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1·Over time the chimneys collapse, creating the deposits of high-grade massive sulphides that so excite the deep-sea miners.

随着时间推移，烟囱坍塌，形成高品位块状硫化物矿床。这些矿床让深海矿业很感兴趣。

2·So why has it taken so long to move towards the commercial exploitation of deep sea massive sulphide deposits?

那么为什么深海金属硫化物矿的商业化开发要等这么长时间？

3·Till the late stage, the periodic sea-level changes resulted in the formation of the evaporite deposits in restricted shallow-water basin and mudstones and gravity-flow deposits in deep-water basins.

晚期因周期性的海平面变化导致形成局限浅水盆地、蒸发岩沉积和深水盆地泥岩和重力流沉积。