The Indosinian collision-extension event between the South China Block and the Palaeo-Pacific plate: Evidence from Indosinian alkaline granitic rocks in Dashuang, eastern Zhejiang, South China

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• 作者：Jianren Mao^a ; ^{jianrenm@hotmail.com} ; Haimin Ye^a ; Kai Liu^a ; Zilong Li^b ; ^{zilongli@zju.edu.cn} ; Yutaka Takahashi^c ; ^{Takahashi-yutaka@asit.go.jp} ; Xilin Zhao^a ; Weon-Seo Kee^d ; ^{wskee@kigam.re.kr}
• 关键词：Dashuang alkaline pluton ; U&ndash ; Pb zircon dating ; Laser ablation ; Indosinian granite ; South China ; Geodynamic model
• 刊名：Lithos
• 出版年：2013
• 出版时间：July, 2013
• 年：2013
• 卷：172-173
• 期：Complete
• 页码：81-97
• 全文大小：2993 K

文摘

This study reports on the first comprehensive analysis of the geology, petrology and origin of the Dashuang pluton in Jinhua, eastern Zhejiang, South China, which is predominantly composed of quartz monzonite and subordinate quartz syenite that includes variable amounts of aegirine-augite. The quartz monzonite has a porphyritic texture defined by K-feldspar phenocrysts, whereas the quartz syenite shows considerable variation in grain size and is categorised into fine- and coarse-grained types. Zircons from the quartz monzonite and fine-grained quartz syenite yield LA-MC-ICP-MS (laser ablation-multi-collector-inductively coupled plasma-mass spectrometry) U-Pb ages of 231.60 ¡À 0.86 Ma and 231.7 ¡À 1.1 Ma, respectively, indicating crystallisation in the Middle Triassic.

The chemistry of the quartz monzonite indicates a calc-alkaline to alkaline evolutionary trend, which may reflect partial melting of upper mantle contaminated by Proterozoic basement rocks, subjected to fractional crystallisation during ascent. Both the fine- and coarse-grained quartz syenites are alkaline and have high rare earth element (REE) concentrations, especially light rare earth elements (LREE), and are relatively enriched in large ion lithosphere elements (LILE). The Al₂O₃ and NaO₂ contents of the quartz syenite increase proportionally with SiO₂, owing to greater amounts of aegirine-augite and feldspar. The fine-grained quartz syenite has the lowest initial ⁸⁷Sr/⁸⁶Sr ratio and lowest Nd model age, and the highest ¦Å_Nd value compared with the quartz monzonite. The quartz syenite compositions are best explained by fractional crystallisation of an enriched mantle-derived alkaline magma. Slight chemical variations result from source heterogeneities, as well as the spatially variable degrees of melting, assimilation, and other factors.

Our new age and geochemical data for the alkaline rocks in eastern Zhejiang, considered together with collisional granites from South Korea, support a history of collision and extension between the Palaeo-Pacific plate and the South China Block during the Indosinian. We use these data to refine the geodynamic model for Indosinian multi-plate convergence in South China.