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本文运用碳酸钙地层学方法研究了南海东北部的13条沉积物岩心的碳酸钙含量特征,识别了三组沉积物岩心:第一组为分布在南海碳酸盐溶跃面之上、碳酸钙旋回遵循南海“溶跃面规律”的HD26、HD48和HD69等岩心,它们的平均沉积速率最低;第二组是分布在溶跃面之上、碳酸钙旋回不遵循南海“溶跃面规律”的HD4、HD170、HD196A和HD319等岩心,它们临近河口入海处,主要受河流携带的陆源物质的影响,平均沉积速率最高;第三组岩心为溶跃面之下、碳酸钙旋回遵循南海“溶跃面规律”的HD77、HD83、HD86V、HD109、HD133、HD200等岩心,平均沉积速率在三组岩心中属于中等。碳酸钙地层学研究表明,这些岩心最多可以划分出三个沉积时期,对应于氧同位素1、2、3期,它们在不同时期物源供应存在变化。
In this paper, the calcium carbonate content characteristics of 13 sedimentary cores in the northeastern South China Sea were studied by using calcium carbonate stratum method, and three sedimentary cores were identified: the first group is distributed above the carbonate flooding surface in the South China Sea, the other is calcium carbonate The cores of HD26, HD48 and HD69 which follow the law of the “sea surface” of the South China Sea are cycled back and forth, with the lowest average sedimentation rate. The second group is distributed over the surface of the leapfrog and the rotation of the calcium carbonate does not follow the “South China Sea” The cores of the HD4, HD170, HD196A and HD319 are close to the mouth of the estuary and are mainly affected by the terrestrial material carried by the rivers with the highest average sedimentation rate. The third group of cores is under the surface of the solution and the calcium carbonate cycle follows In the South China Sea, the cores of HD77, HD83, HD86V, HD109, HD133, HD200 and other cores of the “law of surface melting” have the average sedimentation rate which is moderate among the three cores. Calcium carbonate stratigraphic studies have shown that these cores can be divided into up to three depositional periods, corresponding to the oxygen isotopes 1, 2 and 3, they supply at different times there are changes.