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Timing the Lithospheric Extension of the Northeastern China: Evidence from the Late Mesozoic NianzishanA-type granitic composite

Qin Jinhua ,LiuCui2, ChenYuchuan1, DengJinfu2
1MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS,Beijing, 100037,China;2China University of Geoscience(Beijing),100083, Beijing, China

 

Newzircon U-Pb datings with laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), whole-rock geochemical datas and Sm-Nd and Rb-Sr isotopic data are presented formiarolitic alkaline granites, syenoporphyrite and rhyolite of the Nianzishan A-type granitic compositefrom The Great Xing’ an Range - Songliao Basin in Northeast (NE) China. New crystallization ages of 112.95 ±0.93 Ma and 114.1 ±1.71 Ma for granite and 118.6 ±0.51 Ma for syenoporphyrite by highprecision LA-ICP-MS are carried out. The εNd (t) of the rocks range from +1.85 to +2.06, with Nd model ages (TDM) from 671 Ma to 821 Ma. These indicates that the NianzishanA-type granitic composite wasoriginted fromjuvenilesource rocks. Nianzishan A-type granitic compositeexhibits geochemical characteristics of A1-and AA-type granite, which occurwithin anextensionalsetting.We attribute the magmatism to the regional extension and lithospheric thinning caused by the subduction of the western Pacificplateabout 120 to100 Ma.

 

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Keywords:A-type granite, new zircon U-Pb zircon ages, NE China, lithospheric extension

DOI:
0.1007/s12583-018-0996-9
CLC number:
U469.72
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