Early Cambrian Xiate Gabbro in Western Tianshan: Magmatic Records of Initial Subduction of the South Tianshan Ocean

LI Ping; ZHU Tao; LÜ Pengrui; WANG Hongliang; CHEN Junlu

doi:10.12401/j.nwg.2023146

Northwestern Geology > 2024 > 57(3): 44-58. > DOI: 10.12401/j.nwg.2023146

LI Ping，ZHU Tao，LÜ Pengrui，et al. Early Cambrian Xiate Gabbro in Western Tianshan: Magmatic Records of Initial Subduction of the South Tianshan Ocean[J]. Northwestern Geology，2024，57（3）：44−58. doi: 10.12401/j.nwg.2023146

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Early Cambrian Xiate Gabbro in Western Tianshan: Magmatic Records of Initial Subduction of the South Tianshan Ocean

LI Ping^{1, 2,},
ZHU Tao¹,
LÜ Pengrui¹,
WANG Hongliang¹,
CHEN Junlu^{1, 3}

1.
Xi’an Center of China Geological Survey/Geosciences Innovation Center of Northwest China, Xi’an 710119, Shaanxi, China
2.
Centre for Orogenic Belt Geology, CGS, Xi’an 710119, Shaanxi, China
3.
Strata-type Section for the Bottom of Wenlock−ShaanxiZiyang Field Scientific Observation, Xi’an 710119, Shaanxi, China

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Received Date: May 28, 2023
Revised Date: July 15, 2023
Accepted Date: July 23, 2023
Available Online: March 25, 2024

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Abstract

Abstract

Compared with the widespread magmatic events between the late Paleozoic and the early Mesozoic in Western Tianshan, the intrusive magmatic record of the early Paleozoic are preserved less, which conatrained our understanding on the early evolution of the Asian Ocean. Xiate gabbro is exposed in the north of the Southern Margin of the Central Tianshan, and zircon LA-ICPMS U-Pb dating shows that the formation age is 523±5 Ma, suggesting the Early Cambrian emplacement. Combined with the research on the regional igneous rocks, we believe that the Paleozoic subduction of the Paleo-Asian Ocean initiated in the west and then gradually expanded to the east, which may lay the foundation for the scissors closure (earlier in the west and later in the east) of the Tianshan Ocean. The geochemical characteristics of the Sodium and calcium alkaline rocks studied show that they have experienced the fractional crystallization of olivine, spinels, and the cumulation of plagioclase during their formation. The gabbro is a sodic and calc-alkaline series rocks, rich in large ion lithophile elements (LILE) and depleted in high field strength elements (HFSE). Discrimination diagrams of tectonic magmatic environment indicate that it is a product of arc magmatism. The ε Hf (t) values range from +1.47 to +11.91, indicating a distinct mantle material source; the higher (Th/Nb)_PM and lower Nb/La ratios imply the involvement of subduction materials during magmatic evolution. The formation age and petrogenetic characteristics of the Xiate gabbro indicate that the South Tianshan Ocean began to subduct towards the Central Tianshan Block in the Early Cambrian, and the initial arc magmatism was formed during the tectonic event.
- south margin of central Tianshan,
- the petrogenesis of gabbro,
- arc magmatic activity in Early Cambrian

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References (56)

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