The possible contribution of a mantle-derived fluid to the Ningwu porphyry iron deposits-Evidence from carbon and strontium isotopes of apatites |
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Authors: | Jinjie Yu Jingwen Mao Changqing Zhang |
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Institution: | Institute of Mineral Resources, Chinese Academy of Geological Science, Beijing 100037, China |
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Abstract: | Apatite is a characteristic mineral for the iron deposits in the Ningwu region. Apatite shows a range of δ13CPDB values from -9.6‰ to-0.6‰, and most of them with the δ13CPDB values distributed in a range of mantle carbon (I.e., -2%0 to -9%0), except for samples T-06-1and J-06-3. Apatites in the Ningwu porphyry iron deposits yield a narrow variation range of 87Sr/86Sr values from 0.706326 to 0.707577,similar to those of the volcanic and subvolcanic rocks and higher than that of a typical mantle-derived magmatic apatite (I.e., about0.7040), indicating that formation of the apatites was involved with crust material contamination. δ13CPDB and 87Sr/86Sr values of the apatite indicate a possible contribution of mantle-derived fluid and material to formation of the Ningwu porphyry iron deposits,supported by regional geology, regional gravities and geochemistry of the volcanic and subvolcanic rocks in the Ningwu region. |
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Keywords: | Apatite 87Sr/86Sr ratios Fluid inclusion Mantle fluid and material |
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