Volume 93, Issue 5 pp. 1300-1316
Original Article
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Early Permian A-type Granites in the Zhangdaqi Area, Inner Mongolia, China and Their Tectonic Implications

Li ZHANG

Li ZHANG

College of Earth Sciences, Jilin University, Changchun, 130061 China

Shenyang Institute of Geology and Mineral Resources, China Geological Survey, Shenyang, 110034 China

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Yongjiang LIU

Corresponding Author

Yongjiang LIU

Key Lab of Submarine Geoscience and Prospecting Techniques, MOE, Institute for Advanced Ocean Study, College of Marine Geosciences, Ocean University of China, Qingdao, 266100 China

Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266100 China

Corresponding author. E-mail: [email protected]Search for more papers by this author
Jun SHAO

Jun SHAO

Shenyang Institute of Geology and Mineral Resources, China Geological Survey, Shenyang, 110034 China

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Weimin LI

Weimin LI

College of Earth Sciences, Jilin University, Changchun, 130061 China

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Chenyue LIANG

Chenyue LIANG

College of Earth Sciences, Jilin University, Changchun, 130061 China

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Ruihong CHANG

Ruihong CHANG

College of Earth Sciences, Jilin University, Changchun, 130061 China

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Hongzhi YANG

Hongzhi YANG

Shenyang Institute of Geology and Mineral Resources, China Geological Survey, Shenyang, 110034 China

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Zhiqiang FENG

Zhiqiang FENG

College of Mining Engineering, Taiyuan University of Technology, Taiyuan, 030024 China

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Chao ZHANG

Chao ZHANG

Shenyang Institute of Geology and Mineral Resources, China Geological Survey, Shenyang, 110034 China

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Jia XU

Jia XU

Shenyang Institute of Geology and Mineral Resources, China Geological Survey, Shenyang, 110034 China

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Yi SHI

Yi SHI

Shenyang Institute of Geology and Mineral Resources, China Geological Survey, Shenyang, 110034 China

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Fan YANG

Fan YANG

Shenyang Institute of Geology and Mineral Resources, China Geological Survey, Shenyang, 110034 China

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Pengfei HE

Pengfei HE

Shenyang Institute of Geology and Mineral Resources, China Geological Survey, Shenyang, 110034 China

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First published: 04 October 2019
Citations: 5

About the first author:

ZHANG Li, male, born in 1987 in Qitaihe City, Heilongjiang Province, master, graduated from College of Earth Sciences, Jilin University, Changchun, engineer of Shenyang Institute of Geology and Mineral Resources, China Geological Survey, Shenyang. He is now interested in study on the evolution of the Paleo-Asian Tectonic Domain. E-mail: [email protected], Phone: 024–81847035.

About the corresponding author:

LIU Yongjiang, male, born in 1964 in Mudanjiang City, Heilongjiang Province, Doctor, professor of Key Lab of Submarine Geoscience and Prospecting Techniques, MOE, Institute for Advanced Ocean Study, College of Marine Geosciences, Ocean University of China, Qingdao. He is now interested in study on geotectology and tectonic chronology. E-mail: [email protected]. Phone: 0532–66785928.

Abstract

There is a controversy regarding the amalgamation of Xing'an and Songnen Blocks along the Hegenshan-Heihe Suture (HHS) in the eastern Central Asian Orogenic Belt (CAOB). To solve this problem, we performed detailed study on the granites from the Zhangdaqi area, adjacent to the north of the HHS in the northern part of the Great Xing'an Range, NE China. Geochemically, the granites in the study area are metaluminous-weak peraluminous and high-K calc-alkaline series. Trace elements of the granites show that LREEs are relatively enriched, while HREEs are relatively deficient and obvious REE fractionation. The granites are characterized by obvious negative Eu anomalies, meanwhile, they are relatively enriched in Rb, K, Th and depleted in Ba, Nb, Sr, P, Ti. All the geochemical features suggest that the granites in the Zhangdaqi area are aluminum A-type granites. The zircon LA-ICP-MS U-Pb ages of these granites are 294–298 Ma, indicating that they formed in the Early Permian. These granites also have positive εHf (t) values (8.4–14.2) and a relatively young two-stage model age between 449 Ma and 977 Ma, implying that the magma was derived from the re-melting of the Early Paleozoic-Neoproterozoic juvenile crust. Combined with geochemical characteristics (Nb/Ta ratios of 9.0–22.2, and Zr/Hf ratios of 52.3–152.0), we believe that the magmatic source area is a mixture of partial melting of the lower crust and depleted mantle. A-type granites and bimodal volcanic rocks along the Hegenshan-Heihe Suture formed during the Late Carboniferous-Early Permian, indicating that the HHS between Xing'an and Songnen Blocks closed in the late Early-Carboniferous. Subsequently, the Zhangdaqi area was in a post-orogenic extensional environment from Late Carboniferous to Early Permian and resulted in the formation of the A-type granites.

 

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