Geochemical study of seafloor hydrothermal systems as modern analogue of kuroko-type are deposits

作为现代黑子型矿床类似物的海底热液系统的地球化学研究

• 批准号: 16340173
• 负责人: ISHIBASHI Junichiro
• 金额: $ 10.43万
• 依托单位: KYUSHU UNIVERCITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16340173/
• 关键词: fluid chemistry; fluid inclusion; seafloor hydrothermal system; volcanic massive sulfide deposit; southwest Pacific; backarc basin; submarine arc volcano; backarc rifting; 熱水性鉱床; 背弧海盆; 鉱床成因論; 熱水化学組成; 海底熱水循環系; 黒鉱鉱床; 海底熱水活動; 熱水鉱床; マグマ性流体

In order to obtain the key information for ore forming process from fluid inclusions in ore samples of ancient kuroko-type VMSD (volcanic massive sulfide deposits), this research aimed to compare chemical composition of hydrothermal fluid and of fluid inclusion of sulfide/sulfate ores, both are collected from modern seafloor hydrothermal systems and tried to discuss relationship between the fluid chemistry and the tectonic setting. We developed analytical systems, the one is for gas composition determination using a gas chromatograph and the other is for minor anions analysis using a HPLC. Using these apparatuses, we determined gas composition of fluid inclusions in a massive sulfide ore sample. On the other hand, we also conducted field studies participating into some dive program to collect samples from seafloor hydrothermal systems in southwestern and northwestern Pacific. We analyzed both gas species and elemental species of the hydrothermal fluid samples obtained from active venting, and also mineral composition and fluid inclusion properties of the sulfide/sulfate ore samples collected from the same site. Based on these results, we found some geochemical signature reflecting the specific tectonic setting, such as significant enrichment in incompatible elements of the hydrothermal fluid in the tectonic setting where arc and backarc activities occur closely, and as extensive phase separation and fluid migration within sediment layer in the tectonic setting of continental margin. The geochemical data obtained in this study using the newly developed apparatuses also contributed to the collaborative microbiological studies.

为了从黑矿型VMSD（火山岩块状硫化物矿床）矿石样品中的流体包裹体中获得成矿作用的关键信息，本研究旨在比较现代海底热液系统中的热液流体和硫化物/硫酸盐矿石的流体包裹体的化学成分，并试图探讨流体化学与构造环境之间的关系。我们开发了分析系统，一个是使用气相色谱仪进行气体成分测定，另一个是使用HPLC进行微量阴离子分析。利用这些仪器，我们测定了一个块状硫化物矿石样品中流体包裹体的气体成分。另一方面，我们也参加了一些潜水计划，在西南太平洋和西北太平洋海底热液系统中进行了实地研究。我们分析了从主动通风获得的热液流体样品的气体种类和元素种类，以及从同一地点收集的硫化物/硫酸盐矿石样品的矿物组成和流体包裹体性质。在此基础上，我们发现了一些反映特定构造背景的地球化学特征，如在弧后活动密切的构造背景下，热液流体中不相容元素显著富集;在大陆边缘构造背景下，沉积层中存在广泛的相分离和流体运移。在这项研究中获得的地球化学数据，使用新开发的仪器也有助于合作的微生物研究。

项目成果

海底熱水活動地帯の化学環境を明らかにする試み

尝试厘清海底热液活动区的化学环境

• 发表时间: 2005
• 期刊: 海の研究 14
• 作者: M. sasao;et. al;石橋純一郎ほか
• 通讯作者: 石橋純一郎ほか

Expedition reveals changes in Lau Basin Hydrothermal System

• DOI: 10.1029/2006eo020001
• 发表时间: 2006-01
• 期刊: Eos, Transactions American Geophysical Union
• 作者: J. Ishibashi;J. Lupton;Toshiyuki Yamaguchi;J. Querellou;T. Nunoura;K. Takai

Selective phylogenetic analysis targeting 16S rRNA genes of hyperthermophilic archea in the deep-subsurface hot biosphere

针对深层热生物圈超嗜热古菌 16S rRNA 基因的选择性系统发育分析

• 发表时间: 2007
• 期刊: Appl. Envion. Microbiol. 73
• 作者: Takeshi Higashiguchi;et al.;N.Yugami et al.;H.Ito et al.;H.Kimura et al.
• 通讯作者: H.Kimura et al.

Unique geochemistry of submarine hydrothermal fluids from arc-back-arc settings of the western Pacific, Back-arc spreading systems : Geological, biological, chemical, and physical interactions

来自西太平洋弧后扩张系统的海底热液的独特地球化学：地质、生物、化学和物理相互作用

• 发表时间: 2007
• 作者: M. Sasao;et. al.;T.Gamo et al.
• 通讯作者: T.Gamo et al.

Direct access to the sub-vent biosphere by shallow drilling

通过浅钻直接进入地下喷口生物圈

• 发表时间: 2007
• 期刊: Oceans 20
• 作者: Takeshi Higashiguchi;et al.;N.Yugami et al.;H.Ito et al.;H.Kimura et al.;J.Ishibashi et al.
• 通讯作者: J.Ishibashi et al.