The studies of microelement, rare earth element and isotope compositions that the Huogeqi polymetallic ore field was formed in rift basin of back arc continental marging during Proterozoic Era.

从微量元素、稀土元素、同位素等方面论证了霍各乞矿田中元古宙为大陆边缘弧后裂谷盆地构造环境。

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The CME hiked gold marging requirements on Aug. 11 as investors piled in to gold futures as a safe haven.

FORBES: In Volatile Market, Watch Out For Margin Calls