WANG, XIAOXIA, WANG, TAO, JAHN, BOR-MING, HU, NENGGAO, CHEN, WEN (2007) Tectonic significance of Late Triassic post-collisional lamprophyre dykes from the Qinling Mountains (China) Geological Magazine, 144 (5) 837-848 doi:10.1017/s0016756807003548
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Tectonic significance of Late Triassic post-collisional lamprophyre dykes from the Qinling Mountains (China) | ||
| Journal | Geological Magazine | ||
| Authors | WANG, XIAOXIA | Author | |
| WANG, TAO | Author | ||
| JAHN, BOR-MING | Author | ||
| HU, NENGGAO | Author | ||
| CHEN, WEN | Author | ||
| Year | 2007 (September) | Volume | 144 |
| Issue | 5 | ||
| Publisher | Cambridge University Press (CUP) | ||
| DOI | doi:10.1017/s0016756807003548Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 260081 | Long-form Identifier | mindat:1:5:260081:3 |
| GUID | 0 | ||
| Full Reference | WANG, XIAOXIA, WANG, TAO, JAHN, BOR-MING, HU, NENGGAO, CHEN, WEN (2007) Tectonic significance of Late Triassic post-collisional lamprophyre dykes from the Qinling Mountains (China) Geological Magazine, 144 (5) 837-848 doi:10.1017/s0016756807003548 | ||
| Plain Text | WANG, XIAOXIA, WANG, TAO, JAHN, BOR-MING, HU, NENGGAO, CHEN, WEN (2007) Tectonic significance of Late Triassic post-collisional lamprophyre dykes from the Qinling Mountains (China) Geological Magazine, 144 (5) 837-848 doi:10.1017/s0016756807003548 | ||
| In | (2007, September) Geological Magazine Vol. 144 (5) Cambridge University Press (CUP) | ||
| Abstract/Notes | The QinlingāDabie orogen in central China is one of the major orogenic belts in East Asia. In the eastern DabieāSulu region, mafic lamprophyres show the enriched signatures of old sub-continental lithospheric mantle. However, little is known about the mafic igneous rocks and their lithospheric mantle sources in the western Qinling Range. New 40Arā39Ar age dating, major- and trace-element data, and isotopic analyses of Qinling lamprophyres reveal their differences from the Dabie Sulu lamprophyres. Biotite 40Arā39Ar dating yielded a plateau age of 219Ā±2 Ma, identical to the ages of rapakivi-textured granitoids in the area. The association of lamprophyre dykes and rapakivi-textured granitoids indicates that the Qinling region was a post-collisional setting at c. 220 Ma. The Qinling lamprophyres are calc-alkaline, and rich in large ion lithophile elements (e.g. Ba, K), but depleted in Nb, Ta and Ti. They show highly fractionated REE patterns with LaN>100 and HREE <10 times chondrite abundances. ĪµNd (219 Ma) values range from ā0.5 to ā3.3 and initial Sr isotope values from 0.7036 to 0.7058. These features suggest generation of the lamprophyre by partial melting of a metasomatized, garnet peridotite mantle source. The Qinling lamprophyres are distinct from the DabieāSulu lamprophyres in emplacement age (c. 135 Ma for DabieāSulu) and isotopic composition, suggesting that the nature of the lithospheric mantle and geodynamic evolution of the Qinling region contrasts with that of the DabieāSulu region. | ||
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