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首页> 外文期刊>Contributions to Mineralogy and Petrology >Boron isotopes in tourmaline as a tracer of metasomatic processes in the Bamble sector of Southern Norway
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Boron isotopes in tourmaline as a tracer of metasomatic processes in the Bamble sector of Southern Norway

机译：电气石中的硼同位素作为挪威南部博布尔地区变质过程的示踪剂

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The Bamble sector of southern Norway comprises metagabbros and metasediments that were metaso-matically altered to various extents during a late stage of the Sveconorwegian orogeny (-1.06 Ga). The infiltration of highly saline brines along veins led to penetrative scap-olitization and albitization on a regional scale and the local deposition of Fe-Ti oxides. Typical secondary mineral assemblages include either scapolite + apatite + amphi-bole + phlogopite + tourmaline, or albite + epidote + cal-cite + chlorite 4- white mica, indicating that the fluids introduced large amounts of Na, Cl, Mg, Ca, K, P, and B to the system. Metasomatic tourmalines associated with different alteration stages as identified by variations in major-element composition and initial ~(87)Sr/~(86)Sr were analyzed for B isotopic compositions to constrain possible sources and the evolution of the hydrothermal fluid(s). Measured δ~(11)B values range from -5 to +27‰ relative to SRM-951, suggesting marine evaporites interlayered with various amounts of continental detritus and pelagic clay as a possible B source reservoir. The influence of a seawater-derived component is clearly indicated by the heavy B isotope signature of tourmaline related to Al-Mg-rich metapelites. In contrast, negative δ~(11)B values can be explained by the influence of pneumatolytic fluids associated with granitic pegmatites. On a regional scale (i.e., several km), δ~(11)B values in tourmaline vary widely, whereas variations within a single outcrop (tens of m) are typically small and can be ascribed to different generations of tourmaline related to several fluid pulses.
机译：挪威南部的Bamble区段包含变质辉长岩和变质沉积物，这些变质在Sveconorwegian造山运动后期（-1.06 Ga）的变质作用程度有所不同。高盐度盐水沿静脉的渗透导致渗透性的肩cap骨化和区域化规模化和铁钛氧化物的局部沉积。典型的次生矿物组合包括方沸石+磷灰石+闪石+金云母+电气石，或钠长石+附子+钙铝石+绿泥石4-白云母，表明流体中引入了大量的Na，Cl，Mg，Ca，K ，P和B转到系统。通过对主要同位素组成和初始〜（87）Sr /〜（86）Sr的变化确定的与不同改变阶段相关的变质电气石进行了B同位素组成分析，以限制可能的来源和热液的演化。相对于SRM-951，测得的δ〜（11）B值在-5至+ 27‰范围内，表明海洋蒸发岩与各种陆相碎屑和浮游黏土夹层，可能是B源油藏。富含Al-Mg的变质石中碧玺的重B同位素特征清楚地表明了源自海水的成分的影响。相反，负δ〜（11）B值可以由与花岗岩伟晶岩相关的气溶流体的影响来解释。在区域尺度上（即几公里），电气石中的δ〜（11）B值变化很大，而单个露头（数十米）内的变化通常很小，并且可归因于与几种流体有关的电气石的不同世代。脉冲。

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