Regional-Scale Paleoproterozoic Heating Event on Archean Acasta Gneisses in Slave Province, Canada: Insights from K–Ar and 40Ar/39Ar Chronology
Abstract
:1. Introduction
2. Geological Setting
3. Samples and Chemistry of Biotite and Amphibole
4. K–Ar Analyses
5. Laser Step-Heating 40Ar/39Ar Analyses
6. Discussion
6.1. Wopmay Orogen Event on Archean Acasta Gneiss Complex
6.2. Paleoproterozoic Hepburn Batholith
6.3. Heat Source Affecting the Acasta Gneiss
7. Summary
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
Appendix A. Compositional Dependence on Closure Temperature
Appendix B. Excess Argon Wave
References
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Sample | Potassium | Rad. 40Ar | Age | Non-Rad. Ar | Distance | Rock Type | Long. | Lat. |
---|---|---|---|---|---|---|---|---|
(wt.%) | (10−4 cc STP/g) | (Ma) | (%) | (km) | ||||
Biotite | ||||||||
Hwp 1 | 7.332 | 8.946 | 1810 ± 26 | 0.2 | 0.0 | felsic | 115°54′16.02″ W | 65°14′27.19″ N |
9.259 | 1821 ± 26 | 0.3 | 0.0 | ′ | ||||
Weighted average | 1816 ± 18 | |||||||
Hwp 2 | 6.461 | 7.995 | 1837 ± 26 | 0.4 | 0.6 | felsic | 115°53′46.11″ W | 65°14′7.40″ N |
Hwp 3 | 7.755 | 9.559 | 1832 ± 26 | 0.5 | 0.7 | felsic | 115°53′21.81″ W | 65°14′23.83″ N |
Hwp 4 | 7.769 | 9.757 | 1854 ± 26 | 0.4 | 1.7 | Int. | 115°52′6.45″ W | 65°14′15.97″ N |
Hwp 9 | 7.122 | 9.185 | 1884 ± 26 | 0.3 | 4.1 | felsic | 115°50′22.68″ W | 65°13′31.01″ N |
8.856 | 1842 ± 26 | 0.3 | 4.1 | |||||
Weighted average | 1863 ± 18 | |||||||
Hwp 11 | 7.462 | 9.562 | 1877 ± 26 | 0.4 | 5.9 | Int. | 115°47′28.12″ W | 65°13′3.37″ N |
Hwp 12 | 7.217 | 8.642 | 1799 ± 25 | 0.3 | 7.0 | felsic | 115°46′12.91″ W | 65°12′51.39″ N |
Hwp 13 | 7.935 | 9.535 | 1803 ± 26 | 0.4 | 7.0 | felsic | 115°46′12.91″ W | 65°12′51.39″ N |
Hwp 14 | 7.227 | 8.615 | 1794 ± 25 | 0.5 | 8.3 | felsic | 115°44′34.80″ W | 65°12′31.59″ N |
8.773 | 1814 ± 26 | 0.3 | 8.3 | |||||
Weighted average | 1804 ± 18 | |||||||
Hwp 17 | 7.562 | 9.329 | 1833 ± 26 | 0.3 | 14.5 | Int. | 115°37′1.12″ W | 65°11′31.66″ N |
Hwp 18 | 6.987 | 8.518 | 1819 ± 26 | 0.2 | 15.0 | Int. | 115°36′49.07″ W | 65°10′53.86″ N |
Hwp 19 | 7.142 | 8.547 | 1789 ± 26 | 0.2 | 15.0 | felsic | 115°35′39.35″ W | 65°11′46.60″ N |
Hwp 20 | 6.680 | 7.397 | 1711 ± 25 | 0.1 | 15.4 | mafic | 115°37′34.09″ W | 65°10′5.66″ N |
Hwp 21 | 6.521 | 7.889 | 1811 ± 26 | 0.2 | 16.6 | felsic | 115°35′31.20″ W | 65° 9′31.14″ N |
Hwp 22 | 7.103 | 8.711 | 1826 ± 26 | 0.2 | 16.6 | felsic | 115°35′31.20″ W | 65° 9′31.14″ N |
Hwp 23 | 5.532 | 6.745 | 1819 ± 26 | 0.1 | 17.9 | mafic | 115°33′37.14″ W | 65°10′4.40″ N |
Hwp 24A | 6.472 | 7.751 | 1798 ± 25 | 0.2 | 17.9 | mafic | 115°33′37.14″ W | 65°10′4.40″ N |
Hwp 26 | 7.877 | 9.854 | 1789 ± 25 | 0.1 | 17.9 | Int. | 115°33′35.75″ W | 65° 9′54.76″ N |
Hwp 27 | 6.907 | 8.129 | 1779 ± 25 | 0.2 | 17.9 | mafic | 115°33′35.75″ W | 65° 9′54.76″ N |
Amphibole | ||||||||
Hwp 5 | 0.627 | 0.768 | 1824 ± 26 | 0.9 | 2.3 | mafic | 115°51′25.82″ W | 65°14′2.59″ N |
Hwp 6 | 0.274 | 0.296 | 1685 ± 25 | 2.3 | 2.9 | mafic | 115°50′54.73″ W | 65°13′43.43″ N |
Hwp 8 | 1.114 | 1.383 | 1840 ± 26 | 0.5 | 3.4 | Int. | 115°50′22.68″ W | 65°13′31.01″ N |
Hwp 9 | 0.952 | 1.200 | 1858 ± 26 | 0.5 | 4.1 | felsic | 115°50′22.68″ W | 65°13′31.01″ N |
Hwp 10A | 0.948 | 1.201 | 1863 ± 26 | 0.4 | 5.1 | Int. | 115°48′22.87″ W | 65°13′16.16″ N |
