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Zircon U–Pb age and Sr–Nd–Hf isotope geochemistry of Permian granodiorite and associated gabbro in the Songliao Block, NE China and implications for growth of juvenile crust
Shen Liu; Ruizhong Hu; Shan Gao; Caixia Feng; Guangying Feng; Ian M. Coulson; Cai Li; Tao Wang; Youqiang Qi
2010
发表期刊Lithos
卷号114期号:3-4页码:423-436
其他摘要

Post-orogenic granitic and associated mafic rocks from northeastern (NE) China consist of granodiorite and gabbro intrusions. We report here upon new U–Pb zircon ages, geochemical data and Sr–Nd–Hf isotopic data for these rocks. LA-ICP-MS U–Pb zircon analysis yields an age of 262.8 ± 1.0 Ma for the granitic rocks, and a uniform age of 262.1 ± 0.7 Ma for the gabbro. Most of the granitic and mafic rocks are characterised by low K2O + Na2O, and pertain to the subalkaline series in the total alkali–silica diagram. The granodiorite samples show low (87Sr/86Sr)i ranging from 0.700 to 0.705, positive εNd(t) values from +0.3 to +0.8, and large variation in εHf(t) values of between − 4.0 and +2.5, indicating that both newly underplated basalt (70–80%) and ancient lower crustal sources (20–30%) contributed to their origin. Furthermore, positive εHf(t) values with two-stage model ages (TDM2) of 1123–1260 Ma, together with Nd model ages (960–1000 Ma), suggest an important episode of crustal growth during the Meso-Neoproterozoic beneath the Songliao Block. In contrast, the investigated gabbro is characterised by relatively high (87Sr/86Sr)i ratios (0.707–0.708), negative εNd(t) (− 5.9 to − 5.3) and εHf(t) values (− 5.0 to − 2.3), implying that this was derived from an enriched mantle source. The geochemical data indicate that the granitic magmas underwent separation of clinopyroxene, hornblende, K-feldspar, plagioclase, Ti-bearing phases (e.g., rutile, ilmenite, titanite), apatite and zircon during their evolution. Whereas the gabbro is characterised by low MgO (2.92–3.92 wt.%), Mg# (35–41) and compatible elements content, such as Cr (10–68 ppm), Co (16–31 ppm) and Ni (5.7–33 ppm), features of a more evolved mafic magma. There is no evidence that the granitic and mafic rocks were affected by crustal contamination during emplacement. Our interpretation is that the two coeval intrusive suites were both formed in a post-orogenic extensional setting, related to lithospheric delamination or ‘collapse’ of the Central Asian Orogenic Belt (CAOB) (Xingmeng orogenic Belt in China).

关键词Post-orogenic Late Palaeozoic Magmatism Granodiorite Gabbro Lithospheric Delamination Crustal Growth Ne China
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/352002/4092
专题矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文
矿床地球化学国家重点实验室
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GB/T 7714
Shen Liu,Ruizhong Hu,Shan Gao,等. Zircon U–Pb age and Sr–Nd–Hf isotope geochemistry of Permian granodiorite and associated gabbro in the Songliao Block, NE China and implications for growth of juvenile crust[J]. Lithos,2010,114(3-4):423-436.
APA Shen Liu.,Ruizhong Hu.,Shan Gao.,Caixia Feng.,Guangying Feng.,...&Youqiang Qi.(2010).Zircon U–Pb age and Sr–Nd–Hf isotope geochemistry of Permian granodiorite and associated gabbro in the Songliao Block, NE China and implications for growth of juvenile crust.Lithos,114(3-4),423-436.
MLA Shen Liu,et al."Zircon U–Pb age and Sr–Nd–Hf isotope geochemistry of Permian granodiorite and associated gabbro in the Songliao Block, NE China and implications for growth of juvenile crust".Lithos 114.3-4(2010):423-436.
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