Trapiche Garnets in Chun’an, Zhejiang Province, China: New Constraints from Their Gemology, Geochemistry, and Geochronology
The trapiche garnet, a gemstone of unparalleled beauty, boasts a rare structure comprising one core, six radiating arms, and a main body. The occurrence of garnet within the trapiche structure elevates it beyond the species, granting it significant scientific and gemological value. In this study, we...
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2025-02-01
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| author | Yingzhao Wang Siyi Zhao Yi Zhao Zisheng Wang |
| author_facet | Yingzhao Wang Siyi Zhao Yi Zhao Zisheng Wang |
| author_sort | Yingzhao Wang |
| collection | DOAJ |
| description | The trapiche garnet, a gemstone of unparalleled beauty, boasts a rare structure comprising one core, six radiating arms, and a main body. The occurrence of garnet within the trapiche structure elevates it beyond the species, granting it significant scientific and gemological value. In this study, we conducted the first systematic investigation of trapiche garnets from the Chun’an area, Zhejiang Province, China. These samples were proven grossular through the analysis of spectroscopy and major elements. The trace element features are consistent with the distribution patterns of garnet in hydrothermal metasomatic skarn. Microscopic observation and Raman spectroscopy revealed that dark inclusions within the core and arms consist predominantly of amorphous carbon. The in situ U-Pb dating of the trapiche garnets revealed a crystallization age of 120.7 ± 4.7 Ma, corresponding to the late Yanshanian movement. It is speculated that the contact metasomatism between magma enriched in Al and surrounding rock led to the formation of calcareous skarn. This study provides insights into gemological, geochemical, and chronological characteristics, broadening the research on trapiche structures, and enhancing the understanding of gemstone mineralization timing and local tectonic activity. |
| format | Article |
| id | doaj-art-7f96a3c6fde64dd1a7d3cd04f89ed2bc |
| institution | DOAJ |
| issn | 2073-4352 |
| language | English |
| publishDate | 2025-02-01 |
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| series | Crystals |
| spelling | doaj-art-7f96a3c6fde64dd1a7d3cd04f89ed2bc2025-08-20T02:42:46ZengMDPI AGCrystals2073-43522025-02-0115320110.3390/cryst15030201Trapiche Garnets in Chun’an, Zhejiang Province, China: New Constraints from Their Gemology, Geochemistry, and GeochronologyYingzhao Wang0Siyi Zhao1Yi Zhao2Zisheng Wang3Shandong Institute of Geological Survey, Jinan 250014, ChinaSchool of Gemmology, China University of Geosciences, Beijing 100083, ChinaSchool of Gemmology, China University of Geosciences, Beijing 100083, ChinaNo.1 Institute of Geology and Mineral Resource Exploration of Shandong Province, Jinan 250100, ChinaThe trapiche garnet, a gemstone of unparalleled beauty, boasts a rare structure comprising one core, six radiating arms, and a main body. The occurrence of garnet within the trapiche structure elevates it beyond the species, granting it significant scientific and gemological value. In this study, we conducted the first systematic investigation of trapiche garnets from the Chun’an area, Zhejiang Province, China. These samples were proven grossular through the analysis of spectroscopy and major elements. The trace element features are consistent with the distribution patterns of garnet in hydrothermal metasomatic skarn. Microscopic observation and Raman spectroscopy revealed that dark inclusions within the core and arms consist predominantly of amorphous carbon. The in situ U-Pb dating of the trapiche garnets revealed a crystallization age of 120.7 ± 4.7 Ma, corresponding to the late Yanshanian movement. It is speculated that the contact metasomatism between magma enriched in Al and surrounding rock led to the formation of calcareous skarn. This study provides insights into gemological, geochemical, and chronological characteristics, broadening the research on trapiche structures, and enhancing the understanding of gemstone mineralization timing and local tectonic activity.https://www.mdpi.com/2073-4352/15/3/201garnettrapichechemical compositionsU–Pb dating |
| spellingShingle | Yingzhao Wang Siyi Zhao Yi Zhao Zisheng Wang Trapiche Garnets in Chun’an, Zhejiang Province, China: New Constraints from Their Gemology, Geochemistry, and Geochronology Crystals garnet trapiche chemical compositions U–Pb dating |
| title | Trapiche Garnets in Chun’an, Zhejiang Province, China: New Constraints from Their Gemology, Geochemistry, and Geochronology |
| title_full | Trapiche Garnets in Chun’an, Zhejiang Province, China: New Constraints from Their Gemology, Geochemistry, and Geochronology |
| title_fullStr | Trapiche Garnets in Chun’an, Zhejiang Province, China: New Constraints from Their Gemology, Geochemistry, and Geochronology |
| title_full_unstemmed | Trapiche Garnets in Chun’an, Zhejiang Province, China: New Constraints from Their Gemology, Geochemistry, and Geochronology |
| title_short | Trapiche Garnets in Chun’an, Zhejiang Province, China: New Constraints from Their Gemology, Geochemistry, and Geochronology |
| title_sort | trapiche garnets in chun an zhejiang province china new constraints from their gemology geochemistry and geochronology |
| topic | garnet trapiche chemical compositions U–Pb dating |
| url | https://www.mdpi.com/2073-4352/15/3/201 |
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