Hydrogen and Oxygen Isotopic Characteristics of the Fluid Inclusions from the Liangkeshu Iron Deposit in Altay Region, Xinjiang
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摘要: 新疆两棵树铁矿位于阿尔泰南缘克朗盆地，矿床赋存于中-上泥盆统阿勒泰镇组片岩与二长花岗岩接触带的伟晶岩中。本文对矿石中石英流体包裹体进行显微测温分析，结果显示包裹体类型以液体包裹体为主，流体的均一温度变化于156～367℃，主要集中于210～250℃，成矿流体盐度w(NaCleq)为0.18%～18.72，密度为0.80～0.95 g/cm3，表明成矿流体属中温度、低盐度、中低密度的H2O-NaCl体系。石英的δDSMOW为-110‰～-76‰，δ18OSMOW为5.3‰～7.9‰，δ18OH2O为1.03‰～1.07‰，表明成矿流体来源于岩浆水，混合大气降水； 成矿时代为中泥盆世(约377 Ma)，成矿作用与二长花岗岩的侵入有关； 温度和压力的降低、流体混合、水岩反应等在铁成矿过程中起着主导作用。Abstract: The Liangkeshu iron deposit in Xinjiang is located in the Kelang basin at the southern margin of Altay. The iron deposit occurs in pegmatite dikes at the contact zone of monzonitic granite and schist of the Middle-Upper Devonian Aletai Formation. Fluid inclusions in quartz from the ore body, which are mainly liquid inclusions were studied by micro temperature measurement and are described in this paper. The results indicate that the homogenization temperatures of the fluid inclusions varied from 156℃ to 367℃, mostly distributed from 210℃ to 250℃. The salinity (NaCleq) of fluids ranged from 0.18% to 18.72% and the densities ranged from 0.80 g/cm3 to 0.95 g/cm3. Ore fluids in the Liangkeshu iron deposit were characterized by medium temperature, low salinity and low density, and belonged to the H2O-NaCl system. δDSMOW values of quartz were from -110‰ to -76‰, δ18OSMOW values changed from 5.3‰ to 7.9‰ and δ18OH2O values varied from 1.03‰ to 1.07‰, implying that the ore-forming fluid was magmatic water mixed with meteoric water. Fe mineralization in the Liangkeshu deposit occurred in the Middle Devonian period (about 377 Ma), and is closely related to the monzonitic granite. The decrease of temperature and pressure, the fluids mixing and water-rock reaction played important roles in ore-forming processes of the Fe ore bodies.
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表 1 两棵树铁矿石英中流体包裹体特征及测温结果
Table 1. Characteristics and microthermometric data of fluid inclusion of the Liangkeshu iron deposit
样品编号 岩石名称 包裹体类型 寄主矿物 数量/个 均一温度
θ/℃冰点温度
θ/℃盐度/% JG-01 含绿帘石磁铁矿石英脉 液体包裹体 石英 28 206～275 -8.5～-2.6 4.34～12.64 JG-02 含绿帘石磁铁矿石英脉 液体包裹体 石英 23 173～289 -12.1～-0.1 0.18～16.05 JG-11 伟晶岩 液体包裹体 石英 17 178～293 -7.3～-0.2 0.35～10.86 JG-15 含石英磁铁矿矿石 液体包裹体 石英 17 160～309 -7.9～-3.4 5.56～11.58 JG-22 含磁铁矿伟晶岩 液体包裹体 石英 30 167～271 -15.1～-0.9 1.57～18.72 JG-29 含磁铁矿矿石的伟晶岩 液体包裹体 石英 3 238～249 -8.2～-7.3 10.86～11.93 JG-30 含磁铁矿石英 液体包裹体 石英 29 192～395 -12.1～-0.8 1.91～16.05 JG-38 伟晶岩 液体包裹体 石英 12 179～275 -9.3～-2.2 3.71～13.07 
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表 2 两棵树铁矿石英中氢氧同位素组成
Table 2. Hydrogen and oxygen isotopic data of Liangkeshu pegmatite iron deposit
样品编号 δDSMOW/‰ δ18OSMOW‰ 均一温度θ/℃ δ18OH2O/‰ JG-01 -100 7.3 227 -2.81 JG-02 -103 7.8 242 -1.54 JG-11 -93 7.6 224 -2.68 JG-12 -86 7.2 244 -2.03 JG-15 -76 7.3 247 -1.79 JG-18 -101 7.2 234 -2.54 JG-22 -100 7.6 236 -2.04 JG-29 -89 7.4 272 -0.57 JG-30 -105 7.9 280 1.04 JG-38 -110 5.3 346 -0.12
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[1] 栾世伟,毛玉元,范良明,巫晓兵,林金辉.可可托海地区稀有金属成矿与找矿[M].成都:成都科技大学出版社, 1995: 272.
