Abstract Details
(2020) Mapping the 4D Lithospheric Architecture of Zealandia Using Zircon O and Hf Isotopes in Plutonic Rocks
Turnbull R, Schwartz J, Fiorentini M, Jongens R, Ludwig T, Evans N, McDonald B & Klepeis K
https://doi.org/10.46427/gold2020.2637
The author has not provided any additional details.
04j: Room 1, Saturday 27th June 00:45 - 00:48
Rose Turnbull
View abstracts at 3 conferences in series
Joshua Schwartz View all 3 abstracts at Goldschmidt2020 View abstracts at 3 conferences in series
Marco Fiorentini View all 3 abstracts at Goldschmidt2020 View abstracts at 5 conferences in series
Richard Jongens
Thomas Ludwig View abstracts at 11 conferences in series
Noreen Evans
Brad McDonald
Keith Klepeis View all 2 abstracts at Goldschmidt2020 View abstracts at 3 conferences in series
Joshua Schwartz View all 3 abstracts at Goldschmidt2020 View abstracts at 3 conferences in series
Marco Fiorentini View all 3 abstracts at Goldschmidt2020 View abstracts at 5 conferences in series
Richard Jongens
Thomas Ludwig View abstracts at 11 conferences in series
Noreen Evans
Brad McDonald
Keith Klepeis View all 2 abstracts at Goldschmidt2020 View abstracts at 3 conferences in series
Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.
Submitted by Changqian Ma on Saturday 20th June 09:07
Thank you for showing a very exciting and interesting study! Could you please tell us whether the area of the Zealandia is larger than New Zealand? How were the submerged intrusive rocks sampled?
Zealandia the continent is >94% submerged, so the onshore component of New Zealand is very small compared to what is concealed beneath the ocean. Our study focused on the onshore component, but equivalent granitoid rocks are found on remote offshore islands and dredge samples from the wider Zealandia continent, suggesting the area of crust with anomalous light d18O values might be even greater in size. The rocks we sampled are granitoids exposed at the surface - the melts that produced them were sourced from the concealed Rodinian lithosphere.
Thank you for showing a very exciting and interesting study! Could you please tell us whether the area of the Zealandia is larger than New Zealand? How were the submerged intrusive rocks sampled?
Zealandia the continent is >94% submerged, so the onshore component of New Zealand is very small compared to what is concealed beneath the ocean. Our study focused on the onshore component, but equivalent granitoid rocks are found on remote offshore islands and dredge samples from the wider Zealandia continent, suggesting the area of crust with anomalous light d18O values might be even greater in size. The rocks we sampled are granitoids exposed at the surface - the melts that produced them were sourced from the concealed Rodinian lithosphere.
Submitted by Calvin Miller on Friday 26th June 21:39
Hi Rose, fascinating very big isotopic study! And striking results! The low-d18O domain certainly is unique (to my knowledge), perhaps especially so for plutonic rocks (fairly extensive low-d18O is more widely documented in volcanics – but somewhat less extensive in space and much less in time). What is e(Hf) like in the western, higher-d18O domain? I don’t think you mentioned that.
Hi Rose, fascinating very big isotopic study! And striking results! The low-d18O domain certainly is unique (to my knowledge), perhaps especially so for plutonic rocks (fairly extensive low-d18O is more widely documented in volcanics – but somewhat less extensive in space and much less in time). What is e(Hf) like in the western, higher-d18O domain? I don’t think you mentioned that.
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