安徽省池州市马头铜钼矿区燕山期花岗闪长斑岩在距地表400 m以下，被众多细粒钾长花岗岩脉穿插，其热液蚀变-矿化从上往下可分为上部石英-绢云母化带、中部线型钾长石化带以及下部面型钾长石化带。典型的细脉-浸染状铜钼矿化主要发育于面型钾长石化带中，但钾长花岗岩中也常见铜钼硫化物的细脉和浸染。花岗闪长斑岩中石英脉流体包裹体均一温度为101.4~437.8℃，并集中于150~300℃；盐度(NaCl equiv ，质量分数)多数为0~12%。辉钼矿和黄铁矿δ34S变化范围为1.2×10-3~9×10-3，平均值为4.5×10-3。辉钼矿的δ34S略大于黄铁矿的，表示成矿流体已经达到了同位素平衡。作为一个斑岩型矿床，马头矿区花岗闪长岩体下方可能存在一个较大的钾长花岗岩体，为该铜钼矿床的形成提供了金属物源及成矿流体，而花岗闪长斑岩主要起了容矿围岩的作用。
The Yanshanian granodiorite porphyry of the copper-molybdenum ore district at Matou of Chizhou City in Anhui Province is inserted by numerous fine-grained moyite dikes at depths more than 400 m below surface. Hydrothermal alteration and mineralization of the granodiorite porphyry, the major ore-host, can be divided into three zones:the upper quartz-sericitization zone, the middle linear K-feldspar zone, and the lower K-feldsparization zone. Ores of the veinlets-disseminations-type occur typically in this zone, although veinlets and disseminations of copper and molybdenum sulfides can also be found in moyite dikes. Homogenization temperatures of fluid inclusions in quartz veins in the granodiorite porphyry range from 101.4 to 437.8 ℃, with a majority being 150-300 ℃. Most of the salinity (NaClequiv, mass fraction) determinations distributed in the range of 0-12% (mass fraction). δ34S of molybdenite and pyrite vary in the range between 1.2×10-3 and 9×10-3, with an average of 4.5×10-3. Slightly higher δ34S values of molybdenite than those of pyrite indicate isotope equilibrium in the ore-forming fluids. As the source of the moyite dikes, a bigger moyite intrusion is suggested to occur below the granodiorite body in the deposit area. The deposit is of the porphyry type with metals and fluids came essentially from the moyite, whereas the granodiorite can only be regarded as a host rock.
参考文献
| [1] | 顾连兴;徐克勤 .长江中下游断裂拗陷带的构造发展及成矿作用[J].桂林冶金地质学院学报,1987,7(04):243-251. |
| [2] | 杨子坚.华东地质[J].试论江南深断裂,1980(02):28-37. |
| [3] | 刘国生 .江南断裂带(皖南段)的变形特征及震旦纪以来的构造演化[J].合肥工业大学学报(自然科学版),1997,20(03):97-102. |
| [4] | 李文庆,曹静平.黄山岭铅锌钼多金属矿床地质特征、成因及找矿方向探讨[J].安徽地质,2006(03):190-193. |
| [5] | 赵文广,孙乘云,狄勤松,蔡晓兵.安徽省青阳县百丈岩钨钼矿床地质特征、成因及找矿方向分析[J].安徽地质,2007(02):90-94,104. |
| [6] | 宋国学,秦克章,李光明.长江中下游池州地区矽卡岩-斑岩型W-Mo矿床流体包裹体与H、O、S同位素研究[J].岩石学报,2010(09):2768-2782. |
| [7] | 蒋其胜,余传舟,黄伟平.安徽省青阳县高家塝钨矿床地质特征及控矿因素[J].安徽地质,2009(04):251-254. |
| [8] | 任云生,刘连登,张辉煌,黄景源.安徽池州地区金鸡山金矿床成矿流体特征[J].吉林大学学报（地球科学版）,2004(04):522-526. |
| [9] | 陈国光,应祥熙.安徽省贵池铺庄金矿地质特征[J].地球学报,2002(03):213-216. |
| [10] | 王伟华.安徽池州马头铜钼矿床特征及找矿思路[J].地质学刊,2011(03):311-316. |
