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遥感技术在四川汉源地区煤炭资源调查评价中的应用 被引量:2
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作者 李鸿军 《矿业工程研究》 2017年第1期55-59,共5页
卫星遥感技术在煤田地质勘查领域中的应用日趋广泛,尤其在煤田地质填图、地质构造分析及成矿规律研究方面取得了显著进展.根据目前国内外卫星遥感技术研究成果,结合四川汉源地区卫星遥感影像解译资料和野外地质调查,对研究区三叠系须家... 卫星遥感技术在煤田地质勘查领域中的应用日趋广泛,尤其在煤田地质填图、地质构造分析及成矿规律研究方面取得了显著进展.根据目前国内外卫星遥感技术研究成果,结合四川汉源地区卫星遥感影像解译资料和野外地质调查,对研究区三叠系须家河组含煤性及赋煤规律进行系统研究,最终圈定了3个含煤远景区:河西含煤远景区、清溪含煤远景区及三交-冷碛含煤远景区,为该区进一步开展煤炭资源勘查工作提供了有利靶区. 展开更多
关键词 煤炭资源 调查评价 遥感技术 汉源地区
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四川省汉源地区苏雄组火山岩地球化学特征及其对铀成矿作用的启示
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作者 阚磊 徐争启 +1 位作者 田建民 吴广彬 《矿物岩石》 CAS CSCD 北大核心 2023年第3期48-59,共12页
为了解扬子陆块西缘铀成矿与苏雄组火山岩年代学特征、构造环境之间的关系,初步建立铀富集机理,对扬子陆块西缘的铀富集与成矿提供新的理论依据,本次研究在结合前人研究的基础上,对汉源地区苏雄组火山岩的元素地球化学特征、锆石U-Pb测... 为了解扬子陆块西缘铀成矿与苏雄组火山岩年代学特征、构造环境之间的关系,初步建立铀富集机理,对扬子陆块西缘的铀富集与成矿提供新的理论依据,本次研究在结合前人研究的基础上,对汉源地区苏雄组火山岩的元素地球化学特征、锆石U-Pb测年及Lu-Hf同位素进行分析,苏雄组酸性火山岩富硅(SiO_(2)=66.27%~77.02%)、富钾(K_(2)O=2.72%~7.29%)、富铝(Al_(2)O_(3)=11.65%~18.84%),属钙碱性-碱性系列岩石;A/NK为1.43~3.12,A/CNK为1.36~3.01,属强过铝质。岩石相对富集Rb, Th, U,La, Ce,而相对亏损Ba, Nb, Ta, Ti,具有较高的稀土总量(ΣREE=196.83×10^(-6)~2 062.21×10^(-6)),相对富集轻稀土,亏损重稀土,轻重稀土分异明显((La/Yb)N比值为4.10~13.63),具有明显的Eu负异常(δEu=0.27~1.60)。样品具有相对高的10 000 Ga/Al值,锆石饱和温度908~1 003℃,指示其具有A2型花岗岩的地球化学特征。定年结果显示苏雄组酸性火山岩形成于新元古代中期为809.0±6.6 Ma, εHf(t)值为0.5~3.3,平均1.82,TDM1=1 266~1 337 Ma,平均1 303 Ma,为中元古代。苏雄组火山岩来源为中元古代的新增生中基性下地壳部分熔融并有幔源组分加入,形成于俯冲大背景下的弧后伸展环境,表明了扬子陆块西缘俯冲环境的阶段性和复杂性,洋壳的俯冲后退造成富Na软流圈的上涌为铀的富集提供了萃取剂和热点,表明了840~780 Ma弧后发展至弧前的扬子陆块西缘具有一定的铀成矿潜力。 展开更多
关键词 苏雄组火山岩 构造环境 汉源地区 铀富集与成矿 弧后伸展环境
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话说汉源
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作者 苏喜荣 《陕西史志》 2002年第2期44-45,共2页
说到汉源,一般都祖述《禹贡》:“蟠冢导漾,东流为汉,又东为沧浪之水,过三滋,至于大别,南人于江。”
关键词 汉源地区 地方志 古代史籍 蟠冢山
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Are Chinese resource-exhausted cities in remote locations? 被引量:1
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作者 孙威 毛凌潇 《Journal of Geographical Sciences》 SCIE CSCD 2018年第12期1781-1792,共12页
Numerous domestic scholars have argued that a remote location is the major factor preventing the transformation and sustainable development of resource-exhausted cities. Research to date, however, has not presented re... Numerous domestic scholars have argued that a remote location is the major factor preventing the transformation and sustainable development of resource-exhausted cities. Research to date, however, has not presented relevant evidence to support this hypothesis or explained how to identify the concept of ‘remoteness'. Resource-exhausted cities designated by the State Council of China were examined in this study alongside the provincial capital cities that contain such entities and three regional central cities that are closely connected to this phenomenon: Beijing, Shanghai, and Guangzhou. Spatial and temporal distances are used to calculate and evaluate the location remoteness degrees(LRDs) of resource-exhausted cities, in terms of both resource types and regions. The results indicate that resource-exhausted cities are indeed remote from the overall samples. Based on spatial distances, the LRDs are α_1 = 1.36(i.e., distance to provincial capital city) and β_1 = 1.14(i.e., distance to regional central city), but when based on temporal distances, α_2 = 2.02(i.e., distance to provincial capital city) and β_2 = 1.44(i.e., distance to regional central city). Clear differences are found in the LRDs between different regions and resource types, with those in western China and forest industrial cities the most obviously remote. Finally, the numbers of very remote resource-exhausted cities based on spatial and temporal distances(i.e.,α > 1.5 ∩β> 1.5) are 14 and 19, respectively, encompassing 17.9% and 24.4% of the total sampled. Similarly, 25 and 30 not remote resource-exhausted cities based on spatial and temporal distances(i.e.,α≤1.0 ∩β≤ 1.0) encompass 32.1% and 38.5% of the total, respectively. This study provided supporting information for the future development and policy making for resource-exhausted cities given different LRDs. 展开更多
关键词 resource-exhausted cities location remoteness degree method of recognition China
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