Ladinian radiolarian fauna,siliceous rock from the Xianshuihe Belt,West Sichuan and their tectonic significance |
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| Authors: | Email author" target="_blank">Bin?LlangEmail author Qinglail?Feng Quanwei?Wang Jianqiu?Guo Changhong?Zohong Zhenjiang?Li |
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| Institution: | 1. Faculty of Earth Science, China University of Geosciences, Wuhan 430074, Chinaa
2. Sichuan Geological Survey, Chengdu 610000, China |
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| Abstract: | Ladinian radiolarian fauna, including Muelleritortis, Baumgartneria, Oertlispongus, Paroertlispongus, Pseudoertlispongus, etc., was discovered from the siliceous rock of the Runiange Formation in the Xianshuihe belt, West Sichuan Province. Geochemical
test on five samples from the siliceous rock indicates that Si02 content varies in 71.1 6%-90.06% and Si/AI ratio, in 49-71,
which shows that the siliceous rock contains more terrigenous mud sediments. The siliceous rock is characterized by the large
ratios of AI2O3/(Al2O3+Fe2O3(0) 63-0.81) and TiIV (>26), the low ratio of V/Y (<2.8), and low vanadium content (~ 2 p3g lg),
which are similar to the geochemical characteristics of continental margin siliceous rock. The Ce/Ce* ratios of the four samples
vary in 1.02-1.47 and the LaN/CeN ratio, in 0.75-1.07, which imply that the siliceous rock was deposited in the continental
margin basin. But only one sample is similar to the oceanic siliceous rock in REE. Turbidite-siliceous rock bearing radiolarian-basalt
assemblage and the geochemical characteristics of the siliceous rock indicate that the Xianshuihe belt is in the strong rift
stage in the Ladinian age. |
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| Keywords: | siliceous rock radiolarians Triassic the Xianshuihe belt West Sichuan |
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