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Incompatible element

About: Incompatible element is a research topic. Over the lifetime, 2420 publications have been published within this topic receiving 154052 citations.


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TL;DR: The authors in this paper suggested that these minerals could be added metasomatically to the mantle through hybridization by percolating slab melts, during which Nb and Ti are preferentially extracted from the adakitic melts.
Abstract: The Pliocene-Pleistocene magmatic activity of the ^amboanga arc is linked to the southward subduction of the Oligocene-Miocene Sulu Sea back-arc basin along the Sulu Trench. The magmatic products include small amounts ofadakites datedfrom 3-8 to 0-7 Ma, abundant Nb-enriched basalts and basaltic andesites (NEB) datedfrom 2 to 1 Ma and a lone calc-alkaline potassic basaltic andesite dated at 0 4 Ma. Three kinds of NEB are distinguished: nearly primitive Mg-rich (MG) basalts displaying positive or no Nb anomalies with respect to adjacent incompatible elements and more evolved low-K (LK) and calcalkaline (CA) lavas which, despite their Nb enrichment, display negative Nb anomalies. Although the role of OIB-type mantle components has been advocated to explain the HFSE enrichment of NEB, the spatial and temporal association of these rocks with adakites suggests a petrogenetic link between them. Trace element characteristics of the NEB imply that amphibole and ilmenite might be present in their source. We suggest that these minerals could be added metasomatically to the mantle through hybridization by percolating slab melts, during which Nb and Ti are preferentially extracted from the adakitic melts. In an early stage (4—3 Ma) of the subduction of the young and hot Sulu Sea basin crust beneath the ^jimboanga peninsula, adakitic liquids formed at depths of 75-85 km. A few of them were emplaced at the surface but most were consumed through slab melt—mantle metasomatic reactions. Adakite production and emplacement continued later (<2 Ma), while the Nb-enriched mantle was brought by convection to depths that allowed its melting and the subsequent emplacement of NEB behind the adakitic front of the ^pmboanga arc

409 citations

Journal ArticleDOI
TL;DR: In this article, the Nd, Sr, and Pb isotopic characteristics of MORBs are explained on the basis of this model, which provides a future source region of mid-ocean ridge basalt magmas on a timescale of 10 years.
Abstract: Mantle pyrolite differentiates at mid-oceanic ridges to form a layered lithosphere consisting of a basaltic crust, immediately underlain by harzburgite and further underlain by pyrolite which has experienced depletion only of highly incompatible elements (e.g., Rb, light REE). The body forces driving subduction are concentrated mainly in the upper cool, brittle layer of lithosphere, comprised of basalt and harzburgite. The lower layer of relatively ductile pyrolite is stripped off during subduction and resorbed into the upper mantle. This material, which is depleted in highly incompatible elements, provides a future source region of mid-ocean ridge basalt magmas on a timescale of 10⁹ years. The Nd, Sr, and Pb isotopic characteristics of MORBs are explained on the basis of this model. The slab, which sinks to ~600 km, is comprised mainly of former basalt and harzburgite. These differentiated layers undergo a significantly different series of phase transformations to those experienced by mantle pyrolite. Th...

408 citations

Journal ArticleDOI
TL;DR: In this paper, immobility in hydrothermal alteration and metamorphism provides useful lithogeochemical parameters for mineral exploration in greenstone terranes, which are illustrated on maps and diagrams, and otherwise used in exploration.

407 citations

Journal ArticleDOI
TL;DR: In this article, it was shown that the variability in highly incompatible trace element ratios in ocean island basalts (OIB) from the central Atlantic extend to relatively enriched and fractionated compositions in regions of older oceanic lithosphere.

406 citations

Journal ArticleDOI
TL;DR: In this paper, the authors show the first case of highly significant correlations of Nb/U, Ba/Nb and Ba/Th with87Sr/86Sr for Indian Ocean mid-ocean ridge basalts and confirm and strengthen a previously detected correlation with Ce/Pb (or Nd/PB) in nine hand picked MORB glasses from the Central Indian and Carlsberg Ridge.

404 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20237
202216
202157
202056
201960
201851