| 三水盆地古近系土布心组黑色页岩中黄铁矿的形成及其控制因素 |
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| 引用本文： | 刘春莲,董艺辛,车平,Franz T Fürsich,石贵勇,陈亮,严伟术.三水盆地古近系土布心组黑色页岩中黄铁矿的形成及其控制因素[J].沉积学报,2006,24(1):75-80. |
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| 作者姓名： | 刘春莲 董艺辛 车平 Franz T Fürsich 石贵勇 陈亮 严伟术 |
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| 作者单位： | 中山大学地球科学系 广州 510275 |
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| 基金项目： | 中国科学院资助项目
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广东省博士启动基金
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教育部重点实验室基金 |
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| 摘 要： | 黄铁矿是富有机质沉积的特征矿物。根据TOC/S、TOC/DOP、S/Fe关系以及S TOC Fe多重线性回归分析结果对三水盆地古近系〖HT5”,6”〗土〖KG-*3〗布〖HT5”SS〗心组红岗段黑色页岩中沉积黄铁矿的形成及其控制因素进行了分析。土布心组红岗段黑色页岩的黄铁矿有成岩黄铁矿和同生黄铁矿两种成因组分。红岗段下部（亚段A）有机碳含量普遍较低，底部水体以弱氧化条件为主，硫酸盐还原作用发生于沉积物/水界面以下，黄铁矿为成岩成因，其形成主要受有机质的限制。红岗段中上部（亚段B和C）的沉积条件变化频繁，其有机碳含量变化幅度大。富有机质（TOC>4%）岩层形成于缺氧的底部水体条件下。水体中可含H2S，碎屑铁矿物在埋藏之前即与之在水体中反应形成同生黄铁矿。这一过程不受有机质的限制，而是受活性铁与H2S接触时间的限制。同时，由于大量淡水输入导致硫酸盐浓度的降低，从而对硫化物形成有一定的限制作用。对于低有机质（TOC<4%）样品，黄铁矿由同生和成岩组分组成。其中以成岩黄铁矿为主，其形成过程主要受有机质限制，而同生黄铁矿受铁矿物与H2S接触时间的限制。
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| 关 键 词： | 黄铁矿形成 限制因素 黑色页岩 土布心组 古近系 三水盆地 |
| 文章编号： | 1000-0550（2006）01-0075-06 |
| 收稿时间： | 2005-04-15 |
| 修稿时间： | 2005-04-152005-06-20 |
Pyrite Formation and Its Controls in Black Shales of the Buxin Formation (Lower Eocene) from the Sanshui Basin, Guangdong |
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| LIU Chun-lian,DONG Yi-xin,CHE Ping,Franz T Fürsich,SHI Gui-yong,CHEN Liang,YAN Wei-shu.Pyrite Formation and Its Controls in Black Shales of the Buxin Formation (Lower Eocene) from the Sanshui Basin, Guangdong[J].Acta Sedimentologica Sinica,2006,24(1):75-80. |
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| Authors: | LIU Chun-lian DONG Yi-xin CHE Ping Franz T Fürsich SHI Gui-yong CHEN Liang YAN Wei-shu |
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| Institution: | Department of Earth Sciences, Sun Yat Sen (Zhongshan) University, Guangzhou 510275 |
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| Abstract: | Analyses of TOC/S,TOC/DOP,S/Fe relationships and S-TOC-Femultiple linear regression were carried out to determine limiting factors for pyrite formation in black shales of the Honggang Member(Lower Eocene Bu-xin Formation) in the Sanshui Basin.Submember A,showing lower organic carbon and higher iron contents than the other submembers,deposited in oxygenated bottom waters.Bacterial sulfate reduction took place below the sediment-water interface,and pyrite was formed diagenetically and organic carbon was limited.Submember B and C are characterized by large variations in organic carbon content.Organic-rich(TOC>4%) rocks deposited under anoxic environments,in which H_(2)S presented above the sediment water interface as well as within the sediments.Pyrite was formed syngenetically and confined by the duration during which iron detritus reacted with H_(2)S in the water column and by the availability of dissolved sulfate that decreased due to an increasing input of fresh waters.For organic-poor(TOC<4%) sediments,pyrite was of syngenetic and diagenetic.Organic carbon-limited diagenetic pyrite added to the earlier formed syngenetic pyrite,which was controlled by the time that iron minerals remained in contact with H_(2)S in anoxic waters. |
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| Keywords: | pyrite formation controls black shale Buxin Formation Lower Eocene Sanshui Basin |
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