德国波西米亚地块西北部的一种新的蓝斑石斑晶后具有假形态的赛登白云岩

IF 2.2 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Terra Nova Pub Date : 2023-05-02 DOI:10.1111/ter.12659

H. Massonne

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引用次数: 0

摘要

Saidenbachite在超高压（UHP）下从熔体开始结晶。这种长英质火成岩在世界上只出现过两次。在Erzgebirge结晶杂岩中心的类型位置发现的新型赛登白云岩，其特征是在石榴石颗粒明显较小的基质中，含有毫米大小的粗粒石英聚集体，很少含有金刚石包裹体、斜长石、钾长石、白云母、一些深色云母、金红石和±蓝晶石。根据这些聚集体的形状和规则分布，显示出相似的大小，它们被解释为以前的柯石英斑晶，在长英质岩浆中早期生长。热力学模型证实了这一解释，表明共晶石是从富含SiO2（>66 wt%）岩浆。

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A new type of saidenbachite with pseudomorphs after coesite phenocrysts from the north‐western Bohemian Massif, Germany

Saidenbachite started to crystallize from melt under ultrahigh pressure (UHP). This felsic igneous rock is known from two occurrences in the world only. The here reported new type of saidenbachite, found at the type locality in the central Erzgebirge Crystalline Complex, is characterized by millimetre‐sized aggregates of coarse‐grained quartz in a matrix of significantly smaller grains of garnet, rarely containing diamond inclusions, plagioclase, K‐feldspar, white mica, some dark mica, rutile and ±kyanite. According to the shape and the regular distribution of these aggregates showing similar size, they are interpreted as former coesite phenocrysts, which grew early in a felsic magma. This interpretation is corroborated by thermodynamic modelling demonstrating that coesite is the first major phase that crystallizes from SiO2‐rich (>66 wt%) magmas at UHP.

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来源期刊

Terra Nova 地学-地球科学综合

CiteScore

4.80

自引率

8.30%

发文量

审稿时长

2.3 months

期刊介绍： Terra Nova publishes short, innovative and provocative papers of interest to a wide readership and covering the broadest spectrum of the Solid Earth and Planetary Sciences. Terra Nova encompasses geology, geophysics and geochemistry, and extends to the fluid envelopes (atmosphere, ocean, environment) whenever coupling with the Solid Earth is involved.