Low‐δ18O Rhyolites From the Malani Igneous Suite: A Positive Test for South China and NW India Linkage in Rodinia
The Malani igneous suite (MIS) in NW India represents one of the best preserved silicic large igneous provinces. Voluminous silicic lavas of the MIS erupted between ~780–750 Ma. Zircon grains from rhyolite and dacite lavas have oxygen isotopic compositions that include depleted (δ18O = 4.12 to −1.11...
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Published in | Geophysical research letters Vol. 44; no. 20; pp. 10,298 - 10,305 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
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Washington
John Wiley & Sons, Inc
28.10.2017
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ISSN | 0094-8276 1944-8007 |
DOI | 10.1002/2017GL074717 |
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Abstract | The Malani igneous suite (MIS) in NW India represents one of the best preserved silicic large igneous provinces. Voluminous silicic lavas of the MIS erupted between ~780–750 Ma. Zircon grains from rhyolite and dacite lavas have oxygen isotopic compositions that include depleted (δ18O = 4.12 to −1.11‰) and enriched (δ18O = 8.23–5.12‰) signatures. The low‐δ18O zircon grains have highly radiogenic Hf isotopic compositions (ƐHf(t) = +13.0 to +3.6), suggesting high‐temperature bulk cannibalization of upper level juvenile mafic crust as an essential mechanism to produce the low‐δ18O felsic magma. Xenocrystic zircon grains in dacites have high δ18O and low ƐHf(t) values for magmas older than 800 Ma, reflecting a dramatic transition in tectono‐thermal regime in NW India during 800–780 Ma. A synchronous transition also occurred in south China and Madagascar, suggesting a spatially linked geodynamic system. NW India and south China together with Madagascar and the Seychelles lay either along the periphery of Rodinia or outboards of the supercontinent with the age of convergent plate margin magmatism coinciding with breakup of the supercontinent.
Key Points
δ18O depleted rhyolite from the Malani Igneous Suites (MIS) in NW India
Significant shift from magmatism with mantle‐like δ18O‐ƐHf(t) values to low 18O but juvenile magmatism at 800–780 Ma
Similar tectono‐thermal transition occurred in NW India, south China, and Madagascar at 800–780 Ma |
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AbstractList | The Malani igneous suite (MIS) in NW India represents one of the best preserved silicic large igneous provinces. Voluminous silicic lavas of the MIS erupted between ~780–750 Ma. Zircon grains from rhyolite and dacite lavas have oxygen isotopic compositions that include depleted (δ18O = 4.12 to −1.11‰) and enriched (δ18O = 8.23–5.12‰) signatures. The low‐δ18O zircon grains have highly radiogenic Hf isotopic compositions (ƐHf(t) = +13.0 to +3.6), suggesting high‐temperature bulk cannibalization of upper level juvenile mafic crust as an essential mechanism to produce the low‐δ18O felsic magma. Xenocrystic zircon grains in dacites have high δ18O and low ƐHf(t) values for magmas older than 800 Ma, reflecting a dramatic transition in tectono‐thermal regime in NW India during 800–780 Ma. A synchronous transition also occurred in south China and Madagascar, suggesting a spatially linked geodynamic system. NW India and south China together with Madagascar and the Seychelles lay either along the periphery of Rodinia or outboards of the supercontinent with the age of convergent plate margin magmatism coinciding with breakup of the supercontinent. The Malani igneous suite (MIS) in NW India represents one of the best preserved silicic large igneous provinces. Voluminous silicic lavas of the MIS erupted between ~780–750 Ma. Zircon grains from rhyolite and dacite lavas have oxygen isotopic compositions that include depleted (δ18O = 4.12 to −1.11‰) and enriched (δ18O = 8.23–5.12‰) signatures. The low‐δ18O zircon grains have highly radiogenic Hf isotopic compositions (ƐHf(t) = +13.0 to +3.6), suggesting high‐temperature bulk cannibalization of upper level juvenile mafic crust as an essential mechanism to produce the low‐δ18O felsic magma. Xenocrystic zircon grains in dacites have high δ18O and low ƐHf(t) values for magmas older than 800 Ma, reflecting a dramatic transition in tectono‐thermal regime in NW India during 800–780 Ma. A synchronous transition also occurred in south China and Madagascar, suggesting a spatially linked geodynamic system. NW India and south China together with Madagascar and the Seychelles lay either along the periphery of Rodinia or outboards of the supercontinent with the age of convergent plate margin magmatism coinciding with breakup of the supercontinent. Key Points δ18O depleted rhyolite from the Malani Igneous Suites (MIS) in NW India Significant shift from magmatism with mantle‐like δ18O‐ƐHf(t) values to low 18O but juvenile magmatism at 800–780 Ma Similar tectono‐thermal transition occurred in NW India, south China, and Madagascar at 800–780 Ma |
Author | Xia, Xiao‐Ping Pandit, Manoj K. Cawood, Peter A. Wang, Wei Zhou, Mei‐Fu Zhao, Jun‐Hong |
Author_xml | – sequence: 1 givenname: Wei orcidid: 0000-0002-7944-7598 surname: Wang fullname: Wang, Wei email: wwz@cug.edu.cn organization: University of Hong Kong – sequence: 2 givenname: Peter A. orcidid: 0000-0003-1200-3826 surname: Cawood fullname: Cawood, Peter A. organization: University of St Andrews – sequence: 3 givenname: Mei‐Fu surname: Zhou fullname: Zhou, Mei‐Fu organization: University of Hong Kong – sequence: 4 givenname: Manoj K. surname: Pandit fullname: Pandit, Manoj K. organization: University of Rajasthan – sequence: 5 givenname: Xiao‐Ping orcidid: 0000-0002-3203-039X surname: Xia fullname: Xia, Xiao‐Ping organization: Chinese Academy of Sciences – sequence: 6 givenname: Jun‐Hong surname: Zhao fullname: Zhao, Jun‐Hong organization: China University of Geosciences |
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SubjectTerms | Grains Isotope composition Isotopes Lava localized lithospheric extension low‐δ18O magma Magma Malani igneous suite NW India Oxygen Plate margins Rhyolite Rhyolites Rodinia south China Zircon |
Title | Low‐δ18O Rhyolites From the Malani Igneous Suite: A Positive Test for South China and NW India Linkage in Rodinia |
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