age of 1803+23 ‐19 Ma, similar to earlier age determinations, and interpreted as the age of crystallization of the granite. Ivarsson, C. & Johansson, A., 1995: U‐Pb zircon dating of Stockholm granite at Frescati.
Carin Ivarsson, Åke Johansson
openaire   +1 more source

Water Vapor-Assisted "Universal" Nonmatrix-Matched Analytical Method for the in Situ U-Pb Dating of Zircon, Monazite, Titanite, and Xenotime by Laser Ablation-Inductively Coupled Plasma Mass Spectrometry.

Analytical Chemistry, 2018
The U-Pb geochronologic analysis of accessory minerals has played an important role in Earth and solar system science in constraining the ages of a wide variety of rocks and minerals. Laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS)
Tao Luo, Zhaochu Hu, Wen Zhang, Yongsheng Liu, K. Zong, Lian Zhou, Junfeng Zhang, Shenghong Hu   +7 more
semanticscholar   +1 more source

RMJG Rutile: A New Natural Reference Material for Microbeam U‐Pb Dating and Hf Isotopic Analysis

Geostandards and Geoanalytical Research, 2019
Matrix‐matched reference materials are necessary for accurate microbeam U‐Pb dating and Hf isotopic determination. This study introduces the RMJG rutile as a new potential reference material, which was separated from Palaeoproterozoic pelitic granulites ...
Le Zhang, Jia-Lin Wu, Jiarun Tu, Dan Wu, Nan Li, X. Xia, Zhong‐Yuan Ren   +6 more
semanticscholar   +1 more source