Dissolved Al in sediments and waters of the East China Sea : implications for authigenic mineral formation

摘要: Abstract Numerous previous studies indicate that several different authigenic aluminosilicates form in the oceans. In this study we show, using dissolved Al distributions sediments and waters from nearshore regions of East China Sea, process aluminosilicate formation probably begins rapidly upon contact detrital clays with seawater. Statistical analyses Al-Si-H + relations surface minerals forming Sea low Fe are dioctahedral chlorites an average composition EX 0.91 Mg 0.77 5.0 Si 2.7 O 10 (OH) 8 (where = exchangeable 1 cation). This is also consistent measurements as a function salinity turbid overlying waters. Results suggest dissolution—reprecipitation mechanism for clay mineral reconstitution. can help to explain why found areas total amount present must constitute very minor fraction bottom sediments. Thus, these has relatively small impact distributions. Clay reconstitution may provide buffering respect pH, formed should be direct H activity surrounding environment.