CAJ | 학술논문

天目山盆地是下扬子江南隆起带保存较完整的中生代火山盆地，中生代火山岩系岩性自下而上主要为流纹岩-英安岩-安山岩。对盆地内黄尖组下段流纹岩和英安岩分别进行了锆石 LA-ICP MS定年，分别获得了133．6±1．5 Ma（MSWD＝0．73）和135．0±2．1 Ma（MSWD＝0．78）的锆石U-Pb年龄，指示天目山盆地黄尖组火山岩时代为早白垩世。天目山盆地火山活动起始时间和长江中下游地区晚中生代火山活动基本一致，说明江南隆起带和长江中下游地区在早白垩世均处于强烈拉张环境。
천목산분지시하양자강남륭기대보존교완정적중생대화산분지，중생대화산암계암성자하이상주요위류문암-영안암-안산암。대분지내황첨조하단류문암화영안암분별진행료고석 LA-ICP MS정년，분별획득료133．6±1．5 Ma（MSWD＝0．73）화135．0±2．1 Ma（MSWD＝0．78）적고석U-Pb년령，지시천목산분지황첨조화산암시대위조백성세。천목산분지화산활동기시시간화장강중하유지구만중생대화산활동기본일치，설명강남륭기대화장강중하유지구재조백성세균처우강렬랍장배경。
Tianmushan basin is a relatively well preserved Mesozoic volcanic basin in Jiangnan uplift of the Lower Yangtze region .The rock types of Mesozoic volcanic rock series are mainly rhyolite ,dacite and andesite from below .Zircon LA-ICP-MS U-Pb isotopic dating of the rhyolite and dacite from the lower part of Huangjian Formation gives ages of 133 .6 ± 1 .7 Ma (MSWD=0 .73) and 135 .0 ± 2 .1 Ma (MSWD=0 .78) ,respectively ,indicating that the age of volcanic rocks of the Huangjian Formation in the Tianmush-an basin is early Cretaceous .The starting time of volcanic eruption in the Tianmushan basin was consistent with those in volcanic basins in the middle-lower reaches of the Yangtze River ,suggesting that the Jiang-nan uplift and the middle-lower reaches of the Yangtze River were in a similar tectonic setting during early Cretaceous .