Data analysis of the U–Pb geochronology and Lu–Hf system in zircon and whole-rock Sr, Sm–Nd and Pb isotopic systems for the granitoids of Thailand

Romana E.C Dew,Simon Nachtergaele,Alan S Collins,Stijn Glorie,John Foden,Johan De Grave,Morgan L Blades,Christopher K Morley,Noreen J Evans,Brandon L Alessio,Pitsanupong Kanjanapayont,Rosalind King,Punya Charusiri

doi:10.1016/j.dib.2018.10.176

Abstract

This data article provides zircon U–Pb and Lu–Hf isotopic information along with whole-rock Sm–Nd, Sr and Pb isotopic geochemistry from granitoids in Thailand. The U–Pb ages are described and the classification of crystallisation and inherited ages are explained. The petrography of the granitoid samples is detailed. The data presented in this article are interpreted and discussed in the research article entitled “Probing into Thailand’s basement: New insights from U–Pb geochronology, Sr, Sm–Nd, Pb and Lu–Hf isotopic systems from granitoids” (Dew et al., 2018).

Highlights

This data article provides zircon U–Pb and Lu–Hf isotopic information along with whole-rock Sm–Nd, Sr and Pb isotopic geochemistry from granitoids in Thailand
We report isotopic data from Thai granitoids of the Southeast Asian Granitoid Belts
20–30 magmatic grains were selected for laser ablation inductively coupled plasma mass spectrometry (LA–ICP–MS) at Adelaide Microscopy, Adelaide, South Australia

Summary

Zircon sample preparation

Eighteen granitoid rock samples were crushed and sieved for collecting zircon grains through the conventional magnetic and heavy liquid separation procedures. 20–30 magmatic grains were selected for laser ablation inductively coupled plasma mass spectrometry (LA–ICP–MS) at Adelaide Microscopy, Adelaide, South Australia. The 2017 batches were run with the 91500 zircon as another secondary standard (207Pb/206Pb age of 1065 Ma and 206Pb/238U age of 1062 Ma; [19]). During these analyses, 135 analyses of 91500 yielded a 206Pb/238U age of 1036.2 7 3.3 (MSWD 1⁄4 4.2, 2σ). Two different 91500 crystals were used for these analyses, where one crystal gives good reproducibility while the other is more heterogeneous This heterogeneity accounts for the large MSWD across the three analytic runs monitoring this standard. All concordia diagrams and weighted averages were calculated using ISOPLOT 4.15 for Excel [20]

Zircon Lu–Hf isotope analysis

U–Pb crystallisation and inherited age determination

Findings

Published isotopic data used for comparison