| 刘俊辰,李富强,安玉伟.吉南集安—临江一带碱长花岗岩元素地球化学特征、岩石成因与地球动力学背景[J].矿产勘查,2025,16(10):2249-2261 |
| 吉南集安—临江一带碱长花岗岩元素地球化学特征、岩石成因与地球动力学背景 |
| Elemental geochemical characteristics, petrogenesis and geodynamic background of alkali-feldspar granite in the Ji'an-Linjiang Area of Southern Jilin |
| 投稿时间：2025-04-21 |
| DOI：10.20008/j.kckc.202510003 |
| 中文关键词: 碱长花岗岩 锆石 U-Pb年龄 岩石地球化学 鸭绿江断裂带 吉林 |
| 英文关键词: alkali-feldspar granite zircon U-Pb age geochemistry Yalu River Fault Zone Jilin Province |
| 基金项目:本文受吉林省有色金属地质勘查局科研项目(JL—JN2018013)资助。 |
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| 中文摘要: |
| 吉南集安—临江一带碱长花岗岩大地构造位置位于中亚造山带东缘，滨太平洋构造域西侧，中国东部陆缘岩浆弧北段辽吉裂谷带。为探讨集安—临江一带碱长花岗岩岩体成岩时代及成因、是否为同期同阶段岩浆活动的产物，对集安—临江一带碱长花岗岩岩体进行了系统的岩相学、地球化学和年代学研究。LA-ICP-MS锆石 U-Pb加权平均年龄分布范围 122.4~106.9 Ma，侵位时代为早白垩世晚期。岩体整体形成时间控制在 16 Ma之内，岩体形成时间间隔较短，且构造、岩性、成岩时期皆相近，稀土元素配分曲线匹配较好，稀土元素配分模式一致，指示出吉南集安—临江一带碱长花岗岩为燕山晚期同期同阶段岩浆活动的产物。集安—临江一带碱长花岗岩岩体富硅、钾，贫铝、钠、钙、铁、镁，属于富 SiO2的碱性-强过铝质花岗岩；具有轻稀土元素富集、重稀土元素亏损的特点。集安—临江一带碱长花岗岩岩体呈现富集大离子亲石元素(Rb、K等元素)明显亏损 Sr、Ti的特征。综合岩相学、年代学和地球化学特征，吉南集安—临江一带碱长花岗岩属于 A1型非，造山带的 A型花岗岩，形成与鸭绿江断裂带在中生代晚期早白垩世发生走滑断 |
| 英文摘要: |
| The alkali-feldspar granite in the Ji'an-Linjiang area of southern Jilin is located on the eastern mar.gin of the Central Asian Orogenic Belt, on the western side of the Pacific Rim tectonic domain, and in the Liaoji RiftZone in the northern segment of the magmatic arc along the eastern continental margin of China. In order to explorethe emplacement age and origin of the alkali-feldspar granite plutons in the Ji'an-Linjiang area, and to determinewhether they are the products of magmatic activities in the same period and stage, a systematic study of petrography,geochemistry and chronology of the alkali-feldspar granite plutons in the Ji'an-Linjiang area was carried out. Theweighted average ages of LA-ICP-MS zircon U-Pb range from 122.4 Ma to 106.9 Ma, and the emplacement age isthe late Early Cretaceous. The overall formation time of the plutons is controlled within 16 Ma, and the time intervalof pluton formation is short. Moreover, the structures, lithologies and diagenetic periods are all similar, the rareearth element distribution curves match well, and the rare earth element distribution patterns are consistent, indicat.ing that the alkali-feldspar granite in the Ji'an-Linjiang area of southern Jilin is the product of magmatic activitiesin the same period and stage in the late Yanshanian period. The alkali-feldspar granite plutons in the Ji'an-Linjiang area are rich in silicon and potassium, and poor in aluminum, sodium, calcium, iron and magnesium, be.longing to the alkaline-strongly peraluminous granite rich in SiO2. They are characterized by the enrichment of lightrare earth elements and the depletion of heavy rare earth elements. The alkali-feldspar granite plutons in the Ji'an-Linjiang area show the characteristics of enrichment in large ion lithophile elements (such as Rb, K and other ele.ments), and obvious depletion of Sr and Ti. Combining the characteristics of petrography, chronology and geochemis.try, the alkali-feldspar granite in the Ji'an-Linjiang area of southern Jilin belongs to A-type granite in A1 type non-orogenic zones, and its formation is related to the strike-slip fault activity of the Yalu River Fault Zone in the EarlyCretaceousof the Late Mesozoic, and it is a manifestation of magmatic activity in the southern Jilin region under theextensional geodynamic background of the Early Cretaceous. |
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