A unique Mo deposit associated with carbonatites in the Qinling orogenic belt, central China | |
Cheng Xu; Jindrich Kynicky; Anton R. Chakhmouradian; Liang Qi; Wenlei Song | |
2010 | |
发表期刊 | Lithos |
卷号 | 118页码:50–60 |
摘要 | The Qinling molybdenum belt is a prominent metallogenic structure in central China hosting several significant porphyry- and porphyry–skarn-type deposits. The Huanglongpu Mo deposit in the north-western part of the belt is unique in that it is associated with carbonatite dykes, rather than felsic magmatism. The carbonatites are composed largely of Sr–Mn-rich calcite and characterized by high concentrations of Sr and rare-earth elements (REE), and stable-isotope values indicative of a mantle source (δ13CPDB=−6.7± 0.2‰ and δ18OSMOW=8.2± 1.0‰). Molybdenite is associated with galena and REE minerals (parisite, bastnäsite and monazite). Both molybdenite and galena are characterized by high Re contents (up to 0.4 and 0.2 wt.%, respectively) and Re/(Mo, Pb) ratios approaching the primitive-mantle values. In contrast to the rockforming calcite, the REE minerals are enriched in light REE, whose relative proportion increases from parisite-(Ce) [average (La/Nd)n= 2.1] to bastnäsite-(Ce) and monazite-(Ce) [average (La/Nd)n= 3.1, 4.6, respectively]. The whole-rock compositions are characterized by some of the highest Mo and heavy REE abundances reported for carbonatites to date: up to 1010 ppm Mo, 1130 ppm Y+Gd…Lu and (La/Yb)n= 1.2–2.7. The unusual trace-element geochemistry of the Huanglongpu rocks may ultimately reflect the composition of their mantle source, but their enrichment in Mo+Re was undoubtedly enhanced through preferential partitioning of these elements into a light REE–Pb–S-rich fluid derived from the carbonatitic magma modified by calcite fractionation. The present work shows that Mo can be retained, transported and deposited by carbonatitic fluids capable of generating economic Mo deposits. |
关键词 | Carbonatite Molybdenite Ree Minerals Mo Deposits Mantle Source Huanglongpu |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/42920512-1/9502 |
专题 | 矿床地球化学国家重点实验室 |
作者单位 | 1.Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871, China 2.Department of Geology and Pedology, Mendel University of Agriculture and Forestry, Brno, Czech Republic 3.Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada 4.Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China |
推荐引用方式 GB/T 7714 | Cheng Xu;Jindrich Kynicky;Anton R. Chakhmouradian;Liang Qi;Wenlei Song. A unique Mo deposit associated with carbonatites in the Qinling orogenic belt, central China[J]. Lithos,2010,118:50–60. |
APA | Cheng Xu;Jindrich Kynicky;Anton R. Chakhmouradian;Liang Qi;Wenlei Song.(2010).A unique Mo deposit associated with carbonatites in the Qinling orogenic belt, central China.Lithos,118,50–60. |
MLA | Cheng Xu;Jindrich Kynicky;Anton R. Chakhmouradian;Liang Qi;Wenlei Song."A unique Mo deposit associated with carbonatites in the Qinling orogenic belt, central China".Lithos 118(2010):50–60. |
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