论文部分内容阅读
南黄海陆架区,作为地球轨道事件的代表,最明显的表现是海侵—海退序列。其中海侵层HⅠ、HⅣ、HⅤ、HⅥ、HⅦ分别与氧同位素1、5、7、13、23等温暖阶段相对应。主要的海侵周期受控于地球轨道要素所引起的全球变化进程。 关于非轨道事件,在南黄海发现了新仙女木事件(Younger Dryas)的证据,在~(14)C测年11100±260aB.P.至10340±110aB.P.这一时段,出现了海平面短时期下落;孢扮资料发现11100aB.P.以前的植被由栎树落叶阔叶林—草原突变为干旱草原植被,持续到11340aB.P.再度变为栎树落叶阔叶林植被,证明这段时间发生了突然变旱及降温事件。从碳氧同位素资料还发现14100±810aB.P.(~(14)C)之后的冰消期在新仙女木期之前有两期更短时间的降温,可对应于老仙女木期(Older Dryas)和最老仙女木期(Oldest Dryas)。
The South Yellow Sea shelf area, the most obvious manifestation of the Earth orbital event, is the transgression-regression series. Among them, the HⅠ, HⅣ, HⅤ, HⅥ and HⅦ in the transgressive layer correspond to the isothermal phases of oxygen isotopes 1,5,7,13,23, respectively. The main period of transgression is controlled by the global change process caused by the Earth’s orbital elements. In the case of non-orbital events, evidence of the Younger Dryas event was found in the southern Yellow Sea. At ~ (14) C dating of 11100 ± 260aB.P. to 10340 ± 110aB.P., Sea level Short period of fall; spore play found 11100aB.P. former vegetation from the oak deciduous broad-leaved forest - grassland mutation into arid steppe vegetation, until 11340aB.P once again become oak deciduous broad-leaved forest vegetation, proving this A sudden drought and cooling events took place. From the carbon and oxygen isotope data also found 14100 ± 810aB.P. (~ (14) C) after the ice out in the wood stage before the new fairy two cool period, corresponding to the old fairy wood (Older Dryas ) And the oldest Oldest Dryas.