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Geology; August 2002; v. 30; no. 8; p. 699-702; DOI: 10.1130/0091-7613(2002)030<0699:POPVTI>2.0.CO;2
© 2002 Geological Society of America
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Preservation of primary volcanic textures in the ultrahigh-pressure terrain of Dabie Shan

R. Oberhänsli1, G. Martinotti2, R. Schmid3 and X. Liu4

1 Institute of Geosciences, Potsdam University, PB 601553, 14415 Potsdam, Germany
2 Geologia, Dipartimento di Scienze della Terra, Università di Torino, 10125 Torino, Italy
3 Institute of Geosciences, Potsdam University, PB 601553, 14415 Potsdam, Germany
4 Chinese Academy of Geological Science, 26 Beiwanzhuang Road, Beijing 100037, Peoples Republic of China

Delicate primary volcanic features such as ash layers, volcaniclastic breccias, and pillow lavas with amygdaloidal rims have been identified in a terrigenous volcanosedimentary sequence forming part of the ultrahigh-pressure unit of the Dabie Shan, China. The presence of coesite relics in crosscutting dikes confirms an ultrahigh-pressure evolution for the entire sequence. Evaluation of the probable reaction history for zeolite compositions as supposed for the amygdaloidal rims reveals a scarcity of reactions at very high pressures. Such special conditions of low reactivity and fluid-conserving reactions, combined with a lack of directed stress, have allowed the remarkable preservation of these primary volcanic features despite deep subduction.

Key Words: ultrahigh-pressure metamorphism • pillow structures • Dabie Shan • volcaniclastic rocks




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