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首页> 外文期刊>Terra Nova >Modelling white mica pressure-temperature-time (P-T-t) paths using thermobarometric and Ar-40/Ar-39 thermochronologic data
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Modelling white mica pressure-temperature-time (P-T-t) paths using thermobarometric and Ar-40/Ar-39 thermochronologic data

机译:使用热磁化机和AR-40 / AR-39热量数据建模白色云母压力温度 - 时间(P-T-T)路径

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摘要

White micas are major rock forming minerals in igneous and metamorphic rocks, and their chemical and isotopic variations can be used to determine pressure, temperature and time (P-T-t) histories. We apply Ar-40/Ar-39 multi-diffusion domain modelling to white micas from blueschists blocks in serpentinite matrix melange from the exhumed Baja California subduction complex. Thermal history models yielded T-t paths suggesting that Ar-40* resides within multiple diffusion domains with varying Ar-40* retentivity. Modelled white mica thermal histories and thermobarometric data were used to forward model continuous P-T-t paths. P-T-t paths are consistent with previous studies and are interpreted to constrain blueschist block exhumation paths within the Baja accretionary wedge. Our P-T-t models use temperature controlled Ar-40/Ar-39 step heat data in which argon loss by volume diffusion can be demonstrated, and for which the white mica petrogenesis is known.
机译:白色云母是火炭和变质岩石中的主要岩石形成矿物质,它们的化学和同位素变化可用于确定压力,温度和时间(P-T-T)历史。 我们将AR-40 / AR-39多扩散域模型从Bluechite Matrix Melange的Blueschists块延伸到来自Baja California俯冲复合体的Blusinite Matrix Melange。 热历史模型产生了T-T路径,表明AR-40 *位于具有不同AR-40 *保持性的多个扩散域内。 模型的白色云母热历史和热磁化管数据用于转发模型连续P-T-T路径。 P-T-T路径与先前的研究一致,并被解释为限制Baja accreetionary楔子内的布鲁斯支路膨胀路径。 我们的P-T-T模型使用温度控制的AR-40 / AR-39步进热数据,其中可以证明由体积扩散的氩气损失,并且已知白云母细胞膜。

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