Newly detected shock-induced high-pressure phases formed in amphibolite clasts of the suevite breccia (Ries impact crater, Germany): liebermannite, kokchetavite, and other ultrahigh-pressure phases
Amphibolite clasts in the suevite of the Ries impact crater contain shock-induced melt veins (SMVs) with high-pressure phases such as majoritic garnet, jadeitic clinopyroxene and others. In addition, heat conduction from hot SMVs into adjacent rock portions locally produced further high P-T melt poo...
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| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
02 August 2022
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| In: |
Contributions to mineralogy and petrology
Year: 2022, Jahrgang: 177, Heft: 8, Pages: 1-27 |
| ISSN: | 1432-0967 |
| DOI: | 10.1007/s00410-022-01936-3 |
| Online-Zugang: | Resolving-System, kostenfrei, Volltext: https://doi.org/10.1007/s00410-022-01936-3 Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1007/s00410-022-01936-3 
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| Verfasserangaben: | Volker Stähle, Chutimun Chanmuang N., Winfried H. Schwarz, Mario Trieloff, Alexander Varychev |
MARC
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| 245 | 1 | 0 | |a Newly detected shock-induced high-pressure phases formed in amphibolite clasts of the suevite breccia (Ries impact crater, Germany) |b liebermannite, kokchetavite, and other ultrahigh-pressure phases |c Volker Stähle, Chutimun Chanmuang N., Winfried H. Schwarz, Mario Trieloff, Alexander Varychev |
| 264 | 1 | |c 02 August 2022 | |
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| 520 | |a Amphibolite clasts in the suevite of the Ries impact crater contain shock-induced melt veins (SMVs) with high-pressure phases such as majoritic garnet, jadeitic clinopyroxene and others. In addition, heat conduction from hot SMVs into adjacent rock portions locally produced further high P-T melt pools. These melts were preferentially generated in rock domains, where the SMVs cross older (‘pre-Ries’) veinlets with analcime or prehnite and larger grains of sericitized plagioclase. Melting of such chemically different local bulk systems (Na-, Ca-, Ca-Na- and K-Na-rich) was facilitated by low solidus temperatures of the original secondary OH-bearing phases. From the resulting shock-induced melts, liebermannite, kokchetavite, jadeite, nonstoichiometric and albitic jadeite, grossular, vuagnatite, lawsonite + coesite, and clinozoisite crystallized during pressure release. Vuagnatite is now proven to be a genuine high-pressure phase. Its ubiquitous distance of 20-35 μm from the hot shock veins suggests a temperature sensitivity typical for an OH-bearing phase. In local Na-rich melts albitic jadeite appears instead of the assemblage jadeite + SiO2. Liebermannite, a dense polymorph of K-feldspar was identified by Raman spectroscopy. After stishovite, liebermannite constitutes the second known high-pressure phase in the Ries that contains silicon exclusively in six-fold coordination. The KAlSi3O8-polymorph kokchetavite was formed in alkali-rich melt glasses. Pressure and temperature values in the range of about 8-11 GPa and ~ 800-1100 °C were estimated from the chemical compositions of locally occurring majoritic garnets (Si = 3.21-3.32 and 3.06-3.10 apfu), respectively, and the presence of fine-grained aggregates of lawsonite and coesite. Generally, the neighboring areas of the veins are characterized by a sequence of variable high-pressure phases documenting strongly falling P-T conditions with increasing distance from the vein. These novel features enlighten the dynamic event during passage of a shock wave. | ||
| 650 | 4 | |a Jadeite | |
| 650 | 4 | |a Kokchetavite | |
| 650 | 4 | |a Lawsonite | |
| 650 | 4 | |a Liebermannite | |
| 650 | 4 | |a Ries impact crater | |
| 650 | 4 | |a Shock vein | |
| 650 | 4 | |a Vuagnatite | |
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| 700 | 1 | |a Varychev, Alexander |e VerfasserIn |0 (DE-588)1164195395 |0 (DE-627)1028660650 |0 (DE-576)508435536 |4 aut | |
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