The tectonic extensional event during the Late Indosinian Period in the southeastern Zhejiang Province: Evidence from the Dashuang pluton in Zhuji County
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摘要:
出露于浙江省东南部的大爽岩体为黑云母二长花岗岩，LA-ICP-MS锆石U-Pb年代学研究表明该岩体形成于227±2Ma，属印支晚期岩浆作用的产物。地球化学分析显示该岩石低Na2O、富K2O，A/CNK=1.26～1.49(大于1.1)，为强过铝质、钾玄质系列花岗岩；岩石稀土总量较高，富Sr(Sr=874.6×10-6～1158×10-6)，贫Yb(Yb=3.00×10-6～3.92×10-6)，富轻稀土而亏损重稀土，具轻微的负铕异常(δEu=0.68～0.70)；相对富集Rb、Th等大离子亲石元素，而亏损Nb、Ta等高场强元素；Sr-Nd同位素分析表明岩石具有较高的初始锶比值(ISr=0.710718～0.711008)和较低εNd(t)值(εNd(t) =-10.9～-11.1)，上述地球化学特征指示该岩体岩浆源区为古老的地壳物质。综合分析认为大爽岩体是古老地壳部分减压熔融的产物，受控于印支造山后的伸展应力作用。
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关键词:
- 印支期 /
- 锆石LA-ICPMS定年 /
- 全岩地球化学 /
- Sr-Nd同位素
Abstract:The Dashuang pluton in the southeast of Zhejiang Province is composed of biotite monzonitic granite. The LA-ICPMS zircon dating is 227±2Ma, which indicates that the pluton was formed during the Late Indosinian period. Most of granite samples exhibit lower Na2O,but higher K2O and A/CNK values ranging from 1.26 to 1.49 (>1.1). These results indicate strongly peraluminous and shoshonitic granite features, with enriched content of Sr but depleted content of Yb (Sr=874.6×10-6～1158×10-6, Yb=3.00×10-6～3.92×10-6). The content of rare earth elements is relatively higher, showing enriched in LREE and display weakly to moderately negative eupopium anomalies (δEu=0.63) in the chondrite- normalized REE distribution patterns. Large-ion lithophile elements Rb and Th are relatively enrichment while high field strength elements Nb, Ta are relatively depleted. The characteristics of Sr-Nd isotopic show high ages of ISr (=0.710718～0.711008) and low value of εNd(t) (=-10.9～-11.1) The geochemistry and Sr-Nd isotopic characteristics suggest that the Dashuang granitic pluton was derived from the ancient crust sources of partial decompression melting which under the post-orogenic (Indosinian) extensional tectonic setting.
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图 1
浙江诸暨大爽岩体地质简图及采样位置图
Figure 1.
Geological sketch map and sampling sites of the Dashuang granite pluton in Zhejiang
图 2
大爽花岗岩野外照片及镜下特征
Figure 2.
Photograph of field and microscopic characteristics for Dashuang granite
图 3
锆石阴极发光图像(CL)及锆石U-Pb谐和图
Figure 3.
CL imagines of zircons and zircon U-Pb concordant diagram
图 4
大爽花岗岩的TAS图解(a)、A/CNK-A/NK图解(b)及K2O-SiO2图解(c)
Figure 4.
Diagrams of TAS(a), A/CNK-A/NK(b) and K2O-SiO2 (c) for the Dashuang granite
图 5
大爽花岗岩微量元素蛛网图(a)和稀土元素配分型式图(b)(原始地幔标准化值和球粒陨石标准化值据Sun and McDonough, 1989；平均上地壳的分布特征据Taylor and Mclennan, 1981)
Figure 5.
Trace element spider diagram (a) and chondrite-normalized REE patterns (b) for the Dashuang granite (primitive mantle data and chondrite data after Sun and McDonough, 1989)
图 6
大爽岩体t-εNd(t)关系图(据沈渭洲等, 1993)
Figure 6.
Diagrams of t-εNd(t) relationship for the Dashuang granite (after Shen et al., 1993)
图 7
大爽花岗岩的构造判别图解(据Pearce et al., 1984; Pearce, 1996)
Figure 7.
Diagrams of discrimination for the Dashuang granite (after Pearce et al., 1984; Pearce, 1996)
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