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at water depths of about 3,500-4,000 metres, when hydrothermal fluids mix with cold surrounding seawaters, metal sulphides in the water are precipitated onto the chimneys and nearby seabed.
在水深约3 500-4 000米的地方,热液流体与四周冷海水混合时,水中的金属硫化物沉降到烟囱和附近的海底上。
attached to ropos are two video cameras, two robotic arms for taking samples of rocks or organisms, bottles for collecting water samples, a box for collecting biological samples and preserving them at in situ pressure and temperature, a suction sampler that can vacuum up sediments and organisms and a specialized water sampler for hydrothermal fluids.
"ropos "号装备有两台摄像机、两个用于采集岩石或生物样品的机械臂、用于收集水样的瓶子、一个用于收集生物样品并以现场温压加以保存的盒子、一个可吸取沉积物和生物的真空采样器以及一个专门用于收集热液的水样采集器。
49. for sulphide deposits, hydrothermal vent areas should be classified as either dormant vent sites, which are still under the potential influence of a heat source although there is no current venting of hydrothermal fluids evident at that time, or extinct sites, which are at sites remote from present-day heat sources.
49. 对于硫化物矿床,必须把热液活动状况分成两类,即目前没有喷发热液流体但仍受到热源潜在影响的休眠场址,或在远离当前热源的场址的死亡场址。