Abstract:

the paper, it is expounded that the distribution of abundance, coverage, metal grade, size and form of manganese nodules in the China" s Pioneer Inventor Area are mainly influenced by associated geological structure, topography, water depth, types of sediment, hiatus, bottom water current, volcanism.

I. INTRODUCTION

Manganese nodules arc the most important potential mineral resources in the sea bed. For this reason, many countries have been conducting exploration of manganese nodules in the C-C zone (refer to the region between the Clarion Fracture Zone and Clipperton Fracture Zone) on the Northeast Pacific Basin. Therefore, the knowledge of formation environments and distribution of manganese nodules is both of scientific and commercial significances. This paper tries to use the view of global tectonics and paleoocenography as a tool, on the basis of China" s investigations on manganese nodules in the Northeast Pacific Ocean, to probe into the law of distribution of manganese nodules in the China" s Pioneer Area.

2. Distribution of manganese nodules in the China" s Pioneer Investor Area

In abyssal plains and abyssal hills (below CCD, carbonate compensation depth) of Eocene-Miocene age in the China" s Investor Area, manganese nodules are diagenetic, they are rich in Mn, Ni and Cu and poor in Co and Fe, Manganese minerals are dominated by δ -MnO2 and tadorokite.

3. Cenozoic tectonic and Paleooceanographic events in the Pacific Ocean

Based on the results of DSDP and ODP with various geophysical research, many authors have reconstructed Cenozoic tectionic events and paleooceanographic evolution in the Pacific Ocean (Barker and Burrel,1976; Keller and Barron, 1983; 1987). One to the seafloor spreading and tile plate movement since the late Cretaceous, a series of volcanos, ridges and fracture zones have formed on the Pacific floor, such as the Line Is. Chain, the Marshall-Gilbert Is.

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