LA-ICP-MS zircon U-Pb dating, geochemistry of the Mishuling intrusion in western Qinling and their tectonic significance
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摘要:
秦岭造山带南缘勉略缝合带附近发育东西向展布的印支期花岗岩带，位于西秦岭地区勉略缝合带北侧的糜署岭岩体是该花岗岩带的一部分。本文对糜署岭岩体寄主岩及二长闪长质包体进行LA-ICP-MS 锆石U-Pb定年和地球化学特征研究。结果表明，糜署岭岩体的结晶年龄为214.5±1.6Ma(MSWD=0.24)。糜署岭岩体寄主岩和二长闪长质包体A/CNK在0.64~0.97之间，具有准铝质特征。稀土元素总量(∑REE)为197.3×10-6~246.6×10-6，在稀土元素配分图上显示为右倾型，Eu具有中等的负异常。高场强元素Ta、Nb、P、Ti和大离子亲石元素Sr、Ba明显亏损，而Rb、U、La、Zr、Hf、Nd、Y等元素具有明显的正异常。寄主岩和包体是同源岩浆演化而来，是以基性岩为主的源岩部分熔融形成的花岗质岩浆上升侵位形成的，为Ⅰ型花岗岩。糜署岭岩体形成于同碰撞(挤压环境)向碰撞后(伸展环境)转化阶段，为后造山花岗岩类，是印支期扬子与华北地块全面碰撞导致的地壳增厚下地壳部分熔融的产物。
Abstract:An EW trending Indosinian granitoide belt distributes near the Mianlue Suture Zone in the southern margin of the Qinling Orogenic Belt. The Mishuling intrution is one of the Indosinian granitoids located in the western Qingling and north to the Mianlue Suture Zone. This article studies the LA-ICP-MS zircon U-Pb ages and geochemistry characteristics of the Mishuling biotite quartz monzonite and monzodiorite enclaves. The results show that the crystallization age of the Mishuling biotite quartz monzonite is 214.5±1.6Ma(MSWD=0.24). The A/CNK ratios of the Mishuling biotite quartz monzonite and monzodiorite enclaves range from 0.64 to 0.97, indicating that the granitoids are metaluminous rocks. The ∑REE of the granitoides are 197.3×10-6~246.6×10-6. The REE patterns show rightward incline and moderate negative Eu anomaly. The trace element geochemistry is characterized evidently by negative anomaly of Ta, Nb, P, Ti, Ba，Sr, etc. and positive anomaly of Rb, U, La, Zr, Hf, Nd, Y, etc. The host rock biotite quartz monzonite and enclaves monzodiorite are I-type granitoids，which may originate from a single magma. The magma was formed by partial melting of basic rocks. The Mishuling intrusions are post-orogenic granitoids which were formed in a transitional tectonic setting from syn- (compressional setting) to post-collision (extensional setting). They were products formed by partial melting of thicken lower crust resulting from the collision between the North China plate and Yangtze plate.
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Key words:
- Mishuling intrusion /
- Zircon U-Pb age /
- Geochemistry /
- Tectonic setting /
- Western Qinling Orogenic Belt
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图 1
西秦岭地区糜署岭岩体分布图
Figure 1.
Distribution of the Mishuling intrusion in the western Qinling
图 2
糜署岭岩体野外露头照片和磷灰石显微照片(正交偏光)
Figure 2.
Field photographs of the monzodiorite enclaves in the Mishuling intrusion and micrographs of the apatite (crossed polarizers)
图 3
糜署岭岩体寄主岩(MSL01)锆石CL图像和年龄值
Figure 3.
CL images and 206Pb/238U ages of single zircon of the host rock(sample MSL01)in Mishuling intrusion
图 4
糜署岭岩体寄主岩(MSL01)LA-ICP-MS锆石U-Pb年龄图
Figure 4.
LA-ICP-MS zircon U-Pb concordia diagram of the host rock(MSL01)in Mishuling intrusion
图 5
糜署岭岩体QAP图解(据Streckeisen，1973)
Figure 5.
QAP diagrams for Mishuling intrusion(after Streckeisen，1973)
图 6
糜署岭岩体A/NK-A/CNK图解(据Maniar and Piccoli, 1989; 虚线代表Ⅰ型和S型花岗岩之间的边界, 据Chappell and White, 1992)
Figure 6.
A/NK-A/CNK diagrams for Mishuling intrusion(after Maniar and Piccoli, 1989; dashed line represents boundary between I- and S-type granitoides, after Chappell and White, 1992)
图 7
糜署岭岩体K2O-SiO2图解(据Rickwood，1989)
Figure 7.
K2O vs. SiO2 diagrams for Mishuling intrusion(after Rickwood，1989)
图 8
糜署岭岩体稀土元素球粒陨石标准化曲线(标准化值据Sun and McDonough, 1989)
Figure 8.
Chondrite-normalized REE patterns for Mishuling intrusion (normalization values after Sun and McDonough, 1989)
图 9
糜署岭岩体微量元素蛛网图(标准化值据Sun and McDonough, 1989)
Figure 9.
Trace element spider diagram for Mishuling intrusion(normalization values after Sun and McDonough, 1989)
图 10
糜署岭岩体P2O5-SiO2和Y-Rb图解
Figure 10.
P2O5-SiO2 and Y-Rb diagrams for Mishuling intrusion
图 12
糜署岭岩体FeOT-MgO图解(据Zorpi，1989)
Figure 12.
FeOT vs. MgO diagrams of Mishuling intrusion(after Zorpi，1989)
图 13
糜署岭岩体物质来源示踪(据White et al., 2001;同位素数据据张宏飞等，2005；Qin et al., 2009)
Figure 13.
εNd-87Sr/86Sr diagram for Mishuling intrusion(after White et al., 2001; isotope data after Zhang et al., 2005; Qin et al., 2009)
图 14
糜署岭岩体微量元素构造环境判别图解(a、b, 据Pearce et al., 1984； c, 据Pearce，1996；d, 据Harris et al., 1986)
Figure 14.
Diagrams of the tectonic setting of trace elements for Mishuling intrusion (a, b, after Pearce et al., 1984； c, after Pearce，1996；d, after Harris et al., 1986)
图 15
糜署岭岩体Th/Yb-Ta/Yb图解(据Michael and Eva, 2000)
Figure 15.
Th/Yb vs. Ta/Yb diagrams for Mishuling intrusion(after Michael and Eva, 2000)
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