Ultramafic xenoliths in mesozoic diorite in west shandong province

被引：2

作者：

Lihui Chen

Xinhua Zhou

机构：

[1] China and School of Earth and Space Science Peking University,The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education

[2] Chinese Academy of Sciences,Institute of Geology and Geophysics

来源：

Science in China Series D: Earth Sciences | 2004年 / 47卷

关键词：

ultramafic xenoliths; crust-mantle transitional zone; metasomatism; Tietonggou intrusion; Laiwu;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

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.

引用

页码：489 / 499

页数：10

共 59 条

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