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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: Bohrson et al. as mentioned in this paper showed that sediment-covered portion continental crustal rocks facilitate assimilation that can of the trough are significantly enriched in incompatible elements, can be easily identified, and the extent to which basaltic and Sr, Nd and Pb isotopic ratios are shifted toward the composition magmas are contaminated by oceanic crust is a topic of local sediments.
Abstract: Mid-ocean ridge basalts (MORBs) erupted in Escanaba Trough, INTRODUCTION the southernmost segment of the Gorda Ridge, have greater isotopic Crustal contamination of basaltic magmas is generally and geochemical variability than those from the remainder of the recognized for continental volcanoes (e.g. Taylor, 1980; ridge. Samples from the sediment-free northern sites in the trough Leeman & Hawkesworth, 1986; Glazner et al., 1991). The are depleted normal-MORB similar to those from the northern composition, thickness, and low melting temperatures of Gorda Ridge. However, samples from the sediment-covered portion continental crustal rocks facilitate assimilation that can of the trough are significantly enriched in incompatible elements, be easily identified. However, the extent to which basaltic and Sr, Nd and Pb isotopic ratios are shifted toward the composition magmas are contaminated by oceanic crust is a topic of of local sediments. Pb isotopic ratios, in particular, lie on a mixing intense debate (e.g. Bohrson & Reid, 1995; Clague et al., line with local sediments. Assimilation–fractional crystallization 1995; Eiler et al., 1996; Bohrson et al., 1996, and references (AFC) calculations suggest that 25–40% fractional crystallization therein; Thirlwall et al., 1997). The debate has focused coupled with assimilation of 1–2% of local sediments can produce on distinguishing the chemical characteristics magmas the enrichment observed for some Escanaba basalts. Variations in acquire during ascent, crustal storage, and emplacement the amount of enrichment of elements with similar incompatibility from those that have been used to identify heterogeneous for comparably differentiated basalts, and uncorrelated isotopic mantle sources. For most ocean island volcanoes, the ratios suggest variable amounts of assimilation of compositionally crustal components available to serve as contaminants heterogeneous assimilants by parental magmas. Assimilation of are poorly characterized, but include the underlying sediment by MORB magmas probably resulted when laccolithic altered oceanic crust, pelagic to hemipelagic sediment, intrusions ponded at the sediment–basement interface beneath the and the hydrothermally altered volcanic edifice. thick sediment cover in the southern part of Escanaba Trough. Mid-ocean ridge basalts (MORBs) are relatively uniGeochemical and isotopic evidence for contamination can be detected form geochemically with depleted incompatible element in these lavas because of the strong compositional contrast between and radiogenic isotope compositions compared with lavas the parental magma and assimilant. The depleted MORB magma from ocean island or continental volcanoes. However, and highly enriched sediment assimilant are end-member comexcess chlorine content and Cl/K ratios in fresh MORB positions that provide a sensitive indicator for the smallest amount glasses support the idea that MORB magmas may also of contamination of oceanic magma by crustal processes. be affected by assimilation of hydrothermally altered oceanic crust (e.g. Michael & Schilling, 1988; Michael & Cornell, 1996). Chlorine, like other incompatible elements, shows the greatest enrichment in strongly frac

20 citations

Journal ArticleDOI
TL;DR: In this paper, carbonate and silicate-rich globules and andradite from the Wajilitage kimberlitic rocks in the northwestern Tarim large igneous province, NW China were reported.

20 citations

Journal ArticleDOI
TL;DR: Soltan Maidan Basaltic Complex with thickness up to about 1300m is located in the eastern Alborz zone, north of Iran as mentioned in this paper, and is dominantly composed of transitional to mildly alkaline basaltic lava flows, agglomerates and tuffs, together with a few thin sedimentary interlayers.
Abstract: Soltan Maidan Basaltic Complex with thickness up to about 1300 m is located in the eastern Alborz zone, north of Iran. This complex is dominantly composed of transitional to mildly alkaline basaltic lava flows, agglomerates and tuffs, together with a few thin sedimentary interlayers. Field geological evidence and study of palynomorph assemblages in the shale interlayer show Late Ordovician to Early Late Silurian ages. Chondrite- and primitive-mantle normalized multi-element patterns of Soltan Maidan basalts demonstrate enrichment in highly incompatible elements relative to less incompatible ones and their patterns are most similar to OIB. Trace elemental and Sr-Nd isotopic compositions indicate interaction and mixing of asthenospheric mantle source (OIB-type) with enriched subcontinental lithospheric mantle components (EM1-type). This asthenosphere-lithosphere interaction occurred in an extensional continental setting, which resulted in opening of the Paleotethys Ocean in the north of Gondwana during the Late Silurian to Middle Devonian.

20 citations

Journal Article
TL;DR: The major-, trace-element and Sr-Nd-Pb isotopic ratios of 21 Late-Cenozoic basalts from Leiqiong area were determined by wet chemical method, ICP-MS and MC-IPCMS,respetively as mentioned in this paper.
Abstract: The major-,trace-element and Sr-Nd-Pb isotopic ratios of 21 Late-Cenozoic basalts from Leiqiong area were determined by wet chemical method,ICP-MS and MC-IPCMS,respetively.Normative mineral calculation suggested that Leiqiong basalts were dominated by quartz tholeiites with subsidiary olivine tholeiites and alkaline basalts.The trace elements and isotopic composition of these basalts resembled OIBs.In addition,the incompatible elements abundance increased with increasing SiO_2-undersaturation.The chemical and isotopic compositions of most basalts might be inherited from their mantle source except that sample R4-1 showed characteristics of crustal contamination.The positive correlation between ~(87)Sr/~(86) Sr and ~(206)Pb/~(204)Pb as well as negative correlation between ~(143)Nd/~(144)Nd and ~(206)Pb/~(204)Pb implied a mixing of a depleted asthenospheric mantle and an EM2 composition(existing in the sub-continental lithosphere mantle beneath this region).The even more depleted Sr and Nd isotope of mantle xenoliths from Leiqiong than their host basalts indicated that the spinel peridotite mantle represented by the xenoliths could never produce these basaltic rocks. The La/Yb-Sm/Yb system of Leiqiong basalts required that the melting occurred in the garnet peridotite and in turn implied the EM2 composition should be derived from the lower lithosphere mantle(garnet phase stable field).The geochemical diversity of Leiqiong basalts could be interpreted as follows:The low degree of melt(7%~9%) from upwelling asthenospheric mantle and garnet peridotite mantle produced the alkaline basalts and olivine tholeiites while relatively higher degree of melt(10%~20%) from asthenospheric mantle and a higher proportion of garnet peridotite mantle made the quartz tholeiites.

20 citations

Journal ArticleDOI
TL;DR: This paper measured major and trace elements and volatile components in melt inclusions in olivine from fresh 2.7 Ga old komatiites from the Reliance Formation of the Belingwe Greenstone Belt, Zimbabwe.

20 citations


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