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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Southern Africa
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South Africa (1)
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Antarctica
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Antarctic Peninsula (1)
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South Shetland Islands (1)
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Arctic region
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Greenland (1)
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Asia
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Far East
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China (1)
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Siberia (1)
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Canada (1)
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Circum-Antarctic region (1)
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Drake Passage (1)
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Oceania
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Melanesia
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Malaita (2)
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Pacific Ocean
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East Pacific
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Southeast Pacific
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Manihiki Plateau (1)
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South Pacific
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Southeast Pacific
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Manihiki Plateau (1)
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West Pacific
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Ontong Java Plateau (2)
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Scotia Sea Islands
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South Shetland Islands (1)
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Solomon Islands (2)
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South America
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Brazil (1)
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elements, isotopes
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halogens
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bromine (1)
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iodine (1)
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isotope ratios (3)
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isotopes
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radioactive isotopes
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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stable isotopes
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Hf-177/Hf-176 (1)
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Nd-144/Nd-143 (2)
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Os-188/Os-187 (1)
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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Sr-87/Sr-86 (2)
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metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (2)
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hafnium
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Hf-177/Hf-176 (1)
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lead
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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platinum group
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osmium
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Os-188/Os-187 (1)
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rare earths
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neodymium
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Nd-144/Nd-143 (2)
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geochronology methods
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Re/Os (1)
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Sm/Nd (1)
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geologic age
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Mesozoic
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Jurassic (1)
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Paleozoic
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lower Paleozoic (1)
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Precambrian
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upper Precambrian
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Proterozoic
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Mesoproterozoic (1)
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igneous rocks
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igneous rocks
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kimberlite (1)
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plutonic rocks
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alnoite (2)
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gabbros (1)
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ultramafics
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peridotites
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dunite (1)
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spinel lherzolite (1)
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volcanic rocks
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basalts (2)
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metamorphic rocks
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metamorphic rocks
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eclogite (1)
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metaigneous rocks
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serpentinite (1)
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metasomatic rocks
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serpentinite (1)
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minerals
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halides
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chlorides
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halite (1)
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Primary terms
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absolute age (2)
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Africa
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Southern Africa
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South Africa (1)
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Antarctica
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Antarctic Peninsula (1)
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South Shetland Islands (1)
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Arctic region
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Greenland (1)
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Asia
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Far East
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China (1)
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Siberia (1)
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Canada (1)
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crust (3)
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geochemistry (1)
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igneous rocks
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kimberlite (1)
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plutonic rocks
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alnoite (2)
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gabbros (1)
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ultramafics
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peridotites
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dunite (1)
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spinel lherzolite (1)
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-
-
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volcanic rocks
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basalts (2)
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-
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inclusions (2)
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isotopes
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radioactive isotopes
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
-
stable isotopes
-
Hf-177/Hf-176 (1)
-
Nd-144/Nd-143 (2)
-
Os-188/Os-187 (1)
-
Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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Sr-87/Sr-86 (2)
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magmas (1)
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mantle (3)
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Mesozoic
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Jurassic (1)
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metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (2)
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-
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hafnium
-
Hf-177/Hf-176 (1)
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lead
-
Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
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platinum group
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osmium
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Os-188/Os-187 (1)
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-
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rare earths
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neodymium
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Nd-144/Nd-143 (2)
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-
-
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metamorphic rocks
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eclogite (1)
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metaigneous rocks
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serpentinite (1)
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metasomatic rocks
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serpentinite (1)
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-
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metasomatism (2)
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Oceania
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Melanesia
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Malaita (2)
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-
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Pacific Ocean
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East Pacific
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Southeast Pacific
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Manihiki Plateau (1)
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-
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South Pacific
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Southeast Pacific
-
Manihiki Plateau (1)
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-
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West Pacific
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Ontong Java Plateau (2)
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-
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Paleozoic
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lower Paleozoic (1)
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plate tectonics (2)
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Precambrian
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upper Precambrian
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Proterozoic
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Mesoproterozoic (1)
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-
-
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Solomon Islands (2)
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South America
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Brazil (1)
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Highly refractory dunite formation at Gibbs Island and Bruce Bank, and its role in the evolution of the circum-Antarctic continent
Halogen heterogeneity in the subcontinental lithospheric mantle revealed by I/Br ratios in kimberlites and their mantle xenoliths from South Africa, Greenland, China, Siberia, Canada, and Brazil
The few geological and geophysical studies of the Lyra Basin at the western margin of the Ontong Java Plateau (OJP; Pacific Ocean) revealed that it is underlain by thicker than normal oceanic crust. The unusually thick oceanic crust is attributed to the emplacement of massive lava flows from the OJP. Dredging was conducted to sample the inferred OJP crust on the Lyra Basin but instead recovered younger extrusives that may have covered the older plateau lavas in the area. The Lyra Basin extrusives are alkalic basalts with ( 87 Sr/ 86 Sr) t = 0.704513–0.705105, ( 143 Nd/ 144 Nd) t = 0.512709–0.512749, ε Nd (t) = +3.0 to +3.8, ( 206 Pb/ 204 Pb) t = 18.488–18.722, ( 207 Pb/ 204 Pb) t = 15.558–15.577, and ( 208 Pb/ 204 Pb) t = 38.467–38.680 that are distinct from those of the OJP tholeiites. They have age-corrected ( 187 Os/ 188 Os) t = 0.1263–0.1838 that overlap with the range of values determined for the Kroenke-type and Kwaimbaita-type OJP basalts, but their ( 176 Hf/ 177 Hf) t = 0.28295–0.28299 and ε Hf (t) = +7.9 to +9.3 values are lower. These isotopic compositions do not match those of any Polynesian ocean island volcanics. Instead, the Lyra Basin basalts have geochemical affinity and isotopic compositions that overlap with those of some alkalic suite and alnöites in the island of Malaita, Solomon Islands. Although not directly related to the main plateau volcanism at 120 Ma, the geochemical data and modeling suggest that the origin of the Lyra Basin alkalic rocks may be genetically linked to the mantle preserved in the OJP thick lithospheric root, with magmatic contribution from the Rarotongan hotspot.