In winter, 1983, forty surface sediment samples were collected from the area off the Huanghe River Estuary, Huanghe and Luanhe Rivers,and the rivers in Northwestern Shandong Peninsula. The sediments off the Huanghe Ri...In winter, 1983, forty surface sediment samples were collected from the area off the Huanghe River Estuary, Huanghe and Luanhe Rivers,and the rivers in Northwestern Shandong Peninsula. The sediments off the Huanghe River Estuary are composed of biotite, hornblende, epidote,actinolite, tremolite, garnet, zircon, sphene, diopside, magnetite, ilmenite, hematite, apatite, hypersthene, schorl, monazite, topaz, muscovite,leucoxene, rutile, zoisite, clinozoisite, vesuvianite, kynite, wollastoite,enstatite, bronzite, xenotime, anatase, pyrrhotine, glauconite, quartz,orthoclase, plagioclase, calcite and authigenic pyrite. On the basis of their mineral assemblages, the investigated area may be divided into three mineral provinces. Huanghe River, Luanhe River and Longkuo mineral provinces. The materials were derived from the Huanghe River, Luanhe Delta and Northwestern Shandong Coastal Region respectively. The sands from the Huanghe River are different from other sources, and are characterized by high contents of biotite, muscovite, plagioclase and calcite, and but low contents of pyroxene, epidote, Zircon, garnet and orthoclase. During the flood periods the materials from the Huanghe River fall into the Laichau Bay and are transported towards NE direction, which has been formed main outline of the distribution minerals in the sediment off the Huanghe River Estuary. However, Rmode cluster analysis shows that the sorting of the detrital minerals in this area is not strong. The data of the measurement current and nutrient salt in the water support the conclusions which are obtained from mineralogy study.展开更多
In order to understand the origin of metal spherical minerals in the Okinawa Trough sediments, the authors have microscopically examined 215 samples (161 surface and 54 core samples) from 150 stations scattered in the...In order to understand the origin of metal spherical minerals in the Okinawa Trough sediments, the authors have microscopically examined 215 samples (161 surface and 54 core samples) from 150 stations scattered in the shallow-sea continental shelf and trough areas,on the basis of the extensive studies of detrital minerals in the East China Sea continental shelf sediments. It is found that no metal spherical minerals occur either in surface or in core samples from sediments in the vast shallow-sea continental area, with an occurrence probability of zero, while in the narrow trough area the occurrence probability is 43% or more. And their distribution, either in. lateral or in vertical direction, shows an obvious regional speciality. This regional speciality is related to the assemblage type in which volcanoclastic minerals are predominant in the Okinawa Trough sediments, i.e., the occurrence probability of metal spherical minerals is proportional to the contents of pyroxene of volcanic origin and volcanic glass. A few metal spherical minerals are found enclosed within the volcanic glass. These facts strongly.indicate that metal spherical minerals in the Okinawa Trough sediments are of terrestrial rather than cosmic origin.展开更多
文摘In winter, 1983, forty surface sediment samples were collected from the area off the Huanghe River Estuary, Huanghe and Luanhe Rivers,and the rivers in Northwestern Shandong Peninsula. The sediments off the Huanghe River Estuary are composed of biotite, hornblende, epidote,actinolite, tremolite, garnet, zircon, sphene, diopside, magnetite, ilmenite, hematite, apatite, hypersthene, schorl, monazite, topaz, muscovite,leucoxene, rutile, zoisite, clinozoisite, vesuvianite, kynite, wollastoite,enstatite, bronzite, xenotime, anatase, pyrrhotine, glauconite, quartz,orthoclase, plagioclase, calcite and authigenic pyrite. On the basis of their mineral assemblages, the investigated area may be divided into three mineral provinces. Huanghe River, Luanhe River and Longkuo mineral provinces. The materials were derived from the Huanghe River, Luanhe Delta and Northwestern Shandong Coastal Region respectively. The sands from the Huanghe River are different from other sources, and are characterized by high contents of biotite, muscovite, plagioclase and calcite, and but low contents of pyroxene, epidote, Zircon, garnet and orthoclase. During the flood periods the materials from the Huanghe River fall into the Laichau Bay and are transported towards NE direction, which has been formed main outline of the distribution minerals in the sediment off the Huanghe River Estuary. However, Rmode cluster analysis shows that the sorting of the detrital minerals in this area is not strong. The data of the measurement current and nutrient salt in the water support the conclusions which are obtained from mineralogy study.
文摘In order to understand the origin of metal spherical minerals in the Okinawa Trough sediments, the authors have microscopically examined 215 samples (161 surface and 54 core samples) from 150 stations scattered in the shallow-sea continental shelf and trough areas,on the basis of the extensive studies of detrital minerals in the East China Sea continental shelf sediments. It is found that no metal spherical minerals occur either in surface or in core samples from sediments in the vast shallow-sea continental area, with an occurrence probability of zero, while in the narrow trough area the occurrence probability is 43% or more. And their distribution, either in. lateral or in vertical direction, shows an obvious regional speciality. This regional speciality is related to the assemblage type in which volcanoclastic minerals are predominant in the Okinawa Trough sediments, i.e., the occurrence probability of metal spherical minerals is proportional to the contents of pyroxene of volcanic origin and volcanic glass. A few metal spherical minerals are found enclosed within the volcanic glass. These facts strongly.indicate that metal spherical minerals in the Okinawa Trough sediments are of terrestrial rather than cosmic origin.
