Description
The supplementary data are subject to the same embargo period as the post-print. The supplementary files are available online (see publication DOI link), and will also be available here from 16/07/20.
The supplementary content includes:
Supplementary_Material_Additional_description_Additional_images.pdf - description of the other supplementary files
Supplementary_file_Lithos_Final.xlsx - Analyses & Standards U-Pb/Lu-Hf/TEA, Ti & Zr geothermometry
Grains_supplementary.pdf -
A) Optical microphotographs of rutile grain with two distinct ages suggesting resetting of the U-Pb system. Zirconium concentration is very similar because it diffuses slower than Pb and likely represent Archaean crystallisation temperature;
B) Heavy minerals from sample B1a. Presence of rutile, zircon and tourmaline;
C) Optical microscope stage rotated at 90° compared to previous picture. Note the characteristic reverse pleochroism in tourmaline grain;
D) Possible porosity in rutile after recrystallisation;
E) Relict ilmenite within rutile;
F) Transparent and predominantly pale-pink colour soccer ball zircon grains;
H) Cathodoluminescence of soccer ball zircons shown in figure F.
Supplementary figures (individual files) -
Figure 1: SEM-EDS elemental mapping of thin-section from schist B1a and Backscatterelectron (BSE) image of the same mapped area. Main mineral phases are indicated.
Figure 2: BSE image of a zircon grain from sample B1a and main mineral phases associated.
Figure 3: EDS mapping of relict unstable ilmenite reacting to porous rutile. Other mineral
phases also shown. BSE of the same area also presented.
Figure 4: Thin-section of sample B2a. The felsic intrusion is mostly composed by albite, quartz and chlorite. Biotite, rutile, epidote and primary white-mica are also present. BSE image of the same area also shown. Note the porosity within the rutile grains, similar to those from sample B1a.
Figure 5: Thin-section of coarser part of intrusion B2a mostly composed by plagioclase and
quartz. Note the presence of epidote and secondary mica within the albite. Chlorite is the main phyllosilicate in the section. BSE image also presented.
Figure 6: Concordia diagram of U-Pb rutile analyses after common lead correction based on
208Pb. The oldest rutile grains are not 100% concordant, but are Archaean in age. Most of
grains were reset during the Palaeoproterozoic.
The supplementary content includes:
Supplementary_Material_Additional_description_Additional_images.pdf - description of the other supplementary files
Supplementary_file_Lithos_Final.xlsx - Analyses & Standards U-Pb/Lu-Hf/TEA, Ti & Zr geothermometry
Grains_supplementary.pdf -
A) Optical microphotographs of rutile grain with two distinct ages suggesting resetting of the U-Pb system. Zirconium concentration is very similar because it diffuses slower than Pb and likely represent Archaean crystallisation temperature;
B) Heavy minerals from sample B1a. Presence of rutile, zircon and tourmaline;
C) Optical microscope stage rotated at 90° compared to previous picture. Note the characteristic reverse pleochroism in tourmaline grain;
D) Possible porosity in rutile after recrystallisation;
E) Relict ilmenite within rutile;
F) Transparent and predominantly pale-pink colour soccer ball zircon grains;
H) Cathodoluminescence of soccer ball zircons shown in figure F.
Supplementary figures (individual files) -
Figure 1: SEM-EDS elemental mapping of thin-section from schist B1a and Backscatterelectron (BSE) image of the same mapped area. Main mineral phases are indicated.
Figure 2: BSE image of a zircon grain from sample B1a and main mineral phases associated.
Figure 3: EDS mapping of relict unstable ilmenite reacting to porous rutile. Other mineral
phases also shown. BSE of the same area also presented.
Figure 4: Thin-section of sample B2a. The felsic intrusion is mostly composed by albite, quartz and chlorite. Biotite, rutile, epidote and primary white-mica are also present. BSE image of the same area also shown. Note the porosity within the rutile grains, similar to those from sample B1a.
Figure 5: Thin-section of coarser part of intrusion B2a mostly composed by plagioclase and
quartz. Note the presence of epidote and secondary mica within the albite. Chlorite is the main phyllosilicate in the section. BSE image also presented.
Figure 6: Concordia diagram of U-Pb rutile analyses after common lead correction based on
208Pb. The oldest rutile grains are not 100% concordant, but are Archaean in age. Most of
grains were reset during the Palaeoproterozoic.
| Date made available | 16 Jul 2019 |
|---|---|
| Publisher | Elsevier BV |