CAJ | 학술논문

为了探索和揭示2.5 MaBP前后东亚季风演变历史及植被演替对气候演化的响应,对南海南部大洋钻探ODP1143站(9°22'N、113°17'E)深海柱状样的上部135～95 m(3.0～2.0 MaBP)共146个孢粉样品进行了分析研究,时间分辨率为7 ka/样,孢粉谱显示沉积率变化显著,以2.6 MaBP为界可明显分为两个阶段,与前一阶段3.0～2.6 MaBP相比,2.6～2.0 MaBP时段各类型花粉及孢子沉积率均有显著提高.该结果表明2.6 MaBP南海海平面有显著下降,可与北半球冰盖形成、东亚季风增强相对应.2.6 MaBP以后,各类型孢粉沉积率高低变化揭示南海海平面有多次上升和下降,代表了多次冰期-间冰期旋回.该结果与深海氧同位素分期相对应.频谱分析表明3.0～2.0 MaBP存在0.1 Ma(偏心率)和46.9 ka(斜率)的周期.
위료탐색화게시2.5 MaBP전후동아계풍연변역사급식피연체대기후연화적향응,대남해남부대양찬탐ODP1143참(9°22'N、113°17'E)심해주상양적상부135～95 m(3.0～2.0 MaBP)공146개포분양품진행료분석연구,시간분변솔위7 ka/양,포분보현시침적솔변화현저,이2.6 MaBP위계가명현분위량개계단,여전일계단3.0～2.6 MaBP상비,2.6～2.0 MaBP시단각류형화분급포자침적솔균유현저제고.해결과표명2.6 MaBP남해해평면유현저하강,가여북반구빙개형성、동아계풍증강상대응.2.6 MaBP이후,각류형포분침적솔고저변화게시남해해평면유다차상승화하강,대표료다차빙기-간빙기선회.해결과여심해양동위소분기상대응.빈보분석표명3.0～2.0 MaBP존재0.1 Ma(편심솔)화46.9 ka(사솔)적주기.
In order to study vegetation evolution and environmental changes around 2.5 Ma B.P., a total of 146 pollen samples with an average time resolution of 7 000 years were analyzed in the deep-sea record at the depth of 135 - 95 m (in composition depth) from ODP Site 1143 (9° 22' N, 113° 17' E) in the southern South China Sea. The results show that the pollen influx has a distinct change. During 2.6 - 2.0 Ma B.P., the average value of pollen influx increased evidently compared with that of 3.0 - 2.6 Ma B.P. It shows that the sea level of SCS dropped dramatically around 2.6 Ma B.P., corresponding to the formation of the Northern Hemisphere ice-sheets and the enhancement of the East Asian Monsoon. The pollen influx variations reflect the glacial-interglacial cycles corresponding with the deep-sea oxygen isotope curve and indicate that the sea level of SCS rose and dropped many times after 2.6 Ma B.P. The spectrum analysis results of pollen influx show that there are cycles at 0.1Ma (eccentricity) and 46.9 ka (obliquity) during 3.0 - 2.0 Ma B.P.