| 意大利上新世古生产力的轨道驱动 |
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| 引用本文： | 丁晓辉,王汝建,李建如,黄恩清.意大利上新世古生产力的轨道驱动[J].地球科学进展,2007,22(10):1019-1026. |
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| 作者姓名： | 丁晓辉 王汝建 李建如 黄恩清 |
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| 作者单位： | 同济大学海洋地质国家重点实验室,上海,200092 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)
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国家自然科学基金
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上海市科委国际合作重点项目
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国家高技术研究发展计划(863计划) |
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| 摘 要： | 主要研究了意大利上新统3个剖面Punta Piccola、Cape Spertivento以及Punta Rossello蛋白石含量的变化，综合其它古环境指标对非洲季风和地中海表层生产力加以分析，研究表明，Punta Piccola剖面和Cape Spertivento剖面各古环境指标对岁差周期影响的响应明显而单纯，即岁差低值，对应氧同位素偏负，有机碳和蛋白石高值以及碳酸盐低值，说明地中海表层生产力明显受到岁差的驱动。岁差驱动下的北非夏季风导致尼罗河泛滥，带来的丰富营养元素使得生产力剧增，同时淡水注入，阻碍了水体的垂向交换，直接导致了海底的缺氧环境，硅藻利用深层营养产生勃发，并组成“藻席”，快速沉降到海底，使得有机碳迅速埋葬和保存，从而引发了腐泥层的形成。Punta Rossello剖面硅藻层证实了“藻席”的存在，但是蛋白石含量并不高。
HT5H]关 键 词:HT5K]
HT5H]中图分类号： 文献标识码：AHT5SS]HK]
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| 关 键 词： | 非洲季风 地中海 古生产力 岁差 上新世 |
| 文章编号： | 1001-8166（2007）10-1019-08 |
| 收稿时间： | 2007-09-02 |
| 修稿时间： | 2007-09-12 |
The Paleoproductivity Forced by Earth Orbital Forcing in Italy During Early Pliocene |
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| DING Xiao-hui,WANG Ru-jian,LI Jian-ru,HUANG En-qing.The Paleoproductivity Forced by Earth Orbital Forcing in Italy During Early Pliocene[J].Advance in Earth Sciences,2007,22(10):1019-1026. |
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| Authors: | DING Xiao-hui WANG Ru-jian LI Jian-ru HUANG En-qing |
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| Institution: | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China |
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| Abstract: | We studied the variability of the African monsoon and the Mediterranean sea surface productivity during the early Pliocene based on the analysis of some paleoenvironment proxies such as planktonic foraminifera oxygen isotope and biogenic compositions ( carbonate, biogenic opal and organic carbon) in three profiles respectively, Punta Piccola, Cape Spertivento and Punta Rossello in southern Italy. Our results show that during the early Pliocene, the increase of the Northern Hemisphere summer insolation which is also presented as low precession value is usually correlated to organic carbon and opal increases, carbonate decrease and the negative excursions of stable oxygen isotope. The variability of the proxies implies the sea surface productivity controlled by the precession. Enhanced runoff induced by the strengthened African summer monsoon brings abundant terrestrial nutrients and fresh water into the Mediterranean sea, which conduces to productivity blooming and anoxic condition in the Mediterranean sea bottom. Furthermore, opal thrives herein by using deep nutrient, buildups mats and decline fleetly into sea bottom so that organic carbon
is speedily buried and conserved, thus making
the sapropels come into being. Diatom layers in Punta Rossello profile confirm the existence of mats, but the content of opal in some layers is not high. |
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| Keywords: | African monsoon The Mediterranean Sea Paleoproductivity Precession Pliocene |
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