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• W1765585718 endingPage "36" @default.
• W1765585718 startingPage "23" @default.
• W1765585718 abstract "The origin and tectonic setting of Precambrian sequences in the Central Asian Orogenic Belt (CAOB) have been debated due to a lack of high resolution geochronological data. Answering this question is essential for the understanding of the tectonic framework and Precambrian evolution of the blocks within the CAOB. Here we reported LA-ICP-MS detrital zircon U–Pb ages and in-situ Hf isotopic data for Neoproterozoic sedimentary cover in the northern Yili Block, an important component of the CAOB, in order to provide information on possible provenance and regional tectonic evolution. A total of 271 concordant U–Pb zircon ages from Neoproterozoic sedimentary cover in the northern Yili Block define three major age populations of 1900–1400 Ma, 1300–1150 Ma and 700–580 Ma, which are quite different from cratons and microcontinents involved in the CAOB. Although it is not completely consistent with the local basement ages, an autochthonous provenance interpretation is more suitable. Some zircon grains show significant old Hf model ages (TDMC; 3.9–2.4 Ga) and reveal continental crust as old as Paleoarchean probably existed. Continuous Mesoproterozoic zircon age populations exhibit large variations in the εHf(t) ratios, suggesting the long-time involvement of both reworked ancient crust and juvenile material. Similar Mesoproterozoic evolution pattern is identified in many continental terranes involved in the CAOB that surround the Tarim Craton. Based on our analysis and published research, we postulate that the northern Yili Block, together with Chinese Central Tianshan, Kyrgyz North Tianshan and some other microcontinents surrounding the Tarim Craton, once constituted the continental margin of the Tarim Craton in the Mesoproterozoic, formed by long-lived accretionary processes. Most of the late Neoproterozoic zircons exhibit significant positive εHf(t) ratios, suggesting the addition of juvenile crust. It is consistent with the tectonic event related to the East Africa Orogen in the Arabian-Nubian Shield and the northern Tarim Craton, indicating the affinity between them in Gondwana." @default.
• W1765585718 created "2016-06-24" @default.
• W1765585718 creator A5032764294 @default.
• W1765585718 creator A5044575854 @default.
• W1765585718 creator A5061134230 @default.
• W1765585718 creator A5064080108 @default.
• W1765585718 creator A5086330149 @default.
• W1765585718 creator A5089354178 @default.
• W1765585718 date "2015-12-01" @default.
• W1765585718 modified "2023-10-10" @default.
• W1765585718 title "Neoproterozoic diamictite-bearing sedimentary rocks in the northern Yili Block and their constraints on the Precambrian evolution of microcontinents in the Western Central Asian Orogenic Belt" @default.
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