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| Keywords | |
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crustal contamination |
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magmatic source |
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mafic-ultramafic intrusions |
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Beishan area |
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Gansu |
| Authors | |
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ZHANG Jiang-Jiang |
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JIAN Zhuang-Zhi |
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SUN Tao |
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JIANG Chao |
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WANG Ruo-Mei |
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YANG Su-Hong |
| PubMed | |
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Article by Zhang, J. J. |
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Article by Jian, Z. Z. |
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Article by Sun, T. |
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Article by Jiang, C. |
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Article by Wang, R. M. |
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Article by Yang, S. H. |
Petrogenesis of Luotuoshan mafic-ultramafic intrusions in Beishan area��Gansu
ZHANG Jiang-Jiang, JIAN Zhuang-Zhi, SUN Tao, JIANG Chao, WANG Ruo-Mei, YANG Su-Hong
1. College of Earth Science and ��esources��Chang'an University��Xi'an 710054��China; 2. Key Laboratory of Western China's Mineral ��esources and Geological Engineering��Ministry of Education��Xi'an 710054��China; 3. M��L Key Laboratory of Metallogeny and Mineral Assessment��Institute of Mineral ��esources��Chinese Academy of Geological Sciences��Beijing 100037��China
The major rock types of Luotuoshan mafic-ultramafic intrusions are clinopyroxene troctolite��olive gabbro norite��troctolite��gabbro-norite and gabbro�� The value of olivine Fo is 76 ��83��indicating the peridot in li- thology�� The chemical characteristics of pyroxene and major elements indicate that the intrutions belong to the tho- leiitic series�� The distribution curve of ��EE shows enrichment of L��EE and slight variation of H��EE�� Trace ele- ments are enriched in LILE (e. g. ��b��Ba and Sr) and loss of HFSE (e. g. Ta��Hf and Th)�� The fractional crys- tallization in magmatic evolution is mainly controlled by clinopyroxene�� The values of Nb/U and Ce/Pb are close to the Earth's crust and sensitive element ratio covariance relationship�� It indicates that assimilation took place during magmatic evolution�� The plots of Th/Yb versus Nb/Yb and La/Ba versus La/Nb imply that magmatic source may be the enriched lithosphere mantle modified by subduction fluid��