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| 藏南白垩系黑-红层沉积岩有机质组成分布特征 | |
| 引用本文： | 傅培刚,宋之光,胡修棉,王成善.藏南白垩系黑-红层沉积岩有机质组成分布特征[J].地质学报,2008,82(1):85-91. |
| 作者姓名： | 傅培刚 宋之光 胡修棉 王成善 |
| 作者单位： | 1. 中国科学院广州地球化学研究所有机地球化学国家重点实验室,广州,510640;中国科学院研究生院,北京,100039 2. 中国科学院广州地球化学研究所有机地球化学国家重点实验室,广州,510640 3. 南京大学地球科学系,南京,210093 4. 中国地质大学青藏高原地质研究中心,北京,100083 |
| 基金项目： | 国家重点基础研究发展计划(973计划) |
| 摘 要： | 对藏南江孜县床得剖面白垩系黑层和红层沉积岩进行的有机地球化学研究表明,黑层有机碳含量高于红层5～10倍,红层和黑层饱和烃主峰碳数分别为nC25和nC23;黑层和红层沉积有机质的母质来源都以水生植物和菌藻类等低等生物为主,陆源有机质的输入非常有限;但饱和烃的分布和主峰碳数的差异可能反映了有机母源物质在种群方面的差异,而这种差异可能主要是水体温度存在差异造成的,即红层发育时期水体温度可能高于黑层沉积时期.而在高温度条件下,水生生物和陆生植物的生长发育受到限制,造成原始有机质产率和有机质沉积保存量低可能是红层沉积岩形成的主要原因. |
| 关 键 词： | 白垩系黑-红层沉积岩 有机质丰度组成 生物标志化合物 藏南白垩纪古环境 藏南 白垩系 红层 沉积岩 原始有机质 组成 分布特征 Southern Tibet Sediments Red Bed Black Cretaceous Organic Matter Distribution 存量 产率 生长发育 陆生植物 水生生物 温度条件 |
| 收稿时间： | 2007-08-28 |
| 修稿时间： | 2007-11-02 |
The Composition and Distribution of Organic Matter of the Cretaceous Black and Red Bed Sediments from Southern Tibet |
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| FU Peigang,SONG Zhiguang,HU Xiumian,WANG Chengshan.The Composition and Distribution of Organic Matter of the Cretaceous Black and Red Bed Sediments from Southern Tibet[J].Acta Geologica Sinica,2008,82(1):85-91. | |
| Authors: | FU Peigang SONG Zhiguang HU Xiumian WANG Chengshan |
| Institution: | FU Peigang,SONG Zhiguang,HU Xiumian,WANG Chengshan State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,Guangdong, Department of Earth Sciences,Nanjing University,Nanjing,Jiangsu, Geological Centre of the Qinghai-Tibetan Plateau,China University of Geosciences |
| Abstract: | The organic geochemistry study on the black and red-beds of Cretaceous sediments from Chuangde section of Gyangze in southern Tibet shows that the Organic carbon content of black beds is 5 to 10 times that of red beds, the predominant carbon number of the normal alkane in the black and red bed sediments are nC23 and nC25, respectively; The parent organic matter of both black and red beds was predominantly aquatic plants, and algae and bacteria with minor being terrestrial matter. It is likely that the difference in the predominant carbon number of normal alkane in the black bed and red bed may be indicative to temperature difference during the red bed and black bed sedimentation. It is also suggested that the red bed deposited at a slightly higher temperature than the black bed. Under the high temperature condition, development of marine organism and terrestrial plant were restrained, resulting in the decreasing of reproduction and preservation of original organism during the sedimentation of the red bed. |
| Keywords: | Cretaceous black and red beds organic matter abundance and composition biomarkers paleoenvironment of cretaceous time in south Tibet |
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