Geochemical And Geochronological Data For Coorg Metapyroxenites

3.1-billion-year-old Mesoarchean metapyroxenite samples from the Coorg Massif, India, provide constraints on mantle dynamics and crust-mantle interactions. The dataset includes integrated petrography, whole-rock geochemistry, mineral chemistry, and zircon U-Pb geochronology. It was authored by V. Deepchand and published on figshare in April 2026.

Use Cases

• Correlate zircon U-Pb ages of 3159 Ma and 3147 Ma with whole-rock geochemistry to date magmatic crystallization events.
• Analyze major-element trends (e.g., MgO-correlated trends) and trace-element ratios (Nb/Ta, Zr/Th) to infer mantle source characteristics and magmatic fractionation.
• Use HFSE-REE systematics and tectonic discrimination diagrams to evaluate the emplacement setting, such as back-arc or oceanic plateau environments.
• Compare mineral chemistry data (diopside, enstatite, pargasitic-hornblende compositions) with metamorphic assemblages to assess upper amphibolite–lower granulite facies overprinting.
• Integrate geochemical data showing Barberton-type komatiitic basalt affinity with field relations to model a unified plume-influenced geodynamic system for the Western Dharwar Craton.

Strengths

• Includes multiple high-precision U-Pb zircon ages (e.g., 3159 ± 11 Ma) for geochronological constraint.
• Integrates four complementary data types: petrography, whole-rock geochemistry, mineral chemistry, and geochronology.
• Data supports a specific 3.1-billion-year-old Mesoarchean magmatic episode across the Western Dharwar Craton.

Limitations

• The dataset is small at 26.6 MB, limiting the scale of statistical analysis.
• Sample provenance is restricted to the Coorg Massif in India, which may limit broader regional generalizations.
• High-grade metamorphic overprinting may complicate the interpretation of some primary magmatic signatures.

Provenance

Source

V. Deepchand via figshare.

Collection Method

Integrated petrographic, geochemical, and geochronological analysis of rock samples.

Time Range

Mesoarchean, specifically ~3.15 billion years ago.

Freshness

Data was last updated in April 2026.

Geography

Coorg Massif, Western Dharwar Craton, India.