| Citation: |
BAI Yun-shan, NIU Zhi-jun, DUAN Qi-fa, ZHAO Xiao-ming, TANG Chao-yang. Geochemical characteristics and its tectonic significance of Upper Triassic Batang group volcano rocks in Zhahe area, Zhiduo County, Southern Qinghai Province[J]. South China Geology, 2014, (4): 319-327. doi: 10.3969/j.issn.1007-3701.2014.04.003
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Geochemical characteristics and its tectonic significance of Upper Triassic Batang group volcano rocks in Zhahe area, Zhiduo County, Southern Qinghai Province
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Abstract
Batang group volcano rock is mainly composed of basalt-andesite rhyolite, formed from a set of basic to neutral to acidic rock combination, with the sequence evolution is more complete. Petrochemistry showed low TiO2 (less than 1 wt%), high Al; the characteristics of rare earth elements showed enrichment of light rare earth ele-ments; in the trace element geochemistry, the performance for the enrichment of large ion lithophile elements, de-pleted in high field strength elements, εNd (t) is -0.3 ~ 2.9, εSr (t) is 14.4 ~ 39.2, all the above geochemical characteristics indicate those rocks were formed in volcano arc environment, is product of the Lazhulong- Jinsha River ocean (or Ganzi-Litang ocean) southward subduction.-
Keywords:
- The Triassic Batang group /
- volcano rock /
- tectonic environment /
- Zhahe area /
- Eastern Qiangtang /
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BAI Yun-shan, NIU Zhi-jun, DUAN Qi-fa, ZHAO Xiao-ming, TANG Chao-yang. Geochemical characteristics and its tectonic significance of Upper Triassic Batang group volcano rocks in Zhahe area, Zhiduo County, Southern Qinghai Province[J]. South China Geology, 2014, (4): 319-327. doi: 10.3969/j.issn.1007-3701.2014.04.003
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