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《Geological Journal of China Universities》 2005-03
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Volcanic Ash in the Clay Rocks from Upper Shaximiao Formation of Middle Jurassic, Northeast of Sichuan Basin: Evidence from Petrology, Mineralogy and Geochemistry

ZHANG Chao~1, MA Chang-qian~2, SHE Zhen-bing~1, YIN Kun-long~3(1.Graduate School, China University of Geosciences, Wuhan 430074, China;2.Faulty of Earth Sciences, China University of Geosciences, Wuhan 430074, China;3.Faulty of Engineering, China University of Geosciences, Wuhan 430074, China)  
The gray montmorillonite-rich beds (clay rocks), discovered in the Upper Shaximiao formation of Middle Jurassic, Wanzhou City, were studied mineralogically and chemically. The clay minerals in the clay rocks are typically montmorillonite, illite and chlorite. Based on the comparison with post-Archean Australian shale (PAAS), north American average shale (NASC), background value of earth crust clay and other typical rocks, the studied clay rocks are characterized by low abundances of V, Ti, and Fe group elements, and high Al_2O_3/TiO_2 and Ti/Th ratios. Some beds have clear negative Eu anomalies. The sources of clay rocks are interpreted as mixtures of volcanic ash and continental debris. The variation of compositions in different beds shows different mixing ratios at different times when the Sichuan basin was formed. It is suggested that the volcanic ash might come from the middle Jurassic volcanic arc in the Tethys which was about 600 km to the west.
【Fund】: 国家地质学理科基地基金资助
【CateGory Index】: P588.22;P594
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