Chemical‐petrographic and isotopic characterization of the volcanic pavement along the ancient Appia route at the Aurunci Mountain Pass, Italy: Insights on possible provenance

The ancient Appia route was built across central‐southern Italy between the fourth and
second century before the common era (B.C.E.). At the Aurunci Mountain Pass, the route
crosses carbonate ridges that provided the raw material used to pave the road in the first
century C.E. This material was replaced with lava blocks of unknown origin in the third
century C.E. The study area is at least 50 km from the main volcanic centers along the peri‐
Tyrrhenian side of Italy, such as the Colli Albani, Roccamonfina, and Middle Latin Valley
volcanoes. The main objective of this research was the chemical–petrographic and isotopic
characterization of rock samples from the Appia flagstones to unravel their possible
provenance. The analytical procedure included scanning electron microscope and electron
microprobe analyses and 87Sr/86Sr–143Nd/144Nd isotopic measurements. Samples taken
from unknown quarries found in the Middle Latin Valley volcanic field underwent the same
analyses. After comparing the analysis results with data from the literature, the most likely
source area was identified with the Roccamonfina precaldera ultrapotassic sequence. The
availability and use of volcanic resources for the construction and maintenance of the
ancient Appia route in the investigated territories are only outlined in this work and
deserve further study.

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