Discovery and geological implications of Neoproterozoic metagranite in Jiaozhou Bay

DONG Jie; ZHU Xiaoqing; DOU Yanguang; SONG Weiyu; XUE Biying; ZOU Liang

doi:10.16562/j.cnki.0256-1492.2023031002

2024 Vol. 44, No. 6

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Article navigation > Marine Geology & Quaternary Geology > 2024 > 44(6): 163-174

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DONG Jie, ZHU Xiaoqing, DOU Yanguang, SONG Weiyu, XUE Biying, ZOU Liang. Discovery and geological implications of Neoproterozoic metagranite in Jiaozhou Bay[J]. Marine Geology & Quaternary Geology, 2024, 44(6): 163-174. doi: 10.16562/j.cnki.0256-1492.2023031002

Citation:

DONG Jie, ZHU Xiaoqing, DOU Yanguang, SONG Weiyu, XUE Biying, ZOU Liang. Discovery and geological implications of Neoproterozoic metagranite in Jiaozhou Bay[J]. Marine Geology & Quaternary Geology, 2024, 44(6): 163-174. doi: 10.16562/j.cnki.0256-1492.2023031002

Discovery and geological implications of Neoproterozoic metagranite in Jiaozhou Bay

1.
Key Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources China, Qingdao 266101, China
2.
Qingdao Geo-Engineering Surveying Institute, Qingdao 266101, China
3.
Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266237, China

More Information

Corresponding author: ZHU Xiaoqing, xq_zhu0819@126.com

Received Date: 10 March 2023

Revised Date: 28 February 2024

Publish Date: 28 December 2024

Abstract

Abstract

Jiaozhou Bay is a semi-enclosed bay in Qingdao City in Shandong Peninsula, East China. Understanding the main geological frame of the basement rocks in the bay is crucial for large engineering projects and future urban planning in Qingdao. In this study, Neoproterozoic metamorphic granites (ca. 772 Ma) was discovered for the first time from drilling cores in Jiaozhou Bay .The basement rock is contemporaneous with Neoproterozoic granites that widely distributed in the Sulu orogenic belt. The lower part of the Neoproterozoic metamorphic granites in drilling cores was intruded by Early Cretaceous granites in age of ca. 120 Ma, which is consistent with the ages of adjacent Laoshan granites. The trace element distribution patterns of zircons in the Early Cretaceous granites and Neoproterozoic metamorphic granites in the drilling cores of Jiaozhou Bay are similar but showing a narrower range. The Early Cretaceous granite magma in the Jiaozhou Bay area might be derived from the remelting of Neoproterozoic granitic rocks. The crystallization temperatures of the Neoproterozoic metamorphic granites and Early Cretaceous granites determined by using zircon-Ti thermometer are both higher than 750°C, indicating that the source magma were water-undersaturated. This results suggest that the dynamic mechanisms of the two magmatic events may not be related to the oceanic subduction-related "Big mantle wedge" model.
- Neoproterozoic metagranite /
- early Cretaceous granite /
- basement rocks /
- Jiaozhou Bay

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References

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