Geochemical Characteristics and Tectonic Setting of the Jijitaizi Ophiolite in Beishan area

WU Lei; ZHAI Xinwei; WANG Erteng; WANG Yun; GUO Zhi’ang; SONG Gaorui; WANG Jinrong; DU Jun

doi:10.12401/j.nwg.2023038

Northwestern Geology > 2025 > 58(1): 27-42. > DOI: 10.12401/j.nwg.2023038

WU Lei，ZHAI Xinwei，WANG Erteng，et al. Geochemical Characteristics and Tectonic Setting of the Jijitaizi Ophiolite in Beishan area[J]. Northwestern Geology，2025，58（1）：27−42. doi: 10.12401/j.nwg.2023038

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Geochemical Characteristics and Tectonic Setting of the Jijitaizi Ophiolite in Beishan area

WU Lei^{1, 2,},
ZHAI Xinwei^{1, 2, ,},
WANG Erteng^{1, 2},
WANG Yun^{1, 2},
GUO Zhi’ang^{1, 2},
SONG Gaorui^{1, 2},
WANG Jinrong^{1, 2},
DU Jun^{1, 3}

1.
School of Earth Sciences, Lanzhou University, Lanzhou 730000, Gansu, China
2.
Key laboratory of Mineral Resources in Western China, Lanzhou 730000, Gansu, China
3.
People's Government of Caijia Town, Jiangjin District, Chongqing 400000, China

More Information

Received Date: October 09, 2022
Revised Date: February 23, 2023
Accepted Date: September 11, 2023
Available Online: December 18, 2024

Graphical Abstract

Abstract

Abstract

The Jijitaizi ophiolite belt in the middle of the Beishan orogenic belt, between the Mingshui-Hanshan microcontinental block and the Gongpoquan unit is an important part of the Jijitaizi-Xiaohuangshan ophiolite belt, composed of ultrabasic rocks, gabbro and basalt. To reveal the tectonic setting of Jijitaizi ophiolite belt, gabbro and basalt are selected for petrological and geochemical studies. MgO of gabbro and basalt is 6.04%～6.73% and 6.21%～9.66%, Mg^# values are 32.33～37.03, 27.58～46.27, respectively, SI consolidation index is 27.66～31.55 and 24.96～42.20, Al₂O₃ is 15.82%～16.79% and 13.38%～15.38%, Na₂O higher than K₂O content (Na₂O/K₂O=9.75～17.15, 1.95～23.26), Na₂O+K₂O is 4.48%～4.90% and 3.3%～4.68%, P₂O₅ is 0.07%～0.09% and 0.16%～0.27%. Both of gabbro and basalt enrichment of LILEs and LREE, depletion of HREE and HFSEs and Eu have no obvious anomalies (δEu=0.98～1.09、0.88～1.06). (⁸⁷Sr/⁸⁶Sr)_i is 0.703700～0.704768, (¹⁴³Nd/¹⁴⁴Nd)_i is 0.512234～0.512361, ε_Nd(t) is +4.18～+6.66. These characteristics indicate Jijitaizi ophiolite belt belong to SSZ type ophiolite belt, basalt and gabbro originated from partial melting of the depleted mantle and experienced crystallization differentiation and crustal contamination. Combined with geological background, it can be concluded that the Jijitaizi ophiolite may form in a back-arc basin, resaulting from northward subduction of the Hongliuhe-Niujuanzi-Xichangjing ocean basin.
- Beishan area,
- Jijitaizi ophiolite,
- SSZ type ophiolite,
- back-arc expansion

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Geochemical Characteristics and Tectonic Setting of the Jijitaizi Ophiolite in Beishan area

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Geochemical Characteristics and Tectonic Setting of the Jijitaizi Ophiolite in Beishan area

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