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Exsolved magmatic fluid and its role in the formation of comb-layered quartz at the Cretaceous Logtung W-Mo deposit, Yukon Territory, Canada 期刊名称： Earth & Environmental Science Transactions of the Royal Society of超值服务
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作者： Jacob B. Lowenstern,W. David Sinclair广西玉林狗肉节
年份： 1996年男猪女蛇
期号： 第1-2期
关键词： volatiles;magma;degassing;comb quartz;comb layering;unidirectional
solidification textures;Mo;porphyry;infra-red
摘要：Comb-layered quartz is a type of unidirectional solidification texture
戏剧作文found at the roofs of shallow silicic intrusions that are often associated spatially
锐利造句
with Mo and W mineralisation. The texture consists of multiple layers of euhedral, prismatic quartz crystals (Type I) that have grown on subplanar aplite substrates.
The layers are parated by porphyritic aplite containing equant phenocrysts of quartz (Type II), which remble quartz typical of volcanic rocks and porphyry intrusions. At Logtung, Type I quartz within comb layers is zoned with respect to a number of trace elements, including Al and K. Concentrations of the elements as well as Mn, Ti, Ge, Rb and H are anomalous and much higher than found in Type II quartz from Logtung or in igneous quartz reported elwhere. The two populations appear to have formed
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