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Ti diffusion in quartz inclusions: implications for metamorphic time scales

机译：钛在石英夹杂物中的扩散：对变质时间尺度的影响

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摘要

Quartz inclusions in garnet from samples collected from the staurolite zone in central New England are zoned in cathodoluminescence (CL). The CL intensity is interpreted to be a proxy for Ti concentration and the zoning attributed to Ti diffusion into the quartz grains driven by Ti exchange between quartz and enclosing garnet as a function of changing temperature. The CL zoning has been interpreted using a numerical diffusion model to constrain the time scales over which the diffusion has occurred. Temperature-time histories are sensitive to the presumed peak temperature but not to other model parameters. The total time of the metamorphic heating and cooling cycle from around 450 °C to the peak temperature (550-600 °C) back to 450 °C is surprisingly short and encompasses only 0.2-2 million years for peak temperatures of 600-550 °C. The metamorphism was accompanied by large-scale nappe and dome formation, and it is suggested that this occurred as a consequence of- in-sequence thrusting resulting in a mid-crustal ductile duplex structure.
机译：石榴石中从新英格兰中部恒星石地区收集的样品中的石英内含物按阴极发光（CL）划分。 CL强度被解释为是Ti浓度的代表，而归因于Ti扩散到石英颗粒中的分区是由温度随温度变化而变化的，Ti是由石英和石榴石之间的Ti交换驱动的。已使用数值扩散模型解释了CL分区，以约束发生扩散的时间尺度。温度-时间历史对假定的峰值温度敏感，但对其他模型参数不敏感。从约450°C到峰值温度（550-600°C）再回到450°C的变质加热和冷却周期的总时间令人惊讶地短，并且对于600-550°的峰值温度仅涵盖了0.2-2百万年C。变质作用伴随着大规模的推覆和穹顶形成，这表明这是由于顺冲作用的结果，导致了中地壳韧性双工结构。

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