Petrogenesis and tectonic significance of mafic–ultramafic rocks from Southwest Yunnan, China
This study focuses on the mafic–ultramafic lavas of the Early Carboniferous outcrop in Mangxin, southwestern Yunnan, China. Picrites with 26–32 wt% MgO and a quenched texture are the most significant components of this rock association. This article divides the Mangxin picrites into two types. The m...
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| Format: | Article |
| Language: | English |
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Académie des sciences
2020-11-01
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| Series: | Comptes Rendus. Géoscience |
| Subjects: | |
| Online Access: | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.15/ |
| _version_ | 1797651329638727680 |
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| author | Shi, Qing Fang, Nianqiao |
| author_facet | Shi, Qing Fang, Nianqiao |
| author_sort | Shi, Qing |
| collection | DOAJ |
| description | This study focuses on the mafic–ultramafic lavas of the Early Carboniferous outcrop in Mangxin, southwestern Yunnan, China. Picrites with 26–32 wt% MgO and a quenched texture are the most significant components of this rock association. This article divides the Mangxin picrites into two types. The mantle potential temperature ($T_{{p}}$) of these picrites is higher than the $T_{{p}}$ range of mid-ocean ridges and reaches that of mantle plumes. According to the geochemical characteristics, the Type-1 picrites probably formed from the melting of the mantle plume head and were contaminated by ambient depleted mantle, whereas the Type-2 picrites formed from the melting of mantle plume tails. These plume-related mafic–ultramafic rocks in Mangxin and the ocean island basalt (OIB)-carbonate rock associations in many areas of the Changning–Menglian belt provide significant evidence for the improvement of previous models of the Palaeotethyan oceanic plateau. |
| first_indexed | 2024-03-11T16:14:26Z |
| format | Article |
| id | doaj.art-a5c873421dd445d88ee7937301630fbf |
| institution | Directory Open Access Journal |
| issn | 1778-7025 |
| language | English |
| last_indexed | 2024-03-11T16:14:26Z |
| publishDate | 2020-11-01 |
| publisher | Académie des sciences |
| record_format | Article |
| series | Comptes Rendus. Géoscience |
| spelling | doaj.art-a5c873421dd445d88ee7937301630fbf2023-10-24T14:24:02ZengAcadémie des sciencesComptes Rendus. Géoscience1778-70252020-11-01352858959910.5802/crgeos.1510.5802/crgeos.15Petrogenesis and tectonic significance of mafic–ultramafic rocks from Southwest Yunnan, ChinaShi, Qing0Fang, Nianqiao1China University of Geosciences (Beijing), No.29 Xueyuan Road, 100083, Beijing, P.R. ChinaChina University of Geosciences (Beijing), No.29 Xueyuan Road, 100083, Beijing, P.R. ChinaThis study focuses on the mafic–ultramafic lavas of the Early Carboniferous outcrop in Mangxin, southwestern Yunnan, China. Picrites with 26–32 wt% MgO and a quenched texture are the most significant components of this rock association. This article divides the Mangxin picrites into two types. The mantle potential temperature ($T_{{p}}$) of these picrites is higher than the $T_{{p}}$ range of mid-ocean ridges and reaches that of mantle plumes. According to the geochemical characteristics, the Type-1 picrites probably formed from the melting of the mantle plume head and were contaminated by ambient depleted mantle, whereas the Type-2 picrites formed from the melting of mantle plume tails. These plume-related mafic–ultramafic rocks in Mangxin and the ocean island basalt (OIB)-carbonate rock associations in many areas of the Changning–Menglian belt provide significant evidence for the improvement of previous models of the Palaeotethyan oceanic plateau.https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.15/PicriteMantle plumeMantle potential temperatureOceanic plateauPalaeotethys |
| spellingShingle | Shi, Qing Fang, Nianqiao Petrogenesis and tectonic significance of mafic–ultramafic rocks from Southwest Yunnan, China Comptes Rendus. Géoscience Picrite Mantle plume Mantle potential temperature Oceanic plateau Palaeotethys |
| title | Petrogenesis and tectonic significance of mafic–ultramafic rocks from Southwest Yunnan, China |
| title_full | Petrogenesis and tectonic significance of mafic–ultramafic rocks from Southwest Yunnan, China |
| title_fullStr | Petrogenesis and tectonic significance of mafic–ultramafic rocks from Southwest Yunnan, China |
| title_full_unstemmed | Petrogenesis and tectonic significance of mafic–ultramafic rocks from Southwest Yunnan, China |
| title_short | Petrogenesis and tectonic significance of mafic–ultramafic rocks from Southwest Yunnan, China |
| title_sort | petrogenesis and tectonic significance of mafic ultramafic rocks from southwest yunnan china |
| topic | Picrite Mantle plume Mantle potential temperature Oceanic plateau Palaeotethys |
| url | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.15/ |
| work_keys_str_mv | AT shiqing petrogenesisandtectonicsignificanceofmaficultramaficrocksfromsouthwestyunnanchina AT fangnianqiao petrogenesisandtectonicsignificanceofmaficultramaficrocksfromsouthwestyunnanchina |