The discovery of eclogite dikes in low-greenschist facies volcaniclastic rocks of the Dabie Mountains

October 1997, Volume 42, Issue 20, pp 1726–1729 | Cite as

Bulletin

Received: 08 April 1997

Conclusions

1.

The eclogite dikes in low-greenschist facies epi-metamorphic volcaniclastic rocks in the Dabie Mountains areas show magma origin rather than tectonic melange or metamorphic origin.
2.

Coesite and quartz pseudomorphs in the eclogite show that they were formed at the pressure of over 2.8 GPa and belong to ultrahigh pressure type. Therefore, there were high-pressure eclogite magma at deep crust depth.
3.

From the country rock age of the low-grade metamorphic volcaniclastic rocks, we infer that the eclogite dikes were formed after the Sinian.

eclogite dike magmatic origin low-greenschist facies volcaniclastic rocks Dabie Monntains areas

This is a preview of subscription content, to check access.

Unable to display preview. Download preview PDF.

1.
Tang Jiafu, Qian Cunchao, Gao Tianshan, The discovery of epirnetarnorphic volcaniclastic rock bed association in the eclogite belt and its geologic implication, the Dabie Mts.,Geology of Anhui (in Chinese), 1995, 5(2): 29.Google Scholar
2.
Dong Shuwen, Wang Xiaofeng, Huang Dezhi, The discovery of epimetamorphic crag association in high-pressure metamorphic belt and its geologic implication, the Dabie Mt.,Chinese Science Bulletin (in Chinese), 1996, 41(9): 815.Google Scholar
3.
Cong Bolin, Zhang Wenhua, Garnet in eclogite,Chinese Science Bulletin, 1977, (5): 413.Google Scholar
4.
Condie, K. C., Trace-element geochemistry of Archean greenstone belts,Earth Sci. Rev., 1976, 12:392.CrossRefGoogle Scholar
5.
Cullers, R. L., Graf, J. L., Rare earth elements in igneous rocks of the continent: Predominantly basic and ultrabasic rocks in earth element, inGeochemistry, Amsterdam: Elsevier, 1984, 237.Google Scholar
6.
Ellis, D. J., Green, D. H., An experimental study of the effect of Ca upon garnet-clinopyroxene Fe-Mg exchange equilibria,Contributions to Mineralogy and Petrology, 1979, 71:13.CrossRefGoogle Scholar