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- W2371369957 abstract "By regional detailed survey, we discovered association, distribution and types of volcanic apparatus, and finded outcropping mantle rocks in that area. The volcanic activity of first member of Yixian Formation in this area can be divided into four volcanic eruption subcycles. Subcycle Ⅰ: The lower part of layer is a thick-bedded tuffaceous polymictic microconglomerate . The upper part is glomeroporphyric dorgalite and vesicular amygdaloidal basalt. Subcycle Ⅱ: The lower part of layer contains tuffaceous greywacke , sedimentary tuff, tuff and basaltic andesitic agglomerate. The upper part is amygdaloidal dorgalite, interbedded with latibasalt, and intercalate pyroxene basaltic andesite. Subcycle Ⅲ: Crystal-lithic tuff, lithic basaltic andesitic greywacke, welded agglomerate, amygdaloidal olivine melilite basanite, tholeiite, amygdaloidal basaltic andesite and amygdaloidal, which contain interbed of dorgalite. Subcycle Ⅳ: The volcanic erupted a great deal of dorgalite, amygdaloidal basaltic andesite and basalt on tuffaceous lithic feldspathic greywacke. A great deal of volcanic apparatus occurred in Sihetuen-Houyanzigou volcanic area in association style. About five craters distributed in center of volcanic field. They are in a center volcanic cluster , around which these are five small volcanic cluster in near annular. Every small volcanic cluster made up a small volcanic apparatus. Similarly, small volcanic apparatus also have center volcanic crater rounded by a number of small volcanic craters. We name it as assemblage type volcanic apparatus. Combination basanite and dorgalite was discoved in center district of the assemblage type volcanic apparatus. According to geochemical research , magma occurred at depth up to 118 kilometers, we recognize that magma material derived from upper mantle." @default.
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- W2371369957 date "2009-01-01" @default.
- W2371369957 modified "2023-09-26" @default.
- W2371369957 title "Evolusion of Sihetuen-Houyanzigou Early Cretaceous volcanic cluster apparatus and volcanic effusive activity in western Liaoning" @default.
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