东秦岭造山带白垩系造山花岗岩成因及地球动力学意义

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Zhuang Zhao , Xiaoyong Yang , Zhengwei Zhang , Youqiang Duan
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引用次数: 2

摘要

本文报道了华北克拉通南缘张士营(ZSY)和泰山庙(TSM)两个岩体的系统锆石U-Pb测年、Hf同位素、主微量元素测年,探讨了它们的岩石成因和地质演化。ZSY和TSM花岗岩的LA-ICP-MS U-Pb锆石测年结果表明,206Pb/238U年龄分别为122.8±1.5 Ma和112.1±3.2 Ma。ZSY石英正长岩富集SiO2 (65.59 ~ 68.1 wt.%)、Al2O3 (15.39 ~ 15.64 wt.%),高Sr (468 ~ 666 ppm)、Sr/Y(35 ~ 45)、(La/Yb)N(20.1 ~ 22.1)比,低Y(13.1 ~ 16.6 ppm)、Yb (1.46 ~ 1.77 ppm),贫Nb、Ta、P、Ti、Mg、Y, Eu异常可忽略,与阿达质岩相似。该岩体锆石的εHf(t)值在- 17.6 ~ - 5.7之间,平均为- 15.2,TDM2年龄(1.29 ~ 1.91 Ga)远低于北陆南缘基底岩,表明中西石英正长岩是由增厚下地壳的部分熔融作用形成的,幔源物质参与较少。TSM岩体具有高SiO2 (697 ~ 71.87 wt.%)、总碱(Na2O + K2O = 8.5 ~ 9.41 wt.%)、高HFSE (Zr、Nb、Ga、Y)、低CaO (0.27 ~ 1.25 wt.%)、Ba、Sr、Eu等a型花岗岩特征。它们的εHf(T)值在−12.4 ~−1.6之间,平均为−7.6;TDM2值在1.10 ~ 1.63 Ga之间,平均为1.38 Ma。我们认为,TSM花岗岩是由调性地壳源在高温低压条件下部分熔融形成的,残留着丰富的斜长石。在北陆块南缘,地幔的物质输入也与εHf(t)值高于调性地壳和高温有关。研究结果表明,在ZSY埃达质岩(~ 123 Ma)侵入之前,NCC南缘的厚化LCC仍然存在。TSM花岗岩侵入期(~ 112 Ma)转为伸展环境。这一伸展事件反映了北陆盆地岩石圈减薄和去碳酸化的背景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Petrogenesis and geodynamic implications of the Cretaceous anorogenic granitoids in east Qingling orogen

Petrogenesis and geodynamic implications of the Cretaceous anorogenic granitoids in east Qingling orogen

We report systematical zircon U–Pb datings, Hf isotopic data, major and trace element date on the Zhangshiying (ZSY) and the Taishanmiao (TSM) two plutons at the southern margin of the North China Craton (NCC), in order to investigate their petrogenesis and geological evolution. LA-ICP-MS U–Pb zircon of the ZSY and TSM granites dating yield a weighted mean 206Pb/238U age of 122.8 ± 1.5 Ma and 112.1 ± 3.2 Ma. The ZSY quartz syenite enriched in SiO2 (65.59–68.1 wt.%), Al2O3 (15.39–15.64 wt.%), high Sr (468–666 ppm), Sr/Y (35–45), (La/Yb)N (20.1–22.1) ratios, low Y(13.1–16.6 ppm), Yb (1.46–1.77 ppm), depleted in Nb, Ta, P, Ti, Mg, Y and negligible Eu anomalies, which suggesting that the quartz syenite are similar to adakitic rocks. Zircons from this pluton give εHf(t) values from −17.6 to −5.7 with an average of −15.2, and their TDM2 ages (1.29–1.91 Ga) are much younger than the basement rocks of the south margin of the NCC, which indicate that the ZSY quartz syenite were generated by partial melting of thickened lower crust with minor involvement of mantle-derived materials. The TSM pluton has characteristic of A-type granite, such as, high SiO2 (69.7–71.87 wt.%), total alkalis (Na2O + K2O = 8.5 to 9.41 wt.%), HFSE (Zr, Nb, Ga, Y), low CaO (0.27–1.25 wt.%), Ba, Sr and Eu. Their εHf(T) values ranges from −12.4 to −1.6 with an average of −7.6 and TDM2 ranges from 1.10 to 1.63 Ga with an average of 1.38 Ma. We propose that the TSM granites results from partial melting of tonalitic crustal sources with a plagioclase-rich residual at high temperatures and low pressure. Materials input from the mantle also is involved for the higher εHf(t) values than tonalitic crustal at the southern margin of NCC and high temperatures. Our results suggested that the thickened LCC at the south margin of the NCC is still existence before the intrusive of the ZSY adakitic rocks (∼123 Ma). During the intrusive of the TSM granites (∼112 Ma) it turns to extensional environment. This extensional event reflects the background of lithospheric thinning and decratonization of NCC.

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来源期刊
Solid Earth Sciences
Solid Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
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3.60
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5.00%
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20
审稿时长
103 days
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