TITLE:
Do U/Pb-SHRIMP Dating and Pb Stepwise Leaching (PbSL) Analyses Confirm the Lack of Precambrian Basement Outcrops in Thailand?
AUTHORS:
Bent T. Hansen, Klaus Wemmer, Prinya Putthapiban, Ilka C. Kleinhanns, Franziska Wilsky
KEYWORDS:
SHRIMP Dating, Pb Stepwise Leaching (PbSL), Zircons, Basement, Thailand
JOURNAL NAME:
Open Journal of Geology,
Vol.4 No.10,
October
29,
2014
ABSTRACT: U/Pb-SHRIMP dating and Pb
stepwise leaching (PbSL) experiments on zircons and garnets, respectively have
confirmed the lack of Precambrian outcrops within the crystalline basement of
Thailand. The obtained data for the high grade metamorphism show Indosinian
ages ranging from 225 - 200 Ma as previously suggested for the vast majority of
outcrops in NW-Thailand ([1]and references therein), as well as a
small group of ages in the range of 445 Ma in the Lampang Province. Further,
the age of a thermal imprint around 60 Ma was confirmed near Surat Thani,
Peninsular Thailand, and only a few indications of older ages for the unknown
source areas were detected in detrital components.