| 安徽栏杆含金刚石基性岩中石榴子石矿物学特征 |
| |
| 引用本文： | 蔡逸涛,张洁,康丛轩,杨献忠,曹正琦,董钟斗,马玉广,施建斌.安徽栏杆含金刚石基性岩中石榴子石矿物学特征[J].地质通报,2019,38(1):110-120. |
| |
| 作者姓名： | 蔡逸涛 张洁 康丛轩 杨献忠 曹正琦 董钟斗 马玉广 施建斌 |
| |
| 作者单位： | 中国地质调查局南京地质调查中心, 江苏 南京 210016,中国地质调查局南京地质调查中心, 江苏 南京 210016,中国地质调查局南京地质调查中心, 江苏 南京 210016,中国地质调查局南京地质调查中心, 江苏 南京 210016,湖北省地质调查院, 湖北 武汉 430034,安徽省地勘局第二水文地质工程勘察院, 安徽 芜湖 241000,安徽省地勘局第二水文地质工程勘察院, 安徽 芜湖 241000,江苏省地质矿产局第五地质大队, 江苏 徐州 221004 |
| |
| 基金项目： | 国家自然科学基金青年科学基金项目《安徽栏杆含金刚石母岩及金刚石矿床指示矿物特征研究》（批准号：41402075）和中国地质调查局项目《安徽栏杆金刚石成矿规律与苏皖地区金刚石找矿靶区优选》（编号：12120114054301）、《华北和扬子地区金刚石矿产调查》（编号：DD20160059） |
| |
| 摘 要： | 在中国东部皖北地区分布着新元古代镁铁质岩,其中一些碱性基性岩为金刚石的赋矿岩石。为了确定安徽栏杆金刚石矿区的石榴子石种类,对矿区内不同类型的石榴子石进行系统采样,测定了62件石榴子石微区化学成分。结果显示,安徽栏杆石榴子石矿物化学式A_3~(2+)B_2~(3+)(SiO_4)_3中的A组阳离子由Mg~(2+)、Fe~(2+)和Ca~(2+)离子占位,B主要由Al~(3+)、Fe~(3+)、Mn~(3+)和Cr~(3+)离子占位,三价阳离子主要为Al~(3+),二价阳离子主要为Ca~(2+),表明研究区石榴子石主要为钙铝-钙铁-镁铝石榴子石系列。在62个样品中,发现了超硅石榴子石。经过计算其形成的压力范围为12.1～12.8GPa,深度可达300km。
|
| 关 键 词： | 石榴子石 超硅石榴子石 含金刚石母岩 安徽栏杆 |
| 收稿时间： | 2018/5/10 0:00:00 |
| 修稿时间： | 2018/6/15 0:00:00 |
Mineral chemistry characteristics of garnets in diamondiferous basite of Lan'gan area, Anhui Province |
| |
| CAI Yitao,ZHANG Jie,KANG Congxuan,YANG Xianzhong,CAO Zhengqi,DONG Zhongdou,MA Yuguang and SHI Jianbin.Mineral chemistry characteristics of garnets in diamondiferous basite of Lan'gan area, Anhui Province[J].Geologcal Bulletin OF China,2019,38(1):110-120. |
| |
| Authors: | CAI Yitao ZHANG Jie KANG Congxuan YANG Xianzhong CAO Zhengqi DONG Zhongdou MA Yuguang and SHI Jianbin |
| |
| Institution: | Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China,Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China,Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China,Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China,Hubei Institute of Geological Survey, Wuhan 430034, Hubei, China,The Second Institute of Hydrology and Engineering Geological Prospecting, Anhui Geological Prospecting Bureau, Wuhu 241000, Anhui, China,The Second Institute of Hydrology and Engineering Geological Prospecting, Anhui Geological Prospecting Bureau, Wuhu 241000, Anhui, China and No.5 Geological Party, Jiangsu Bureau of Geology and Mineral Resources, Xuzhou 221004, Jiangsu, China |
| |
| Abstract: | The mafic rock is exposed in northern Anhui Province, and some of them are diamondiferous rocks. In order to determine the type of garnets, the authors systematically sampled the garnets in diamondiferous basite in Lan''gan area. The MgO, SiO 2, FeO, TiO2, Al2O3, Cr2O3, CaO, MnO values of 62 single crystal garnets in this area were measured by electron microprobe spectrometer. The results show that the chemical formula of garnet group minerals is A32+B23+(SiO4)3. Group A cations are composed of Mg2+, Fe2+ and Ca2+. Group B cations are composed of Al3+, Fe3+, Mn3+ and Cr3+. The trivalent cation is mainly Al3+ while divalent cation is mainly Ca2+. It is inferred that grossularite-andradite-almandine group is the primary class in the Lan''gan area. The high calcium silicate iron garnet (majorite) was found in 62 samples. According to the composition of these majorities in Lan''gan area, the garnet of the diamondiferous basite has formation pressure of 12.1~12.8GPa, and the depth is up to 300km. |
| |
| Keywords: | garnet majorite diamondiferous rocks Lan''gan area Anhui Province |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地质通报》浏览原始摘要信息 |
| 点击此处可从《地质通报》下载免费的PDF全文 |
|
