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POSSIBLE CONTRIBUTION OF A METAL-RICH MAGMATIC FLUID TO A SEA-FLOOR HYDROTHERMAL SYSTEM

机译：富含金属的岩浆流体对海底热液系统的可能贡献

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THE source of the hydrothermal fluids vented in active volcanic areas on the sea floor(1-3) has been a matter of some debates(4-7); they may arise purely from the interaction of circulating sea water with the hot rocks through which it passes(1,3,8), or there mag be an admixture of a fluid escaping from magma at depth, as is seen in subaerial geothermal systems(9), The answer to this question also bears on the origin of the sulphide ores deposited by sea-floor hydrothermal systems, and their ancient analogues(8,10,11) preserved on land. Here we present direct evidence for the presence of magmatic fluid in the lavas that host an actively forming massive sulphide deposit in the eastern Manus back-are basin. We find high concentrations of chlorides and sulphides of ore-forming metals such as copper, zinc and iron in CO2-rich gaseous bubbles found both in melt inclusions frapped in the phenocrysts of the volcanic rocks, and in the matrix glass, We conclude that a metal-rich fluid was present in the magma before eruption, and probably exsolved as the pressure decreased. This finding suggests the possibility for the contribution of large quantities of ore- forming metals to a sea-floor hydrothermal system. [References: 37]
机译：在海底活动火山区中排放的热液流体的来源（1-3）是一些辩论的问题（4-7）；它们可能纯粹是由于循环海水与流过的热岩石之间的相互作用而引起的（1,3,8），或者在岩浆的深处逸出了从岩浆逸出的流体的混合物，如在地下地热系统中所见（ 9），这个问题的答案还取决于海底热液系统沉积的硫化矿石的起源，以及它们在陆地上保存的古代类似物（8,10,11）。在这里，我们为熔岩中存在岩浆流体提供了直接证据，这些熔岩在东部Manus背水盆地中形成了一个活跃形成的大规模硫化物矿床。我们发现在富含CO2的气泡中发现高浓度的成矿金属（如铜，锌和铁）的氯化物和硫化物，它们都存在于火山岩的表晶碎屑包裹的熔体包裹体和基质玻璃中，我们得出这样的结论：喷发前岩浆中存在富含金属的流体，并可能随着压力的降低而溶解。这一发现表明，可能存在大量成矿金属对海底热液系统的贡献。 [参考：37]

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