By Xu Guangxian
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Additional resources for New Frontiers in Rare Earth Science and Applications
3. , 1967, Determination of rare-earth elements in rocks and minerals by a mass spectrometric stable isotope dilu tion technique: Analytical Chemistry, v. 39, No. 14, p. 1888-1890. , 1979, Massspectrometric stable-isotope-dilution analysis for lanthanides in geochemical materials, Handbook on the Physics and Chemistry of Rare Earths (eds. A. , and L. Eyring) North-Holland Publishing Company, v. 4, chap. 37G, p. 471-481. , 1970, Partition coefficients of rare-earth elements between igneous matrix material and rock-forming mineral phenocrysts-II: Geochimica et Cosmochimica Acta, v.
IV. MELANOCRATIC DYKES GROUPS Of all the groups, this is the most complex one in composition. , Though very different in REE content, all of them have LRE selected distribution patterns without exception. They must be fo rmed from different parent magmas and at different depths. , 1974) and other characteristics, melilitites have the deepest origin and are related to alkaline olivine ba salt magma, while others are chiefly derived from tholeiite magma. 60 RARE EARTH ELEMENT DIFFERENTIATION TRENDS IN RHYOLITES FROM THE WESTERN UNITED STATES AND MEXICO K e n n e t h L.
2. the element association is rich in LREE, Nb, Mn, 87 86 34 F, Sr, Ba and P, 3. 63%°; 4. the rare-earth patterns relative to chondrites for ore-bearing formation steeply decline to right without Eu anomaly. The ore bodies, which look like a volcanic cone or great lens, are parallel to host rockbodies and always associate with potassium-rich alkaline volcanic rocks. The geological and geochemical characteristics indicate that such ore should be formed during the sedimentation of ore-bearing carbonatitic magma in sea channel.