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1997: GENETIC ENVIRONMENT OF ORDOVICIAN RADIOLARIAN CHERTS AND VOLCANIC TUFFS IN WEIBEI, SHAANXI PROVINCE. Geological Bulletin of China, 16(4). DOI: 10.12097/gbc.ZQYD704.011
Citation: 1997: GENETIC ENVIRONMENT OF ORDOVICIAN RADIOLARIAN CHERTS AND VOLCANIC TUFFS IN WEIBEI, SHAANXI PROVINCE. Geological Bulletin of China, 16(4). DOI: 10.12097/gbc.ZQYD704.011
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GENETIC ENVIRONMENT OF ORDOVICIAN RADIOLARIAN CHERTS AND VOLCANIC TUFFS IN WEIBEI, SHAANXI PROVINCE

  • Department of Geology, Northwest University, Xi’an, Shaanxi

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  • Available Online: August 17, 2023
  • Published Date: November 14, 1997
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  • Petrological characteristics of bedded radiolarian cherts and different types of volcanic tuffs have been studied in the Ordovician of Weibei, Shaanxi. Distal eruptive materials supplied SiO 2. Radiolarians thrived largely in this condition, and gradually dead bodies of radiolarians were accumulated on sea bottom and turned finally into bedded radiolarian cherts with sediments. It is inferred further that the Middle Upper Ordovician were deposited in a pelagic or semipelagic deep water environment with a greatly rising sea level. Volcanic tuff is the product of island arc volcanic eruption. This area was once the north margin of a back arc basin which belonged to an active continental margin of the North China plate.
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