马里亚纳海槽海底热液硫化物的同位素地球化学特征

Based on δ^18O,δD,δ^30Si and δ^34S values stable isotope determinations and previous studies, the hydrothermal chimneys in the Mariana Trough is the silicic chimney consisting dominantly of amorphous SiO2(opal) whose oxygen isotope temperature is generally lower than 200℃,reflectingintermediate-low temperature type. Volcanic hydrothermal sulfides with the metallic mineral has a intermediate-higher oxygen isotope temperature(peak value 275℃) in the Mariana Arc. hydrothermal sulfides in the Mariana Trough is closely related to the oceanic environment and not affected by atmospheric precipitation.