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Vanua Levu

Second largest island of Fiji

  • 6 min read
  • 7 chapters
Vanua Levu
Unknown author · Public domain

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Through Island, Plate tectonics and Stratum

Geology

Fiji lies in a tectonically complex area between the Australian plate and the Pacific plate. The Fiji Platform lies in a zone bordered with active extension fault lines around which most of the shallow earthquakes were centred. These fault lines are the Fiji Fracture Zone (FFZ) to the north, the 176° Extension Zone (176°E EZ) to the west, and the Hunter fracture zone (HFZ) and Lau Ridge to the east.

Mio-Pliocene sandstones and marl grade into epiclastics and andesitic volcanics of the Suva Group. The Group forms the Korotini Tableland in the middle of the island, it includes the peaks of Seseleka (1,380 feet or 420 meters), Ndelanathau (2,443 feet or 745 meters), Nararo (2,420 feet or 740 meters), Valili (2,965 feet or 904 meters), Mariko (2,890 feet or 880 meters), Mount Nasorolevu (3,386 feet or 1,032 meters), Ndikeva (3,139 feet or 957 meters), and Uluingala (2,730 feet or 830 meters). The Pliocene Undu Group in the northeastern portion of the island, consists of breccia, tuff, and flows of rhyolite and dacite overlain by pumiceous strata. The Plio-Pleistocene Mba Group is found on the southwestern portion of the island and consists of porphyritic basalt flows and volcanoclastics grading into greywacke. The Group includes the peak of Navotuvotu (2,763 feet or 842 meters) and the Mt. Kasi Mine.

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