冲绳海槽中部现代海底热液活动在沉积物中的元素地球化学记录

翟世奎; 于增慧; 杜同军

冲绳海槽中部现代海底热液活动在沉积物中的元素地球化学记录

中国海洋大学, 海洋地球科学学院, 山东, 青岛, 266003

基金项目: 国家重大基础研究发展规划(“973”)资助项目(G2000078503);国家自然科学基金资助项目(40306009)

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出版历程
- 收稿日期: 2006-05-05
- 修回日期: 2006-07-26

Elemental geochemical records of modern seafloor hydrothermal activities in sediments from the central Okinawa Trough

College of Marine Geosciences.Ocean University of China. Oingdao 266003, China

摘要

摘要: 对采自冲绳海槽中部现代海底热液活动区的H9岩心沉积物进行了常量、微量元素分析,结果表明大部分元素含量在岩心75~80 cm处有一个明显的突变,上段中明显富集多种微量元素,这些元素正好对应于海槽中非热液活动区沉积物中相对亏损的元素,是热液活动区沉积物中的富集特征元素.75~80 cm处岩心沉积物中元素含量突变标志着冲绳海槽中部现代海底热液活动的开始或显著加强.除锰外,在其他热液活动区(如洋中脊等)显著富集的铁、铜、钴、镍在该区富集程度不高,但铅、鉮、锑、汞在上段岩心沉积物中的平均含量较下段高3~6倍,较非热液活动区沉积物中含量高3~12倍.这些富集元素与冲绳海槽热液活动成因硫化物中富集元素非常一致,表明该区热液活动对沉积物中锰、铅、鉮、锑、汞具有重要贡献,锰、铅、鉮、锑、汞是海槽中部现代海底热液活动的特征性示踪元素组合.岩心沉积物中很好地记录了热液活动的发展演化,该区海底热液活动从距今5740a开始发生或显著增强,并且一直持续到现在,只是其间活动程度经历了强弱变化,岩心上段锰的平均堆积速率约为40.461μg/(cm²·ka),与其他热液活动区的相当.
- 冲绳海槽 /
- 热液活动 /
- 沉积物记录 /
- 元素地球化学
Abstract: Major and minor element contents in the sediment core H 9 from the hydrothermal fields of the central Okinawa.Trough show a sharp change at the depth of 80 cm.The elements enriched in the upper 80 cm core are those enriched in the hydrothermal deposits and in the surface sediments recovered from the hydrothermal fields in the trough, which indicates the input of hydro thermal materials.Comparing with other hydrothermal sediments from Midocean Ridges or the LauBasin, the degree of the enrichment of elements firon, copper, cobalt and nickel is relatively low.However, the enrichment of elements manganese, lead, arsenic, stibium and mercury is remarkable.The average contents of these elements in the upper 80 cm core sediments are 3~6 times of those in the lower section, and 3~12 times of those in the surface sediments which are not influenced by the hydrothermal activities.The hydrot hermal activities have contributed significant manganese, lead, arsenic, stibium and mercury to the sediments, and these elements are distinct indicators for the hydrothermal activities in the Okinawa Trough.The significant enrichment of these elements in Core H9 upward from the depth 80 cm indicates the start or the significanten hancing of the hydrothermal activities in this area at about 5 740 a BP.The average accumulation rate of mang anese during this period is about 40.461 µg/(cm²·ka), which is similar to the hydrothermal sediments in the Lau Basin or the East Pacific Rise.
- Okinawa Trough /
- hydrothermal activity /
- elemental geochemical record /

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