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《Acta Sedimentologica Sinica》 1986-03
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AN APPROACH TO THE DETRITAL ASSEMBLAGES AND THEIR DISTRIBUTION PATTERNS IN THE SEDIMENTS OF THE CHINA SEA

Chen Lirong Shen Shunxi Xu Wenqiang Li Anchun ( Institute of Oceanology, Academia Sinica )  
We have made studies on the detrital mineral components and their distribution patterns in the sediments of the Bohai Sea, the Huanghai Sea ( Yellow Sea ) , the East China Sea, the northern continental shelf of the South China Sea, and Gulf of Tonkin. The results show that the sediments are made up of 59 mineral components. The light minerals ( less than 2.8 in specific gravity) are mainly quartz and feldspar. The heavy minerals such as hornblende, epidote, schistose minerals, ( muscovite + chlorite+ biotite ) and ilmenite preponderate in number. The garnet, zircon, dolomite, pyroxene and tourmaline come second. The contents of other minerals are very low. The distribution patterns of these minerals are described as follows: 1. Hornblende-schistose minerals The contents of these minerals decrease from north to south. Sediments with a high content of the hornblende ( 30% ) are distributed in the Huanghai Sea and the East China Sea, but its content ( 15% ) is considerably low in the sediments of the northern continental shelf of the South China Sea and Gulf of Tonkin. 2. Ilmenite-tourmaline These minerals differ from the above minerals on the dispersion pattern.The high contents of the ilmenite ( 20% ) are found in the northern continental shelf of the South China Sea and Gulf of Tonkin, while its content is 4 - 9 % in the Huanghai Sea and the East China Sea.Therefore, the contents of the ilmenite and tourmaline decrease from south to north. 3. Pyroxene-volcanic glass Their highest contents are found in the northern part of the Okinawa Trough (north of 27°N ) . In this region, the average content of the pyroxene is 24%, while in the other seas, its content is 1-3%. 4. Epidote The distribution pattern of the epidote is rather stable in the sediments of the areas we have investigated. Its content ranges generally from 10-15%. From the distribution patterns of above minerals we can see that different cha- racteristic minerals are found in the sediments of differnt sea areas. That is, the sediments of the Huanghai Sea are characterized by the high contents of the schistose minerals and garnet, and the sediments of the continental shelf of the East China Sea contain a significant amount of hornblende and dolomite. Rich pyroxene and volcanic glass deposits are found in the northern part of the Okinawa Trough ( north of 27° N) . The sediments with high contents of ilmenite and tourmaline are distributed in the northern continental shelf of the South China Sea and Gulf of Tonkin. The above data indicate that the China Sea can be divided into different mineral provinces on the basis of mineral assemblages. The distribution models of these mineral provinces are of the porphyritic ( for example, the Bohai Sea ) or of the belt patterns ( for example, the East China Sea ) Distribution patterns of detrital minerals in the sediments of the China Sea are chiefly controlled by the following factors: 1. Under the control of different source areas The sediments are brought to the China Sea mainly by the Huanghe, Changjiang and Zhujiang Rivers. The sediments of the Huanghai Sea and the southern part of the Bohai Sea are controlled by the sediments of the Huanghe River, while the materials of the Changjiang River are mainly deposited on the continental shelf of the East China Sea. The sediments on the northern continental shelf of the South China Sea are provided by the Zhujiang River. 2. Under the control of volcanic action Rich volcanic glass deposits are found in the northern part of the Okinawa Trough. 3. Under the control of submarine topography The contents of the muscovite and garnet vary considerably in those areas where the submarine topography is very complex. 4. Under the control of the sediment types and the sediment formative types The higher content of the ilmenite is found in the relict sediment regions where the well-sorted sands are distributed. Schistose minerals are concentrated in the modern sediment areas where the bad-sorted silt and mud are found. 5. Under the control of the hydr
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