[2] 邹天人.增生大陆边缘(阿尔泰式)稀有金属伟晶岩矿床模型[M]//裴荣富,主编.中国矿床模式.北京:地质出版社, 1995: 1-357.
[3] 王登红,陈毓川,徐志刚,李天德,傅旭杰.阿尔泰成矿省的成矿系列及成矿规律[M].北京:原子能出版社, 2002: 493.
[4] Zhu Y F, Zeng Y S, Gu L B. Geochemistry of the rare metal-bearing pegmatite No.3 vein and related granites in the Keketuohai region, Altay mountains, northwest China[J]. Journal of Asian Earth Sciences, 2006, 27: 61-77. doi: 10.1016/j.jseaes.2005.01.007
[5] 邹天人,李庆昌.中国新疆稀有及稀土金属矿床[M].北京:地质出版社, 2006: 51-160.
[6] Wang T, Tong Y, Jahn B M, Zou T R, Wang Y B, Hong D W, Han B F. SHRIMP U-Pb Zircon geochronology of the Altai No. 3 Pegmatite, NW China, and its implications for the origin and tectonic setting of the pegmatite[J]. Ore Geology Reviews,2007,32: 325-336. doi: 10.1016/j.oregeorev.2006.10.001
[7] 张志欣,杨富全,罗五仓,刘锋,柴凤梅,吕书君,欧阳刘进,姜丽萍.新疆阿尔泰乌吐布拉克铁矿床矽卡岩矿物特征及其地质意义[J].岩石矿物学杂志,2011,30(2): 267-280. http://www.cnki.com.cn/Article/CJFDTOTAL-YSKW201102013.htm
[8] 杨富全,刘锋,柴凤梅,张志欣,耿新霞,吕书君,姜丽萍,欧阳刘进.新疆阿尔泰铁矿地质特征、时空分布及成矿作用[J].矿床地质,2011, 30(4): 575-598. http://www.cnki.com.cn/Article/CJFDTOTAL-KCDZ201104002.htm
[9] 杨富全,郭旭吉,黄承科,刘锋,柴凤梅,耿新霞,张保江.新疆阿尔泰托莫尔特铁(锰)矿成矿作用[J].岩矿测试,2012,31(5): 906-914. http://www.cnki.com.cn/Article/CJFDTOTAL-YKCS201205028.htm
[10] 何国琦,成守德,徐新,李锦轶,郝杰.中国新疆及邻区大地构造图(1:2500000)说明书[M].北京:地质出版社, 2004: 1-65.
[11] 柴凤梅,董连慧,杨富全,刘锋,耿新霞,黄承科.阿尔泰南缘克朗盆地铁木尔特花岗岩体年龄、地球化学特征及成因[J].岩石学报,2010,25(2): 377-386. http://www.cnki.com.cn/Article/CJFDTOTAL-YSXB201002004.htm
[12] 郭彦良,苏凯林．新疆福海县两棵树铁矿普查地质报告[R].2006.
[13] 姜丽萍,柴凤梅,杨富全,刘锋,张志欣,耿新霞,吕书君.新疆阿尔泰两棵树铁矿区二长花岗岩LA-ICP-MS锆石定年及地质意义[J].现代地质,2011,25(4): 712-719. http://www.cnki.com.cn/Article/CJFDTOTAL-XDDZ201104013.htm
[14] 姜丽萍.阿尔泰两棵树伟晶岩型铁矿床流体包裹体特征研究[D].乌鲁木齐:新疆大学,2011.
