8 Questions 32 Answers 0 Followers
Questions related from Sukanta Dey
Baddeleyite is crucial to date mafic-ultramafic rocks. However, it is difficult to separate by physical processes. In a unique study, Guo et al. (2022)...
17 February 2023 5,560 5 View
I have a set of cogenetic gabbro samples. I wish to separate zircon for U-Pb dating. Zircon is not vey common in gabbro. Then, which sample should I process first? Is there any trick or guideline?...
01 December 2020 1,150 11 View
A-type granitoids are important geodynamic markers. It is therefore crucial to know the age of the oldest A-type granitoids (both A1 and A2 type) of the World.
28 January 2018 7,062 12 View
Sanukitoids are granitoids showing enrichment of both large-ion lithophile elements (K, Ba, Sr) and mafic elements (Mg, Cr and Ni) at the level of their SiO2 contents. It is generally thought that...
30 August 2016 9,319 11 View
I find very faint mention of possible presence of Archaean granitic rocks in Himalaya, especially in the Central Crystallines. Is it proved by zircon U-Pb dating? If yes, who are the currently...
29 June 2016 6,924 14 View
Most of the Archaean granites are sodic (TTG). Other common types are sanukitoid and voluminous K-rich biotite granites. However S-type granites, derived from melting of sediments, are relatively...
13 November 2014 2,263 19 View
Papers often report zircon Hf models ages (single or two stage) and Hf epsilon values in zircons. However the details of worked out examples of calculations are generally not reported. Also not...
26 April 2014 7,267 8 View
For example, if zircons in a rock yield an age of 3100±50 Ma, then how this ±50 is calculated?
25 February 2014 1,567 5 View
