CAJ | 학술논문

利用现代同位素年代学的技术方法，按照一定的比例尺和统一的技术要求，测定某一区域内地质体的同位素年龄，在地质图上清晰地表达相关地质体的时空分布格局，为深入研究区域地质演化规律和地质找矿工作提供依据，这是当前同位素年代学填图的主要工作。本次研究采用单颗粒锆石SHRIMP和LA-MC-ICPMS定年方法，尝试性地对南岭东段北部9个1∶20万图幅(井冈山幅、兴国幅、宁化幅、赣州幅、于都幅、长汀幅、龙南幅、寻乌幅和上杭幅)范围内代表性的上百个岩体样品进行了锆石U-Pb年代学研究，修正了原先由于缺少准确的年龄数据而误判的岩体时代，进而对各岩体的侵位时代进行了重新厘定，这对于深入研究该区域地质演化历史和成岩成矿规律具有重要的现实意义。本文也指出了同位素年代学填图工作中对样品布置采集、数据合理使用的基本要求以及综合分析在解释区域岩浆岩成因与地质演化方面的重要性。
이용현대동위소년대학적기술방법，안조일정적비례척화통일적기술요구，측정모일구역내지질체적동위소년령，재지질도상청석지표체상관지질체적시공분포격국，위심입연구구역지질연화규률화지질조광공작제공의거，저시당전동위소년대학전도적주요공작。본차연구채용단과립고석SHRIMP화LA-MC-ICPMS정년방법，상시성지대남령동단북부9개1∶20만도폭(정강산폭、흥국폭、저화폭、공주폭、우도폭、장정폭、룡남폭、심오폭화상항폭)범위내대표성적상백개암체양품진행료고석U-Pb년대학연구，수정료원선유우결소준학적년령수거이오판적암체시대，진이대각암체적침위시대진행료중신전정，저대우심입연구해구역지질연화역사화성암성광규률구유중요적현실의의。본문야지출료동위소년대학전도공작중대양품포치채집、수거합리사용적기본요구이급종합분석재해석구역암장암성인여지질연화방면적중요성。
The main objective of the geochronological mapping underway is, using modern geochronological technology, according to certain scale and unified technical requirements, determining the isotope ages of geologic bodies in a certain region, and expressing spatial and temporal distribution of geologic bodies in the geological maps clearly, and then providing the basis for further study of the regional geological evolution and metallogeny. In this paper, we present the progress of our tentative geochrological mapping of the igneous rocks in the northeastern part of the Nanling region, China. The study region includes nine map units in 1∶200000 scale (Jinggangshan, Xinggguo, Ninghua, Ganzhou, Yudu, Changting, Longnan, Xunwu and Shanghang). Using SHRIMP and LA-MC-ICPMS methods, we conducted U-Pb dating on more than 2000 grains of zircons from about 100 typical intrusions in this region, revised many misjudged ages of the rock bodies and re-determined their emplacement age. This work has important practical significance on further study of geological evolution and metallogeny of the region. Meanwhile, we pointed out some basic requirements of sampling and reasonable using of the data in geochronological mapping work, and indicated the importance of comprehensive analysis of the petrogenesis of the regional magmatic rocks and geological evolution.