Tectonic affinity of the Nanduan formation in the Changning-Menglian orogenic belt: evidences from the grain-size analysis, detrital composition, and zircon U-Pb geochronology of the metasandstones

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This research aims to clarify the formation age, sedimentary environment, and tectonic properties of the Nanduan formation.
Conducted grain-size analysis, detrital composition analysis, and zircon U-Pb geochronology of metasandstones.
Analyzed peak zircon ages focusing on significant geological periods.
Interpreted sediment sources based on compositional data and size distribution.
Zircon age peaks indicate development during the Pan-African (575-525 Ma), late Grenvillian (960-820 Ma), and early Grenvillian (1188-1065 Ma) periods.
Sediment sources suggest contributions from the Albany-Fraser orogenic belt and other geological regions.
Results imply a shallow marine sedimentation environment influenced by tectonic events.

Investigates sediment composition and age in metasandstones, suggesting tectonic influences.

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CHEN et al. (2026) studied this question.

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