埃塞俄比亚施瑞地区花岗岩地球化学特征及构造环境

韩世礼; 张术根; 柳建新; 丁俊; 张文山

doi:10.3799/dqkx.2014.002

Volume 39 Issue 1

Jan. 2014

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Han Shili, Zhang Shugen, Liu Jianxin, Ding Jun, Zhang Wenshan, 2014. Geochemistry and Tectonic Setting of Granites from Shire Region, Ethiopia. Earth Science, 39(1): 10-20. doi: 10.3799/dqkx.2014.002

Citation:

Han Shili, Zhang Shugen, Liu Jianxin, Ding Jun, Zhang Wenshan, 2014. Geochemistry and Tectonic Setting of Granites from Shire Region, Ethiopia. Earth Science, 39(1): 10-20. doi: 10.3799/dqkx.2014.002

Han Shili, Zhang Shugen, Liu Jianxin, Ding Jun, Zhang Wenshan, 2014. Geochemistry and Tectonic Setting of Granites from Shire Region, Ethiopia. Earth Science, 39(1): 10-20. doi: 10.3799/dqkx.2014.002

Citation:

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Geochemistry and Tectonic Setting of Granites from Shire Region, Ethiopia

doi: 10.3799/dqkx.2014.002

Han Shili^{1, 2},
Zhang Shugen^{2
,
,},
Liu Jianxin²,
Ding Jun²,
Zhang Wenshan^{2, 3}

1.
School of Nuclear Resources Engineering, University of South China, Hengyang 421001, China
2.
School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
3.
Beijing Donia Resources Co., Ltd., Beijing 100012, China

Received Date: 2013-07-23
Publish Date: 2014-01-01

Abstract

Abstract

There are pre-, syn-, and post-orogenic granites in Shire region of northern Ethiopia. Whole rock Sm-Nd isochron dating results show that diagenetic age of pre-, and post-orogenic ages are 824.4±15.5 Ma and 517.9±5.8 Ma respectively. Major, rare-earth and trace elements of three kinds of granite are obviously different. The pre-orogenic granites are relatively low in MgO and high in SiO₂, belonging to the peraluminous series granite, with low K content and slight light REE enrichment, high large-ion lithophile element abundance and relative depletion of HFSE. The syn-orogenic granite belongs to the quasi-aluminous rock and high-potassium calc-alkaline granite, with the light REE enriched pattern, high large-ion lithophile element and HFSE abundances. The post-orogenic granite belongs to the weakly peraluminous high-potassium calc-alkaline granite, which has the chondrite-normalized REE patterns in the type of "gull" with severe depletion in Eu. The large-ion lithophile elements are concentrated, while P and Ti are severely depleted here. Comprehensive study shows both the pre- and syn-orogenic granites are I-type mantle-source granites in the passive continental margin-volcanic island arc tectonic setting; the post-orogenic granites are A2-type crust-source major granites, which were formed from the melting of thinner crust after the closure of oceanic basins and the growth of Arabian-Nubian shield.
- granite,
- geochemistry,
- tectonics,
- Sm-Nd isotope,
- Ethiopia,
- Shire

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References(35)

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