论文部分内容阅读
浙赣皖相邻地区燕山期大茅山、铜山、里山岭、黄山、伏岭等岩体主要由黑云母花岗岩组成，其中斜长石属钠长石和富钠更长石，黑云母呈它形填隙状，结晶晚于浅色矿物。岩石化学成分富ＳｉＯ_２（７３.９２％－７７.５５％）、富碱（Ｎａ_２Ｏ＋Ｋ_２Ｏ为７.８１％～８. ６７％），贫ＣａＯ（０.２６％-０.９２％）、ＭｇＯ（０—０.４５％）；微量元素中富集Ｙ、Ｎｂ、Ｚｒ等ＨＦＳＥ，贫过渡元素及Ｓｒ、Ｂａ；稀土配分曲线呈“海鸥型”。这些特点与区内及华南Ｉ型和Ｓ型花岗岩明显不同，而具有Ａ_２型花岗岩的典型特征。
Adjacent areas of Zhejiang, Jiangxi and Anhui Yanshanian period Maoshan, Tongshan, Lixingshan, Huangshan, Fuling and other rock mainly composed of biotite granite, which plagioclase albite and sodium-rich longer rocks, biotite was its shape Gaps, crystallization later than light-colored minerals. The chemical compositions of rocks are rich in SiO_2 (73.92% -77.55%), alkali-rich (7.81% ~ 8.77% Na_2O + K_2O), CaO (0.26% -0.92% -0.45%). Trace elements were enriched in HFSE such as Y, Nb and Zr, lean transition elements and Sr and Ba. The distribution curve of rare earth elements was “seagull”. These characteristics are distinctly different from the I-type and S-type granites in the region and South China, but have the typical features of A 2 type granites.