Hwp 11 | 1.178 | 1.608 | 1952 ± 27 | 0.5 | 5.9 | Int. | 115°47′28.12″ W | 65°13′3.37″ N |
1.599 | 1945 ± 27 | 0.4 | 5.9 | 115°47′28.12″ W | 65°13′3.37″ N | |||
Weighted average | 1949 ± 19 | |||||||
Hwp 12 | 1.262 | 1.647 | 1899 ± 26 | 0.4 | 7.0 | felsic | 115°46′12.91″ W | 65°12′51.39″ N |
Hwp 14 | 1.269 | 1.705 | 1933 ± 27 | 0.4 | 8.3 | felsic | 115°44′34.80″ W | 65°12′31.59″ N |
1.676 | 1913 ± 26 | 0.3 | 8.3 | 115°44′34.80″ W | 65°12′31.59″ N | |||
Weighted average | 1923 ± 19 | |||||||
Hwp 15 | 0.482 | 0.556 | 1756 ± 25 | 0.5 | 10.9 | Int. | 115°41′9.07″ W | 65°12′17.52″ N |
0.537 | 1718 ± 25 | 0.3 | 10.9 | 115°41′9.07″ W | 65°12′17.52″ N | |||
Weighted average | 1737 ± 18 | |||||||
Hwp 16 | 0.833 | 1.056 | 1864 ± 26 | 0.7 | 12.9 | mafic | 115°38′33.82″ W | 65°11′59.46″ N |
Hwp 18 | 1.947 | 2.309 | 1788 ± 26 | 0.3 | 15.0 | Int. | 115°36′49.07″ W | 65°10′53.86″ N |
Hwp 25B | 0.420 | 0.476 | 1737 ± 27 | 0.4 | 17.9 | felsic | 115°33′37.14″ W | 65°10′4.40″ N |
Sample | Mineral | K-Ar Age | 40Ar/39Ar | 40Ar/39Ar |
---|---|---|---|---|
Ma | Total gas age (Ma) | Plateau age (Ma) | ||
Hwp 1 | biotite | 1816 ± 18 | 1820 ± 21 | 1826 ± 21 |
Hwp 2 | biotite | 1837 ± 26 | 1885 ± 13 | 1886 ± 13 |
Hwp 3 | biotite | 1832 ± 26 | ||
Hwp 4 | biotite | 1854 ± 26 | 1866 ± 18 | 1870 ± 18 |
Hwp 5 | amphibole | 1824 ± 26 | 1789 ± 23 | 1814 ± 22 |
Hwp 6 | amphibole | 1685 ± 25 | ||
Hwp 8 | amphibole | 1840 ± 26 | ||
Hwp 9 | biotite | 1863 ± 18 | ||
amphibole | 1858 ± 26 | 1648 ± 45 | ||
Hwp 10A | amphibole | 1863 ± 26 | 1580 ± 68 | |
Hwp 11 | biotite | 1877 ± 26 | 1709 ± 49 | |
amphibole | 1949 ± 19 | 1598 ± 126 | ||
Hwp 12 | biotite | 1799 ± 25 | 1994 ± 9 | |
amphibole | 1899 ± 26 | (a) 1827 ± 14 | (a) 1847 ± 15 | |
(b) 1839 ± 33 | ||||
Hwp 13 | biotite | 1803 ± 26 | ||
Hwp 14 | biotite | 1804 ± 18 | 1817 ± 8 | 1877 ± 8 |
amphibole | 1923 ± 19 | 1948 ± 24 | ||
Hwp 15 | amphibole | 1737 ± 18 | 1731 ± 73 | |
Hwp 16 | amphibole | 1864 ± 26 | 1683 ± 66 | |
Hwp 17 | biotite | 1833 ± 26 | ||
Hwp 18 | biotite | 1819 ± 26 | 1907 ± 12 | 1935 ± 14 |
amphibole | 1788 ± 26 | 2127 ± 10 | ||
Hwp 19 | biotite | 1789 ± 26 | ||
Hwp 20 | biotite | 1711 ± 25 | ||
Hwp 21 | biotite | 1811 ± 26 | ||
Hwp 22 | biotite | 1826 ± 26 | ||
Hwp 23 | biotite | 1819 ± 26 | ||
Hwp 24A | biotite | 1798 ± 25 | ||
Hwp 25B | biotite | 1939 ± 8 | 1951 ± 11 | |
amphibole | 1737 ± 27 | 1967 ± 11 | 1964 ± 12 | |
Hwp 26 | biotite | 1789 ± 25 | ||
Hwp 27 | biotite | 1779 ± 25 |
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Sato, M.; Hyodo, H.; Sugiura, K.; Tsujimori, T.; Itaya, T. Regional-Scale Paleoproterozoic Heating Event on Archean Acasta Gneisses in Slave Province, Canada: Insights from K–Ar and 40Ar/39Ar Chronology. Minerals 2024, 14, 397. https://doi.org/10.3390/min14040397
Sato M, Hyodo H, Sugiura K, Tsujimori T, Itaya T. Regional-Scale Paleoproterozoic Heating Event on Archean Acasta Gneisses in Slave Province, Canada: Insights from K–Ar and 40Ar/39Ar Chronology. Minerals. 2024; 14(4):397. https://doi.org/10.3390/min14040397
Chicago/Turabian StyleSato, Megumi, Hironobu Hyodo, Kei Sugiura, Tatsuki Tsujimori, and Tetsumaru Itaya. 2024. "Regional-Scale Paleoproterozoic Heating Event on Archean Acasta Gneisses in Slave Province, Canada: Insights from K–Ar and 40Ar/39Ar Chronology" Minerals 14, no. 4: 397. https://doi.org/10.3390/min14040397