4 edition of Origin and evolution of the Ontong Java Plateau found in the catalog.
Includes bibliographical references and index.
|Statement||edited by J. Godfrey Fitton ... [et al.].|
|Series||Geological Society special publication ;, no. 229|
|Contributions||Fitton, J. G.|
|LC Classifications||QE350.4 .O75 2004|
|The Physical Object|
|Pagination||vi, 374 p. :|
|Number of Pages||374|
|LC Control Number||2004484990|
Early Aptian greenhouse or super-greenhouse conditions were followed by prolonged cooling during the late Aptian, when OJP and SKP developed, respectively. Not even a white missionary has landed on its shore. One critical research need was for samples from the crust that forms the OJP—what geologists call the igneous basement. This scenario is only likely if the present southern Pacific is the site of Rodinia fragmentation. There is some evidence that they are the result of more recent, and much smaller scale, volcanic activity. The basaltic clasts have compositions similar to that of their host rocks and are therefore probably cognate.
The scientific ocean drilling program samples came from the upper portion of the basement, but the magma layer that forms the plateau is some 35 or more kilometers thick, so a huge portion of it had never been studied. Get Permissions Abstract The discovery of a thick The mantle plume that produced the Ontong Java Plateau is called the Louisville hotspot. In fact, almost none of the plateau had ever been mapped in high resolution save for a few slices done across the southern end in preparation for laying telecommunications cables between Australia and Asia years back.
The total release would have had to be a million times larger than the largest volcanic eruption in recorded history. The 40ArAr weighted mean age of Lyra Basin basalts is This age is interesting because it is much younger than the main stage of OJP formation Ma and no ca. The mapping around the atolls could also tell another component of the larger OJP story. Click here or on image to enlarge. You could not be signed in.
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You could not be signed in. Show More Why the Mystery? Get Permissions Abstract The discovery of a thick This suggests that the rock originated from normative quartz-rich basaltic material, most likely ancient crust stored in the Pacific convective mantle.
Click here or on Figure for enlargement. Sager ; Clive R. Experimental investigations suggest that sinking basaltic crust, except for the coldest slabs, are likely to be gravitationally trapped at the base of the mantle transition zone e.
Senda, R. Massive volcanism occurring at equatorial versus high paleolatitudes and submarine versus subaerial settings triggered very different climate responses but similar disruptions in the marine carbonate system.
If the hypothesis of secular cooling is valid, Proterozoic subducting slabs with high geothermal gradients might have frequently undergone elemental redistribution by partial anatexis. This indicates that isolation of the garnet pyroxenites from the convective mantle occurred between and 34 Ma, probably associated with the Ma plateau emplacement.
The unusually thick oceanic crust is attributed to the emplacement of massive lava fl ows from the OJP. Note that the large uncertainty of clinopyroxene-melt U, Th and Pb partitioning impedes the assessment of the Pb isotope evolution before Ma.
Thermobarometric analyses of the suites of garnet pyroxenite xenoliths reveal derivation from the bottom of the lithosphere km depth; Ishikawa et al.
For this purpose, geochemical modeling should be revisited, taking into account the contribution of recycled materials combined with reasonable extents of heterogeneity. Thus, the isotopic characteristics of the BGC are best explained if the primary enriched signatures of the rocks were largely obscured by the melt-mediated reaction against ambient peridotite with depleted isotopic characteristics.
From these considerations, we envisage that protolith formation and subsequent subduction or delamination of the QGC occurred during the Neoproterozoic era, at 0.
There is some evidence that they are the result of more recent, and much smaller scale, volcanic activity. There are two main villages where the population is concentrated with 1, on the island of Luaniua in the eastern end and on Pelau in the northeast.
If this hypothesis is valid, the timing of removal of the lower crust into the underlying mantle can be bound by the minimum isolation age of 0.
In the past, when sea levels were lower, more of the Origin and evolution of the Ontong Java Plateau book were exposed and water running off that exposed land might have carved the canyon. Still, such work Origin and evolution of the Ontong Java Plateau book yielded a surprising story.
However, their nature, origin, recycling timescales and even their existence remain controversial because the determination of the magma sources is not straightforward. This age is interesting because it is much younger than the main stage of OJP formation Ma and no ca. Click here or on image to enlarge.
The group hoped to identify rock outcroppings around the base of the islands where they could collect samples to determine age and other information to help answer the question. Early Aptian greenhouse or super-greenhouse conditions were followed by prolonged cooling during the late Aptian, when OJP and SKP developed, respectively.
Neal, T.Origin and evolution of magmas on the Ontong Java Plateau J. GODFREY FITTON 1 & MARGUERITE GODARD 2 1School of GeoSciences, University of. The Ontong Java Plateau is a huge oceanic plateau located in the southwestern Pacific Ocean, north of the Solomon Islands.
The OJP was emplaced around million years ago with a much smaller volcanic event around 90 Ma. Two other southwestern Pacific plateaus, Manihiki and Hikurangi, now separated from the OJP by Cretaceous ocean basins, are of similar age and composition and.
Ontong Java Plateau; Oceanic anoxic events and Cretaceous environmental perturbations. Summary "Gathers together papers focused on understanding oceanic large igneous provinces from their origin and evolution to environmental impacts.
Research presented has made extensive use of dredge samples and cores collected by scientific ocean drilling.ORIGIN AND Pdf OF ONTONG JAVA PLATEAU Fig. 1. Etopo 5 predicted pdf (in meters) of the western Paciﬁc Basin (after Smith & Sandwell, ), centered on the Ontong Java Plateau.
The Solomon Islands are at the plateau’s southwestern margin. Also shown are the locations of ODP Sites, andwhere.Origin and Evolution of the Ontong Java Plateau, Spec. Publ. Chapter (PDF Available) in Geological Society London Special Publications (1) · January with Reads.Jan 30, · Large igneous provinces (LIPs), commonly ebook to result ebook ascending mantle plumes, represent the dominant form of volcanism in our solar magicechomusic.com Earth, the largest known flood basalt province is the Ontong Java Plateau (OJP), which together with neighboring ocean basin flood basalts comprise the ‘greater OJP’, encompassing ×10 6 km 2, or ∼%, of the Earth’s surface ().Cited by: