From 6d9d2e4847f1c6e52ad2483ce02765d6e7fe56f7 Mon Sep 17 00:00:00 2001 From: DrDutton Date: Sun, 25 May 2025 17:23:58 -0500 Subject: [PATCH] U-Th section development Created a chapter for U-Th; added a couple references to the bibliography file that I am going to use here; Outlined chapter --- U-Th.qmd | 23 +++++++++++++++++++++++ _quarto.yml | 1 + references.bib | 26 +++++++++++++++++++++++++- 3 files changed, 49 insertions(+), 1 deletion(-) create mode 100644 U-Th.qmd diff --git a/U-Th.qmd b/U-Th.qmd new file mode 100644 index 0000000..d0b3209 --- /dev/null +++ b/U-Th.qmd @@ -0,0 +1,23 @@ +# U-Th + +## Applications {#sec-UTh-Applications} + +Very brief list of different applications of U-Th dating - carbonates, volcanics, etc. + +## History {#sec-UTh-History} + +Alpha-counting 1950s; TIMS 1980s; ICP-MS 1990s incl. Q-MS, ICP-SF-MS, MC-ICP-MS; LA-ICP-MS 2000s? + +Permil level precision w TIMS and ICP-MS; epsilon-level precision with Faraday cup protocols using larger samples and different resistors + +## Challenges {#sec-UTh-Challenges} + +Simultaneous measurement of multiple isotopes with a combination of very high and low abundance; peak-tailing from 238U and also from 232Th for samples with 'high' 232; quantifying fractionation; standards + +## Instrumentation Choice and Analytical Approach {#sec-UTh-AnalyticalChoices} + +Considerations for choice of instrumentation and analytical method +e.g., Advantages and disadvantages for TIMS vs MC ICPMS +FAR-FAR vs. ion counter +types of ion counters + diff --git a/_quarto.yml b/_quarto.yml index 0025bae..baba68b 100644 --- a/_quarto.yml +++ b/_quarto.yml @@ -63,6 +63,7 @@ book: - U_Pb.qmd - U_Th_He.qmd - Re-Os.qmd + - U-Th.qmd - part: "Interpreting Data" chapters: - basic_stats_refresher.qmd diff --git a/references.bib b/references.bib index 9d5e653..27732e2 100644 --- a/references.bib +++ b/references.bib @@ -168,4 +168,28 @@ @article{DeLaeter_2006 pages = {847-854}, doi = { 10.1002/jms.1057} } - +@article{GoldsteinStirling2003, + author = {Goldstein, Steven J. and Stirling, Claudine H.}, + title = {Techniques for Measuring Uranium-series Nuclides: 1992–2002}, + journal = {Reviews in Mineralogy and Geochemistry}, + volume = {52}, + number = {1}, + pages = {23-57}, + year = {2003}, + month = {01}, + issn = {1529-6466}, + doi = {10.2113/0520023}, + url = {https://doi.org/10.2113/0520023}, + eprint = {https://pubs.geoscienceworld.org/msa/rimg/article-pdf/52/1/23/2941493/23.gsrmg.52.pdf}, +} +@article{Shenetal2012, +title = {High-precision and high-resolution carbonate 230Th dating by MC-ICP-MS with SEM protocols}, +journal = {Geochimica et Cosmochimica Acta}, +volume = {99}, +pages = {71-86}, +year = {2012}, +issn = {0016-7037}, +doi = {https://doi.org/10.1016/j.gca.2012.09.018}, +url = {https://www.sciencedirect.com/science/article/pii/S0016703712005248}, +author = {Chuan-Chou Shen and Chung-Che Wu and Hai Cheng and R. {Lawrence Edwards} and Yu-Te Hsieh and Sylvain Gallet and Ching-Chih Chang and Ting-Yong Li and Doan Dinh Lam and Akihiro Kano and Masako Hori and Christoph Spötl} +}