Pyroxenite in the mantle source of basanites at the Youkou maar, Adamawa Volcanic Massif (Cameroon Volcanic Line, West Africa)
Sign Up to like & getrecommendations! Published in 2021 at "Chemical Geology"
DOI: 10.1016/j.chemgeo.2021.120478
Abstract: Abstract The Adamawa Volcanic Massif of the Cameroon Volcanic Line (CVL) is dominated by silica-undersaturated basaltic lavas, which have been attributed to plume volcanism. However, the relative contributions of peridotite and pyroxenite sources have not… read more here.
Keywords: volcanic massif; mantle source; cameroon volcanic; adamawa volcanic ... See more keywords
Markov chain Monte Carlo inversion of mantle temperature and source composition, with application to Reykjanes Peninsula, Iceland
Sign Up to like & getrecommendations! Published in 2020 at "Earth and Planetary Science Letters"
DOI: 10.1016/j.epsl.2019.116007
Abstract: © 2019 The Authors The compositions and volumes of basalt generated by partial melting of the Earth's mantle provide fundamental constraints on the thermo-chemical conditions of the upper mantle. However, using melting products to interpret… read more here.
Keywords: temperature; source; reykjanes peninsula; mantle source ... See more keywords
Subduction-related metasomatic mantle source in the eastern Central Asian Orogenic Belt: Evidence from amphibolites in the Xilingol Complex, Inner Mongolia, China
Sign Up to like & getrecommendations! Published in 2017 at "Gondwana Research"
DOI: 10.1016/j.gr.2015.11.015
Abstract: Abstract The Central Asian Orogenic Belt (CAOB) formed mainly in the Paleozoic due to the closure of the Paleo-Asian oceanic basins and accompanying prolonged accretion of pelagic sediments, oceanic crust, magmatic arcs, and Precambrian terranes.… read more here.
Keywords: source; mantle source; mafic rocks; subduction ... See more keywords
Crustal contamination versus an enriched mantle source for intracontinental mafic rocks: Insights from early Paleozoic mafic rocks of the South China Block
Sign Up to like & getrecommendations! Published in 2017 at "Lithos"
DOI: 10.1016/j.lithos.2017.06.023
Abstract: Abstract Several recent studies have documented that the silicic rocks (SiO 2 > 65 wt.%) comprising Silicic Large Igneous Provinces are derived from partial melting of the crust facilitated by underplating/intraplating of “hidden” large igneous province-scale basaltic… read more here.
Keywords: early paleozoic; enriched mantle; mantle source; mafic ... See more keywords
Phase equilibria and geochemical constraints on the petrogenesis of high-Ti picrite from the Paleogene East Greenland flood basalt province
Sign Up to like & getrecommendations! Published in 2018 at "Lithos"
DOI: 10.1016/j.lithos.2017.11.011
Abstract: Abstract Phase equilibrium experiments have been performed on an extremely high-Ti (5.4 wt.% TiO2) picrite from the base of the Paleogene (~55 Ma) East Greenland Flood Basalt Province. This sample has a high CaO/Al2O3 ratio (1.14), a… read more here.
Keywords: phase; east greenland; source; mantle source ... See more keywords
Neoproterozoic to Cenozoic magmatism in the central part of the Bohemian Massif (Czech Republic): Isotopic tracking of the evolution of the mantle through the Variscan orogeny
Sign Up to like & getrecommendations! Published in 2019 at "Lithos"
DOI: 10.1016/j.lithos.2018.12.028
Abstract: Abstract The evolution of the mantle source beneath the Tepla-Barrandian (TBB) and the adjacent southern part of the Saxo-Thuringian (S-STB) and northern part of the Moldanubian (N-MB) blocks of the Bohemian Massif (Czech Republic) is… read more here.
Keywords: paleozoic; mantle; part; mantle source ... See more keywords
Petrogenesis and mantle source characteristics of volcanic rocks on Jeju Island, South Korea
Sign Up to like & getrecommendations! Published in 2019 at "Lithos"
DOI: 10.1016/j.lithos.2018.12.034
Abstract: Abstract Volcanic rocks on Jeju Island, South Korea, are dominantly alkaline suites (basalt to trachyte) with small amounts of intercalated tholeiitic (TH) basaltic rocks. The alkaline suites can be subdivided into high-Al alkaline (HAA) and… read more here.
Keywords: jeju island; source; mantle source; volcanic rocks ... See more keywords
No evidence for carbon enrichment in the mantle source of carbonatites in eastern Africa
Sign Up to like & getrecommendations! Published in 2020 at "Geology"
DOI: 10.1130/g47629.1
Abstract: Carbonatites are unusual, carbon-rich magmas thought to form either by the melting of a carbon-rich mantle source or by low-degree partial melting of a carbon-poor ( read more here.
Keywords: mantle; evidence carbon; mantle source; carbon ... See more keywords
Petrogenesis and characteristics of the mantle source for the Quaternary Datong basalt: Research on the major, trace elements and Sr-Nd-Pb-Hf isotopes
Sign Up to like & getrecommendations! Published in 2020 at "Acta Petrologica Sinica"
DOI: 10.18654/1000-0569/2020.11.05
Abstract: 大同火山区位于大兴安岭-太行山重力梯度带西侧，所发育的第四纪玄武岩岩石地球化学特征为探索该区火山岩成因提供了重要约束，同时也为华北克拉通西部岩石圈地幔与软流圈的相互作用提供重要依据。根据火山地貌和岩性的不同，沿着北东向陈庄-许堡断裂可将大同玄武岩大致分为东、西两区，西区火山多呈锥状，以碱性玄武岩为主；东区则以溢流拉斑玄武岩为主，锥体少。镜下岩相学研究观察到大量橄榄石和单斜辉石斑晶，结合Ni、Cr两种元素随着MgO含量降低而减小，这两种矿物应是分离结晶作用下的主要产物。这些玄武岩的SiO2和（K2O+Na2O）含量分别为45.02%~53.3%和3.60%~6.53%，相对富集轻稀土元素（（La/Yb）N=5.8~31.6），并显示富集LILE（Rb、Ba、Sr正异常）以及HFSE（Nb、Ta、Zr正异常）的洋岛玄武岩（OIB）特征。根据La/Yb-Sm/Yb图解模拟计算得出大同玄武岩均是石榴石相二辉橄榄岩低程度部分熔融的结果，其中碱性玄武岩部分熔融程度约为1.5%~3%，拉斑玄武岩约为4%~8%。所研究的玄武岩有较低87Sr/86Sr（0.703302~0.705102）、较高143Nd/144Nd（0.512561~0.512963）和176Hf/177Hf（0.282922~0.283072）比值。在143Nd/144Nd-87Sr/86Sr图解上大同玄武岩落在OIB范围内；207Pb/204Pb-206Pb/204Pb和143Nd/144Nd-206Pb/204Pb图解表明它们来自PREMA和EMⅠ端元的二元混合。大同碱性玄武岩和拉斑玄武岩的地球化学特征不同可以用两点原因来解释：（1）主量与微量元素特征的差异是两种玄武岩部分熔融程度不一样形成的；（2）同位素特征表明两种玄武岩都来自软流圈亏损端元的部分熔融并存在少量岩石圈富集端元物质的加入，其差异则是加入比例不同造成的。 read more here.
Keywords: characteristics mantle; mantle source; petrogenesis characteristics; quaternary datong ... See more keywords