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太平洋西南缘(特别在吕宋、大陆巴布亚新几内亚、布干维尔、瓜达尔卡纳尔和斐济)的第三纪-第四纪斑岩铜-金矿床多半是在弧极倒转之后形成的.在未发生弧极倒转的地方(如:新西兰和日本)缺乏或少有斑岩铜-金矿床,因此,较老的斑岩铜-金矿床可作为构造作用史的有用线索。金在岩浆作用中富集起因于两阶段熔融。斑岩铜-金矿床的构造背景不同于奇主在火山岩中的块状硫化物矿床.
The Tertiary-Quaternary porphyry copper-gold deposits in the southwestern Pacific Ocean (especially in Luzon, mainland Papua New Guinea, Bougainville, Guadalcanal, and Fiji) were mostly formed after arc inversion. The absence of or lack of porphyry copper-gold deposits in areas where no arc inversion occurs (eg, New Zealand and Japan) and therefore older porphyry copper-gold deposits may serve as useful clues to the history of tectonism. The enrichment of gold in magmatism results from two-stage melting. The tectonic setting of the porphyry Cu-Au deposit is different from the massive sulphide deposit hosted by the volcanic rocks.