Petrogenesis of the Mesozoic Malage complex pluton in Eastern Inner Mongolia and its enlightenment to the regional tectonic evolution

LI Mengxing; WANG Lijuan; LI Zhen; WANG Quan; LI Juan

doi:10.12097/gbc.2022.06.030

2025 Vol. 44, No. 6

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LI Mengxing, WANG Lijuan, LI Zhen, WANG Quan, LI Juan. 2025. Petrogenesis of the Mesozoic Malage complex pluton in Eastern Inner Mongolia and its enlightenment to the regional tectonic evolution. Geological Bulletin of China, 44(6): 1087-1105. doi: 10.12097/gbc.2022.06.030

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LI Mengxing, WANG Lijuan, LI Zhen, WANG Quan, LI Juan. 2025. Petrogenesis of the Mesozoic Malage complex pluton in Eastern Inner Mongolia and its enlightenment to the regional tectonic evolution. Geological Bulletin of China, 44(6): 1087-1105. doi: 10.12097/gbc.2022.06.030

Petrogenesis of the Mesozoic Malage complex pluton in Eastern Inner Mongolia and its enlightenment to the regional tectonic evolution

1.
Xi'an Center of Mineral Resources Survey, China Geological Survey, Xi'an 710100, Shaanxi, China
2.
Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, Hebei, China
3.
Shanxi Institute of Geological Survey Co., Ltd., Taiyuan 030006, Shanxi, China
4.
Shandong Yantai No.11 Middle School, Yantai 264000, Shandong, China

Fund Project: Supported by the China Geological Survey Project (No.1212010781033) and Ministry of Natural Resources Research Project (No. B201905)

More Information

Author Bio: LI Mengxing, male, born in 1985, master, senior engineer, mainly engaged in the exploration, investigation and evaluation of polymetallic ores; E−mail: 282665774@qq.com
Corresponding author: WANG Lijuan, female, born in 1981, master, senior engineer, mainly engaged in geochemical researchp; E-mail: 32737195@qq.com

Received Date: 21 June 2022

Revised Date: 09 April 2023

Publish Date: 15 June 2025

Abstract

Abstract

Objective
This study investigates the Malage composite pluton in the southern Xing'an Block to clarify the spatiotemporal influence boundaries of two tectonic systems (Mongolia−Okhotsk Ocean and Paleo−Pacific) in Northeast China.
Methods
We conducted systematic sampling of lithologic units within the pluton, followed by petrographic analysis, zircon U−Pb geochronology, and whole−rock geochemical characterization.
Results
The Malage complex pluton comprises two granite phases. The early−stage assemblage (quartz monzonite diorite, monzogranite and alkali−feldspar granite)emplaced during the Late Triassic (225 ± 1 Ma and 220 ± 2 Ma), and granite porphyry intruded in the late Early Cretaceous (124 ± 1 Ma). Both phases represent high−K calc−alkaline I−type granites, though the Cretaceous porphyry exhibits higher differentiation. They are both characterized by enrichment of large ion lithophilic elements (Rb, Ba, K) and light rare−earth elements (LREE), different degrees of loss (Ta, Nb, P, Ti) in high field strength elements (HFSE) and heavy rare−earth elements (HREE), low total rare earths (ΣREE=34.25×10⁻⁶~217.91×10⁻⁶), variable negative Eu anomalies (δEu=0.40~0.84).
Conclusions
Integrated geological evidence suggests that Late Triassic Mongolian−Okhotsk Ocean subduction influenced the southern Xing'an Block, and late Early Cretaceous magmatism occurred under an extensional regime driven jointly by post−collisional relaxation after Mongolia−Okhotsk Ocean closure and Paleo−Pacific Plate rollback, with predominant control from the latter.
- Xing'an Block /
- Mongol-Okhotsk Ocean /
- Paleo-Pacific Ocean /
- I-type granite /
- tectonic evolution

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References

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