CAJ | 학술논문

华南中部地区大义山、塔山等早中生代花岗岩的展布和侵入特征与这一时期褶皱构造之间存在着非常密切的关系,对这些岩体进行精确年代学研究,可以为构造变形时代提供年代学约束。大义山岩体南部地区锆石U-Pb LA-ICP-MS年龄为东缘(171.8±1.9) Ma、西缘(169.9±1.8) Ma、中部(164.2±2.6) Ma,塔山岩体东段为(247±5.9) Ma。大义山岩体在164.2—171.8 Ma之间经历两个期次的侵入,形成了一个复式岩体,岩体形成后至125 Ma经历了快速隆升,之后以接近1°C/Ma的冷却速率抬升到地表。大义山和塔山岩体记录了华南早中生代印支和燕山两期重要的岩浆活动。阳明山、塔山岩体等E—W向展布岩体受印支期构造带控制；大义山、骑田岭等岩体年龄限定了燕山期构造地层的变形下限时代,华南地区NNE向褶皱构造形成时代应早于(171.8±1.9) Ma。
화남중부지구대의산、탑산등조중생대화강암적전포화침입특정여저일시기습추구조지간존재착비상밀절적관계,대저사암체진행정학년대학연구,가이위구조변형시대제공년대학약속。대의산암체남부지구고석U-Pb LA-ICP-MS년령위동연(171.8±1.9) Ma、서연(169.9±1.8) Ma、중부(164.2±2.6) Ma,탑산암체동단위(247±5.9) Ma。대의산암체재164.2—171.8 Ma지간경력량개기차적침입,형성료일개복식암체,암체형성후지125 Ma경력료쾌속륭승,지후이접근1°C/Ma적냉각속솔태승도지표。대의산화탑산암체기록료화남조중생대인지화연산량기중요적암장활동。양명산、탑산암체등E—W향전포암체수인지기구조대공제；대의산、기전령등암체년령한정료연산기구조지층적변형하한시대,화남지구NNE향습추구조형성시대응조우(171.8±1.9) Ma。
The distribution and intrusion of Early Mesozoic granites in central South China such as Dayishan pluton and Tashan pluton are closely related to folded structure in this region. Precise chronologic studies can constrain the age of the tectonic deformation. This paper report zircon U-Pb LA-ICP-MS ages of the southern part of Dayishan pluton based on dating of 3 samples:the age of the eastern margin is (171.8±1.9) Ma, that of the western margin is (169.9±1.8) Ma and that of the central part is (164.2±2.6) Ma. The zircon U-Pb LA-ICP-MS age of the eastern part of Tashan pluton is (247±5.9) Ma. Dayishan pluton experienced two phases of intrusion between 164.2 and 171.8 Ma and formed a composite pluton;after that, it experienced rapid uplift prior to 125 Ma, and then it was rapidly raised to the surface at the cooling rate of 1°C/Ma. Dayishan pluton and Tashan pluton recorded Indosinian and Yanshanian magmatic activities. The EW-trending structural zone controlled Indosinian granites, such as Yangmingshan and Tashan; the ages of Dayishan and Qitianling plutons constrain the Yanshanian tectonic deformation, and the formation of the NNE-trending folds in South China should be earlier than (171.8±1.9) Ma.