Neoproterozoic ultramafic-mafic-carbonatite complex and granitoids in Quruqtagh of northeastern Tarim Block, western China: Geochronology, geochemistry and tectonic implications
U–Pb zircon and baddeleyite ages, and geochemical and Nd isotopic data, are reported for a ultramafic–mafic-carbonatite complex and granites in Quruqtagh of northeastern Tarim Block, NW China. The carbonatite and plagioclase-bearing pyroxenite from the Qiganbulake mafic–ultramafic-carbonatite ring c...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
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Elsevier Science BV
2007
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| Online Access: | http://hdl.handle.net/20.500.11937/18547 |
| _version_ | 1848749775167422464 |
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| author | Zhang, C. Li, X. Li, Zheng-Xiang Lu, S. Ye, H. Li, H. |
| author_facet | Zhang, C. Li, X. Li, Zheng-Xiang Lu, S. Ye, H. Li, H. |
| author_sort | Zhang, C. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | U–Pb zircon and baddeleyite ages, and geochemical and Nd isotopic data, are reported for a ultramafic–mafic-carbonatite complex and granites in Quruqtagh of northeastern Tarim Block, NW China. The carbonatite and plagioclase-bearing pyroxenite from the Qiganbulake mafic–ultramafic-carbonatite ring complex (QMC), the Xingdi granodiorite and the Taiyangdao granite were emplaced at 810±6, 818±11, 820±10 and 795±10 Ma (95% confidence level), respectively. The QMC is composed of dunite, apatiteand/or feldspar-bearing pyroxenite, pyroxenite, phlogopitelite and carbonatite. Petrography, geochemistry and mineral chemistry suggest that the QMC rocks were generated by partial melting of a CO2-metasomatized mantle in a rifting environment. The Xingdi and Taiyangdao granitoids possess high LREE, Na2O/K2O, Sr/Y, (La/Yb)N ratios and low HREE and HFSE contents, similar to modern adakites. However, they have lower MgO (or Mg#), Cr and Ni contents and unradiogenic Nd isotopes (pronounced negative eNd(t) value of -12.7 to -17.3 and Neoarchaean Nd model ages) than slab-derived adakites. Thus, they were likely formed by partial melting of Neoarchaean mafic protoliths in the lower crust, leaving behind a granulite residue. The QMC and the granitoids in Quruqtagh constitute a bimodal intrusive suite in a Neoproterozoic continental rift setting, possibly related to mantle plume activities beneath the Rodinian supercontinent. |
| first_indexed | 2025-11-14T07:26:17Z |
| format | Journal Article |
| id | curtin-20.500.11937-18547 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:26:17Z |
| publishDate | 2007 |
| publisher | Elsevier Science BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-185472017-09-13T13:46:02Z Neoproterozoic ultramafic-mafic-carbonatite complex and granitoids in Quruqtagh of northeastern Tarim Block, western China: Geochronology, geochemistry and tectonic implications Zhang, C. Li, X. Li, Zheng-Xiang Lu, S. Ye, H. Li, H. NW China Geochemistry Rodinia Granitoids Ultramafic–mafic-carbonatite complex Geochronology Tarim Block U–Pb zircon and baddeleyite ages, and geochemical and Nd isotopic data, are reported for a ultramafic–mafic-carbonatite complex and granites in Quruqtagh of northeastern Tarim Block, NW China. The carbonatite and plagioclase-bearing pyroxenite from the Qiganbulake mafic–ultramafic-carbonatite ring complex (QMC), the Xingdi granodiorite and the Taiyangdao granite were emplaced at 810±6, 818±11, 820±10 and 795±10 Ma (95% confidence level), respectively. The QMC is composed of dunite, apatiteand/or feldspar-bearing pyroxenite, pyroxenite, phlogopitelite and carbonatite. Petrography, geochemistry and mineral chemistry suggest that the QMC rocks were generated by partial melting of a CO2-metasomatized mantle in a rifting environment. The Xingdi and Taiyangdao granitoids possess high LREE, Na2O/K2O, Sr/Y, (La/Yb)N ratios and low HREE and HFSE contents, similar to modern adakites. However, they have lower MgO (or Mg#), Cr and Ni contents and unradiogenic Nd isotopes (pronounced negative eNd(t) value of -12.7 to -17.3 and Neoarchaean Nd model ages) than slab-derived adakites. Thus, they were likely formed by partial melting of Neoarchaean mafic protoliths in the lower crust, leaving behind a granulite residue. The QMC and the granitoids in Quruqtagh constitute a bimodal intrusive suite in a Neoproterozoic continental rift setting, possibly related to mantle plume activities beneath the Rodinian supercontinent. 2007 Journal Article http://hdl.handle.net/20.500.11937/18547 10.1016/j.precamres.2006.11.003 Elsevier Science BV restricted |
| spellingShingle | NW China Geochemistry Rodinia Granitoids Ultramafic–mafic-carbonatite complex Geochronology Tarim Block Zhang, C. Li, X. Li, Zheng-Xiang Lu, S. Ye, H. Li, H. Neoproterozoic ultramafic-mafic-carbonatite complex and granitoids in Quruqtagh of northeastern Tarim Block, western China: Geochronology, geochemistry and tectonic implications |
| title | Neoproterozoic ultramafic-mafic-carbonatite complex and granitoids in Quruqtagh of northeastern Tarim Block, western China: Geochronology, geochemistry and tectonic implications |
| title_full | Neoproterozoic ultramafic-mafic-carbonatite complex and granitoids in Quruqtagh of northeastern Tarim Block, western China: Geochronology, geochemistry and tectonic implications |
| title_fullStr | Neoproterozoic ultramafic-mafic-carbonatite complex and granitoids in Quruqtagh of northeastern Tarim Block, western China: Geochronology, geochemistry and tectonic implications |
| title_full_unstemmed | Neoproterozoic ultramafic-mafic-carbonatite complex and granitoids in Quruqtagh of northeastern Tarim Block, western China: Geochronology, geochemistry and tectonic implications |
| title_short | Neoproterozoic ultramafic-mafic-carbonatite complex and granitoids in Quruqtagh of northeastern Tarim Block, western China: Geochronology, geochemistry and tectonic implications |
| title_sort | neoproterozoic ultramafic-mafic-carbonatite complex and granitoids in quruqtagh of northeastern tarim block, western china: geochronology, geochemistry and tectonic implications |
| topic | NW China Geochemistry Rodinia Granitoids Ultramafic–mafic-carbonatite complex Geochronology Tarim Block |
| url | http://hdl.handle.net/20.500.11937/18547 |