Tectonic settings, geologic structure and volcanic rocks

Tectonic settings, geologic structure and volcanic rocks 

Chemical analytical data are summarized in Table 2.13 and Table 2.14. The back-arc deposits are characterized by higher Pb, Ba Ag, Au, As and Sb contents than midoceanic ridge deposits. This difference is due to different mineralogy which is described below. 

kaolins (kaolinite and halloysite), Mg-rich chlorite, talc, montmorillonite and chlorite/montmorillonite are abundant in the host epiclastic sediments and pumiceous tuffs at Jade in the Okinawa Trough (Marumo and Hattori, 1997). 

Chemical compositions of end member hydrothermal solution venting from back-arc basins and midoceanic ridges are summarized in Table 2.14 and Table 2.15 (Ishibashi and Urabe, 1995 Gamo, 1995). 

Average content (in parts per million or percent) of selected metals and SIOt in 37 hydrothermal sulfide samples from the Sunrise deposit (lizasa et ah, 1999) 

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