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华北克拉通南缘碱性基性岩金刚石成因探讨--来自红外光谱的证据
投稿时间:2020-04-22  修订日期:2020-06-25  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020241
摘要点击次数: 20
全文下载次数: 32
作者单位E-mail
蔡逸涛 中国地质调查局南京地质调查中心 cyitao@cgs.cn 
张洁 中国地质调查局南京地质调查中心  
施建斌 江苏省地质矿产局第五地质大队  
周琦忠 江苏省地质矿产局第五地质大队  
马玉广 安徽省地勘局第二水文地质工程勘察院  
刘吉强 自然资源部第二海洋研究所,自然资源部海底科学重点实验室  
徐敏成 中国地质调查局南京地质调查中心  
万方来 辽宁省第六地质大队  
徐华 辽宁省第六地质大队  
肖丙建 山东省第七地质矿产勘查院  
吴祥珂 广西壮族自治区地质调查院  
袁秋云 南京宏创地质勘查技术服务有限公司  
基金项目:江苏省自然科学基金面上项目“郯庐断裂西侧苏北地区碱性基性岩型金刚石及其包裹体对深部作用制约(BK20191132)”、“江苏省徐州市吴桥-石匣地区金刚石原生矿普查(苏地矿发[2017]96号)”资助,国家青年科学基金项目“安徽栏杆含金刚石母岩及金刚石矿床指示矿物特征研究(项目编号:41402075)”
中文摘要:我国最主要的金刚石产地均位于华北克拉通。目前在华北克拉通苏皖北部的碱性基性岩中发现大量的微粒金刚石,经确认这是一种不同于母岩为金伯利岩和钾镁煌斑岩的新类型金刚石。本文利用傅里叶可变红外光谱对这些金刚石进行测试和分析。研究结果表明,大多数金刚石中包含单原子氮(C心),少部分包含双原子氮(A心)和聚集氮(B心),其中Y心(1145~1150cm-1)与C心伴生,指示了这些金刚石大多为天然的Ib型、Ib/IaA型和IaAB型,其中以Ib型为主。N元素是金刚石中最常见的与晶格缺陷有关的杂质。该地区出土的金刚石N的含量普遍不高,通过对其中IaAB型金刚石的计算,认为该区IaAB型金刚石在地幔中赋存时间为550Ma左右,温度在1225℃左右,相当于地下150km深度。而大量Ib型金刚石的出现,说明在金刚石的初生阶段就被带出稳定区域。导致了N元素没有发生向A心的转化。
中文关键词:红外光谱  Ib型金刚石  碱性基性岩  华北克拉通  苏北  皖北
 
Discussion on the origin of basite type diamonds in the southern of North China Craton: evidences from FTIR
Author NameAffiliationE-mail
Cai Yitao Nanjing CenterChina Geological Survey cyitao@cgs.cn 
Zhang Jie Nanjing CenterChina Geological Survey  
Shi Jianbin NO. 5 Geological Team of Jiangsu Geology and Mineral Bureau  
Zhou Qizhong NO. 5 Geological Team of Jiangsu Geology and Mineral Bureau  
Ma Yuguang The Second Institute of Hydrology and Engineering Geological Prospecting of Anhui Geological Prospecting Bureau  
Liu Jiqiang Key Laboratory of Submarine Geosciences, State Oceanic Administration, Second Institute of Oceanography, Ministry of Natural Resources,  
Xu Mincheng Nanjing CenterChina Geological Survey  
Wan Fanglai The Sixth Geological Brigade of Liaoning Province  
Xu Hua The Sixth Geological Brigade of Liaoning Province  
Xiao Binjian The Seventh Institute of Geology and Mineral Resources Exploration of Shandong  
Wu Xiangke Guangxi Geological Exploration General Institute  
Yuan Qiuyun Nanjing Hongchuang geological exploration technology service Co. LTD  
Abstract:Most major diamond deposits are located in North China Craton (NCC). Now large number of micro-diamonds from alkalic basic rocks were sorted in south of NCC (at northen Jiangsu & Anhui province). This was a new type of diamond that differs from the kimberlite and lamproite types. In this research, these diamonds were tested and analyzed by FTIR. Most diamonds contain isolated nitrogen (C center), while A few contain nitrogen pairs (A centers) and nitrogen aggregates (B centers), in which Y center (1145~1150 cm-1) is associated with C center, indicated that these diamonds are mostly of natural Ib, Ib/IaA and IaAB types, of which Ib is the dominant. Nitrogen is the most common substitutional impurity in diamonds and is present in numerous combinations of nitrogen ± vacancy centres. The content of N in diamonds from this area is generally not high. Through the calculation of IaAB diamond’s FTIR data, it is believed that the mantle residence times of the IaAB diamond is about 550 Ma, and the diamond record the temperature is about 1225 ℃, derived from depth of 150 km. The large number of Ib type diamonds from this area indicates that the diamonds were rapid uplift out of the diamond stability field when they were still “young”, so most of isolated nitrogen were preserved, not aggregated to A centers.
keywords:FTIR  Ib-type Diamond  Alkalic basic rock  North China Craton  Northern Jiangsu  Northern Anhui
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