Genetic Relation of Ore-Forming Fluids andCarbonatite-Syenite Complex in MaoniupingREE Deposit, Sichuan Province,China: A Review
Received date: 2004-03-25
Online published: 2004-07-10
Supported by
the Major State Basic Research Program of China (G1999043203) and National Natural Science Foundation of China (40303004)
四川省牦牛坪稀土矿床是中国第二大原生轻稀土矿床,萤石是矿区主要脉石矿物之一,碳酸岩和正长岩在空间和时间上与稀土成矿存在密切联系.在过去萤石和碳酸岩 -正长岩杂岩体地球化学研究的基础上,评述了稀土成矿流体与碳酸岩-正长岩杂岩体的成因联系.矿区碳酸岩和正长岩具有相似的REE配分模式、( 87Sr 86Sr)0,( 143 Nd 144 Nd)0,206Pb 204Pb,208Pb 204Pb同位素比值,位于地幔端元EM1和EM2之间,它们是造山环境的产物.与稀土矿化共生的萤石显示不同的稀土配分模式,但是它们具有一致的Sr、Nd、Pb同位素比值,与碳酸岩和正长岩相似.这些表明不同稀土特征的萤石来自相同的源区,稀土成矿流体与碳酸岩和正长岩岩浆存在密切联系.
许成 , 黄智龙 , 漆亮 . 四川省牦牛坪稀土矿床成矿流体与碳酸岩正长岩杂岩体成因联系评述(英文)[J]. 中国科学院大学学报, 2004 , 21(4) : 557 -561 . DOI: 10.7523/j.issn.2095-6134.2004.4.020
The Maoniuping REE deposit is the second largest primary light REE deposit in China.Fluorite is one of main gangue minerals in the orefield. Carbonat ites and syenites are spatially andtemporally associated with rare earth mineralization. Based on the previous geochemical studies of fluoriteand carbonat ite-syenite complex, we review the genetic relation of REE ore-forming fluids andcarbonatite-syenite complex. It shows that carbonatites and syenites have similar REE distributionpatterns, ( 87SrP87Sr) 0, ( 143NdP144Nd) 0, 206PbP204Pb, 208PbP204Pb ratios, and plot to the area between themantle end-member EM1 and EM2.They were formed in orogenic setting. Fluorites associated with REEmineralization display different REE distribution patterns, but their Sr, Nd, Pb isotopic ratios areuniform, and are similar to those of carbonatites and syenites. This suggests that the different REEfluorites were products of the same source, and REE ore-forming fluids were related to carbonat ite andsyenite magmas.
Key words： ore-forming fluids; carbonat ite-syenite; fluorite; Maoniuping REE deposit
[ 1 ] Xu C, Huang Z L, Liu C Q, Qi L, Li W B. Geochemistry of carbonatites in Maoniuping REE deposit, Sichuan Province, China. Science in China( D), 2003, 46: 246 ) 256.
[ 2 ] Pu G P. A discussion on metallogenet ic model and prospecting targets for the Maoniuping ore deposit of rare earth elements. Acta ofGeology inSichuan, 1993, 13: 46 ) 57 ( in Chinese with English abstract ).
[ 3 ] Xu C, Huang Z L, Liu C Q, Qi L, Li W B. Sources of ore-forming fluids in the Maoniuping REE deposit, Sichuan Province, China-evidencefrom REE, radiogenic Sr, Nd, and stable isotopes. Internati onal Geology Review, 2003, 45: 635 ) 645.
[ 4 ] Xu C, Huang Z L, Liu C Q, Qi L, Li W B. Genesis of the carbonatite-syenite complex and REE deposit at Maoniuping, Sichuan Province,China: Evidence from Pb isotope geochemist ry. Geochemical Journal, 2004, 38: 67 ) 76.
[ 5 ] Hart S R. Heterogeneous mant le domains: signatures, genesis and mixing chronologies. Earth Planetary Science Letter, 1988, 90: 273 ) 296.
[ 6 ] Bell K, Blenkinsop J. Nd and Sr isotopic composition of East African carbonatites: implicat ions for mantle het erogeneity. Geology, 1987, 15:99 ) 102.
[ 7 ] Pearce J A, Harris N B W, Tindle A G. Trace element discrimination diagrams for the tectoni c interpret ation of granit ic rocks. Journal ofPetrol ogy, 1984, 25: 956 ) 983.
[ 8 ] Xu C, Huang Z L, Liu C Q, Qi L, Li W B. PGE geochemistry of carbonat it es in Maoniuping REE deposits, Sichuan Province, China:Preliminary study. Geochemical Journal, 2003, 37: 391 ) 399.
[ 9 ] Zhang Y X, Lu Y N, Yang C X. The Panxi rift ( in Chinese). Beijing: Geological Publishing House, 1988.
[ 10] Xu C, Huang Z L, Liu C Q, Qi L, Li W B. The Pb isotopi c geochemistry of carbonatites from the Maoniuping REE deposit, China. ActaPetrol ogica Sinica, 2004 ( In press; in Chinese w ith English abstract ).
[ 11] Xu C, Huang Z L, Qi L, LiuC Q, Li W B. Sr-Nd isotope geochemistry of fluorit es: a review. Geology and Geochemistry, 2001, 29: 27 ) 34 ( inChinese w ith English abstract).
[ 12] Xu C, Huang Z L, Qi L, Liu C Q, Li W B. Sources and evolution of ore-forming fluids of the Maoniuping rare-earth deposit: evidence from REEgeochemistry of f luorites. Geol ogy and Prospecting, 2001, 37: 24 ) 28 ( in Chinese with English abstract ).
[ 13] Xu C, Huang Z L, Qi L, Liu C Q, Li W B. Fact ors affect ing the REE patt erns of fluorites in Maoniuping REE deposit, Sichuan Province. ActaMineralogical Sinica, 2001, 21: 557 ) 559 ( in Chinese with English abstract).
[ 14] Xu C, Huang Z L, Liu C Q, Qi L, Li W B. Indicator of fluorit e Sr and Nd isotopes to mantle-derived ore-forming fluids in the Maoniuping REEdeposit, Sichuan Province, China. Earth Science, 2003, 28: 41 ) 46 ( in Chinese with English abstract)
/
| 〈 |
|
〉 |
