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大功率激电测量在辽宁北水泉寻找隐伏矿床的应用 被引量:3
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作者 王大平 宋丙剑 韦库明 《黄金科学技术》 2010年第3期76-78,共3页
以电法勘探理论为基础,介绍了大功率激电法在辽宁北水泉地区多金属矿的应用。大功率激电中梯扫面测量,表明视电阻率高值区位于研究区中部到南及西部,断裂、构造蚀变带多集中在电阻率或极化率变化较大的地方,主要表现为低阻;硅化蚀变带... 以电法勘探理论为基础,介绍了大功率激电法在辽宁北水泉地区多金属矿的应用。大功率激电中梯扫面测量,表明视电阻率高值区位于研究区中部到南及西部,断裂、构造蚀变带多集中在电阻率或极化率变化较大的地方,主要表现为低阻;硅化蚀变带依地质情况不同而不同,或为高阻、或为低阻。极化率异常基本以凝灰岩为中心,沿测区呈环状分布,钻孔验证结果东南部视极化率高值异常是由薄膜状黄铁矿引起,西北部视极化率高值异常由碳质物引起。对处在硅化带的低值异常处又有成矿地质条件的地段进行测深工作,指导钻孔的布署,在本区取得了良好的找矿成果。 展开更多
关键词 大功率激电 视电阻率 视极化率 隐伏矿床 北水泉 辽宁省
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冀西北水泉沟碱性岩体成因讨论 被引量:1
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作者 刘海田 范会杰 +1 位作者 孙静 王倩 《矿产勘查》 2013年第4期441-446,共6页
水泉沟碱性岩体是冀北著名的控矿碱性杂岩体,岩体由二长岩类、正长岩类及碱长正长岩类组成。各类岩石间无明显的界线,一般为渐变过渡关系。岩石化学组成总的特征是贫硅、富碱,铝含量中至高,反映了随着岩浆演化,碱质交代加强,岩体属于碱... 水泉沟碱性岩体是冀北著名的控矿碱性杂岩体,岩体由二长岩类、正长岩类及碱长正长岩类组成。各类岩石间无明显的界线,一般为渐变过渡关系。岩石化学组成总的特征是贫硅、富碱,铝含量中至高,反映了随着岩浆演化,碱质交代加强,岩体属于碱性—偏碱性岩体。通过对该岩体铅同位素、钕锶同位素图解研究,样品投点于地幔与大陆壳演化线之间,少量于陆壳演化线之上,说明铅、锶同位素不是单一来源,原始物质来源于地幔,推测岩浆自地幔上侵过程中有壳源物质加入。对比K-Ar法测年数据和^(39)Ar-^(40)Ar法年龄测试结果,认为水泉沟碱性岩体形成于288~327.4 Ma,属海西晚期。 展开更多
关键词 碱性岩 同位素 上地幔 成因 冀西北水泉
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Phytoplankton community structure in reservoirs of different trophic status, Northeast China 被引量:10
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作者 马成学 于洪贤 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2013年第3期471-481,共11页
The aim of this study was to determine the phytoplankton community structures of reservoirs of different trophic status, located in a cold region. Physical and chemical variables and the phytoplankton communities were... The aim of this study was to determine the phytoplankton community structures of reservoirs of different trophic status, located in a cold region. Physical and chemical variables and the phytoplankton communities were investigated in two reservoirs (Xiquanyan Reservoir and Taoshan Reservoir) in Northeast China in 2009. The two reservoirs showed strong seasonal fluctuations in their physical and chemical composition. Results of the trophic status index indicated that Xiaquanyan Reservoir was mesotrophic, whilst Taoshan Reservoir was eutrophic. Diatoms were the dominant phytoplankton group in Xiquanyan Reservoir throughout all seasons of the study, while in Taoshan Reservoir, diatoms dominated in spring, and cyanobacteria dominated in summer and autumn. This difference was resulted from differences in local environmental factors, including nutrients and hydrology. This study suggests that in mesotrophic reservoirs, nutrients played a key role in controlling seasonal phytoplankton successions, whereas in eutrophic reservoirs water temperature was the key factor in a cold region. Notably, the dominant species in summer in the Taoshan Reservoir was Microcystis, which may produce toxins depending on the ambient conditions, and presenting a risk of local toxin contamination. 展开更多
关键词 trophic status phytoplankton community RESERVOIR cold region
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激电测量在新疆野马山金水泉北一带金矿找矿中应用
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作者 顾文全 邓立东 +1 位作者 李利排 尹彦胜 《冶金管理》 2020年第3期132-132,134,共2页
