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首页> 外文会议>23rd New Zealand Geothermal Workshop 2001, 2001, Auckland >BIOMINERALISATION IN NEW ZEALAND GEOTHERMAL AREAS
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BIOMINERALISATION IN NEW ZEALAND GEOTHERMAL AREAS

机译：新西兰地热地区的生物医学化

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Several experiments are currently underway to investigate the role of bacteria in the formation of unique textures in sinter deposits at New Zealand geothermal areas,. Preliminary results are presented from three areas: Wairakei, Rotokawa, and Waiotapu. In the Main Drain at Wairakei, thermophilic filamentous bacteria are growing at ～62℃ at a rapid pace and are progressively sheathed or replaced by amorphous silica, building large 3-D fan-shaped structures. Siliceous microstromatolites at Rotokawa, located in the outwash from hot springs (60 - 85℃), grow at a much slower rate maintaining a level just above the water surface. Growth is initiated on protruding pumice stones and wood fragments. At Champagne Pool, Waiotapu, siliceous microstromatolites grow on native sulphur accumulated around the pool edge or on protruding parts of the pool bottom. Their rate of growth (0.02 - 0.03 mm day~(-1)) and size is greater than at Rotokawa. Orange precipitates in the pool, previously identified as flocculated antimony rich sulphides and sulphur, appear to be entirely biomediated. It is not known whether the bacteria are actively metabolising sulphur or antimony or whether biomineralization is passive. These biomineralization effects strongly increase surface areas for potential metal - mineral - microbe interactions and thus effect metal distributions in sinter deposits.
机译：目前正在进行数项实验，以研究细菌在新西兰地热地区烧结矿中形成独特织构的作用。初步结果来自三个领域：怀拉基，鲁托卡瓦和怀奥塔普。在怀拉基（Wairakei）的主排水道中，嗜热丝状细菌在〜62℃处迅速生长，并逐渐被无定形硅石包裹或取代，形成大型的3D扇形结构。 Rotokawa的硅质微叠层石位于温泉（60-85℃）的冲刷物中，其生长速度要慢得多，保持在水面上方的水平。生长在突出的浮石和木材碎片上开始。在Waiotapu的香槟池中，硅质微叠层石生长在池边缘周围或池底部突出部分上积累的天然硫上。它们的生长速度（0.02-0.03毫米天〜（-1））和大小都比轮川大。池中的橙色沉淀物，以前被鉴定为絮凝的富含锑的硫化物和硫，似乎完全是生物介导的。目前尚不清楚细菌是否在积极代谢硫或锑，或者生物矿化是否是被动的。这些生物矿化作用极大地增加了潜在的金属-矿物-微生物相互作用的表面积，从而影响了烧结矿中金属的分布。

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