阿巴拉契亚山脉北部Belvidere山杂岩中最新发现的蓝片岩相变质作用（海蓝绿辉石-石榴石）

IF 1.7 3区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Geosphere Pub Date : 2023-03-09 DOI:10.1130/ges02582.1

I. Honsberger

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引用次数: 2

摘要

美国新英格兰西北部新近发现阿巴拉契亚造山带蓝片岩相变质作用。在佛蒙特州Belvidere山杂岩的退化石榴石-大理岩-角闪岩的残余石榴石岩芯中，存在海绿石和绿辉石的包裹体。压力-温度假剖面和矿物成分等值线计算表明，Belvidere Mountain杂岩蓝片岩相矿物组合，包括海绿石-镁角闪石-绿辉石-绿泥石-金红石-石英-斜帘石-石榴石，在约1.65–2.0 GPa和约450–480°C下稳定。斜帘石中不含石榴石的角闪岩，含大理岩和绿泥石包裹体，记录了在约1.0–1.4 GPa和约515–550°C下的高压绿帘石-角闪岩相变质作用。这些新发现量化了寒武纪至奥陶纪Taconic造山循环期间Belvidere山杂岩的深度俯冲，并表明通过对退化岩石的详细分析，可以在阿巴拉契亚山脉揭示更多的蓝片岩相矿物组合。

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Newly recognized blueschist-facies metamorphism (glaucophane-omphacite-garnet), Belvidere Mountain Complex, northern Appalachians

An occurrence of blueschist-facies metamorphism in the Appalachian orogen is newly recognized in northwestern New England, United States. Inclusions of glaucophane and omphacite occur in a relict garnet core from a retrogressed garnet-barroisite amphibolite of the Belvidere Mountain Complex in Vermont. Pressure-temperature pseudosection and mineral composition isopleth calculations demonstrate that the Belvidere Mountain Complex blueschist-facies mineral assemblage of glaucophane–magnesio-hornblende–omphacite–chlorite–rutile–quartz–clinozoisite–garnet was stable at ~1.65–2.0 GPa and ~450–480 °C. Garnet-absent amphibolite with barroisite and chlorite inclusions in clinozoisite records high-pressure epidote-amphibolite–facies metamorphism at ~1.0–1.4 GPa and ~515–550 °C. These new findings quantify deep subduction of the Belvidere Mountain Complex during the Cambrian to Ordovician Taconic orogenic cycle and suggest that more blueschist-facies mineral assemblages could be revealed in the Appalachians with detailed analysis of retrogressed rocks.

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来源期刊

Geosphere 地学-地球科学综合

CiteScore

4.40

自引率

12.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Geosphere is GSA''s ambitious, online-only publication that addresses the growing need for timely publication of research results, data, software, and educational developments in ways that cannot be addressed by traditional formats. The journal''s rigorously peer-reviewed, high-quality research papers target an international audience in all geoscience fields. Its innovative format encourages extensive use of color, animations, interactivity, and oversize figures (maps, cross sections, etc.), and provides easy access to resources such as GIS databases, data archives, and modeling results. Geosphere''s broad scope and variety of contributions is a refreshing addition to traditional journals.