high temperature plagioclase
1.The main characters of the thermal fluid activity are recognized as follow: many types and stages of veins are widely developed; vitrinite reflectivity of different areas varies apparently with the depth; there was a high temperature field during the formation of the thermal fluid, meanwhile, the volcaniclastic rocks were modificated by the thermal fluid activity, for example, sericitization of plagioclase, chloritization of volcanic detritus in andesitic detris tuff; in the tufaceous mud, the thermal fluid activity accelerates "maturating" of the organic carbon by heating; and the trace elements show an anomaly in the wall rocks.
