| 赣南淘锡坑钨多金属矿床花岗岩和云英岩岩石特征及云英岩中白云母40Ar/39Ar定年 |
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| 作者姓名： | guochunli |
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| 作者单位： | 中国地质科学院矿产资源研究所 |
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| 基金项目： | 国家重点基础研究发展计划项目“白垩纪地球表层系统重大地质事件与温室气候变化”(编号2006CB701400)资助的成果 |
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| 摘 要： | 赣南崇义县淘锡坑钨矿位于南岭东西向构造带东段，属于以黑钨矿石英脉型为主的钨多金属矿床。矿床形成与燕山期中酸性岩浆作用有密切关系，石英矿脉受一组北西向断裂控制，穿切新元古界。本文在淘锡坑钨矿区3个揭露到花岗岩体顶部的中段（206、106、56中段）采集到岩体顶部云英岩样品，利用40Ar/39Ar同位素定年测得云英岩中的白云母的坪年龄分别为152.7 ± 1.5 Ma（206中段），153.4 ± 1.3 Ma（106中段），155.0 ± 1.4 Ma（56中段）。与前人用其他方法测定的花岗岩成岩和成矿年龄几乎一致。花岗岩和云英岩全岩稀土元素均具有M型四分组效应和强烈的Eu亏损特征，反映出花岗质岩浆经历了高度分异演化及其岩体结晶晚期流体/熔体相互作用。综合前人在南岭地区同类矿床的研究资料，可知南岭地区160～150Ma成岩成矿作用主要分布于南岭中-东段，可能为大陆边缘弧后岩石圈伸展的构造动力学背景的产物。
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| 关 键 词： | 岩石地球化学 40Ar/39Ar年龄 白云母 淘锡坑钨矿 赣南 |
| 收稿时间： | 2007-08-28 |
| 修稿时间： | 2007-11-02 |
Petrologic Characteristics of the Granites and Greisens and Muscovite 40Ar/39Ar Dating in the Taoxikeng Tungsten Polymetallic Deposit, Southern Jiangxi Province |
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| guochunli.Petrologic Characteristics of the Granites and Greisens and Muscovite 40Ar/39Ar Dating in the Taoxikeng Tungsten Polymetallic Deposit, Southern Jiangxi Province[J].Acta Geologica Sinica,2008,82(1):1274-1284. |
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| Authors: | WANG Chengshan FENG Zhiqiang WU Heyong WANG Pujun KONG Fanjun FENG Zihui REN Yanguang YANG Gansheng WAN Xiaoqiao HUANG Yongjian ZHANG Shihong |
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| Institution: | 1) Institute of Mineral Resources, Chinese Academy of Geological Sciences |
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| Abstract: | To obtain the global environmental and climatic records is going to be the aim of the international scientific drilling projects. As a paradigm of greenhouse climate in the geological history, the Cretaceous provides significant records of the global climate changes under the condition of greenhouse climate. But currently, the international scientific drilling programs on the Cretaceous have been focusing on marine sediments; in contrast, no terrestrial records have been recovered by any scientific program. Newly completed SK I and SK II drilling located at the northern part of the Songliao Basin are supposed to be an important breakthrough in this domain. After more than one year effort, the drilling project has been finished, and 2485.89 m of the cores have been obtained, with a high recovery ratio of 96.46%, and that is the longest and continuous Cretaceous terrestrial core all over the world. A number of important investigations and achievement on the cores from SK I and SK II have been carried out. One of the most significant contributions of this program is to get records with a resolution of ten thousand year by the centimeter-grade sampling and analysis, instead of the traditional records on million years of timescale, and hopefully, its research can provide an important reference to solve currently global warming. Combined with raw data and upcoming results for the core, an integrated accomplishment of the scientific can be made in ten profiles such as biostratigraphy, chemostratigraphy, magnetostratigraphy and geomicrobiology and so on. The preliminary progress has been achieved on sedimentology, organic geochemistry, cyclo-stratigraphy, paleolimnology, geomicrobiology and reconstruction of pCO2. All the cores will be preserved in professional storeroom after being cut for our researches, and scientists all over the world are highly welcome. The follow-up the SK II drilling program has also been selected as one of the candidate programs of ICDP (International Continental Drilling Project). |
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| Keywords: | Geochemistry 40Ar/39Ar dating Muscovite Taoxikeng tungsten deposit Gannan |
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