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2009•Journal of Northwest UniversityRequires access

Formation mechanisms of the Yematan UHP terrane,the North Qaidam:constrains from zircon U-Pb dating

Di Li

Open publisher page 4 citations

Abstract

Aim To provide new evidence for the discussion of the formation mechanism of the Yematan UHP terrane in the North Qaidam belt.Methods Integrated study of Cathodoluminescence(CL) imaging,LA-ICP-MS in situ trace element analyses and U-Pb dating were carried out for zircon grains from two paragneisses interbed in the Yematan ultrahigh pressure metamorphic eclogite.Results The metamorphic age of these two paragneisses are between 421 ～ 458 Ma,which is well consistent with that of the Yematan UHP eclogite.Conclusion The Yematan eclogite and their country rock paragneisses underwent coeval Early Paleozoic HP/UHP metamorphism,they may not be the product of typical oceanic crustal deep subduction but the continental deep subduction.

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Aim To provide new evidence for the discussion of the formation mechanism of the Yematan UHP terrane in the North Qaidam belt.Methods Integrated study of Cathodoluminescence(CL) imaging,LA-ICP-MS in situ trace element analyses and U-Pb dating were carried out for zircon grains from two paragneisses interbed in the Yematan ultrahigh pressure metamorphic eclogite.Results The metamorphic age of these two paragneisses are between 421 ～ 458 Ma,which is well consistent with that of the Yematan UHP eclogite.Conclusion The Yematan eclogite and their country rock paragneisses underwent coeval Early Paleozoic HP/UHP metamorphism,they may not be the product of typical oceanic crustal deep subduction but the continental deep subduction.

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Available abstract

Aim To provide new evidence for the discussion of the formation mechanism of the Yematan UHP terrane in the North Qaidam belt.Methods Integrated study of Cathodoluminescence(CL) imaging,LA-ICP-MS in situ trace element analyses and U-Pb dating were carried out for zircon grains from two paragneisses interbed in the Yematan ultrahigh pressure metamorphic eclogite.Results The metamorphic age of these two paragneisses are between 421 ～ 458 Ma,which is well consistent with that of the Yematan UHP eclogite.Conclusion The Yematan eclogite and their country rock paragneisses underwent coeval Early Paleozoic HP/UHP metamorphism,they may not be the product of typical oceanic crustal deep subduction but the continental deep subduction.

Key concepts: Zircon, Eclogite, Terrane, Geology, Geochemistry, Metamorphism, Metamorphic rock, Subduction

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Formation mechanisms of the Yematan UHP terrane,the North Qaidam:constrains from zircon U-Pb dating — Research Paper | ScholarLens