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8215207 
Journal Article 
Strontium, manganese and iron contents, and oxygen isotopes in the carbonate fractions recovered from hole 398C, ( DSDP) Leg 47B 
Renard, M; Richebois, G; Letolle, R 
1979 
497-506 
English 
Mineralogically, the composition of the carbonate fraction always corresponded to low Mg calcite. Exceptions were found in Aptian-Albian beds which contained no Ca carbonates in spite of a high weight loss when dissolved in acetic acid. For these samples, X-ray analysis showed the presence of quartz, opal, amorphous matter, and rhodocrosite. -from Authors