Geostatistical Analysis of the Abundance and Grade of the Polymetallic Nodule Enriched Area of the Clarion-Clipperton Zone in the Pacific

Zhang Fuyuan; Shen Huati; Han Xiqiu

Geostatistics was applied to the analysis of the abundance and grade ( such as manganese, copper,cobalt and nickel) of the polymetallic nodules collected from the Clarion-Clipperton Zone in the Pacificand the excellent experimental variograms were obtained. The analytical results showed that the abun-dance range of the smooth nodule enriched area is about 50 ～ 60 km, the continuation of the surface nod-ule distribution is better than that of the rough nodule enriched area. The abundance variation is small inthe area. The four metal ranges or Cu, Co, Ni and Mn in the nodules are approximately 80 ～ 100 km, andthe phenomena of the anisotropy and the hole effects are not apparent; moreover, the abundance range ofthe area dominated by the rough noduies is about 40 ～ 50 km, and it is difficult to fit a smooth curvebased on the points on the experimental variograms of Co, Ni and Mn in the nodules. These metal rangesare nearly 100 km, and and the nost of the experimental variograms showed the phenomena of the shifts,the hole effects and the anisotropy, Considering other practical surver data and information, the majorfactors of affecting the stability of the variogram coule be atteributed to the inhomogeneous distributionof the surface nodules and the abundance variation from place to place. The resource( including the nod-ule and the metal amount) estimation errors calculated in the Kriging and arithmetic average method are1 ～ 2 % in general. The biggest error is less than 7 %. These results were similar to those of the prviouspractice. Research results also showed that the sampling distance of abundance is 28 km× 28 km, thenodule resource estimation error is 29. 45 % for the smooth nodule deposit and 36. 07 % for the rough nodule one, when the distance is reduced to the level of 13 km× 13 km, and the resource estimation erroris 23. 01 % for the rohgh nodule enriched area.

Second Institute of Oceanography,State Oceanic Administration Hangzhou 310012

Received Date: 1996-02-07

Key words:

Abstract: Geostatistics was applied to the analysis of the abundance and grade ( such as manganese, copper,cobalt and nickel) of the polymetallic nodules collected from the Clarion-Clipperton Zone in the Pacificand the excellent experimental variograms were obtained. The analytical results showed that the abun-dance range of the smooth nodule enriched area is about 50 ～ 60 km, the continuation of the surface nod-ule distribution is better than that of the rough nodule enriched area. The abundance variation is small inthe area. The four metal ranges or Cu, Co, Ni and Mn in the nodules are approximately 80 ～ 100 km, andthe phenomena of the anisotropy and the hole effects are not apparent; moreover, the abundance range ofthe area dominated by the rough noduies is about 40 ～ 50 km, and it is difficult to fit a smooth curvebased on the points on the experimental variograms of Co, Ni and Mn in the nodules. These metal rangesare nearly 100 km, and and the nost of the experimental variograms showed the phenomena of the shifts,the hole effects and the anisotropy, Considering other practical surver data and information, the majorfactors of affecting the stability of the variogram coule be atteributed to the inhomogeneous distributionof the surface nodules and the abundance variation from place to place. The resource( including the nod-ule and the metal amount) estimation errors calculated in the Kriging and arithmetic average method are1 ～ 2 % in general. The biggest error is less than 7 %. These results were similar to those of the prviouspractice. Research results also showed that the sampling distance of abundance is 28 km× 28 km, thenodule resource estimation error is 29. 45 % for the smooth nodule deposit and 36. 07 % for the rough nodule one, when the distance is reduced to the level of 13 km× 13 km, and the resource estimation erroris 23. 01 % for the rohgh nodule enriched area.

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Reference (10)

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Geostatistical Analysis of the Abundance and Grade of the Polymetallic Nodule Enriched Area of the Clarion-Clipperton Zone in the Pacific

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