| [11] | 李松生 .用含矿率法算石英脉型金矿储量[J].地质与勘探,1988,24(06):33-36. |
| [12] | CLARK A H .Molybdenite 2H1,molybdenite 3R,and jordisite from Carrizal alto,Atacama,Chile[J].The American Mineralogist,1971,56:1832-1835. |
| [13] | Ross R. LARGE;JOCELYN MCPHIE;J. BRUCE GEMMELL .The Spectrum of Ore Deposit Types, Volcanic Environments, Alteration Halos, and Related Exploration Vectors in Submarine Volcanic Successions: Some Examples from Australia[J].Economic geology and the bulletin of the Society of Economic Geologists,2001(5):913-938. |
| [14] | Lianxing Gu;Changzhi Wu;Zunzhong Zhang;Franco Pirajno;Pei Ni;Peirong Chen;Xinjian Xiao .Comparative study of ore-forming fluids of hydrothermal copper–gold deposits in the lower Yangtze River Valley, China[J].International Geology Review,2011(5/6):477-498. |
| [15] | OHMOTO H;RYE R O.Isotopes of sulfur and carbon[A].New York:John Wiley and Sons,Inc,1979:509-567. |
| [16] | STEIN H .Genetic traits of climax-type granites and molybdenum mineralization,Colorado mineral belt[J].Can Inst Mining Metall Spec,1988,39:394-401. |
| [17] | LOWELL J D;GUILBERT J M .Lateral and vertical alteration-mineralization zoning in porphyry ore deposits[J].Economic Geology,1970,65:373-408. |
| [18] | 芮宗瑶;黄崇轲;齐国明;徐珏 张洪涛.中国斑岩铜(钼)矿床[M].北京:地质出版社,1984:350. |
| [19] | 卢焕章.高盐度、高温和高成矿金属的岩浆成矿流体--以格拉斯伯格Cu-Au矿为例[J].岩石学报,2000(04):465-472. |
| [20] | MISRA K C.Understanding mineral deposits[M].Dordrecht:Kluwer Academic Publishers,2000:1-845. |
| [21] | 陈衍景,李诺.大陆内部浆控高温热液矿床成矿流体性质及其与岛弧区同类矿床的差异[J].岩石学报,2009(10):2477-2508. |
| [22] | 顾连兴;郑素娟 .华南型块状硫化物矿床中的胶黄铁矿及其退火作用[J].岩石矿物学杂志,1990,9(04):251-256. |
| [23] | 胡玲.显微构造地质学概论[M].北京:地质出版社,1998:158. |
| [24] | FAURE K;MATSUHISA Y;METSUGI H;MIZOTA C.Water-rich quartz and adularia veins of the Hishikari epithermal Au-Ag deposit, southern Kyushu, Japan[A].Rotterdam:A.A.Balkema Publishers,1988:537-540. |
| [25] | GU L X;ZHENG Y;TANG X Q;ZAW K DELLA-PASQUA F N WU C TIAN Z LU J NI P LI X YANG F WANG Xiang-wen .Copper,gold and silver enrichment in ore mylonites within massive sulphide orebodies at Hongtoushan,NE China[J].Ore Geology Reviews,2007,30:1-29. |
| [26] | CLEMENS J;DROOP G .Fluids,P-T paths and the fates of anatectic melts in the earth's crust[J].LITHOS,1998,44:21-36. |
| [27] | VISONA D;LAMBARDO B .Two-mica and tourmaline leucogranites from Everest-Makalu region(Nepal-Tibet). Himalayan leucogranite genesis by isobaric heating[J].LITHOS,2002,62:125-150. |
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