识别蛇纹岩的高温变质-地球科学堆栈交换江南电子竞技平台江南体育网页版 最近30从www.hoelymoley.com 2023 - 07 - 10 - t12:28:17z //www.hoelymoley.com/feeds/question/5176 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/5176 8 识别蛇纹岩的高温变质作用 基尼 //www.hoelymoley.com/users/2563 2015 - 07 - 14 - t01:28:12z 2015 - 09 - 26 - t14:21:43z < p >什么样的矿物学结果当蛇纹岩改写在高温或UHT变质?我设想可能的场景,一个obducted蛇绿岩岩层埋和metamorphised增厚造山带。< / p >

Since seprentinite is hydrated/altered mafic or ultramafic rock, I would assume dehydration would be the first pathway. With further heating are serpentinites likely to yield melt? Could they end up as a 'normal' mafic granulite? Are there mineralogical or geochemical characteristics that could be used to identify a mafic granulite that started out life as a serpentinite?

 //www.hoelymoley.com/questions/5176/-/6601 # 6601 3 答案由戈登斯坦格识别蛇纹岩的高温变质作用 戈登斯坦格 //www.hoelymoley.com/users/4507 2015 - 09 - 26 - t14:21:43z 2015 - 09 - 26 - t14:21:43z < p >当然,任何超镁铁的岩石最终会融化在大约2000摄氏度,但之前,会有一些有趣的相变,可能涉及到蛇形>滑石>橄榄石+斜方辉石类。各种微妙的变化发生在在原水化从橄榄岩、蛇纹岩岩石。有高低温蛇纹岩。同位素研究表明,大多数暴露露头的蛇纹岩暴露在周围地下水水化温度。考虑会发生什么。Ca从原来的橄榄岩中的斜辉石最终Ca -或Ca-Mg -碳酸盐,其中大部分是丢失或沉淀。菲在原来的斜方辉石类、斜辉石和橄榄石是失去了从系统或re-precipitates针铁矿的网状结构。Cr的硅酸盐是排除在蜿蜒的晶格和铬铁矿晶体的表面留下一个分区之前Magnetite-Chromite结构均匀铬铁矿晶体。因为这些是惰性和耐火材料,他们应该生存任何后续脱水过程。任何倪可能生存在蜿蜒的晶格。 Summing up, when the serpentine is metamorphosed and turns back into peridotite, look for zoned chromite, reduced Ca (as clinopyroxene), and either reduced Fe, or Fe as a relict ghost sieve structure. Depending upon local circumstances there may, or may not, be a slight loss of silica during the hydration-dehydration cycle.

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