金水泉北金矿位于野马泉金矿东侧,为野马泉西金矿控容矿的韧性剪切带的东延。工作区视极化率异常整体为北高南低,测区北部为极化率背景区,区内视电阻率异常范围65.2~1009.1Ω·m、平均值233.3Ω·m,具有南北分带、自西向东逐渐... 金水泉北金矿位于野马泉金矿东侧,为野马泉西金矿控容矿的韧性剪切带的东延。工作区视极化率异常整体为北高南低,测区北部为极化率背景区,区内视电阻率异常范围65.2~1009.1Ω·m、平均值233.3Ω·m,具有南北分带、自西向东逐渐减弱的特征,含褐铁矿硅化砂岩、黄铁矿、含碳质粉砂岩区域会出现低阻高极化特征,推测此区具有较好的找矿潜力,研究结果为以后的地质找矿具有一定的指导。 展开更多
关键词 激电测量 野马山金水泉一带 金矿 找矿 应用
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Primary dolostone related to the Cretaceous lacustrine hydrothermal sedimentation in Qingxi sag, Jiuquan Basin on the northern Tibetan Plateau 被引量:11
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作者 WEN HuaGuo ZHENG RongCai +3 位作者 QING HaiRuo FAN MingTao LI YanAn GONG BoShi 《Science China Earth Sciences》 SCIE EI CAS 2013年第12期2080-2093,共14页
Based on comprehensive studies in petrography, petrofabric analysis and geochemistry, this paper describes a unique and rare laminated micritic ferruginous primary dolostone crystallized and precipitated from the alka... Based on comprehensive studies in petrography, petrofabric analysis and geochemistry, this paper describes a unique and rare laminated micritic ferruginous primary dolostone crystallized and precipitated from the alkaline hot brine under the conditions of the Mesozoic faulted lake basin. The main rock-forming mineral of this dolostone is ferruginous dolomite with a micritic structure. This dolomite mostly exhibits laminae of 0.1-1 mm thick and is often discovered with other minerals, such as albite, analcite, barite and dickite, which have at least two types of interbedded laminae. Petrogeochemistry reveals that this dolostone contains a large number of typomorphic elements of hydrothermal sedimentation, including Sb, Ba, Sr, Mn, and V. In addition, the LREE is in relatively high concentrations and possesses the typical REE distribution pattern with negative Eu anomaly. Oxygen isotope values (C^ISOpDB) range from 5.89%~ to 14.15%o with an average of 9.69%0. The ratio of 87Sr/86Sr is between 0.711648 and 0.719546, with an average of 0.714718. These data indicate that the depositional environment is a stable, blocked, anoxic low-lying hot brine pool in the bottom of deep lake controlled by basement faults. The hydrothermal fluid is the alkaline hot brine formed by the combination of the infiltration lake water and mantle-derived magmatic water, consisting of many ions, including Ca2+, Mg2+ and Fe2+. Under the driving flow power of magmatic heat, gravity and compaction, the hy- drothermal fluid overcame the overburden pressure and hydrostatic pressure of the lake water body, and boiled to explosion, and then the explosion shattered the original laminated micritic ferruginous primary dolostone near the vent and then formed a new type of dolostone called shattered "hydroexplosion breccias". In the low-lying, unperturbed hot brine pool, far from the vent, the laminated micritic ferruginous primary dolostone was quickly crystallized and chemicals precipitated from the hy- drotherm. This study of special rocks contributes to research into the causes of the formation of lacustrine carbonate rocks and dolostone. In particular, it provides new examples and research insights for future studies of the lacustrine dolomite from the similar Mesozoic and Cenozoic basins in China. 展开更多
关键词 primary ferruginous dolostone hydrothermal sedimentation fault lakes CRETACEOUS Jiuquan Basin
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