| 晚中新世西太平洋暖池的浮游有孔虫和氧同位素证据 |
| |
| 引用本文： | 李前裕,李保华,钟广法,周祖翼,成鑫荣,王吉良,汪品先.晚中新世西太平洋暖池的浮游有孔虫和氧同位素证据[J].地球科学,2006,31(6):754-764. |
| |
| 作者姓名： | 李前裕 李保华 钟广法 周祖翼 成鑫荣 王吉良 汪品先 |
| |
| 作者单位： | 同济大学海洋地质国家重点实验室,上海,200092;阿德莱得大学地球与环境科学学院,澳大利亚 SA5005;南京地质古生物研究所,南京 210008;同济大学海洋地质国家重点实验室,上海,200092 |
| |
| 基金项目： | 国家自然科学基金;国家重点基础研究发展计划(973计划) |
| |
| 摘 要： | 浮游有孔虫深水种Globoquadrina dehiscens于10Ma左右从西太平洋和南海绝灭, 要比其他地区早大约3Ma.伴随这一事件还见以表层暖水种增多而深水种大幅度减少为主要特征的生物群变化.古生物和氧同位素结果指示当时表层水变暖和温跃层变深, 我们认为是与早期西太平洋暖池的发育有关.该种在西北和西南太平洋呈阶段性消失也说明暖水堆集比赤道区更强, 尽管印尼海道在晚中新世已大为变窄, 穿越印尼海道的径流可能尚保持较高的通量水平而使赤道区暖水堆集不特别明显.南海的浮游氧同位素值通常比开放西太平洋的低, 也说明中新世时期的上层海水环境与现代相似, 都是暖池边缘区比中心区变化大.暖池边缘区水体环境多变和温度梯度较高可能是受季风的影响, 结果造成深水种的降低和G.dehiscens提早从南海地区绝灭.
|
| 关 键 词： | 西太平洋暖池 南海 印尼海道 中新世 浮游有孔虫 氧同位素 |
| 文章编号： | 1000-2383（2006）06-0754-00 |
| 收稿时间： | 2006-04-15 |
| 修稿时间： | 2006-04-15 |
Planktonic Foraminifer and Oxygen Isotopic Evidence of a Late Miocene Western Pacific Warm Pool |
| |
| LI Qian-yu,LI Bao-hua,ZHONG Guang-fa,ZHOU Zu-yi,CHENG Xin-rong,WANG Ji-liang,WANG Pin-xian.Planktonic Foraminifer and Oxygen Isotopic Evidence of a Late Miocene Western Pacific Warm Pool[J].Earth Science-Journal of China University of Geosciences,2006,31(6):754-764. |
| |
| Authors: | LI Qian-yu LI Bao-hua ZHONG Guang-fa ZHOU Zu-yi CHENG Xin-rong WANG Ji-liang WANG Pin-xian |
| |
| Institution: | 1. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China ;2. School of Earth and Environmental Sciences, The University of Adelaide, Adelaide SA 5005, Australia ;3. Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing 210008, China |
| |
| Abstract: | The disappearance at ~10 Ma of the deep dwelling planktonic foraminifer Globoquadrina dehiscens from the western Pacific including the South China Sea was about 3 Ma earlier than its final extinction elsewhere. Accompanying this event at ~10 Ma was a series of faunal turnover characterized by increase in mixed layer, warm-water species and decrease to a minimum in deepwater species. Paleobiological and isotopic evidences indicate sea surface warming and a deepened local thermocline that we interpret as related to the development of an early western Pacific warm pool. The stepwise decline of G. dehiscens and other deep dwelling species from the NW and SW Pacific suggests more intensive warm water pileup than equatorial localities where surface bypass flow through the narrowing Indonesia seaway appears to remain efficient during the Late Miocene. Planktonic 18O values from the South China Sea consistently lighter than the tropical western Pacific during the Miocene also suggest, similar to today, more variable hydrologic conditions along the periphery than in the core of the warm pool. Stronger hydrologic variability affected mainly by monsoons and increased thermal gradient along the western margin of the Late Miocene warm pool may have contributed to the decline of deep dwelling planktonic species including the early extinction of G. dehiscens from the South China Sea region. |
| |
| Keywords: | western Pacific warm pool (WPWP) South China Sea Indonesian seaway Miocene planktonic foraminifer oxygen isotope |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《地球科学》浏览原始摘要信息 |
| 点击此处可从《地球科学》下载免费的PDF全文 |
|
