The latest Neoproterozoic igneous activity on the northern margin of the Tarim Craton
Author(s): ZHANG Chuan-lin, YE Xian-tao, LI Huai-kun
Pages: 606-613
Year: 2014 Issue: 5
Journal: Geological Bulletin of China
Keyword: Tarim; Neoproterozoic granites; zircon U-Pb ages; Hf isotope; tectonic implications;
Abstract: Zircon U-Pb dating reveals that the K-feldspar granite and granodiorite in Quruqtagh on the northern margin of the Tarim block crystallized at 630.1 ± 1.3Ma and 630.6 ± 1.3Ma, respectively. Zircon Hf isotopes indicate that these granitic rocks were mainly derived from partial melting of old andestic-basic crust with possible involvement of basaltic magma from mantle sources. Based on a comprehensive analysis of the Neoproterozoic igneous activities in Tarim, the authors argue that the 650~615Ma igneous rocks in Quruqtagh were the latest phase of the Neoproterozoic igneous activities and genetically related to the breakup of the Rodin-ia suppercontinent, i.e., they had nothing to do with the Pan-Africa orogeny. From Neoproterozoic to Cambrian, sedimentary se-quences in Quruqtagh exhibited typical sedimentation features on a passive continental margin, which indicates that the Tarim block had never incorporated into the Gondwana Land.
Pages: 606-613
Year: 2014 Issue: 5
Journal: Geological Bulletin of China
Keyword: Tarim; Neoproterozoic granites; zircon U-Pb ages; Hf isotope; tectonic implications;
Abstract: Zircon U-Pb dating reveals that the K-feldspar granite and granodiorite in Quruqtagh on the northern margin of the Tarim block crystallized at 630.1 ± 1.3Ma and 630.6 ± 1.3Ma, respectively. Zircon Hf isotopes indicate that these granitic rocks were mainly derived from partial melting of old andestic-basic crust with possible involvement of basaltic magma from mantle sources. Based on a comprehensive analysis of the Neoproterozoic igneous activities in Tarim, the authors argue that the 650~615Ma igneous rocks in Quruqtagh were the latest phase of the Neoproterozoic igneous activities and genetically related to the breakup of the Rodin-ia suppercontinent, i.e., they had nothing to do with the Pan-Africa orogeny. From Neoproterozoic to Cambrian, sedimentary se-quences in Quruqtagh exhibited typical sedimentation features on a passive continental margin, which indicates that the Tarim block had never incorporated into the Gondwana Land.
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