Early Cretaceous rift-related volcanism in the Songliao Basin, NE China: a geochemical study
Following the amalgamation of the Siberian and North China Cratons, NE China, as part of the Central Asian Orogenic Belt (CAOB), underwent Late Mesozoic lithospheric extension that was associated with volcanic activity. The Songliao Basin is the most important rift structure formed during these proc...
Gespeichert in:
| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2019
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| In: |
International geology review
Year: 2017, Jahrgang: 61, Heft: 1, Pages: 39-55 |
| ISSN: | 1938-2839 |
| DOI: | 10.1080/00206814.2017.1395300 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1080/00206814.2017.1395300
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| Verfasserangaben: | Shuang-Qing Li, Yan Wang, Bo-Wen Fang, Jian-Feng He, Fukun Chen, Wolfgang Siebel |
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| 245 | 1 | 0 | |a Early Cretaceous rift-related volcanism in the Songliao Basin, NE China |b a geochemical study |c Shuang-Qing Li, Yan Wang, Bo-Wen Fang, Jian-Feng He, Fukun Chen, Wolfgang Siebel |
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| 520 | |a Following the amalgamation of the Siberian and North China Cratons, NE China, as part of the Central Asian Orogenic Belt (CAOB), underwent Late Mesozoic lithospheric extension that was associated with volcanic activity. The Songliao Basin is the most important rift structure formed during these processes and contains voluminous volcanic rocks interlayered with sedimentary infill. Mafic-to-intermediate lavas are associated with felsic ones. This study focusses on the geochemical compositions of the less-widespread Early Cretaceous mafic-to-intermediate lavas in the Songliao Basin and compares them with the more abundant felsic rocks. Two mafic-to-intermediate magma series, one with alkaline and the other with sub-alkaline affinity, were identified. High MgO and Cr contents, low Th/Nb and La/Nb ratios, and variable but depleted Nd isotope compositions indicate that both magma suites were most likely formed by the melting of enriched upper mantle sources. Sub-alkaline mafic-to-intermediate rocks and I-type rhyolites define a co-genetic magma series. This rock suite was produced by the melting of subduction-modified lithospheric mantle and subsequent magma evolution as well as crustal melting during lithospheric extension. Alkaline mafic-to-intermediate rocks and A-type rhyolites form another co-genetic magma suite that was produced under within-plate conditions from an OIB-type mantle source, supposed to be the heterogeneous shallow asthenosphere and/or the lower lithosphere. Decompression partial melting of this mantle source requires a relatively thin lithosphere. The development of alkaline mafic rocks and A-type rhyolites as typical bimodal volcanic assemblage reflects that lithospheric thinning below the Songliao Basin reached its maximum, whereas basin rifting terminated afterwards. | ||
| 534 | |c 2017 | ||
| 650 | 4 | |a bimodal volcanism | |
| 650 | 4 | |a lithospheric extension | |
| 650 | 4 | |a Mafic-to-intermediate rocks | |
| 650 | 4 | |a Songliao Basin | |
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