I have worked on gold metallogenic experimental simulation.Gold source is one of my leading research. Some researchers have argued that Au may be sourced from oceanic crust relating to slab subduction. So i want to know how gold reside in MORB, which is the predominant component of oceanic crust.Please give me some advice or guidlines.
Hi Du Jun,
Gold contents in MORB are generally low, in ppb range. It is mostly hosted in sulfide minerals if MORB is saturated in sulide, which is the most case. This is because MORB usually forms at relatively reduced condition, permitting sulfide melt immiscibly separates from the basalt melt, and Au prefers entering into sulfide melt due to its high partition coefficient between the sulfide melt and silicate melt. Therefore, most of the gold must reside in sulfide minerals in the MORB.
Regards,
Xue-Ming Yang
Hi, Mr Jafar and Mr Yang,
Thank you very much for your good suggestions. Mantle plume may be an ultimate source of gold or an efficient exchange between crust and mantle. Sulfide minerals are main host of gold in metabasalts, Do you think the subducting oceanic slab can provide gold to some gold deposits like those occurred in Jiaodong province, China.
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