Elucidation of interaction between lithosphere/hydrosphere and biosphere based on iron isotopic compositions

基于铁同位素组成阐明岩石圈/水圈和生物圈之间的相互作用

• 批准号: 13440160
• 负责人: KATO Yasuhiro
• 金额: $ 10.94万
• 依托单位: The University of Totyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440160/
• 关键词: iron isotope; biomineraiization; iron deposit; banded iron formation; isotopicfractionation; ICP-MS; biomarker; bacteria

The aim of our study was to establish the outline of Fe isotopic for modern and ancient sediments and rocks and to elucidate interactions between lithosphere/hydrosphere and biosphere based on these Fe isotopes. We have gained scientific results as follows.(1)Major, trace and rare earth element contents were determined for sedimentary iron ores from the Gunma iron deposit. Preferential uptake of P,Sc,Cu, Mo, Ba, Th, and light REEs occurs in the iron ores (BIM ores) formed through biologically induced mineralization. Unique enrichment of these elements is a promising indicator of biomineralization for 〓〓cient sedimentary iron deposits (Kato et al.,2002, Resource Geology). The 57Fe/54Fe, 56Fe/54Fe and 57Fe/56Fe ratios for these iron deposits and meteoritic irons have been measured using a plasma mass spectrometry coupled with laser ablation sampling technique. Those of BIM ore are fractionated significantly, about 2〜7‰ for 57Fe/54Fe, 2〜5‰ for 56Fe/54Fe and 1〜3% for 57Fe/56Fe, indicating the mass-dependent fractionation feature with different degree of isotopic fractionation.(2) There is also a large Fe isotope fractionation in the iron ores preserving numerous algal fossils, near Sasebo (Nagasaki).(3) 3.46 Ga ferruginous cherls are interpreted to have been an in situ precipitate derived from a high-T hydrothermal solution emanating from a mid-oceanic ridge (Kato and Nakamura, 2003, Precambrian Research).(4) In-situ Fe isotopic ratio measurements for solid samples have been carried out using laser ablation-multiple collector-inductively couples plasma mass spectrometry (LA-MS-ICP-MS). Using a dry plasma condition achieved by laser sample introduction technique, mass spectrometric interferences could be successfully reduced (Hirata and Ohno, 2001, JAAS).

Fe同位素的概述的目的是基于Fe同位素的lethosper和sepimidation的相互作用。 gunma矿床中的铁矿石是在生物学诱导的矿物质中形成的铁矿石（BIM）。这些铁沉积物和灭气熨斗的56FE比例已使用血浆质谱级抽样技术测量。质量依赖的特征在铁矿石中保留了许多藻类化石，靠近sasebo（长崎） Ablamento collector诱导夫妇等离子质谱法（LA-MS-ICP-MS）。

项目成果

Nakamura, K., and Kato, Y.: "Carbonatization of oceanic crust by the submarine hydrothermal activity and its significance as a CO2 sink in the Early Archean (3.5 Ga) : II. Whole rock chemical composition (in Japanese with English abstr.)"Shigen Chishitsu.

Nakamura, K. 和 Kato, Y.：“海底热液活动对洋壳的碳化作用及其作为太古代早期 (3.5 Ga) 二氧化碳汇的意义：II. 全岩化学成分（日文与英文摘要）。

Kato, Y., Nakao, K., Isozaki, Y.: "Geochemistry of Late Permian to Early Triassic pelagic cherts from southwest Japan : implicationa for an oceanic redox change"Chemical Geology. 182/1. 15-34 (2002)

Kato, Y.、Nakao, K.、Isozaki, Y.：“日本西南部晚二叠世到早三叠世远洋燧石的地球化学：对海洋氧化还原变化的影响”化学地质学。

Hirata, T: "Determinations of Zr isotopic composition and U-Pbage for terrestrial and extraterrestrial zircons and baddeleytes using laser ablation-inductively coupled plasma mass spectrometly : implications for Nb-Zr isotopic systematics"Chemical Geology

Hirata, T：“使用激光烧蚀电感耦合等离子体质谱法测定陆地和地外锆石和斜锆石的 Zr 同位素组成和 U-Pbage：对 Nb-Zr 同位素系统学的影响”化学地质学

Kato, Y., Urabe T., and Kakegawa, T.: "Preface: A special issue devoled to 50th Anniversary Symposium: Mineral resources, Earth's environments and life"Resource Geology. 52. 81-82 (2002)

加藤 Y.、浦部 T. 和挂川 T.：“前言：50 周年研讨会特刊：矿产资源、地球环境和生命”资源地质学。

Nakamura, K, and Kato, Y: "Carbonate minerals in the Wanawoona Group, Pilbara Craton : Implications for continental crust, life, and global carbon cycle in the Early Archean"Resource Geology. 52. 91-100 (2002)

Nakamura, K 和 Kato, Y：“皮尔巴拉克拉通瓦纳乌纳群中的碳酸盐矿物：对太古宙早期大陆地壳、生命和全球碳循环的影响”资源地质学。