CAJ | 학술논문

金刚台组火山岩是北淮阳中生代火山岩带的重要组成部分。本文选取金刚台组流纹英安岩、英安岩和安山岩，用LA-ICP-MS锆石U-Pb法进行年龄测定，结果显示，上述样品的成岩年龄分别为127.5±0.6 Ma、124.8±2.3 Ma和123.3±0.7 Ma。表明金刚台组火山岩形成于早白垩世，晚于商城岩体。北淮阳地区火山岩年龄统计结果表明，该地区火山岩形成年龄相似，均在133.1~122 Ma。通过地层对比，发现北淮阳地区早白垩世发育的大面积火山岩在火山活动类型和岩石组合成岩年龄等方面都十分一致，火山活动以中心式喷发为主，范围绵延整个北淮阳地区，形成了北淮阳地区早白垩世火山岩带，从西到东不存在时间上的先后关系，但火山岩的酸性程度逐渐降低，暗示其岩浆源区逐渐变深、地幔物质的参与逐渐增多。
금강태조화산암시북회양중생대화산암대적중요조성부분。본문선취금강태조류문영안암、영안암화안산암，용LA-ICP-MS고석U-Pb법진행년령측정，결과현시，상술양품적성암년령분별위127.5±0.6 Ma、124.8±2.3 Ma화123.3±0.7 Ma。표명금강태조화산암형성우조백성세，만우상성암체。북회양지구화산암년령통계결과표명，해지구화산암형성년령상사，균재133.1~122 Ma。통과지층대비，발현북회양지구조백성세발육적대면적화산암재화산활동류형화암석조합성암년령등방면도십분일치，화산활동이중심식분발위주，범위면연정개북회양지구，형성료북회양지구조백성세화산암대，종서도동불존재시간상적선후관계，단화산암적산성정도축점강저，암시기암장원구축점변심、지만물질적삼여축점증다。
Volcanic rocks of the Jingangtai Formation are important part of the Beihuaiyang Mesozoic volcanic rock belt. Rhyodacite, dacite, and andesite samples were selected from the Jingangtai Formation for LA-ICP-MS zircon U-Pb dating. The results show that they were formed at 127.5±0.6 Ma, 124.8±2.3 Ma and 123.3±0.7 Ma, respectively, suggesting that volcanic rocks of the Jingangtai Formation were formed in the early Cretaceous. Combined with previously published data of the other volcanic rocks from the Beihuaiyang region, we found that volcanic rocks from this region all formed between 133.1 Ma and 122 Ma. The widely distributed volcanic rocks from the Beihuaiyang region were comparable in the types of volcanic activities, rock assemblages and ages through stratigraphic comparison, implying that a large-scale volcanic activity in the early Cretaceous in the region. The volcanic activity was mainly of central vent eruption, which formed the Beihuaiyang volcanic rock belt. These volcanic rocks become less felsic eastward, indicating increased mantle material input and gradually deeper magma sources.