Xialu N-MORB gabbros and diabases in the Xigaze ophiolite: Record of subduction initiation of the Yarlung Zangbo Tethyan Ocean at Early Cretaceous

LIU Han; WANG Baodi; CHEN Li; WANG Liquan; ZHANG Yujie; LI Jun; GOU Zhengbin; ZHANG Shizhen

2021 Vol. 40, No. 11

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LIU Han, WANG Baodi, CHEN Li, WANG Liquan, ZHANG Yujie, LI Jun, GOU Zhengbin, ZHANG Shizhen. Xialu N-MORB gabbros and diabases in the Xigaze ophiolite: Record of subduction initiation of the Yarlung Zangbo Tethyan Ocean at Early Cretaceous[J]. Geological Bulletin of China, 2021, 40(11): 1836-1851.

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LIU Han, WANG Baodi, CHEN Li, WANG Liquan, ZHANG Yujie, LI Jun, GOU Zhengbin, ZHANG Shizhen. Xialu N-MORB gabbros and diabases in the Xigaze ophiolite: Record of subduction initiation of the Yarlung Zangbo Tethyan Ocean at Early Cretaceous[J]. Geological Bulletin of China, 2021, 40(11): 1836-1851.

Xialu N-MORB gabbros and diabases in the Xigaze ophiolite: Record of subduction initiation of the Yarlung Zangbo Tethyan Ocean at Early Cretaceous

1.
Chengdu Center, China Geological Survey, Chengdu 610081, Sichuan, China
2.
China Aero Geophysical Survey and Remote Sensing Center for Natural Resources, Beijing 100083, China

Received Date: 19 April 2021

Revised Date: 08 May 2021

Publish Date: 15 November 2021

Abstract

Abstract

The 130~120 Ma ophiolite is the most widely distributed in the Yarlung Zangbo suture zone, however, its formation environment remains controversial.Based on zircon U-Pb ages, whole-rock geochemical date of Xialu gabbros and diabases, and a large number of data of Xigaze ophiolite, the tectonic environment and dynamic significance of Early Cretaceous ophiolite were discussed.LA-ICP-MS zircon U-Pb dating of the Xialu gabbro yields weighted mean age of 123.8 ± 1.1 Ma(MSWD = 0.97), indicating one of the 130~120 Ma Xigaze ophiolite relics.Some gabbro samples are characterized by high Cao, low SiO₂ and very low K₂O and Na₂O contents, which can be attributed to a rodingitization process, whereas diabases suffer from minimal affection of fluid.Xialu gabbros and diabases show N-MORB type characteristics and more depleted in light rare earth elements than normal N-MORB, suggesting high degree partial melting of a depleted mantle of spinel lherzolite source.The N-MORB basic rocks of the 130~120 Ma ophiolite in Xigaze were generated from a mantle source with inhomogeneous mixture of subduction components, and characterized by the transition from MORB to VAB, with a minimal adding of continental crust, which suggest that the Xigaze ophiolite was formed in an intra-oceanic arc system.Combined with regional geology, it is suggested that the 130~120 Ma ophiolite in Xigaze is similar to the IBM fore-arc ophiolite in development time, lithology and geochemistry, representing a subduction initiation in the Yarlung Zangbo Tethys Ocean.
- Yarlung Zangbo suture zone /
- Xigaze /
- Early Cretaceous /
- intra-oceanic arc /
- fore-arc ophiolite /
- subduction initiation

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References

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