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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Far East
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Japan
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Hokkaido (1)
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Honshu
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Chiba Peninsula (1)
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Indian Ocean
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Mid-Indian Ridge
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Central Indian Ridge (1)
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Oceania
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Melanesia
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Malaita (1)
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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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North Pacific
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Northwest Pacific
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Izu-Bonin Arc (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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Northwest Pacific
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Ontong Java Plateau (1)
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elements, isotopes
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isotope ratios (4)
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isotopes
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Pb-207/Pb-204 (1)
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stable isotopes
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Nd-144/Nd-143 (1)
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O-18/O-16 (1)
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Os-188/Os-187 (2)
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metals
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strontium
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hafnium
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lead
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Pb-208/Pb-204 (1)
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platinum group
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osmium
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rare earths
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neodymium
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Primary terms
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absolute age (1)
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Asia
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Far East
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Japan
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Hokkaido (1)
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Honshu
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Chiba Peninsula (1)
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Cenozoic
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Quaternary
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upper Quaternary
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upper Cenozoic (1)
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crust (3)
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geochemistry (3)
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igneous rocks
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harzburgite (1)
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volcanic rocks
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andesites
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boninite (1)
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basalts
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mid-ocean ridge basalts (1)
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tholeiite (1)
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tholeiitic basalt (1)
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pyroclastics
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hyaloclastite (1)
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Indian Ocean
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Mid-Indian Ridge
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Central Indian Ridge (1)
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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)
-
-
stable isotopes
-
Hf-177/Hf-176 (1)
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Nd-144/Nd-143 (1)
-
O-18/O-16 (1)
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Os-188/Os-187 (2)
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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 (1)
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lava (2)
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magmas (2)
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mantle (1)
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Mesozoic
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Jurassic
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Upper Jurassic (1)
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metals
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alkaline earth metals
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magnesium (1)
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strontium
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Sr-87/Sr-86 (1)
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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 (2)
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rare earths
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neodymium
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Nd-144/Nd-143 (1)
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rhenium (1)
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Oceania
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Melanesia
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Malaita (1)
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oxygen
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O-18/O-16 (1)
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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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North Pacific
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Northwest Pacific
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Izu-Bonin Arc (1)
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-
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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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Northwest Pacific
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Izu-Bonin Arc (1)
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Ontong Java Plateau (1)
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paleomagnetism (1)
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plate tectonics (1)
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sediments
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clastic sediments
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sand (1)
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marine sediments (1)
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Solomon Islands (1)
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West Pacific Ocean Islands
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Bonin Islands (1)
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sediments
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sediments
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clastic sediments
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sand (1)
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marine sediments (1)
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Rhenium-osmium isotope fractionation at the oceanic crust-mantle boundary
Age of Matuyama-Brunhes boundary constrained by U-Pb zircon dating of a widespread tephra
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.