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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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Journal ArticleDOI
TL;DR: In this article, the Rano Rahi seamount field has been used to define a Nd-Pb-Sr isotopic array that connects, and substantially overlaps, the arrays of the nearby East Pacific Rise axis and 5.6-28 Ma lavas of the Pukapuka ridge system.
Abstract: [1] Lavas of the Rano Rahi seamount field define a Nd-Pb-Sr isotopic array that connects, and substantially overlaps, the arrays of the nearby East Pacific Rise axis and 5.6–28 Ma lavas of the Pukapuka ridge system, situated between the seamount field and French Polynesia. Dating of Rano Rahi samples by 40Ar-39Ar incremental heating methods yields ages between 0.23 and 4.67 Ma. Most of the dated lavas were erupted within 60 km of the axis, and no systematic isotopic variation with age is observed. The isotopic and incompatible element data indicate a persistent two-component mantle source comprising variable proportions of normal Pacific ocean-ridge-type mantle and a “C”-like Pukapuka end-member with lower ɛNd, higher 87Sr/86Sr and 206Pb/204Pb, and relative enrichment in the highly incompatible elements. The Rano Rahi data reveal peaks of low ɛNd, high 87Sr/86Sr, and high 206Pb/204Pb at about 16°–17°S and 18.5°–19°S that appear to correspond to two concentrations of C-rich mantle, probably streaming eastward from French Polynesia. The northern stream may have reached the axis more recently and/or be less continuous than the southern stream.

22 citations

Journal ArticleDOI
TL;DR: Based on the temporal-spatial distribution and geochemical characteristics, the Emeishan basalts can be divided into two types: high-P2O-TiO2 basalt (HPT) and low-P 2O5 -TiO 2 basalt(LPT) as mentioned in this paper.
Abstract: Based on the temporal-spatial distribution and geochemical characteristics, the Emeishan basalts can be divided into two types: high-P2O-TiO2 basalt (HPT) and low-P2O5-TiO2 basalt (LPT), which differ distinctly in geochemistry: the LPTs are characterized by relatively high abundances of MgO, total FeO and P2O5 and compatible elements (Cr, Ni, Sc), and relatively low contents of moderately compatible elements (V, Y, Yb, Co), LREE and other incompatible elements compared with the HPT. On the diagrams of trace element ratios, they are plotted on an approximately linear mixing line between depleted and enriched mantle sources, suggesting that these two types of basalts resulted from interactions of varying degrees between mantle plume and lithospheric mantle containing such volatile-rich minerals as amphibole and apatite. The source region of the LPT involves a smaller proportion of lithospheric components, while that of the HTP has a larger proportion of lithospheric components. Trachyte is generated by partial melting of the basic igneous rocks at the base of the lower continental crust. Both the two types of magmas underwent certain crystal fractionation and contamination of the lower crust at high-level magma chambers and en route to the surface.

22 citations

Book ChapterDOI
16 Mar 2013
TL;DR: In this paper, a classification of low partition coefficient elements is presented (Sc, Ti, V, Y, Zr, Nb, La-Tb, Hf, Ta, Th).
Abstract: .-Alkali metals prove to be very sensitive to alteration process even if this process is moderate. It is very difficult to use these elements to trace magmatic processes since their concentration may Vary within an homogeneous unaltered unit. From all the basaltic units investigated, a classification of low partition coefficient elements is presented (Sc, Ti, V, Y, Zr, Nb, La-Tb , Hf, Ta, Th) . The incompatible elements ratios (Y/Tb, Zr/Hf, Nb/Ta) are constant in the samples studied and are nearly equal to the same ratios in chondrites. This is consistent with the existence of an homogeneous primordial mantle at the scale of the North Atlantic, compatible with a chondritic composition of the earth. [NOT CONTROLLED OCR]

22 citations

Journal ArticleDOI
TL;DR: In this paper, two mineralogically and geochemically distinct subalkaline basic-intermediate dyke suites are spatially closely associated in the northern portions of the Arabian-Nubian Shield.

22 citations

Journal ArticleDOI
TL;DR: The Montgenevre ophiolite complex is one of the best preserved tectonic units in the Alps as mentioned in this paper, and it exhibits a very wide compositional range from troctolite to evolved ferrogabbro and albititic rocks.
Abstract: The Montgenevre ophiolite complex is one of the best preserved in the Alps. Ultramafic, gabbroic and basaltic rocks occur as distinct tectonic units. Fifty-four representative samples from the gabbroic and the volcanic rocks have been analysed. The gabbroic sequence exhibits a very wide compositional range from troctolite to evolved ferrogabbro and albititic rocks. The volcanic sequence, which is mostly composed of pillowed basalts, is characterized by its rather small compositional range. Both the gabbroic and volcanic sequences show typical tholeiitic differentiation trends. The results are discussed using the following variation diagrams: MgO versus Ti0₂, Ni versus Ti0₂, Ti/1000 versus V, Sc versus Ni, Zr versus Y and Zr versus Zr/Y. In the first three, the gabbros and basalts obviously show distinctive differentation trends, whereas a similar trend is observed in the last three. This observation is interpreted as reflecting crystallization of comparable melts under different P, T and oxygen fugacity conditions. The early stage of differentiation is characterized by fractionation of olivine, spinel, clinopyroxene and plagioclase within a rather closed system. Part of the melt crystallized as troctolites and olivine-rich-gabbros, and partly as clinopyroxene gabbros. There is no evidence that part of the deep-seated "gabbroic melt" has escaped to higher levels to crystallize as basalts. During crystallization of clinopyroxene gabbros, Fe and Ti are drastically enriched in the residual melt. Within the same system, and probably at deeper crustal levels (≥ 2 kb), ferrogabbros could crystallize from this residual melt. The appearance of amphibole, however, indicates infiltration of H₂O and possibly also an increase in oxygen fugacity. In the final stage of differentiation, a small volume of remaining melt, enriched in Si0₂, Na₂O and incompatible elements, crystallized as albititic dikes within the gabbroic sequence. The basalts exhibit characteristics clearly indicating a magmatic origin comparable to MORB. Major and trace element data from the volcanic and plutonic rocks sugggest an independent magmatic evolution for the gabbroic and basaltic sequences. This conclusion is supported by field relations that show basaltic dikes to crosscut the gabbroic sequence.

22 citations


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