西藏札达县夏浦沟的放射虫硅质岩和岛弧火山岩: 新特提斯洋内俯冲体系的记录?

许荣科; 郑有业; 冯庆来; 陕亮; 魏俊浩; 张翔; 张刚阳; 马国桃; 庞迎春

Volume 34 Issue 6

Jun. 2009

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Article Navigation > Earth Science > 2009 > 34(6): 884-894

XU Rong-ke, ZHENG You-ye, FENG Qing-lai, SHAN Liang, WEI Jun-hao, ZHANG Xiang, ZHANG Gang-yang, MA Guo-tao, PANG Ying-chun, 2009. Radiolarian Chert and Island-Arc Volcanic Rocks in Xiapugou Tibet: Records of Neo-Tethys Intra-Oceanic Subduction System?. Earth Science, 34(6): 884-894.

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Radiolarian Chert and Island-Arc Volcanic Rocks in Xiapugou Tibet: Records of Neo-Tethys Intra-Oceanic Subduction System?

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
3.
Development and Research Center of China Geological Survey, Beijing 100037, China
4.
Second Geological and Mineral Exploration Institute of Gansu Province, Lanzhou 730045, China
5.
Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, China

Received Date: 2009-06-16
Publish Date: 2009-11-25

Abstract

Abstract

The stratigraphic units composed of radiolarian chert and lava were found in Xiapugou in western of Yarlung Zangbo Suture Zone during the 1/250000 field geology survey. The radiolarian cherts are characterized by SiO₂ ranging from 89.47 to 92.94%, Si/ Al ratio ranging from 43 to 67, Al/ (Al+Fe+Mn) ratio from 0.68 to 0.74, The average MnO/TiO₂, Ce/Ce^* and LaN/CeN ratio is 0.60, 0.89 and 1.09, which indicates the radiolarian chert was formed in transitional environment between continental margin basin and the oceanic basin, and had much more close relationship with the former one. The lava mainly belongs to andesite and is characterized by (1) low TiO₂ varying from 0.75 to 0.98%; (2) gentle enrichment in LREE; (3) fluid-soluble elements, such as Ba, U and Pb, are extremely enriched compared with LREE; (4) depleted in high-field strength elements (HFSE) such as Nb, Ta, Ti). All these characters imply that the stratigraphic units are consistent with a juvenile intra-oceanic arc, which maybe represents the remains of New-Tethys intra-oceanic subduction system. The early Cretaceous fauna of radiolarian fossils from the chert including Alievium cf. regulare, Alievium cf. fatuum, Archaeospongoprunum cf. patricki, Archaeodictyimitra mitra Dumitrica et al. have been identified, yielding a upper time restrain of this juvenile intra-oceanic arc.
- Cretaceous,
- radiolarian,
- chert,
- lithology,
- island arc,
- Xiapugou,
- Yarlung Zangbo Suture Zone

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References(84)

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Radiolarian Chert and Island-Arc Volcanic Rocks in Xiapugou Tibet: Records of Neo-Tethys Intra-Oceanic Subduction System?

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