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Multiple melt source origin of the Line Islands (Pacific Ocean)

July 23, 2021

The Line Islands volcanic chain in the central Pacific Ocean exhibits many characteristics of a hotspot-generated seamount chain; however, the lack of a predictable age progression has stymied previous models for the origin of this feature. We combined plate-tectonic reconstructions with seamount age dates and available geochemistry to develop a new model that involves multiple melt regions and multiple melt delivery styles to explain the spatial and temporal history of the Line Islands system. Our model identifies a new melt source region (Larson melt region at ~17°S, ~125°W) that contributed to the formation of the Line Islands, as well as the Mid-Pacific Mountains and possibly the Pukapuka Ridge.

Publication Year 2021
Title Multiple melt source origin of the Line Islands (Pacific Ocean)
DOI 10.1130/G49306.1
Authors Robert Pockalny, Ginger Barth, Barry Eakins, Katherine A. Kelley, Christina Wertman
Publication Type Article
Publication Subtype Journal Article
Series Title Geology
Index ID 70223510
Record Source USGS Publications Warehouse
USGS Organization Pacific Coastal and Marine Science Center