Phyllosilicates, detrital

Siderite exhibits the lowest Sr/ Sr ratio (0.71151) of all carbonates from the structural blocks (Table 3), still significantly higher than that of Jurassic seawater (Fig. 8B). Because siderite is often precipitated in association with detrital micas and clays, it may have incorporated some of the highly radiogenic Sr from the old detrital phyllosil-... 

Smectites Most clay minerals in deep-sea sediments are detrital phases from continental weathering. These minerals compose the bulk of the nonbiogenic sediments in the <2 pm fraction and include clay-sized quartz and the phyllosilicates kaolinite, illite, chlorite, and smectite. The smectite... 

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