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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 total PGE amounts of mantle peridotites in the Dazhuka ophiolite, Tibet, are 28.37-50.67 ng/g as mentioned in this paper.
Abstract: The total PGE amounts of mantle peridotites in the Dazhuka ophiolite, Tibet, are 28.37–50.67 ng/g, slightly higher than those of mantle peridotites in the primitive mantle, and typical ophiolites in the world, and the Alps-type mantle peridotites. The PGE distribution patterns in the Dazhuka mantle peridotites are also different from those of the mantle peridotites of partial melting relict origin. The Dazhuka mantle peridotites have relatively high total PGE amounts and are enriched in Pt, Pd, and Ru. Their PGE distribution patterns belong to the positively inclinedor swallow-type patterns. The PGE distribution patterns in the mantle peridotites of partial melting relict origin belong to the negative-slope patterns or flat patterns. This reflects the unique features of the upper mantle in this region. Relative enrichment in Pt and Pd, as well as in the incompatible elements Cu, Au, Cs, Rb, Ba, Th, U and LREE, indicates that the partial melting-derived relict mantle peridotites in the Dazhuka ophiolite had experienced intensive permeating and mixing processes of the melt and fluid both containing abundant incompatible elements.

6 citations

Journal ArticleDOI
01 Jul 2017-Lithos
TL;DR: The Karaj Dam basement sill is a 460m-thick saucer-shaped saucer shaped sill, situated in the Alborz Magmatic Belt, Northern Iran.

6 citations

Journal Article
TL;DR: The volcanic rocks of Benbatu Formation in Sonid Youqi mainly consist of basaltic-andesite and andesite with a little dacite as discussed by the authors.
Abstract: The volcanic rocks of Benbatu Formation in Sonid Youqi mainly consist of basaltic-andesite and andesite with a little daciteZircon U——Pb isotopic dating reveals the andesite formed in 3009±16 MaThe volcanic rocks generally belong to the tholeiitic series with low K and comparatively high Fe in geochemical characteristicsTrace elements are characterized by REE weak fractionation,incompatible elements(Th,U,La,Ce) enrichment and HFSE(Nb,Ta,Ti) depletion,which is similar to the StKitts island arc volcanic rocksThe rocks of Benbatu Formation show Eu in negative anomaly and Sr in low content,indicating the magma evolution experienced plagioclase fractional crystallization,which also led to the rocks poor in Al and rich in NaThe volcanic rocks of Benbatu Formation in Sonid Youqi area originated from the partial melting by the subduction of mantle wedge,and the formation of the rocks is related to the subduction of Paleo-Asian Ocean plate

6 citations

Journal ArticleDOI
TL;DR: Based on a detailed field geological, petrological, geochemical and geochronological study, the authors focused on diorites in the Pengshan area located at the northwestern margin of the Jiangnan orogenic belt.
Abstract: Magmatic activities associated with tectonic events play a significant role in understanding the evolution of an orogenic belt. The Jiangnan orogenic belt has been regarded as the collisional suture zone between the Yangtze Block and the Cathaysia Block. Although the magmatic activities during the period of intra-plate extension after the collision have been well studied in recent years, some remaining issues, including source nature and geodynamic mechanism, need to be further addressed. In this paper, based on a detailed field geological, petrological, geochemical and geochronological study, we focus our work on diorites in the Pengshan area located at the northwestern margin of the Jiangnan orogenic belt. The mineral assemblages are mainly composed of plagioclase (55 vol.%-65 vol.%) and hornblende (35 vol.%-45 vol.%). One diorite sample yields zircon 206Pb/238U mean age of 768±8 Ma (MSWD=0.29). The diorites have enriched large ion lithophile elements (Ba, K and Rb) and incompatible elements (Th and U), and are depleted in high field-strength elements including Ta, Ti and Nb. Diorites in this study have relatively high MgO content (6.56 wt.%-7.58 wt.%, 7.07 wt.% on average) and Mg number values (65-67, 65.8 on average). The diorites are metaluminous, high K calc-alkaline series rocks with high contents of K2O (1.59 wt.%-1.97 wt.%) and total alkali (Na2O+K2O=5.56 wt.%-6.05 wt.%). The Nd/Th ratio (4.34-5.27) is higher than that of crust-derived rocks and lower than mantle-derived rocks. The Rb/Sr ratio (0.19-0.22) is slightly lower than crust, but significantly higher than upper mantle. Based on the above geochemical and geochronological analyses, we suggest that the diorites in the Pengshan area were mainly derived from crustal materials with a small amount of mantle-originated materials involved, and possibly produced from an extensional tectonic setting after the collision between the Yangtze Block and Cathaysia Block.

6 citations

Journal Article
Chen Xiayu1
TL;DR: In this paper, a case study of the Cenozoic basalts in Shandong Province,eastern China, was provided to discuss the genesis of continental basalts. But the authors only focused on the early three parallel volcanic belts and the late small and isolated volcanoes.
Abstract: Geochemically,continental alkaline basalts are similar to those oceanic island basalts,and are viewed as the representative of intraplate basalts in continents.Here we provide a case study of the Cenozoic basalts in Shandong Province,eastern China,to discuss the genesis of continental basalts.Spatially,the Cenozoic basalts can be divided into two kinds,the early three parallel volcanic belts and the late small and isolated volcanoes.The three belts including the Weifang belt and the Yishui belt in western Shandong,and the Penglai belt in eastern Shandong are less alkaline and are mainly composed of alkali olivine basalts and basanites,which show broad ranges of incompatible element ratios and isotopic values.The small and isolated volcanoes are more alkaline and are mainly composed of basanites and nephenilites,which are more homogenous in incompatible element ratios and isotopic values.Therefore,compared with oceanic island basalts,the parallel volcanic belts in Shandong can be regarded as shield-building stage basalts,while the small and isolated volcanoes correspond to the posterosional or rejuvenescent basalts.On the isotopic plots of Sr vs.Nd and Nd vs.Hf,both the Weifang belt and the Yishui belt show a two-endmember mixing array.However,there is minor difference of the enriched endmembers of these two arrays.The enriched endmembers are characterized by smaller Ce/Pb and elevated Ba/Th ratios,suggesting a signature of lower continental crust.However,such materials have much lower Th/La ratios and have excess radiogenic Hf contents relative to radiogenic Nd.Such geochemical signatures cannot be produced by assimilation of lower continental crust but by recycled lower continental crust(eclogite or garnet pyroxenite),which had undergone early melting in the mantle.The different arrays in isotopic plots of the two belts are alike those of the KEA chain and the LOA chain of Hawaii islands.Therefore,we propose that the parallel volcanic belts of Shandong be attributed to the plume activity and the recycled lower continental crust be important components of the plume.Geochemically,basanites and nepheninites of the late small and isolated volcanoes share many signatures with the carbonatite,e.g.the depletion of K,Pb,Zr,Hf,Ti in the primitive mantle-normalized grams.Therefore,we conclude that their mantle sources have been carbonated recently.The moderately depleted Sr,Nd,Hf isotopic compositions of these alkaline rocks indicate that the carbonated liquids might be derived from recycled young(Mesozoic?) oceanic crust.

6 citations


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