新疆卡鲁安矿区807号伟晶岩脉近脉围岩蚀变中成矿元素扩散模型及其影响因素
Altered country rocks of No. 807 pegmatite vein in the Kalu'an ore area, Xinjiang: Ore-forming element diffusion model and its influencing factors
查看参考文献29篇
|
文摘
|
通过对新疆卡鲁安矿区807号伟晶岩脉体蚀变围岩样品的研究,发现主元素Fe203、A1203、K_2O、 TiO_2,微量元素Li、Rb、Cs、Be等的含量在距接触带0.5 m处出现极大值,向围岩方向元素含量逐渐减少,主元素SiO_2含量则表现出相反的变化情况;同时蚀变围岩中发育白云母化和电气石化蚀变,结合矿相学及探针数据分析,认为围岩中可能发生3NaAlSi_3O_8+2H~++K~+=KAl_3Si_30_(10)(OH)_2+3Na~++6SiO_2和2KFe_3(AlSi_3O_(10))(OH)_2+ SiO_2+5Al_2SiO_5+2Na~++6H_3B0_3 = 2NaFe_3Al_6[Si_6O_(18)][BO_3]_3(0H)_4+2K~++7H_2O等反应。对蚀变围岩中组分含量变化率和距接触带的距离的关系进行拟合,结果表明蚀变围岩中组分的迁移方式以扩散为主,组分含量变化率是影响扩散距离的主要因素,有效扩散系数和扩散时间起次要作用,同时组分的扩散时间和扩散距离呈正比。从807号脉蚀变围岩Isocon图解可看出Li、Rb、Cs等元素具有较高的迁入率,与前人研究的Li、Rb、 Cs具有较高的活动性的结论相一致。 |
|
其他语种文摘
|
Based on our studies on altered country rock samples from No.807 pegmatite vein in Kalu'an ore area in Xinjiang, it is found that major element oxides such as Fe_2O_3,Al_2O_3, K_2O, TiO_2 and trace elements such as Li, Rb, Cs, Be reach their maximum contents at approximately 0.5m away from the contact zone between the pegmatite vein and the country rocks, and tend to decrease in the direction from the contact zone to the country rocks, while the content of SiO_2 shows an opposite tendency of variation. On the basis of the available mineralogical and electron probe analytical data, the occurrence of muscovite and tourmaline in the altered rocks probably indicates the following reactions, e.g., 3NaAlSi_3O_8+2H~++K~+=KAl_3Si_3O_(10)(OH)_2+3Na~++6SiO_2 and 2KFe_3(AlSi_3O_(10))(OH)_2+ SiO_2+5Al_2SiO_5+2Na~++6H_3B0_3=2NaFe_3Al_6[Si_6O_(18)][BO_3]_3(OH)_4+2K~++7H_2O. By employing the data fitting of variation rates of component contents and the corresponding distance away from the contact zone, it is suggested that the component migration patterns are controlled mainly by diffusion. Among the factors that influence the diffusion distance, the variation rate for component contents is the primary factor, while both effective diffusion coefficient and diffusion time are the secondary factors. Meanwhile, we found have that the diffusion time is proportional to the diffusion distance. The Isocon diagram for the altered country rocks of No.807 pegmatite vein shows that elements such as Li, Rb and Cs exhibit higher migration rates, which is consistent with the results of the previous study that Li, Rb and Cs exhibit much higher mobility. |
|
来源
|
地球化学
,2016,45(3):268-280 【核心库】
|
|
关键词
|
稀有金属
;
扩散模型
;
围岩蚀变
;
伟晶岩
;
阿尔泰
|
|
地址
|
中国科学院地球化学研究所, 地球内部物质高温高压重点实验室, 贵州, 贵阳, 550002
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
0379-1726 |
|
学科
|
地质学 |
|
基金
|
国家自然科学基金
;
新疆有色金属工业集团地质科研项目
|
|
文献收藏号
|
CSCD:5713516
|
参考文献 共
29
共2页
|
|
1.
邹天人.
中国新疆稀有及稀土金属矿床,2006:1-284
|
被引
53
次
|
|
|
|
|
2.
Milkereit B. Ore deposits and exploration technology.
Exploration Techniques for Rare-Element Pegmatite in the Bird River Greenstone Belt, Southeastern Manitoba. Proceedings of Exploration 07,2007:823-839
|
被引
1
次
|
|
|
|
|
3.
