Abstract Details
(2020) Comparative Chronology of Garnet, Zircon and Monazite in (Ultra)high-Temperature and -Pressure Rocks
Tual L, Smit M, Kooijman E & Schmitt M
https://doi.org/10.46427/gold2020.2630
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04h: Room 1, Friday 26th June 07:00 - 07:03
Lorraine Tual
View abstracts at 6 conferences in series
Matthijs Smit View all 2 abstracts at Goldschmidt2020
Ellen Kooijman View all 2 abstracts at Goldschmidt2020
Melanie Schmitt View abstracts at 4 conferences in series
Matthijs Smit View all 2 abstracts at Goldschmidt2020
Ellen Kooijman View all 2 abstracts at Goldschmidt2020
Melanie Schmitt View abstracts at 4 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 Shah Wali Faryad on Tuesday 23rd June 15:34
Comparative Chronology of Garnet, Zircon and Monazite in (Ultra)high-Temperature and -Pressure Rocks Tual L, Smit M, Kooijman E & Schmitt M Nice results from this comparison and the observation that garnet grow results in depletion of HREE in cogenetic Zr and Mnz. My question is, can zircon or monazite grow during prograde stage, when most of the HREE and MREE are consumed by garnet?
Hi Wali, thanks for your question! ?Yes, depending on their forming reactions(/precursor) and crystallization process they could both grow during the prograde part of the path, although it is difficult to unravel exactly how. We think that some zrn and mnz domains are indeed prograde that is why they both capture garnet growth pulses so well in the Fjørtoft sample. Texture-wise, we find both phases in garnet core, and more abundantly in garnet rim (and matrix), which also supports this. Garnet does control the HREE budget but this does not prevent the accessory minerals to grow.
Comparative Chronology of Garnet, Zircon and Monazite in (Ultra)high-Temperature and -Pressure Rocks Tual L, Smit M, Kooijman E & Schmitt M Nice results from this comparison and the observation that garnet grow results in depletion of HREE in cogenetic Zr and Mnz. My question is, can zircon or monazite grow during prograde stage, when most of the HREE and MREE are consumed by garnet?
Hi Wali, thanks for your question! ?Yes, depending on their forming reactions(/precursor) and crystallization process they could both grow during the prograde part of the path, although it is difficult to unravel exactly how. We think that some zrn and mnz domains are indeed prograde that is why they both capture garnet growth pulses so well in the Fjørtoft sample. Texture-wise, we find both phases in garnet core, and more abundantly in garnet rim (and matrix), which also supports this. Garnet does control the HREE budget but this does not prevent the accessory minerals to grow.
Submitted by Lorraine Tual on Wednesday 24th June 06:50
Hi Wali, thanks for your question! ?Yes, depending on their forming reactions(/precursor) and crystallization process they could both grow during the prograde part of the path, although it is difficult to unravel exactly how. We think that some zrn and mnz domains are indeed prograde that is why they both capture garnet growth pulses so well in the Fjørtoft sample. Texture-wise, we find both phases in garnet core, and more abundantly in garnet rim (and matrix), which also supports this. Garnet does control the HREE budget but this does not prevent the accessory minerals to grow.
Hi Wali, thanks for your question! ?Yes, depending on their forming reactions(/precursor) and crystallization process they could both grow during the prograde part of the path, although it is difficult to unravel exactly how. We think that some zrn and mnz domains are indeed prograde that is why they both capture garnet growth pulses so well in the Fjørtoft sample. Texture-wise, we find both phases in garnet core, and more abundantly in garnet rim (and matrix), which also supports this. Garnet does control the HREE budget but this does not prevent the accessory minerals to grow.
Submitted by Ziyi Zhu on Friday 26th June 04:52
Hi Lorraine, thanks for your poster, very interesting topic! You mentioned in your highlights that "lowest Gd/Yb values in accessory minerals may be diagnostic of garnet growth if REE uptake by garnet was strongly supply limited", but if garnet grows and sequesters most of the HREE at the very beginning, accessory minerals formed later would be expected to have relatively higher Gd/Yb ratios. Could you please explain a bit more on that point you made in the highlights? Thanks!
Hi Lorraine, thanks for your poster, very interesting topic! You mentioned in your highlights that "lowest Gd/Yb values in accessory minerals may be diagnostic of garnet growth if REE uptake by garnet was strongly supply limited", but if garnet grows and sequesters most of the HREE at the very beginning, accessory minerals formed later would be expected to have relatively higher Gd/Yb ratios. Could you please explain a bit more on that point you made in the highlights? Thanks!
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