<sup>40</sup>Ar/<sup>39</sup>Ar ages of Quaternary volcanic rocks from the midwest of the Leizhou Peninsula, and their geologic significance

LI Xiang; ZHANG Zongyan; LI Haiyong; ZHANG Jianyu; BAI Xiujuan

doi:10.12090/j.issn.1006-6616.2023098

Volume 29 Issue 4

Aug. 2023

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LI X，ZHANG Z Y，LI H Y，et al.，2023. 40Ar/39Ar ages of Quaternary volcanic rocks from the midwest of the Leizhou Peninsula, and their geologic significance[J]. Journal of Geomechanics，29（4）：512−521 doi: 10.12090/j.issn.1006-6616.2023098

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LI X，ZHANG Z Y，LI H Y，et al.，2023. ⁴⁰Ar/³⁹Ar ages of Quaternary volcanic rocks from the midwest of the Leizhou Peninsula, and their geologic significance[J]. Journal of Geomechanics，29（4）：512−521 doi: 10.12090/j.issn.1006-6616.2023098

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⁴⁰Ar/³⁹Ar ages of Quaternary volcanic rocks from the midwest of the Leizhou Peninsula, and their geologic significance

doi: 10.12090/j.issn.1006-6616.2023098

LI Xiang^{1, 2
,},
ZHANG Zongyan^{1, 2},
LI Haiyong^{3, 4
,
,},
ZHANG Jianyu¹,
BAI Xiujuan⁵

1.
Wuhan Center of China Geological Survey, Wuhan 430205, Hubei, China
2.
Research Center of Granitic Diagenesis and Mineralization, China Geological Survey, Wuhan 430205, Hubei, China
3.
South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 511458, Guangdong, China
4.
Key Laboratory of Ocean and Marginal Sea Geology, Guangzhou 511458, Guangdong, China
5.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences(Wuhan), Wuhan 430074, Hubei, China

Funds: This research is financially supported by the Geological Survey Project of the China Geological Survey (Grants DD20230204, DD20221634, and DD20160035), the Zhuhai Urban Geological Survey (including information) Project (Grant MZCD-2201-008), the Guangdong Basic and Applied Basic Research Foundation (Grant 2019A1515011244), the Guangzhou Basic and Applied Basic Research Fund (Grant 202201010720), and the National Natural Science Foundation of China (Grant No. 91958212).

More Information

Received: 2023-06-14
Revised: 2023-07-05
Accepted: 2023-07-17

Abstract

Abstract

Quaternary volcanic rocks are widely distributed in the Leizhou Peninsula, but the age of volcanic formation remains controversial. This study used the high-precision laser stepwise heating 40Ar/39Ar method to date the age of volcanic samples from the midwest of the Leizhou Peninsula, and two volcanic cycles were determined by combining the contact relationship with the neighboring strata. Volcanic rocks of the first cycle (Ⅰ) occur as interlayers in the Zhanjiang Formation, only seen in Borehole ZKC12, and the lithology is olivine tholeiite; volcanic rocks of the second cycle (Ⅱ) are the most widely distributed in the study area, unconformably overlaying on the Zhanjiang Formation, with ⁴⁰Ar/³⁹Ar ages ranging from 2.02 to 0.88 Ma, indicating that they were erupted from the early stage of the early Pleistocene to the end of the early Pleistocene. On the combination of contact relationship with surrounding strata, the second cycle can be further divided into four eruption stages. The first eruption stage (Ⅱ₁) has the largest scale and the most extensive area, forming two eruption centers with ⁴⁰Ar/³⁹Ar age of 2.02±0.03 Ma. The second eruption stage (Ⅱ₂) centers in the areas of Guokailing and Beicha with 40Ar/39Ar ages of 1.77±0.03 Ma and 1.70±0.03 Ma, respectively. The eruptional center of the third eruption stage (Ⅱ₃) lies at Huoju Farm, and the age of ⁴⁰Ar/³⁹Ar is 1.51±0.07 Ma. The lithology of the fourth eruption stage (Ⅱ₄) is dominated by basaltic lava of overflow phase formed by fissure eruption, and the ⁴⁰Ar/³⁹Ar age is 0.88±0.14 Ma. The volcanic activity is obviously controlled by NE-trending and NW-trending basement faults. These results provide reliable age data to constrain Leizhou Peninsula’s forming age, eruption periods, and the law of volcanic activity.
- volcanic rocks,
- ⁴⁰Ar/³⁹Ar method,
- volcanic cycles,
- Quaternary,
- Leizhou Peninsula,
- geochronology

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