40Ar/39Ar ages of Quaternary volcanic rocks from the midwest of the Leizhou Peninsula, and their geologic significance
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摘要:
雷州半岛地区第四纪火山岩广泛分布，但对火山岩形成的时代还存在争议。文章利用高精度的激光阶段加热40Ar/39Ar法对雷州半岛中西部火山岩的年龄进行了测定，并结合与相邻地层的接触关系，划分了2个火山活动旋回。第Ⅰ旋回火山岩呈夹层产于湛江组内部，仅见于钻孔ZKC12中，岩性为橄榄拉斑玄武岩；第Ⅱ旋回火山岩在区内分布最广，覆盖在湛江组之上，40Ar/39Ar年龄为2.02～0.88 Ma，时代为早更新世早期至早更新世晚期，结合与周围地层的接触关系，进一步划分为4个喷发期。第1喷发期（Ⅱ1）规模最大，出露面积最广，形成2个喷发中心，40Ar/39Ar年龄为2.02±0.03 Ma；第2喷发期（Ⅱ2）主要分布于锅盖岭和北插一带，40Ar/39Ar年龄分别为1.77±0.03 Ma、1.70±0.03 Ma；第3喷发期（Ⅱ3）喷发中心位于火炬农场，40Ar/39Ar年龄为1.51±0.07 Ma；第4喷发期（Ⅱ4）岩性以沿裂隙喷发形成的溢流相的玄武质熔岩为主， 40Ar/39Ar年龄为0.88±0.14 Ma。火山活动明显受北东向和北西向基底断裂的控制。研究成果为雷州半岛地区火山活动时代、期次和活动规律研究提供了重要年龄证据。
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.
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Key words:
- volcanic rocks /
- 40Ar/39Ar method /
- volcanic cycles /
- Quaternary /
- Leizhou Peninsula /
- geochronology
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表 1 雷州半岛中西部火山活动旋回划分表
Table 1. Division of volcanic eruption cycles in the midwest of the Leizhou Peninsula
地质年代 旋回 喷发期 产出层位 累计厚度/m 出露面
积/km2主要岩性 火山岩相 同位素
年龄/Ma纪 世 第四纪 更新世 Ⅱ Ⅱ4 石峁岭组 >4 .0m 4.1 橄榄拉斑玄武岩 溢流相 0.88 Ⅱ3 >200.0 m 10.8 石英拉斑玄武岩 溢流相 1.51 Ⅱ2 >101.4 m 34.3 石英拉斑玄武岩、
火山碎屑岩溢流相爆发相 1.70～1.77 Ⅱ1 >33.5 m 126.1 石英拉斑玄武岩、
火山碎屑岩溢流相爆发相 2.02 Ⅰ 湛江组 >7.4 m 无出露 橄榄拉斑玄武岩 溢流相 
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