Volcanoes of Zealandia and the Southwest Pacific. Issue 4 (1st October 2020)

• Record Type: Journal Article
• Authors: Mortimer, Nick; Scott, James M.
• Is Part Of: New Zealand journal of geology and geophysics. Volume 63:Issue 4(2020)
• Page Start: 371
• Page End: 377
• Publication Date: 2020-10-01
• Subjects: Zealandia -- Southwest Pacific Ocean -- volcanoes -- tectonics -- subduction -- intraplate -- hotspot; Geology -- New Zealand -- Periodicals; Geology -- Periodicals; Geophysics -- Periodicals; Geofysica; Geologie; Geology; Geophysics; New Zealand; Periodicals; 559.3
• DOI: 10.1080/00288306.2020.1713824
• Languages: English
• ISSNs: 1175-8791

Abstract

ABSTRACT: New Zealand and the southwest Pacific region have a well-preserved geological record of Late Cretaceous to Holocene volcanism. Volcanoes and volcanic fields formed in six main tectonic settings: (1) oceanic crust; (2) large igneous provinces; (3) subduction-related volcanic chains; (4) intraplate related to Late Cretaceous rifting of Zealandia from Gondwana; (5) intraplate in Cenozoic age progressive chains that define so-called hotspot tracks; and (6) intraplate with a scattered, Cenozoic, non-age progressive, non-rift-related distribution. At least 500 volcanic fields, stratovolcanoes and seamounts, active within the last 105 million years, can be identified within the c. 5 million km 2 area of Zealandia continental crust. Volcanic rocks from onland New Zealand are the best-studied and dated but represent material from less than a fifth of Zealandia's volcanoes and volcanic fields.