| 李洪普.青海省柴南缘四角羊铁多金属矿区
岩浆岩特征及其成矿意义[J].地质与勘探,2011,47(6):1009-1017 |
| 青海省柴南缘四角羊铁多金属矿区
岩浆岩特征及其成矿意义 |
| Characteristics of Magmatic Rocks from the Sijiaoyang Fe-Polymetallic Ore District in theSouthern Margin of Qaidam, Qinghai Province and Their Metallogenic Significance |
| 投稿时间：2011-01-04 修订日期：2011-05-08 |
| DOI： |
| 中文关键词: 印支期花岗闪长岩 岩石地球化学特征 矽卡岩型铁多金属矿床 柴南缘四角羊矿区 |
| 英文关键词: Indosinian granodiorite, geochemical characteristics and skarn-type Fe-polymetallic deposit, Sijiaoyang ore district, Qaidam basin |
| 基金项目:中国地质调查局青藏专项项目“青海省格尔木扎日根-开心岭铁多金属矿普查冶项目资助(编号:2007-22) |
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| 中文摘要: |
| [摘 要]通过野外地质观察、岩矿石光薄片鉴定、元素化学分析、微量及稀土元素分析后认为,四角羊铁多金属矿区岩体中强不相容性的Rb、Sr、Ba、Th 元素及易于与K 容纳的Pb 元素高于原始地幔岩;稀土元素的总含量(ΣREE)在90.41×10-6～223. 89×10-6之间,ΣLREE / ΣHREE 在5.48～11.11 之间,δEu在0.66～1.02 之间;钾氩法测定的岩浆岩年龄为196～191Ma。此外,矿区矿石的一系列特点,如矿石矿物为磁黄铁矿、磁铁矿、黄铜矿、闪锌矿、方铅矿、黄铁矿及微量碲铋矿、毒砂、辉钼矿等,围岩蚀变为与矽卡岩有关的透辉石化、石榴石化等,硫同位素δ34S值在5.82%～5.83%之间,碳同位素δ13CPDB在4.32‰～34.51‰之间,氧同位素δ18OPDB在-7.82‰～-24.59‰之间等,说明该矿区印支期具钙碱性的酸性岩体与成矿关系密切。 |
| 英文摘要: |
| Abstract:This work is based on field geological observations, optical identification to thin sections of rocks and minerals, and analyses of elemental
chemistry, trace elements and rare earth elements for the Sijiaoyang iron-multi-metal distinct in the southern margin of the Qaidam basin. The result suggests that strong incompatible elements in the magmatic rocks such as Rb, Sr, Ba and Pb compatible with K element are higher than the primitive mantle
rock. The total content of rare earth elements (ΣREE) ranges from 90.41×10-6～223. 89×10-6, with ΣLREE / ΣHREE 5.48～11.11,δEu 0.66～1.02, and the K-Ar age between 196 and 191 million years. The minerals in the ore district include pyrrhotine, magnetite, chalcopyrite, sphalerite, galena and pyrite, with trace of joseite, arsenopyrite and molybdenite. Wall alteration contains garnetization. Values of34S range from 5.82% to 5.83%;δ13CPDB are between 4.32‰~34.51‰; values of18OPDB are between -7.82‰ to -24.59‰ in the ore. All of these analytical results illustrate that Indosinian acid rock bodies with cal-alkali nature have a close relationship with metallogenesis in the Sijiaoyang iron-multi-metal distict. |
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