Ultramafic xenoliths in mesozoic diorite in west shandong province |
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| Authors: | Email author" target="_blank">Lihui?ChenEmail author Xinhua?Zhou |
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| Institution: | 1. The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, China and School of Earth and Space Sciences, Peking University, Beijing 100871, China;Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, Chi
2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Ultramafic xenoliths are common in Tietonggou intrusion, Laiwu, Shandong Province. Peridotite xenoliths develop two-stage metasomatism popularly: (i) The early metasomatism is characterized by intergranular clinopyroxene and phlogopite; (ii) The later metasomatism is characterized by orthopyroxene veins with a few plagioclases and amphiboles. These ultramafic xenoliths are thought to be mostly from the crust-mantle transitional zone on the basis of their combination, mineral chemistry, equilibrium temperature, and metasomatic characteristics. Major elements, rare earth elements, and Sr-Nd isotopic composition of the ultramafic xenoliths indicate that there is a petrogenetic relationship between the silica-enriched xenoliths and their host diorites. We propose that such silica enrichment might be an indicator of melt-rock interactions in the Mesozoic lithosphere beneath western Shandong. |
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| Keywords: | ultramafic xenoliths crust-mantle transitional zone metasomatism Tietonggou intrusion Laiwu |
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