墨西哥湾布什山冷泉碳酸盐岩沉积岩石学及地球化学

邸鹏飞; 冯东; 陈多福; Harry H Roberts

doi:10.3724/SP.J.1140.2009.02049

墨西哥湾布什山冷泉碳酸盐岩沉积岩石学及地球化学

邸鹏飞^1,2,3,
冯东^1,2,
陈多福^1,2,
Harry H Roberts⁴

1 中国科学院广州地球化学研究所边缘海地质重点实验室, 广州 510640;
2 中国科学院广州天然气水合物研究中心, 广州 510640;
3 中国科学院研究生院, 北京 100049;
4 Coastal Studies Institute, Louisiana State University, Baton Rouge, LA 70803, USA

基金项目:

中国科学院广州天然气水合物研究中心项目(o807s4)

国家杰出青年基金项目(40725011)

国家重点基础研究规划项目(2009CB219506)

NSFC-广东联合基金项目(U0733003)

详细信息

作者简介:
邸鹏飞(1982-),男,博士生,主要从事海底冷泉及天然气水合物研究,E-mail:dipf06@gig.ac.cn

中图分类号: P736.3
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出版历程
- 收稿日期: 2008-11-12
- 修回日期: 2009-03-03

GEOLOGY AND GEOCHEMISTRY OF SEEP CARBONATES FROM BUSH HILL OF THE GULF OF MEXICO

1 Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;
2 Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China;
3 Graduate University of the Chinese Academy of Sciences, Beijing 100049, China;
4 Coastal Studies Institute, Louisiana State University, Baton Rouge, LA 70803, USA

摘要

摘要: 对墨西哥湾布什山采集的7块冷泉碳酸盐岩样品进行了沉积岩石学及地球化学研究,结果表明:冷泉碳酸盐岩以结壳的形式产出,结壳中双壳类和管状蠕虫等冷泉生物碎屑发育,结壳主要由泥晶、微晶和亮晶文石组成(含量89%~99%,平均94%)。碳酸盐岩¹³C中等亏损(δ¹³C最负值为-29.4‰,PDB),表明碳的来源主要是非甲烷的碳烃化合物,¹⁸O相对富集(δ¹⁸O为+2.4‰~+5.0‰,PDB),可能与原地水合物分解形成富集¹⁸O的孔隙水有关。碳酸盐矿物相(5%硝酸可溶部分)的稀土元素总量较低(0.40×10^-6~20.85×10^-6),稀土元素Ce异常特征和页岩标准化配分模式在不同样品、甚至同一样品结晶程度不同的碳酸盐矿物相(泥晶、微晶和亮晶)中变化显著,表明布什山冷泉碳酸盐岩形成过程中氧化还原条件复杂多变,控制氧化环境变化的主要因素可能是流体的渗漏速率。
- 冷泉碳酸盐岩 /
- 碳氧稳定同位素 /
- 稀土元素 /
- 布什山 /
- 墨西哥湾
Abstract: Seven seep carbonates from Bush Hill (GC185) seep and hydrate site of the Gulf of Mexico are studied by sedimentary petrology and geochemistry. The result is that the seep carbonates occur as crusts. The crusts mainly consist of microcrystalline, microspar, and sparite aragonites (89%~99% with an average of 94%). Seep community, e.g. bivalve shells and tube worms are well preserved in the crusts. The moderate ¹³C depletion of the carbonates (the most depleted one has δ¹³C value of -29.4‰) indicates that non-methane hydrocarbons (C₅⁺) were incorporated during the precipitation of the carbonates. Relatively enrichment of ¹⁸O in the carbonate (δ¹⁸O:+2.4‰~+5.0‰ PDB) may be related to in situ destabilization of gas hydrate. The total content of rare earth element (REE) of the 5% HNO₃^- treated solution of the carbonates is low (0.40~20.85×10^-6). The shale-normalized REE patterns show varied Ce anomalies(significantly negative, slightly negative, and no Ce anomalies). Ce anomalies are obvious in different samples and even in the same sample of different degrees of crystallization(microcrystalline, microspar and sparite),suggesting that the formation conditions of the Bush Hill seep carbonate is variable and complex, which is possibly controlled by the rate of fluids flow. We investigated the heterogeneity of isotopes and trace elemental concentrations on micro-scales in a seep site of Bush Hill of the Gulf of Mexico and its importance would be providing an example for studying the cold seeps in other regions and in ancient record.
- seep carbonate /
- stable carbon and oxygen isotopes /
- rare earth elements /
- Bush Hill /
- Gulf of Mexico

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