Mesozoic Alkaline Rock U-Pb Zircon Ages from Victoria

U-Pb zircon geochronology data documents up to five pulses of alkaline magmatism in Victoria between approximately 225 and 170 million years ago. The study reports new ages for igneous complexes, including the Gonzaga Monzonite at 226.5±1.3 Ma and a trachyte laccolith at 170.2±0.7 Ma. This data contributes to understanding the evolution of southeastern Australia's intra-plate magmatism.

Use Cases

• Analyze the temporal clustering of magmatic pulses using reported U-Pb zircon ages like 226.5±1.3 Ma and 170.2±0.7 Ma.
• Correlate K-Ar geochronology results with U-Pb zircon ages to assess dating method reliability for events such as c. 190 Ma mafic magmatism.
• Map the spatial distribution of igneous centers like the Barwite and Mount Leinster complexes against reported age clusters.
• Model the evolution of the intra-plate stress field by integrating the timing of igneous activity from the age data clusters.

Strengths

• Data includes new U-Pb zircon ages with reported uncertainties, such as 170.2±0.7 Ma.
• Contextualizes Victoria's events within up to eight regional magmatic pulses between c. 234 Ma and c. 170 Ma.
• Anchors several age clusters with U-Pb zircon or apatite geochronology for higher confidence.

Limitations

• Primary data format is a PDF, limiting direct computational analysis without extraction.
• Uncertainty remains whether age clusters represent discrete pulses or a magmatic continuum due to historical reliance on K-Ar methods.
• Sample data and structured columns are unavailable, hindering tabular analysis.

Provenance

Source

Geoscience Australia Data

Collection Method

U-Pb zircon geochronology analysis conducted as part of the study, supplemented by existing K-Ar data.

Time Range

Late Triassic to Middle Jurassic (c. 225–170 Ma), with regional context from c. 234 Ma to c. 170 Ma.

Freshness

Last updated 2026-03-26.

Geography

Victoria, Australia, with consideration of southeastern Australia from the Sydney Basin to southwest Victoria.