Here's a table of references to scientific papers that dated rocks from Greenland, taken from Brent Dalrymple's The Age of the Earth. Click to grow the image to readable size:
See
Radiometric Ages of Some Early Archean and Related Rocks of the North
Atlantic Craton.
I don't believe plain old U/Pb dating is a commonly used dating method today.
I'm not actually in the field, but I do follow it. Depends on what you mean by "plain old U/Pb dating". There's lots of methods involving U-Th-Pb. U-Pb concordia-discordia dating, first developed around 1954, is
the preferred method. It's very accurate because the decay constants of uranium isotopes are known more accurately than any others, and it is mostly used on zircons in which the initial lead content is essentially zero because of the physics of solidification. And even that tiny bit can be corrected for in various ways. No other method can get sub-1%accuracy.