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Geochemistry and geochronology of the S hihuiyao ophiolite from the K elameili suture in E ast J unggar: Constraint on the tectonic evolution of the K elameili O cean
Author(s) -
Liu Junfeng,
Xu Xiaoyi,
Wang Lei,
Li Yong
Publication year - 2018
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/gj.3244
Subject(s) - ophiolite , geology , geochemistry , fibrous joint , lile , basalt , rare earth element , zircon , peridotite , tectonics , island arc , subduction , partial melting , mineralogy , paleontology , rare earth , medicine , anatomy
The Kelameili suture located between the eastern Tianshan Junggar Plate and the Harlik island arc in east Tianshan. This suture is well known as identifying the Kelameili ophiolite and the Tucker Takezale ophiolitic melange. This paper first reports a new discovery of the Shihuiyao ophiolite, which is 70 km away from the Takezale ophiolitic mélange to the east. It is mainly composed of the variable serpentinized peridotite, metagabbro, and minor siliceous rocks. The serpentinite and gabbros are characterized by high content of Al 2 O 3 and normal mid‐ocean ridge basalt (N‐MORB)‐type rare earth element compositions. These rocks also show a typical characteristic of origin of island arc setting with depletion of high‐field strength element (HFSE) and enrichment of large‐ion lithophile element (LILE). The LA‐ICP‐MS dating of zircon grains from gabbros gave a weighted mean 206 Pb/ 238 U age of 352 Ma, which was interpreted to represent the age of the Kelameili Ocean. This paper provided an important constraint on the tectonic evolution of the Kelameili Ocean.