[15] 杨富全,毛景文,柴凤梅,刘锋,周刚,耿新霞,刘国仁,徐林刚.新疆阿尔泰蒙库铁矿床成矿流体及成矿作用[J].矿床地质, 2008, 27(6): 659-680. http://www.cnki.com.cn/Article/CJFDTOTAL-KCDZ200806002.htm
[16] 吕书君,张志欣,杨富全,柴凤梅,张希兵,刘锋,姜丽萍,耿新霞.准噶尔北缘老山口铁铜金矿床成矿流体及成矿机制[J].矿床地质,2012,31(3): 517-534. http://www.cnki.com.cn/Article/CJFDTOTAL-KCDZ201203011.htm
[17] Bodnar R J. A method of calculateing fluid inclusion volumes based on vapor bubble diameters and PVTX properties of inclusion fluids[J]. Economic Geology, 1983, 78: 535-542. doi: 10.2113/gsecongeo.78.3.535
[18] Coleman M L, Sheppard T J, Durham J J, Rouse J E,Moore G R. Reduction of water with zinc for hydrogen isotope analysis[J]. Analytical Chemistry, 1982, 54: 993-995. doi: 10.1021/ac00243a035
[19] Clayton R N, Mayeda T K. The use of bromine pentaflu-oride in the extraction of oxygen from oxides and silicates for isotopic analysis[J]. Geochimica et Cosmochimica Acta, 1963, 27: 43-52. doi: 10.1016/0016-7037(63)90071-1
[20] 毛景文,郝英,丁悌平.胶东金矿形成期间地幔流体参与成矿过程的碳氢氧同位素证据[J].矿床地质, 2002, 21(2): 21-28. http://www.cnki.com.cn/Article/CJFDTOTAL-KCDZ200202003.htm
[21] Mao J W, Wang Y T, Ding T P, Chen Y, Wei J X, Yin J. Dashuiguo tellurium deposit in Sichuan province, China: S, C, O, and H isotope data and their implications on hydrothermal mineralization [J]. Resource Geology, 2002, 52: 15-23. doi: 10.1111/rge.2002.52.issue-1
[22] 卢焕章,范宏瑞,倪培,欧光习,沈昆,张文淮.流体包裹体[M].北京: 科学出版社, 2004: 485.
[23] Bodnar R J. Reviced equation and table for determining the freezing point depression of H2O-NaCl solutions [J]. Geochimica et Cosmochimica Acta,1993,57: 683-684. doi: 10.1016/0016-7037(93)90378-A
[24] 李兆麟,张文兰,李文,翟伟,石贵勇.云南哀牢山和新疆可可托海伟晶岩矿物中熔融包裹体电子探针研究[J].高校地质学报, 2000, 6(4): 509-522. http://www.cnki.com.cn/Article/CJFDTOTAL-GXDX200004002.htm
[25] 张金初,吴长年,刘昌实,李福春,黄小龙,周东山.新疆阿尔泰可可托海3号伟晶岩脉岩浆-热液演化和成因[J].高校地质学报, 2000, 6(1): 40-52. http://www.cnki.com.cn/Article/CJFDTOTAL-KWXB201503004.htm
[26] Clayton R N, O′Neil J R, Mayeda T K. Oxygen isotope exchange between quartz and water[J]. Journal of Geophysical Research, 1972, 77: 3057-3067. doi: 10.1029/JB077i017p03057
[27] Sheppard S M F. Characterization and isotopic variations in natural waters [J]. Reviews in Mineralogy, 1986, 16: 165-183.
[28] 牛贺才,于学元,许继峰,单强,陈繁荣,张海祥,郑作平.中国新疆阿尔泰晚古生代火山作用及成矿[M].北京:地质出版社,2006: 184.
[29] 丛峰,唐红峰,苏玉平.阿尔泰南缘泥盆纪流纹岩的地球化学和大地构造背景[J].大地构造与成矿学, 2007, 31(3): 359-364. http://www.cnki.com.cn/Article/CJFDTOTAL-DGYK200703018.htm
[30] 柴凤梅,毛景文,董连慧,杨富全,刘锋,耿新霞,张志欣,黄承科.阿尔泰南缘克朗盆地康布铁堡组变质火山岩年龄及岩石成因[J].岩石学报,2009, 25(6):1403-1415. http://www.cnki.com.cn/Article/CJFDTOTAL-YSXB200906011.htm
[31] 吴志亮.阿尔泰南缘泥盆纪火山-沉积盆地形成机制探讨[J].有色金属矿产与勘查, 1996, 5(5): 272-277. http://www.cnki.com.cn/Article/CJFDTOTAL-YSJS605.002.htm
[32] 王京彬,张进红,丁汝褔,方同辉.中国阿尔泰造山带构造-成矿系统[C]//第31届国际地质大会中国代表团学术论文集.北京:中国地质科学院,2000: 270-276.
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