1034 D. Submarine Geology and Geophysics OLR (1985) 32 (12)

D 3 4 0 . M a n g a n e s e nodules , etc .

85:7185 Cunningham, Robert and W.C. Burnett, 1985.

Amino acid bl01geo~mm~xy and datiag of off- shore Peru~Chile ~ e s . Geochim. cos- mochim. Acta, 49(6):1413-1419.

Amino acid biogeochemical results confirm the youthful nature of these deposits. Amino acid compositional patterns are uniform for all nodules and are similar to unlithified surface sediments from the region suggesting that the nodules and sediments constitute a single genetic series. Exxon Prod. Res. Co., Houston. TX 77001. USA.

85:7186 de Moustier, Christian, 1985. Inference of manganese

nodule coverage from Sea Beam acomtic back- scattering data. Geophysics, 50(6):989-1001.

Patchiness of nodule coverage is evidenced by definite highs and lows in the reflectivity pattern. Agreement between the simple nodule coverage predictions from Sea Beam acoustic data and the bottom photographs taken throughout the area is 98 percent. Although the Sea Beam system is limited in its dynamic range, it can be used very effectively to determine both topography and nodule coverage in potential mining areas. Mar. Phys. Lab., Scripps Inst. of Oceanogr., La Jolla, CA 92093. USA.

85:7187 Han. S.-J. and B.-C. Suk, 1984. Geological chare, c-

mra t~ of t ~ ~ ~ ~ md ~ awodated sdalmm in the Nocal ~almwlal Paei|ic. Bull. Korea Ocean Res. Dev. Inst., 6(1-2):21-29. (In Korean, English abstract.)

Survey data on sediment characteristics, subbottom structure, and the mineralogy and geochemistry of manganese nodules showed a southeastward in- crease in sediment thickness, a surface sediment composed primarily of biogenic brown siliceous ooze, and three nodule types (B, Kg and Kr). Todorokite was the principal mineral, but birnessite and o-MnO 2 phases were also present. Geol. Oceanogr. Lab., KORDI, Seoul, Korea. (llt)

85:7188 Mita, Naoki and Seizo Nakao, 1984. Xlll,

~ c ~ n ~ J t l ~ of dmc-am ~ Inca the G H ~ 5 area in ane emma Panic l~ala lwith respect to m a n p m ~ I¢lelesl. Geol. Surv. Japan Cruise Rept, 20:215-226.

The moisture content and minor elements (Mn, Fe, Co, Ni, Cu, Zn and Pb) in sediment samples were determined to elucidate the origin of manganese

nodules. A total of 109 sediment samples consisting of 22 surface sediment and 87 core segment samples were examined. The general distribution of metal contents and correlations among the elements are described. Geol. Surv. of Japan, Ibaraki-ken, Japan.

85:7189 Sugisaki, Ryuichi and Koshi Yamamoto, 1984. XIl.

Major element chemistry of Pacific marine sediments Iwith respect to ~ nodalesl around 10°N and 1700W: ~ from G ~ 5 crnlse, Geological Survey of Japan. Geol. Surv. Japan Cruise Rept, 20:198-214.

Major element chemistry of 106 marine sediments from the central Pacific Basin (8°40"-10°N, 173°50"-175°W) was compared to that of sediments sampled on a Wake to Tahiti cruise and on a north central Pacific Basin cruise. Sediments were enriched in Na20 and P20~ and impoverished in Sit2; results suggest that Sit2 biological activity is low in this area. Also discussed are the relationship between A1203, T i t 2 and MgO and the enrichment of Na20 in zeolitic clay. Dept. of Earth Sci., Nagoya Univ., Chikusa, Nagoya, Japan. (msg)

85:7190 Suk, B.-C. and S.-J. Han, 1984. Exploration and

nodule. Bull. Korea Ocean Res. Dev. Inst., 6(1-2):75-85. (In Korean, English abstract.)

Nodule mining technology is described, including direct exploration methods (grab, dredge and corer sampling, underwater photography), and indirect methods (seismic, magnetic, gravity and sidescan surveys). Techniques used in mining and processing and data acquisition, all important for exploitation, are also discussed. Geol. Oceanogr. Lab., KORDI, Seoul, Korea. (llt)

85:7191 Thijssen, T., G.P. Glasby, G. Friedrich, P. Stoffers

and A. Sioulas, 1985. M ~ nodules in the central Peru ~ . Chemie Erde, 44(1):1,46.

An extensive study of Peru Basin manganese nodules (424 stations over 165,700 km 2) was ~der - taken in 1979 following the discovery of Mn of potential economic importance. Nodule distribution, morphology, mineralogy, geochemistry, internal structure, and distribution with ~ e n t depth were studied. Input from both biogenic and diagenetic processes appears to be respons~le for the unusual characteristics of growth, size, morphology, Ni and Cu content, and Mn/Fe relationsh~ observed. Abt. fur Ange. Lagersta. der RWTH, Aachen, FRG. (gsb)