Zircon U-Pb Geochronology and Its Geological Significance of the Basic Volcanic Rocks from the Li'eryu Formation, Liaohe Group in Kuandian Area, Liaoning Province
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摘要: 辽东古元古代构造带内辽河群的形成时代及其演化一直是学者研究的热点.本文对宽甸地区里尔峪组变沉积岩夹层的基性火山岩进行锆石LA-ICP-MS U-Pb年代学研究.7件基性火山岩样品的锆石分为岩浆锆石和变质锆石.测年结果显示代表岩石成岩年龄的岩浆活动有2期：2 150~2 130 Ma、2 050~2 020 Ma，结合本区出露的酸性火山岩，表明宽甸地区辽河群形成时代至少处于2.17~2.03 Ga.获得的5件斜长角闪岩变质年龄显示变质作用发生在1 900 Ma以后，持续时间比较长为1 870~1 780 Ma；进一步可分为3个阶段1 870~1 861 Ma、1 845~1 842 Ma、1 790~1 780 Ma，变质作用峰期为~1 850 Ma，属于本区古元古代第2个强烈的变质峰期，第3阶段与~1 800 Ma左右的变质事件一致.变质闪长岩（D015）脉体形成时代为1 314±24 Ma，斜长角闪岩（D1465-1）变质年龄为1 290±21 Ma，这是首次在辽东地区识别出中元古代岩浆和变质事件，结合辽西和冀北地区1 320~1 380 Ma岩浆活动，认为这些事件是华北板块对Columbia超大陆的裂解过程的响应.Abstract: The formation age and evolution of the Liaohe Group in the Liao-Ji Paleoproterozoic structural belt have always been a research hotspot. Zircon LA-ICP-MS U-Pb geochronology of basic volcanic rocks intercalated in metamorphic sedimentary rocks of the Li'eryu Formation in Kuandian area is studied. Zircons from seven basic magmatic rocks are divided into magmatic zircons and metamorphic zircons. The dating results show two stages of 2 150－2 130 Ma and 2 050－2 020 Ma, representing the diagenetic age of the rocks. Combined with the acid volcanic rocks exposed in this area, it is considered that the formation age of the Liaohe Group in Kuandian area is at least 2.17－2.03 Ga. The metamorphic ages obtained from five amphibolites show that the metamorphism occurred after 1 900 Ma and lasted from 1 870 to 1 780 Ma, which can be further divided into three phases: 1 870－1 861 Ma, 1 845－1 842 Ma and 1 790－1 780 Ma. The peak period of metamorphism is ~1 850 Ma, which is the second strong metamorphic peak period of Paleoproterozoic in this area. The third stage is consistent with the metamorphic event of ~1 800 Ma. The age of meta diorite (D015) vein is 1 314±24 Ma and metamorphic age of amphibolite (D1465-1) is 1 290±21 Ma. This is the first time that Mesoproterozoic magma and metamorphism events have been identified in eastern Liaoning. Combined with 1 320－1 380 Ma magmatic activity in western Liaoning and northern Hebei, these events are considered as the response of North China Craton to the breakup process of Columbia supercontinent.
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Key words:
- Liaohe Group /
- Li'eryu Formation /
- basic volcanic rocks /
- zircon U-Pb chronology /
- petrology
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图 1 研究区构造位置（a）、地质简图及采样位置（b）
1.中生代地层；2.古生代地层；3.青白口系；4.辽河群；5.早白垩世二长花岗岩；6.中三叠世花岗闪长岩；7.古元古代弱片麻状花岗岩；8.古元古代基性岩体；9.正断层；10.逆断层；11.走滑断层；12.采样点及样品号；13.县；14.乡镇；15.第四系
Fig. 1. The tectonic location (a), simplified geological map and samples location (b)
图 2 宽甸地区斜长角闪岩野外照片及显微照片
a. D016斜长角闪岩野外产状；b. D018斜长角闪岩野外产状；c. D014斜长角闪岩野外产状；d. D019斜长角闪岩野外产状；e. D014斜长角闪岩显微特征；f. D016斜长角闪岩显微特征；g. D018斜长角闪岩显微特征；h. D1463-1斜长角闪岩显微特征；i. D015变质闪长岩显微特征
Fig. 2. Field photographs and photomicrographs of the amphibolite in Kuandian
图 3 宽甸地区里尔峪组基性火山岩部分锆石阴极发光图像
Fig. 3. CL images of the selected zircons of basic volcanic rocks from the Li'eryu Formation in Kuandian area
图 4 宽甸地区里尔峪组基性火山岩锆石稀土元素球粒陨石标准化图解
Fig. 4. Chondrite-normalized REE distribution diagrams for different zircons from basic volcanic rocks from the Li'eryu Formation in Kuandian area
图 5 宽甸地区里尔峪组基性火山岩锆石U-Pb年龄谐和图
Fig. 5. Zircons U-Pb ages of basic volcanic rocks from the Li'eryu Formation in Kuandian area
表 1 宽甸地区同位素采集点及岩性
Table 1. Isotope collection point and lithology of samples in Kuandian area
样品号 采样层位 岩性 采样位置 D014 里尔峪组 斜长角闪岩 E124°55′53″, N40°39′13″ D015 里尔峪组 变质闪长岩 E124°57′6.5″, N40°38′51.4″ D016 里尔峪组 斜长角闪岩 E124°55′21.2″, N40°46′40.9″ D018 里尔峪组 斜长角闪岩 E124°58′43.8″, N40°47′12.8″ D019 里尔峪组 斜长角闪岩 E124°58′14.9″, N40°47′22.5″ D1463-1 里尔峪组 含磁铁透辉斜长角闪岩 E125°14′6.5″, N40°46′21.7″ D1465-1 里尔峪组 含磁铁透辉斜长角闪岩 E125°16′2.4″, N40°45′7.8″ 
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