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| DOI | 10.3390/min14050473 |
| Petrogenesis and Tectonic Setting of the Baluogenguole Mafic Dykes, Zongwulong Belt: Implications for Evolution of the Northern East Paleo-Tethys Ocean | |
| 发表日期 | 2024 |
| EISSN | 2075-163X |
| 起始页码 | 14 |
| 结束页码 | 5 |
| 卷号 | 14期号:5 |
| 英文摘要 | The late Paleozoic tectonic setting of the Zongwulong Belt (ZWLB), a significant unit located in the northern Qaidam margin, Qinghai province, remains uncertain. Diabase dykes in the western part of the Zongwulong Belt offer insights into this issue. Field investigations reveal that the dips of the dykes are almost vertical, and they have sharp boundaries with the host rocks. These dykes consist of plagioclase, clinopyroxene, and opaque minerals exhibiting a characteristic porphyritic texture and massive structure. Zircon U-Pb dating of the dykes yields a weighted 206Pb/238U age of 289 +/- 1 Ma. The dykes exhibit relatively high concentrations of TFeO, K2O + Na2O, and TiO2, while the SiO2 and MgO concentrations are relatively low. They display relative light-over-heavy REE enrichment, and lack negative Nb-Ta and Eu anomalies. The dykes underwent negligible crustal contamination, and experienced extensive fractional crystallization of olivine, clinopyroxene, and Fe-Ti oxides. Originating from the spinel-garnet transition zone at depths of approximately 75 km, the dykes result from garnet facies low-degree melting (5%-10%) in a continental rift setting. Combining these findings with regional geological data, we propose that the ZWLB likely experienced a continental rift in the west and exhibited a narrow oceanic environment in the east in the late Paleozoic period, potentially representing the most distant north branch of the East Paleo-Tethys Ocean. |
| 英文关键词 | Baluogenguole mafic dykes; geochemistry; late Paleozoic; East Paleo-Tethys Ocean; Zongwulong Belt |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing |
| WOS类目 | Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing |
| WOS记录号 | WOS:001231620300001 |
| 来源期刊 | MINERALS
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/298704 |
| 作者单位 | Qinghai University; China Geological Survey |
| 推荐引用方式 GB/T 7714 | . Petrogenesis and Tectonic Setting of the Baluogenguole Mafic Dykes, Zongwulong Belt: Implications for Evolution of the Northern East Paleo-Tethys Ocean[J],2024,14(5). |
| APA | (2024).Petrogenesis and Tectonic Setting of the Baluogenguole Mafic Dykes, Zongwulong Belt: Implications for Evolution of the Northern East Paleo-Tethys Ocean.MINERALS,14(5). |
| MLA | "Petrogenesis and Tectonic Setting of the Baluogenguole Mafic Dykes, Zongwulong Belt: Implications for Evolution of the Northern East Paleo-Tethys Ocean".MINERALS 14.5(2024). |
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