CAJ | 학술논문

以南秦岭造山带南缘与扬子克拉通接壤区开展的1∶5万区域地质调查于房县石垭子发现的花岗斑岩侵入体，通过岩体野外地质学特征、岩石地球化学特征、同位素地球化学与年代学特征研究，对该岩体形成的岩浆成因与构造环境进行了探讨。采用锆石U－Pb同位素测试分析，取得其206 Pb／238 U加权平均年龄为（722．9±6） Ma，明确岩体形成于晋宁期；并根据岩石地球化学特征，提出该花岗斑岩形成为裂谷构造环境，深化了南秦岭造山带构造—岩浆—热事件研究程度。
이남진령조산대남연여양자극랍통접양구개전적1∶5만구역지질조사우방현석오자발현적화강반암침입체，통과암체야외지질학특정、암석지구화학특정、동위소지구화학여년대학특정연구，대해암체형성적암장성인여구조배경진행료탐토。채용고석U－Pb동위소측시분석，취득기206 Pb／238 U가권평균년령위（722．9±6） Ma，명학암체형성우진저기；병근거암석지구화학특정，제출해화강반암형성위렬곡구조배경，심화료남진령조산대구조—암장—열사건연구정도。
In contiguous area of the south Qinling orogenic belt and Yangtze craton ,the authors did the regional geolog-ical survey on the scale 1∶50 000 and then ,the granitoid intrusion was discovered in Shiyazi of Fang County .By the way of the characters of the field geology of rock body ,and the geochemical characters of the rock ,and geochemical isotopic study with geochronological characters , the magmatic origin and tectonic environment of the rocks formation was dis-cussed.By means of the zircon U-Pb isotopic method,the weighted mean 206Pb/238U age is reported in this paper,which is 722.9 ±6 Ma,it was indicated the rocks formed in the Jinningian movement .According to the geochemical characters of the rock,the granite porphyry might be formed in rift valley ,which deepen the research tectonic-thermal event in the South Qinling orogenic belt .