CAJ | 학술논문

对大水地区印支晚期忠格扎拉岩体、忠曲岩体、格尔括合岩体的岩石学、岩石地球化学特征研究得出，SiO2含量为58.40%～63.95%，大于56%；A12O3含量为15.18%～16.66%，大于15%；MgO 含量为1.31%～2.91%，小于3%；Sr 含量为1410×10-6~576×10-6，大于400×10-6；Y 含量为12.2×10-6～15.3×10-6，小于18×10-6；Sr/Y 比值42.57～85.52，大于40；(La/Yb)N比值为19.38~35.97，大于10，与典型埃达克岩特征基本一致。表明它们来自于基性下地壳部分熔融，埃达克岩的高温和高压萃取了大量Au元素，形成富金含矿热液，并沿构造通道上升沉积于三叠纪地层中，形成大水金矿田。
대대수지구인지만기충격찰랍암체、충곡암체、격이괄합암체적암석학、암석지구화학특정연구득출，SiO2함량위58.40%～63.95%，대우56%；A12O3함량위15.18%～16.66%，대우15%；MgO 함량위1.31%～2.91%，소우3%；Sr 함량위1410×10-6~576×10-6，대우400×10-6；Y 함량위12.2×10-6～15.3×10-6，소우18×10-6；Sr/Y 비치42.57～85.52，대우40；(La/Yb)N비치위19.38~35.97，대우10，여전형애체극암특정기본일치。표명타문래자우기성하지각부분용융，애체극암적고온화고압췌취료대량Au원소，형성부금함광열액，병연구조통도상승침적우삼첩기지층중，형성대수금광전。
Study the petrology,geochemistry characteristics of the Zhonggezhala rock,Zhongqu rock and Geerkuohe rock which were become in the late indo-Chinese epoch. SiO2 content is 58.40%~63.95%>56%;A12O3 content is 15.18%~16.66%>15%;MgO content 1.31%~2.91%<3%;Sr content 1410×10-6~576×10-6>400×10-6;Y content is 12.2×10-6~15.3× 10- 6 <18×10- 6;Sr/Y ratio is 42.57~85.52>40; (La/Yb)N ratio is 19.38~35.97>10.They have the same characteristics with the typical adakite ones that suggests they come from the situation of partial melting of under-crust.The adakite rock have high temperature and high pressure which can extracte a large amount of Au element and they form a abundence ore-bearing hydrothermal, rising along the tectonic channel deposition to the Triassic strata,formed the Dashui gold ore field.