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《Journal of Jiling University (Earth Science Edition)》 1983-01
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Omega-type structure

Jiang Keyi et al  
Through the investigation of the regional structures and the structures of ore deposits and ore fields in some Pre-cambrian metamorphic areas in China, the authors find out that there generally exists one type of superposed fold pattern, the omega (Greek Ω) type structure, in the Pre-cambrian metamorphic formations. The Ω-type structure is a structural pattern that strike folds are superposed by dip folds, and they are always in company with plastic faults. The plastic faults are not the common faults or ductile faults, and the dip folds are not plunging folds, either.The structures of Ω -type, therefore, are neither refolded folds nor cross folds. They may be small or large in extent and various in form. The Anshan Group and the Liaohe Group in the east of Liaoning contain a series of Ω-type structures respectively. In the areas of Mount Zhongtiao of Shanxi, the middle of Sichuan and the east of Yunnan, and Mount Lang of Inner Mongolia there are many good examples of such structures in the Pre-cambrian metamorphic formations.TheΩ -type structure probably becomes the characteristic structural pattern of Pre-cambrian metamorphic formations.Up to the present, dip folds have been generally regarded as plunging folds and thus these kind of structures as refolded folds or cross folds or gneiss domes. The basic reason for such confusions is that the b-axis in the stress field for any type of folding, including dip folding, has been taken for granted that it is horizontal . Actually it is mainly in high angle and even vertical in stress field for dip folding.
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【Citations】
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【Co-citations】
Chinese Journal Full-text Database 10 Hits
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China Proceedings of conference Full-text Database 7 Hits
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2 Zhai Anmin Li Zenghui Wang Yulin Zhang Dianfa (Tianjing Institute of Geology and Mineral Resources,Chinese Academy of Geological Sciences);THE CHARACTERISTICS OF STRUCTURAL EVOLUTION OF THE METAMORPHIC ROCK SERIES OF WENDUERMIAO GROUP OF THE BAORIHAN REGION,NEIMONGGOL[A];[C];1982
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5 Wang Jianping Yang Yudong;THRUST AND NAPPE STRUCTURES IN THE DAQINGSHAN AREA,NEI MONGGOL[A];[C];1983
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