Talk:Oldest dated rocks

message: I have a source that says the Australian Zircon fragments have radiometric ages of around 4150Ma rather than 4404Ma. Can anyone find some sources suggesting otherwise? Jason McConnell-Leech 01:47, 3 September 2007 (UTC)
thread_title: Australian Zircon

message: Technically, the oldest individual rock found on Earth (so far) is the ALH84001 meteorite, found in Allan Hills, Antarctica in 1984. Its formation has been dated to 4.5 Gyr ago. It is not part of the Earth's geological history (it only landed on Earth about 13,000 years ago), but I have mentioned it in a footnote. Gandalf61 08:26, 27 September 2007 (UTC)
replies: text: Okay, I have generalised the meteorites footnote so that it just uses ALH84001 as an example of older rocks. Gandalf61 08:29, 28 September 2007 (UTC)
thread_title:  ALH84001 

message: I mean, seriously, Earth is like one big rock, right? So isn't the inner core the oldest rock? Hananoshi 13:14, 24 August 2008 (UTC)
replies: text: OpposeDo people really consider the inner core when they talk about rock? I tend to think they consider the stuff on the surface. Enlil Ninlil (talk) 09:48, 25 August 2008 (UTC)

text: Support Oldest dated rock, or something similar. Viriditas (talk) 14:02, 26 December 2009 (UTC)
thread_title: Oldest ROCK!???

message: Shouldn't the rocks on earth section (or some other part of the article) make mention of the Apollo moon rocks? They're much older than the oldest terrestrial rocks, and they're on earth now. Maybe a section on non-terrestrial rocks? 84.245.33.163 (talk) 01:38, 17 January 2009 (UTC)
thread_title: Moon rocks?

message: Can any body find the correct wiki article that describes the method for dating the crystals? Has it to do with the decay of uranium? A link, note or paragraph would be good. Ctbolt (talk) 12:29, 25 March 2012 (UTC)
replies: text: See Zircon#Radiometric_dating and links therein. And, yes uranium it is. Vsmith (talk) 13:40, 25 March 2012 (UTC)
thread_title:  Dating method 

message: I've removed the following as it contains innaccuracies and over generalizations from the referenced article.
:A 2012 report in a reliable publication stated a previous flaw in the dating of geological material, with the result of all prior dates being incorrect by 20 to 80 million years and by another method 70 million, such that the rocks of study are, in fact, younger than thought previously. 03 April 2012  L Grossman New Scientist  Retrieved 2012-05-06
The referenced New Scientist article discusses two specific dating techniques. The samarium-146 method was found to heave a discrepancy due to a new half life determination - using the revised HL the dated material "formed 20 million to 80 million years earlier than thought". The second involved uranium isotope ratios for which the suggested discrepancy amounted to rocks previously dated at "4.4 billion years old are now younger by 700,000 years". That would mean the 4,400,000.000 year age would be 4,399,300,000 years which rounds to the stated precision of 4.4 bya. Vsmith (talk) 14:04, 22 July 2012 (UTC)
thread_title:  Removed from lead 

message: Best I can tell looking at the initial paper the measurements for the oldest part of this rock were 4.40±0.11 billion years with the 4.46 figure being their estimated age of the crust:
https://journals.uair.arizona.edu/index.php/maps/article/download/14799/14770
©Geni (talk) 02:22, 15 December 2017 (UTC)
thread_title: Lunar sample 67215

message: https://www.nature.com/articles/s41467-018-05501-0
©Geni (talk) 01:48, 1 November 2018 (UTC)
thread_title: Paper on oldest silica-rich Meteorite

message: The following sentences in the lead are repeated word-for-word in the "Oldest terrestrial material" section:
:In January 2019, NASA scientists reported the discovery of the oldest known Earth rock – on the Moon. Apollo 14 astronauts returned several rocks from the Moon and later, scientists determined that a fragment from the rock nicknamed Big Bertha contained "a bit of Earth from about 4 billion years ago." The rock fragment contained quartz, feldspar, and zircon, all common on the Earth, but highly uncommon on the Moon.[4]
Can they be removed from the lead?
The following sentence in the lead describes a particular non-terrestrial rock:
:In January 2020, astronomers reported that the oldest material on Earth found so far are Murchison meteorite particles that have been determined to be 7 billion years old, billions of years older than the 4.54 billion years age of the Earth itself.[5][6]
Shouldn't it be in the "Non-terrestrial rocks" section?165.225.38.206 (talk) 19:11, 15 January 2020 (UTC)
thread_title:  Are these items in the right place?