加拿大苏必利尔省西北部的太古宙超高温事件:皮克韦泰麻粒岩域的变质演化和构造意义

IF 3.5 2区 地球科学 Q1 GEOLOGY
Changqing Yin, Xiaoman Wang, Shoufa Lin, Chris G. Couëslan, Christian O. Böhm, Jiahui Qian, Jian Zhang, Yanfei Xia, Wenxuan Li
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引用次数: 0

摘要

皮克维托内麻粒岩域(PGD)位于苏必利尔省西北部,是世界上最大的新太古代高级变质域之一,是了解苏必利勒省新太古代地壳演化的关键。本文报道了用蓝宝石研究超高温麻粒岩的结果 + PGD中Sipiwesk湖地区的含石英峰组合。根据岩相观察,变质组合发育有三个阶段:峰前阶段以蓝宝石和斜方辉石中的石榴石、硅线石、钾长石和黑云母包裹体为标志。峰值阶段的特征是典型的蓝宝石超高温缔合 + 石英和蓝宝石 + 斜方辉石。逆行阶段表现为基质中堇青石、黑云母和硅线石的逆行形成。基于含蓝宝石麻粒岩整体成分的相平衡模型表明,岩石在7.9–9.0的压力下经历了超过1035°C的拉伸超高温变质作用 kbar,然后进行等压冷却过程。蓝宝石麻粒岩中变质锆石的SHRIMP U–Pb定年记录了PGD中UHT事件的时间,加权平均207Pb/206Pb年龄为2681 ± 13 马。这项研究结合其他变质P–T路径和年龄信息表明,这种超高温变质作用发生在2.68 PGD中的Ga是由苏必利尔省合并过程中板块碰撞断裂导致的软流圈上升产生的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Archean ultrahigh temperature event in the northwestern Superior Province, Canada: Metamorphic evolution and tectonic implications of the Pikwitonei Granulite Domain

The Pikwitonei Granulite Domain (PGD), located in the northwestern Superior Province, is one of the largest Neoarchean high-grade metamorphic domains in the world, and is a key to understanding the Neoarchean crustal evolution of the Superior Province. Here we report results of a study on ultrahigh temperature (UHT) granulites with a sapphirine + quartz-bearing peak assemblage from the Sipiwesk Lake area in the PGD. Three stages of metamorphic assemblage development are recognized based on petrographic observations: Pre-peak stage is marked by garnet, sillimanite, K-feldspar, and biotite inclusions within sapphirine and orthopyroxene. Peak stage is charactered by the typical UHT associations of sapphirine + quartz and sapphirine + orthopyroxene. The retrograde stage is represented by the retrograde formation of cordierite, biotite and sillimanite in the matrix. Phase equilibrium modelling based on the bulk compositions of sapphirine-bearing granulites suggest that the rocks have experienced extensional UHT metamorphism in excess of 1035°C at pressures of 7.9–9.0 kbar, followed by isobaric cooling process. SHRIMP U–Pb dating of metamorphic zircons in sapphirine-bearing granulite record the timing of the UHT event in the PGD with a weighted mean 207Pb/206Pb age of 2681 ± 13 Ma. This study in combination with other metamorphic P–T paths and age information reveals that this UHT metamorphism at 2.68 Ga in PGD was generated by upwelling asthenosphere due to slab break-off in collision during the amalgamation of the Superior Province.

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来源期刊
CiteScore
6.60
自引率
11.80%
发文量
57
审稿时长
6-12 weeks
期刊介绍: The journal, which is published nine times a year, encompasses the entire range of metamorphic studies, from the scale of the individual crystal to that of lithospheric plates, including regional studies of metamorphic terranes, modelling of metamorphic processes, microstructural and deformation studies in relation to metamorphism, geochronology and geochemistry in metamorphic systems, the experimental study of metamorphic reactions, properties of metamorphic minerals and rocks and the economic aspects of metamorphic terranes.
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