Analysis of Ontong Java Plateau palaeolatitudes: evidence for large-scale rotation since 123 Ma?
نویسندگان
چکیده
منابع مشابه
Multiple-ScS probing of the Ontong-Java Plateau
We use multiple-ScS phases recorded at Pohnpei from a 1996 deep earthquake under the Solomon Islands to investigate the shear velocity and attenuation characteristics of the upper mantle under the Ontong-Java Plateau in the Western Equatorial Pacific. Cross-correlation results indicate a vertical one-way travel-time under the plateau 3 s slow with respect to PREM, in agreement with previously o...
متن کاملRayleigh–wave tomography of the Ontong–Java Plateau
Ž . The deep structure of the Ontong–Java Plateau OJP in the westcentral Pacific is investigated through a 2-year deployment of four PASSCAL seismic stations used in a passive tomographic experiment. Single-path inversions of 230 Rayleigh waveforms from 140 earthquakes mainly located in the Solomon Trench confirm the presence of an extremely Ž . thick crust, with an average depth to the Mohorov...
متن کاملVelocity–depth ambiguity and the seismic structure of large igneous provinces: a case study from the Ontong Java Plateau
S U M M A R Y The seismic structure of large igneous provinces provides unique constraints on the nature of their parental mantle, allowing us to investigate past mantle dynamics from present crustal structure. To exploit this crust–mantle connection, however, it is prerequisite to quantify the uncertainty of a crustal velocity model, as it could suffer from considerable velocity–depth ambiguit...
متن کاملRapid formation of ontong java plateau by aptian mantle plume volcanism.
The timing of flood basalt volcanism associated with formation of the Ontong Java Plateau (OJP) is estimated from paleomagnetic and paleontologic data. Much of OJP formed rapidly in less than 3 million years during the early Aptian, at the beginning of the Cretaceous Normal Polarity Superchron. Crustal emplacement rates are inferred to have been several times those of the Deccan Traps. These es...
متن کاملCretaceous Planktonic Foraminifers and Depositional Environments from the Ontong Java Plateau with Emphasis on Sites
Cretaceous planktonic foraminifers from Ocean Drilling Program (ODP) Leg 130 consist of two age groups: one dominantly Aptian in age and the other dominantly Maastrichtian. The oldest dated sediments from Ontong Java Plateau occur at ODP Site 807 and are assigned to the early Aptian Globigerinelloides blowi Zone. The assemblage correlates closely with Aptian foraminifers from Deep Sea Drilling ...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 2013
ISSN: 0956-540X,1365-246X
DOI: 10.1093/gji/ggt075