London D. Holmquistite as a guide to pegmatitic rare metal deposits.
Econ Geol,1986,81(3):704-712
|
被引
3
次
|
|
|
|
|
4.
Cai Keda. Carboniferous mantle-derived felsic intrusion in the Chinese Altai, NW China: Implications for geodynamic change of the accretionary orogenic belt.
Gondwana Res,2012,22(2):681-698
|
被引
13
次
|
|
|
|
|
5.
Long Xiaoping. Detrital zircon age and Hf isotopic studies for metasedimentary rocks from theChinese Altai: Implications for the Early Paleozoic tectonic evolution of the Central Asian Orogenic Belt.
Tectonics,2007,26(5):1-20
|
被引
3
次
|
|
|
|
|
6.
Long Xiaoping. Detrital zircon ages and Hf isotopes of the early Paleozoic flysch sequence in the Chinese Altai, NW China: New constrains on depositionalage, provenance and tectonic evolution.
Tectonophysics,2010,480(1/4):213-231
|
被引
29
次
|
|
|
|
|
7.
Windley B F. Neoproterozoic to Paleozoic geology of the Altay orogen, NW China: New zircon age data and tectonic Evolution.
Geology,2002,110(6):719-737
|
被引
1
次
|
|
|
|
|
8.
Chai Fengmei. Geochronology of metarhyolites from the Kangbutiebao Formation in the Kelang basin, Altay Mountains, Xinjiang: Implications for the tectonic evolution and metallogeny.
Gondwana Res,2009,16(2):189-200
|
被引
25
次
|
|
|
|
|
9.
Niu Hecai. Juxtaposition of adakite, boninite, high-TiO_2 and low-TiO_2 basalts in theDevonian southern Altay, Xinjiang, NW China.
J Asian Earth Sci,2006,28(4/6):439-456
|
被引
14
次
|
|
|
|
|
10.
Niu Hecai. Discovery of Mg-rich volcanic rock series in western Altay area, Xinjiang and its geologic significance.
Chinese Sci Bull,1999,44(18):1685-1688
|
被引
5
次
|
|
|
|
|
11.
Xu Jifeng. Geochemistry of late paleozoic mafic igneous rocks from the Kuerti area, Xinjiang, northwest China: Implications for backarc mantle evolution.
Chem Geol,2003,193(1/2):137-154
|
被引
38
次
|
|
|
|
|
12.
Cai Keda. Geochronological and geochemical study of mafic dykes from the northwest Chinese Altai: Implications for petrogenesis and tectonic evolution.
Gondwana Res,2010,18(4):638-652
|
被引
25
次
|
|
|
|
|
13.
Wong Kenny. Geochemical and geochronological studies of the Alegedayi ophiolitic complex and its implication for the evolution of the Chinese Altai.
Gondwana Res,2010,18(2/3):438-454
|
被引
2
次
|
|
|
|
|
14.
Yuan Chao. Accretionary orogenesis of the Chinese Altai: Insights from Paleozoic Granitoids.
Chem Geol,2007,242(1/2):22-39
|
被引
22
次
|
|
|
|
|
15.
Qi Liang. Determination of trace elements in granites by inductively coupled plasma mass spectrometry.
Talanta,2000,51(3):507-513
|
被引
449
次
|
|
|
|
|
16.
曲国胜. 阿尔泰造山带的铅同位素地质及其构造意义.
现代地质,1991,5(1):100-110
|
被引
18
次
|
|
|
|
|
17.
Shearer C K. Pegmatite/wallrock interactions, Black Hills, South Dakota: Progressive boron metasomatism adjacent to the Tip Top pegmatite.
Am Mineral,1986,48(12):518-539
|
被引
1
次
|
|
|
|
|
18.
Linnen R L. Granitic pegmatites as sources of strategic metals.
Elements,2012,8(4):275-280
|
被引
75
次
|
|
|
|
|
19.
Coury L. Conductance measurements Part 1: Theory.
Curr Sep,1999,18(3):91-96
|
被引
1
次
|
|
|
|
|
20.
Morgan G B V I. Alteration of amphibolitic wallrocks around the Tanco rare-element pegmatite, Bernic Lake, Manitoba.
Am Mineral,1987,72(11/12):1097-1121
|
被引
2
次
|
|
|
|
|
了解气象卫星更多信息，请访问