Geoheritage and geodiversity elements of the SW Pacific: A conceptual framework

Abstract

The Soutwest (SW) Pacific is an expansive oceanic region with many of its islands difficult to access and relatively unexplored in a geoheritage context. Here we provide a potential framework for systematically assessing geoheritage values of the SW Pacific and creating a holistic and multi-value inventory. We outline the use of digital terrain models as landform classification tools, and other newly available spatial data. While New Zealand is scientifically and culturally recognised as part of the SW Pacific, due to its large landmass and significant scientific data already available, here we excluded it from our analysis. Rather, the aim of our ongoing research is to provide the first comprehensive overview of the geoheritage potential and unique characteristics of small island nations of the SW Pacific. Only those islands were included in this study where geoheritage research has been initiated and include islands reflecting a good spectrum of geodiversity such as Vanuatu (Ambrym, Ambae, Lopevi, Kuwae group, Tanna), Tonga (Tongatapu, Tofua), and Samoa (Savai’i and Upolu). In a geotectonic context the SW Pacific sits on the western extremity of the large Pacific plate, resulting in a broad array of geotectonic situations where convergent plate boundary processes govern the broad geological evolution and geomorphological processes seen on the islands of our study area. Volcanism associated with plate boundaries is one of the most characteristic and recognisable geological processes linked with the region in the public perception of the area. Volcanism is associated with arc-type geosystems forming complex and compound polygenetic volcanism which offers unique geological-geomorphological elements shaping geodiversity of the region. In addition, these volcanic processes have shaped human communities since the earliest days of their establishment. The interaction of Polynesian societies with volcanism provides a unique geocultural perspective based on accumulated oral traditions, forming the basis of cultural practices that remain part of everyday life into the 21st century.