New Frontiers in Rare Earth Science and Applications by Xu Guangxian

By Xu Guangxian

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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.

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