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| Line Islands hotspot | |
|---|---|
| Name | Line Islands hotspot |
| Location | Central Pacific Ocean |
| Type | Volcanic hotspot (mantle plume hypothesis) |
| Age | Cenozoic |
| Last eruption | Submarine/unknown |
Line Islands hotspot
The Line Islands hotspot is a proposed deep-mantle upwelling system inferred from the Line Islands chain of atolls, coral islands, and seamounts in the central Pacific Ocean. The feature has been examined by researchers studying Pacific Plate motion, Hawaii-Emperor seamount chain, and global mantle plume hypotheses through multidisciplinary programs including Deep Sea Drilling Project, Ocean Drilling Program, and Integrated Ocean Drilling Program. Debates over origin, age progression, and mantle source have linked studies to the broader contexts of plate tectonics, hotspot track, and ocean island basalt petrogenesis.
The volcanic chain lies near geopolitical entities including Kiribati, United States Minor Outlying Islands, and the Line Islands (disambiguation), extending across bathymetric structures studied by NOAA, Woods Hole Oceanographic Institution, Scripps Institution of Oceanography, and the National Geographic Society. Regional tectonics involve interactions among the Pacific Plate, paleo-plate reconstructions tied to the Cretaceous Superchron, and proximity to features like the Samoa hotspot and the Phoenix Plate remnants. Bathymetric mapping by GEBCO, sonar surveys by RV JOIDES Resolution, and magnetic anomaly work connected to Vening Meinesz and Marie Tharp efforts have defined seafloor morphology and fracture zone relationships.
Proposed origins invoke classical mantle plume models formulated by W. Jason Morgan and alternatives such as shallow-lithosphere focus proposed by Don L. Anderson, Jason Phipps Morgan? debates, and plate-driven models championed by researchers like Peter J. W. Patton and G. Foulger. Investigations compare the chain to canonical tracks such as the Hawaii hotspot and juxtapose plume-model predictions with plate-motion reconstructions by Jason Morgan (geophysicist), Paul Tapponnier, and Derek Keir. Geodynamic modeling by groups at Lamont–Doherty Earth Observatory, University of Oxford, and University of California, Santa Cruz employ seismic tomography from networks including USArray and stations used in studies by Nolet, van der Hilst, and Romanowicz to image potential mantle anomalies.
The chain comprises emergent atolls like Kiritimati and Tabuaeran, submerged guyots and seamounts such as Kingman Reef and Vostok Guyot, and reef platforms mapped in expeditions by Alfred Wegener Institute, Australian National University, and Smithsonian Institution researchers. Morphologic comparisons draw on studies of atoll formation by Charles Darwin, reef ecology work by Thomas Goreau, and carbonate platform analyses paralleling investigations at Seychelles and Maldives. Structural data include stratigraphic cores correlated with records from Maud Rise and Jason Ridge studies, while geomorphology has been interpreted with reference to subsidence frameworks advanced by John T. Wilson and Henry Menard.
Radiometric constraints derive from K–Ar dating, 40Ar/39Ar dating, and biostratigraphic markers tied to microfossil zonations developed by Eldredge, A. R. Loeblich Jr., and H. T. U.. Age-progressive trends have been compared to reconstructions by W. Jason Morgan and plate motion models by K. Duncan and F. J. Vine. Paleomagnetic investigations referencing work by Keith Runcorn and A. M. T. Moore have been used to test fixed-hotspot assumptions, while comparisons with seafloor spreading anomalies cataloged by Frederik Vine and Drummond Matthews contextualize relative motion. Chronostratigraphic frameworks incorporate data from Deep Sea Drilling Project leg 30 and Ocean Drilling Program leg 197 style campaigns.
Isotopic and trace-element signatures—such as Sr–Nd–Pb isotope systems—have been analyzed by laboratories at University of Cambridge (UK), ETH Zurich, Lamont–Doherty Earth Observatory, and GEOMAR Helmholtz Centre for Ocean Research Kiel. Comparisons invoke canonical reservoirs like DMM (depleted mantle), EMI, EMII, and HIMU end-member classifications advanced by Hannu Huhma and Bernard Wood. Melt generation models reference experiments by Walter M. White and James B. Gill and draw parallels to basalts from Galápagos, Mariana Islands, and Azores. Seismic tomography results from groups led by Maia A. B. van der Voo and Brian Kennett inform interpretations of plume conduit geometry.
Atoll ecosystems support diverse taxa including reef-building corals studied by Charles Darwin, Thomas Goreau, and Nancy Knowlton; seabird colonies documented by David Lack and A. J. Baker; and pelagic fisheries monitored by Food and Agriculture Organization programs. Coral reef resilience and bleaching events have been linked to regional climate phenomena such as El Niño–Southern Oscillation and Pacific Decadal Oscillation, with conservation efforts by Conservation International, The Nature Conservancy, and national agencies in Kiribati. Biodiversity surveys reference work by Alexander Agassiz, Charles Wyville Thomson, and modern taxonomists at Natural History Museum, London and Smithsonian National Museum of Natural History.
Human interactions include Polynesian voyaging traditions discussed alongside Thor Heyerdahl and archaeological studies comparable to Lapita culture research. European contact records feature explorers like Captain James Cook and Charles Wilkes, while modern geopolitical stewardship involves Republic of Kiribati, United States designations, and international law instruments such as the United Nations Convention on the Law of the Sea. Scientific campaigns have been led by institutions including Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, Monterey Bay Aquarium Research Institute, and collaborative programs like International Seabed Authority consultation efforts. Ongoing research integrates remote sensing from Landsat, Sentinel satellites, and ship-based sampling from vessels like RV Kilo Moana and RV Investigator.
Category:Volcanism of the Pacific Ocean Category:Seamount chains Category:Hotspots