赣西北九岭中北部早白垩世高分异S型花岗岩成矿专属性分析  

Metallogenic Specialization of Early Cretaceous Highly Fractionated S-type Granites in Middle-northern Jiuling Mountains of Northwestern Jiangxi Province

作　　者：廖圣兵[1] 褚平利[1] 段政[1] 黄文成[1] 朱延辉 舒徐洁 LIAO Shengbing;CHU Pingli;DUAN Zheng;HUANG Wencheng;ZHU Yanhui;SHU Xujie(Nanjing Geological Survey Center,China Geological Survey,Nanjing 210016,China)

机构地区：[1]中国地质调查局南京地质调查中心,南京210016

出　　处：《河南科学》2020年第1期69-74,共6页Henan Science

基　　金：中国地质调查局江南-华夏古陆区域地质矿产调查项目(12120113064800)。

摘　　要：对赣西北石门楼地区早白垩世黑云母花岗岩和二云母花岗岩开展了岩石地球化学、矿物地球化学及锆石U-Pb年代学研究.黑云母花岗岩LA-ICP-MS锆石U-Pb年龄为143.7 Ma±2.4 Ma(MSWD=0.21),属早白垩世早期.黑云母花岗岩和二云母花岗岩S(i SiO2分别为70.16%~72.78%和72.76%~73.80%)、Al、ALK、CIPW刚玉分子和Rb含量高,Ca、Sr、Ba、Ce、Zr、Y及Nb含量较低,A/CNK值、(Na2O+K2O)/CaO和Rb/Sr比值高,REE显示四分组效应,Eu/Eu^*值(分别介于0.36~0.60和0.071~0.073)中等或小,属(高)分异S型花岗岩.岩浆起源于新元古代花岗岩类源岩重熔再造作用形成,处于扬子板块与华夏板块碰撞后陆内造山挤压至伸展过渡初期,具有形成钨(钼铜)或钨(锡)矿床的成矿物质、时代及空间专属性和成矿可能性.The petrogeochemistry,mineral geochemistry and zircon U-Pb geochronology of Early Cretaceous biotite granite and two-mica granite,Shimenlou area,northwestern Jiangxi Province are studied.The weighted average age of LA-ICP-MS zircon U-Pb from the biotite granite is 143.7 Ma±2.4 Ma(MSWD=0.21),belonging to Early Cretaceous.The biotite granite and two-mica granite both contains garnet and tourmaline.The content of Si(SiO2=70.16%-72.78%and 72.76%-73.80%),Al,alkali(K),the corundum by caluculated CIPW and Rb are higher,while the content of Ca,Sr,Ba,Ce,Zr,Y and Nb are lower.Values of A/CNK,(Na2O+K2O)/CaO and Rb/Sr ratios are higher,REE appears“tetrad effect”,and values of(Eu/Eu^*)N(respectively between 0.36-0.60 and 0.071-0.073)are medium or low.All above shows the two respectively belongs to moderate and highly fractionated S-type granites.The magma is formed by remelting and regenerating of the Neoproterozoic granitoids,and it is in the early stage of extension in the intracon-tinental orogenic compression after the collision between the Yangtze plate and the Huaxia plate.It shows that biotite granite and two-mica granite has the material,age and spatial specialization and metallogenic possibility of tungsten(molybdenum-copper)or tungsten(tin)deposit.

关 键 词：赣西北 九岭 早白垩世 高分异S型花岗岩 成矿专属性 

分 类 号：P594+.1[天文地球—地球化学] P612[天文地球—地质学]