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• W3170727101 endingPage "175" @default.
• W3170727101 startingPage "158" @default.
• W3170727101 abstract "• Cretaceous A-type rocks in the Cathaysia block form two belts with tempo-spatial migrations. • The early and late Cretaceous A-type rocks are distinct in chemical and isotopic features. • Two-stage slab rollbacks beneath the Cathaysia block are proposed insights from A-type rocks. Petrogenesis and tectonic implications of the Cretaceous A-type rocks in the Cathaysia block remain controversial. We address this issue by the inland early Cretaceous (137–136 Ma) A-type Tiantangshan volcanic-intrusive complex and late Cretaceous A-type (96 Ma) Shihu-Huilong syenogranites, and integrating them with Cretaceous A-type rocks in the Cathaysia block. The Tiantangshan volcanics (trachyte-trachydacite-rhyolite) have ε Nd (t) (−3.5 to −2.6) and zircon ε Hf (t) (−3.0 to −1.3), suggesting their forming by partial melting of crust with significant addition of asthenosphere mantle-derived magma. The Tiantangshan granite, genetically connected with the volcanics, having higher ε Nd (t) (-1.2 to −0.8) and zircon ε Hf (t) (avg. 0.6) with more evolved composition, was likely formed by extensive fractional crystallization of the parental magma of the volcanics, recharged by asthenosphere-derived magma. The Shihu-Huilong syenogranites have initial 87 Sr/ 86 Sr (0.707987 to 0.708939), ε Nd (t) (−3.7 to −4.0) and zircon ε Hf (t) (avg. −1.6 to −0.6), suggesting a hybrid crustal and asthenospheric magma source. The early Cretaceous A-type rocks, distributed in the inland region with northeastward younging trend, mostly have A 2 chemical features and inhomogeneous isotopic composition. However, the Tiantangshan and Baijuhuajian A-type rocks are distinct by A 1 chemical subgroup and more depleted isotopic composition, likely reflective of intensified extensional back-arc environment due to slab rollback with high dipping angle. We propose an asynchronous and asymmetric rollback model during early Cretaceous that southern subducted paleo-Pacific plate started to retreat earlier than its northern part, and the rollback gradually developed northeastward. The late Cretaceous A-type granites in the coastal region, and Shihu-Huilong granites, are all characterized by A 1 subgroup with relatively homogeneous isotopic composition, suggesting more involvement of asthenospheric materials in magma sources, and that the coastal region was entirely under an intensified extensional back-arc environment due to slab rollback with high dipping angle. The rollback of the subducted paleo-Pacific plate during Cretaceous likely occurred as two discrete stages." @default.
• W3170727101 created "2021-06-22" @default.
• W3170727101 creator A5004284446 @default.
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• W3170727101 creator A5081191477 @default.
• W3170727101 date "2021-09-01" @default.
• W3170727101 modified "2023-10-16" @default.
• W3170727101 title "Two-stage rollbacks of the paleo-Pacific plate beneath the Cathaysia block during Cretaceous: Insights from A-type granites and volcanic rocks" @default.
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• W3170727101 doi "https://doi.org/10.1016/j.gr.2021.05.020" @default.
• W3170727101 hasPublicationYear "2021" @default.

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