冰后期最大海侵以来长江口潮波特性的变化

THE SULFUR-ISOTOPIC RELATIONS BETWEEN BULK AND SINGLE SULFIDES IN THE MODERN SEAFLOOR HYDROTHERMAL SEDIMENT AND ITS IMPLICATIONS

冰后期最大海侵时 ,现今长江三角洲地区为一巨大河口湾 ,研究古长江河口湾及其周围海域的潮波特性 ,并与现今长江口的进行对比 ,有助于深入了解长江三角洲形成发育的动力过程。根据冰后期最大海侵时古长江河口湾及其周围海域35个计算站一个半日潮周期的潮位、潮流过程曲线得知 ,冰后期最大海侵时古长江河口湾及其周围海域的潮波为驻波以及驻波 前进波混合型。此后 ,随着古长江河口湾被充填、长江口东进南移 ,长江口的潮波也逐渐转变为现今长江口的前进波型。

The sulfur isotopic values of bulk sulfide samples are between the most and the least value of sulfidic monomineral samples.If |δ2-δ1|<Δ,then the margin of δ(1+2) with the most and the least value of sulfidic monomineral samples is not more than Δ.If |δ2-δ1|>Δ, however the margin of δ(1+2) with the most and the least value of sulfidic monomineral samples may be more than Δ.For the modern seafloor hydrothermal sediments, without the effect biota and organic matter,it is reasonable to analyse the sulfur isotopic compositions of bulk sulfide samples for tracing metallogenetic element.