Minor elements in igneous and metamorphic apatite |
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| Affiliation: | 1. CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;3. Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;4. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Science, Beijing 100101, China;5. University of Chinese Academy of Sciences, Beijing 100094, China;6. SOA Key Laboratory of Submarine Geociences Second Institute of Oceanography State Ocean Administration, Hangzhou 310012, China;1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;2. College of Earth Science and Key Laboratory of Tectonic Controlled Mineralization and Oil Reservoir, Chengdu University of Technology, Chengdu 610059, China;3. China University of Geosciences Beijing, Beijing 100083, China;1. School of Physical Sciences, University of Adelaide, Adelaide, SA 5000, Australia;2. School of Chemical Engineering, University of Adelaide, Adelaide, SA 5000, Australia;3. BHP Billiton, Olympic Dam, Adelaide, SA 5000, Australia |
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| Abstract: | Analyses of forty-six apatites from various igneous and metamorphic environments have shown enrichment relative to the lithosphere in Ce, Y, La and Sr; apatite from many granite pegmatites is also enriched in Mn. These elements appear to be substituting for Ca in the structure.The P position is far less amenable to impurity incorporation and As5+ and V5+ seldom substitute to any degree for P5+; this is partly due to environmental and partly to structural control.The ratio of Y to Ce + La is higher and total Ce + La + Y content lower, in pegmatite apatites than in apatite from regional metamorphic and plutonic environments, because of selective incorporation of the Ce-earths in K-felspars and monazite during crystallization of granites and pegmatites and enrichment of the Y-earths in residual solutions.The highest Sr content occurs in apatite from ultrabasic and alkalic rocks. Ba is also enriched in apatite from alkalic complexes and carbonatites. |
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