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Tracking Columbia's Slow Dance: Ancient magnetic clues reveal supercontinent stabilisation

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  • High-precision magnetic signatures from 1.70–1.68 billion-year-old mafic dykes in the North China Craton offer rare insights into Earth’s ancient continental positions.
  • Subtle shifts between the North China and North Australian cratons between 1.73 and 1.65 billion years ago mark a key transitional phase in Columbia's formation.
  • Findings suggest Columbia's tectonic configuration became more stable during the Statherian period, refining our models of early supercontinent assembly.

Wang, C., Peng, P., Mitchell, R.N., Deng, C., Salminen, J., Liu, Y. & Kirscher, U. (2025). Toward a more stable supercontinent Columbia in the Statherian. Geophysical Research Letters, 52, e2025GL116097. https://doi.org/10.1029/2025GL116097.

Magnetism and Palaeomagnetism

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Earth’s Mineral Pulse: Reading supercontinent cycles through critical metal systems

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  • Mineral deposit ages reveal a repeating tectonic rhythm of about 750 million years, linked to supercontinent assembly and breakup.
  • Pegmatite-hosted critical metals increasingly formed on faster cycles as Earth’s mantle cooled and plate tectonics matured.
  • Crustal source complexity appears about 300 million years before pegmatite mineralisation, offering an early signal of future metal fertility.

Kirkland, C. L. (2026). Pacing supercontinent rhythms from the metallogenic record. Geology, 54 (6), 507–511. https://doi.org/10.1130/G54471.1.

Geochronology
Resource Geoscience
Geoinformatics and Geocomputing

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Machine Learning & AI for Geological Materials
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Zircon Knows: Smarter Ore Exploration Through Machine Learning

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  • Using the trace chemistry of zircon, researchers accurately predicted the source rock type—even without visible geological context.
  • Random Forest models achieved over 90% accuracy in classifying both igneous rocks and ore deposits from zircon element data.
  • Just eight elements in zircon—including hafnium, uranium, and yttrium—are enough to map mineral systems and guide exploration.

Wen, Z.-H., Li, L., Kirkland, C.L., Li, S.-R., Sun, X.-J., Lei, J.-L., Xu, B. & Hou, Z.-Q. (2024). A machine learning approach to discrimination of igneous rocks and ore deposits by zircon trace elements. American Mineralogist, 109(6), 1129–1142. https://doi.org/10.2138/am-2022-8899.

Geochemistry
Geoinformatics and Geocomputing
Resource Geoscience

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Machine Learning & AI for Geological Materials
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How heavy minerals reveal climate and weathering histories

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  • A continental-scale heavy mineral data set captures both geological origin and environmental overprint, allowing distinction between source rock signals and climate-driven mineral alteration across Australia.
  • Weathering and sediment storage significantly reshape heavy mineral signatures, with labile minerals like apatite rapidly lost in warm, wet, or low-relief environments.
  • Mineral indices provide a tool to map palaeo-weathering intensity, offering a way to evaluate sediment reworking and upgrading of Ti–Zr–REE placer deposits in ancient landscapes.

Dröllner, M., Barham, M., Kirkland, C.L., Zametzer, A. & Schulz, M. (2025). Australian continental‐scale heavy mineral patterns track climate, weathering and erosion. Sedimentology, 72(5), 1430–1452. https://doi.org/10.1111/sed.70008.

Regolith and Sedimentology
Resource Geoscience

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Particle Analysis
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Precise positioning from commercial broadband satellites

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  • Differential Doppler models using broadband signals from multiple low Earth orbit constellations, such as Starlink and OneWeb, achieved positioning accuracies under 0.5 m in ideal test conditions.
  • Even with 15-second signal bursts and 30° elevation limits, models maintained sub-meter accuracy, proving feasibility despite commercial satellite constraints.
  • Signal degradation was primarily due to free space attenuation, while atmospheric losses from clouds and fog were negligible.

Allahvirdi-Zadeh, A., El-Mowafy, A. & Wang, K. (2025). Doppler positioning using multi-constellation LEO satellite broadband signals as signals of opportunity. NAVIGATION, 72(2). https://doi.org/10.33012/navi.691.

Geoinformatics and Geocomputing
Geomatic Engineering

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Epithermal mineral systems along the inferred final Nuna suture

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  • A lithospheric-scale, west-dipping fault system—termed the Empress Suture Zone—likely marks the final Nuna suture and acted as a long-lived pathway focusing fluids into the shallow crust.
  • Post-orogenic gold-silver-lead-zinc mineralization occurred at ca. 1550 Ma and was probably reactivated in the Permo–Carboniferous (ca. 330–250 Ma).
  • Geochemistry and mineralogy reveal characteristics of a low-sulfidation epithermal system, including quartz–sericite alteration and gold-to-silver ratios around 1.

Olierook, H.K.H., Affleck, R.G., Evans, N.J., Jourdan, F., Kirkland, C.L., Volante, S., Nordsvan, A.R., McInnes, B.I.A., McDonald, B., Mayers, C., Frew, R.A., Rankenburg, K., d’Offay, N., Nind, M. & Larking, A. (2021). Mineralization proximal to the final Nuna suture in northeastern Australia. Gondwana Research, 92, 54–71. https://doi.org/10.1016/j.gr.2020.12.017.

Geochemistry
Geochronology
Resource Geoscience

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