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南海北部内陆架沉积物主要来源于陆源碎屑,它们通过河流源源不断输入南海,暴雨、洪水构成的片流亦将泥沙滚滚推进海区,波浪和海流对海岸、海峡底壁的侵蚀和磨蚀,也提供了部分物质来源,进入海底的陆源物质在海洋水动力条件作用下进行沉积分异,粗碎屑主要堆积在粤西、海南岛、广西沿岸20米水深以内,局部海区生物繁殖昌盛,形成珊瑚礁平台、有孔虫砂、贝壳砂,在河口,海湾区发育有化学成因的粘土矿物和各类自生矿物,南海现代沉积物厚度不大,是海进时间较短的缘故.沉积物分布受多种因素控制,海平面变化则起着主导作用。
The sediments of the northern South China Sea are mainly derived from terrigenous debris. They are continuously input into the South China Sea through rivers. The heavy currents and floods of sheet sediment also push the sediment into the sea, and the erosion and erosion of the sea and the currents on the coastal and strait bottom walls , But also provided some material sources. The terrigenous materials entering the seabed were deposited and separated under the hydrodynamic conditions of the oceans. The coarse clastic was mainly deposited within the depth of 20 meters in the western Guangdong, Hainan Island and Guangxi coasts, Formation of coral reef platform, foraminiferal sand, shell sand, in the estuary, the Gulf developed a chemical deposit of clay minerals and various types of authigenic minerals, the South China Sea modern sediment thickness is small, is the sea into the shorter time reason. Sediment distribution Under the control of many factors, sea level changes play a leading role.