Table 3. Analyses of irregular carbonate edifice obtained from 

 Aloha trawl. 



Sample 

 Description 



Principal 

 mineralogy 



AO 18 

 (°/OQ PDB) 



AC 13 

 (°/oo PDB) 



1. Weathered surface, chalky 

 cemented glauconite sand 



a. Groundmass dominating 



b. Cement dominating 



2. Weathered surface, gray 

 oxic-reducing boundary 



a. Groundmass, soft, whitish 



b. Groundmass, fresh interior, 

 hard, black 



c. Gravelly groundmass with 

 white cement 



Aragonite +4 .20 



Aragonite +4.37 



Aragonite, Mg-Calcite +4.42 

 Aragonite, Mg-Calcite +4.49 



Aragonite +4.32 



-49.91 

 -50.63 



-51.59 

 -51.24 



-48.27 



3. Cemented tube segment 



a. Fresh tube wall, black 

 cemented sandy groundmass 



b. Interior cement, gray 



c. Interior cement, white 



4. Groundmass, black with 

 "laminated" exterior cement 



a. Fresh interior groundmass, black 



b. Exterior cement, white 



5. Fresh groundmass, black with 



yellowish fibrous cement 

 a. Fresh groundmass, black 

 b. Exterior cement 



Aragonite, Mg-Calcite +4.56 



Mg-Calcite +4.84 



Aragonite +4.30 



Aragonite, Mg-Calcite 

 Aragonite +4.19 



Aragonite, Mg-Calcite +4.42- 

 Aragonite +3.95 



-51.54 



-52.23 

 -51.75 



-51.96 



-51.80 

 -53.31 



170 



