北秦岭寨根地区富铌辉长岩地球化学特征及其构造意义

赵利刚; 李承东; 许雅雯; 武志宇; 常青松; 许腾; 滕雪明

doi:10.3799/dqkx.2018.340

Volume 44 Issue 1

Jan. 2019

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Article Navigation > Earth Science > 2019 > 44(1): 135-144

Zhao Ligang, Li Chengdong, Xu Yawen, Wu Zhiyu, Chang Qingsong, Xu Teng, Teng Xueming, 2019. Geochemistry of Nb-Enriched Gabbros in Zhaigen Area in Northern Qinling and Their Tectonic Significance. Earth Science, 44(1): 135-144. doi: 10.3799/dqkx.2018.340

Citation:

Zhao Ligang, Li Chengdong, Xu Yawen, Wu Zhiyu, Chang Qingsong, Xu Teng, Teng Xueming, 2019. Geochemistry of Nb-Enriched Gabbros in Zhaigen Area in Northern Qinling and Their Tectonic Significance. Earth Science, 44(1): 135-144. doi: 10.3799/dqkx.2018.340

Citation:

Zhao Ligang, Li Chengdong, Xu Yawen, Wu Zhiyu, Chang Qingsong, Xu Teng, Teng Xueming, 2019. Geochemistry of Nb-Enriched Gabbros in Zhaigen Area in Northern Qinling and Their Tectonic Significance. Earth Science, 44(1): 135-144. doi: 10.3799/dqkx.2018.340

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Geochemistry of Nb-Enriched Gabbros in Zhaigen Area in Northern Qinling and Their Tectonic Significance

doi: 10.3799/dqkx.2018.340

1.
Tianjin Center of China Geological Survey, Tianjin 300170, China
2.
Changqing Industry and Commerce Group, Xi'an 710016, China

Received Date: 2018-07-20
Publish Date: 2019-01-15

Abstract

Abstract

Nb-enriched gabbros are often associated with high-Mg diorite and adakite, which is considered to be a petrotectonic association of facies significance. However, this kind of magmatic activity has seldom been found in the southern side of the North Qinling orogenic belt in western Henan. Based on the method of petrology, geochemistry, isotope geochemistry and chronology for amphibolites from the Qinling Group in Zhaigen area, the Nb-enriched gabbros were separated from the deep plutonic complex in this study. The results show that the U-Pb age of metamorphic zircons from Nb-enriched gabbros is 484.3±1.8 Ma, which is similar to the peak of metamorphic ages of the UHP eclogites in this area. Nb-enriched gabbros are characterized by enrichment of Rb, Th and other heavy ion lithophilic elements and depletion of Nb, Ta, P and other high field strength elements. ε_Nd(t) values range from -1.61 to +0.49, and (⁸⁷Sr/⁸⁶Sr)_i values range from 0.714 273 to 0.723 936. We speculated that their formation was related to the remelting of mantle wedge peridotite by partially melted plate melts during the deep subduction of the Qinling paleocontinental crust. And a large amount of continental crust was added to the deep subduction. The discovery of Nb-enriched gabbros provides evidence for the existence of multiple small continental blocks in the Early Paleozoic of the Qinling orogen.
- Nb-enriched gabbros,
- geochemistry,
- Zhaigen,
- the Qinling orogenic belt

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References(57)

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