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首页> 外文期刊>Contributions to Mineralogy and Petrology >Detrital, metamorphic and metasomatic tourmaline in high-pressure metasediments from Syros (Greece): intra-grain boron isotope patterns determined by secondary-ion mass spectrometry
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Detrital, metamorphic and metasomatic tourmaline in high-pressure metasediments from Syros (Greece): intra-grain boron isotope patterns determined by secondary-ion mass spectrometry

机译：锡罗斯（希腊）高压沉积物中的碎屑，变质和变质电气石：二次离子质谱法测定的晶粒内硼同位素模式

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摘要

The boron isotopic composition of zoned tourmaline in two metasediments from the island of Syros, determined by secondary-ion mass spectrometry (SIMS), reflects the sedimentary and metamorphic record of the rocks. Tourmaline from a silicate-bearing marble contains small (≤20 μm) detrital cores with highly variable δ 11B values (−10.7 to +3.6‰), pointing to a heterogeneous protolith derived from multiple sources. The sedimentary B isotopic record survived the entire metamorphic cycle with peak temperatures of ∼500°C. Prograde to peak metamorphic rims are homogeneous and similar among all analysed grains (δ 11B ≈ +0.9‰). The varying δ 11B values of detrital cores in the siliceous marble demonstrate that in situ B isotope analysis of tourmaline by SIMS is a potentially powerful tool for provenance studies not only in sediments but also in metasediments. A meta-tuffitic blueschist bears abundant tourmaline with dravitic cores of detrital or authigenic origin (δ 11B ≈ −3.3‰), and prograde to peak metamorphic overgrowth zones (−1.6‰). Fe-rich rims, formed during influx of B-bearing fluids under retrograde conditions, show strongly increasing δ 11B values (up to +7.7‰) towards the margins of the grains. The δ 11B values of metamorphic tourmaline from Syros, formed in mixed terrigenous–marine sediments, reflect the B signal blended from these two different sources, and was probably not altered by dehydration during subduction.
机译：通过二次离子质谱法（SIMS）确定了来自锡罗斯岛的两个准沉积物中带状电气石的硼同位素组成，反映了岩石的沉积和变质记录。含硅酸盐大理石中的电气石含有小的碎屑岩心（≤20μm），其δ 11 B值变化很大（-10.7至+ 3.6‰），表明它是由多种来源衍生的异质原生岩。沉积的B同位素记录在整个变质循环中幸存下来，峰值温度约为500°C。在所有分析晶粒中，向峰变质边缘的推进是均匀且相似的（δ 11 B≈+ 0.9‰）。硅质大理石中碎屑岩心的δ 11 B值不断变化，表明SIMS电气石的原位B同位素分析是一种潜在的强大工具，不仅可以用于沉积物研究，也可以用于沉积物研究。变质蓝blue携带着丰富的电气石，其碎屑或自生成因（δ 11 B≈-3.3‰）的漂流岩心，并晋升为变质过度生长高峰区（-1.6‰）。在含B的流体逆行流入期间形成的富铁轮辋，其向晶粒边缘的δ 11 B值显着增加（高达+ 7.7‰）。 Syros变质电气石的δ 11 B值形成在陆源-海洋混合沉积物中，反映了这两种不同来源混合的B信号，并且在俯冲过程中可能没有因脱水而改变。

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