北部湾沉积物中自生针铁矿与菱锰矿团粒的研究

STUDY ON AUTHIGENIC GEOTHITE AND MANGAN SPARPELLETS IN THE SEDIMENT OF THE BEIBUGULF OF TONKIN

In this paper, mineralogy on the red-brown, black-brown, brown and light brown-yellow pellets from the western part of the Beibu Gulf of Tonkin(near the mouth of the Red, River) is studied. These pellets were collected from the 12 stations in this area. The results of our study showed that the red-brown and black-brown pellets are authigenic geothite while the brown and light brown-yellow pellets are authigenic mangan spar pellets. They are found in the same area. These iron and manganese are contributed from the Red River. After the materials of Red River were emptied into the Beibu Gulf the iron and manganese were condensed and deposited to form authigenic geothigenic geothite and mangan spar pellets.