中国有色金属学报（英文版）
中國有色金屬學報（英文版）
중국유색금속학보（영문판）
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
2014年
11期
3652-3659
,共8页
铅同位素%成矿物质来源%矿床成因%大厂锡多金属矿床%广西
鉛同位素%成礦物質來源%礦床成因%大廠錫多金屬礦床%廣西
연동위소%성광물질래원%광상성인%대엄석다금속광상%엄서
lead isotope%ore source%ore genesis%Dachang tin-polymetallic deposit%Guangxi
为了揭示广西大厂锡多金属矿床的成矿物质来源，利用黄铁矿、磁黄铁矿、闪锌矿以及方铅矿等金属硫化物单矿物，开展铅同位素分析与研究。根据经典铅同位素判别模型，探讨矿质来源及其特点。结果表明，铅同位素比值206Pb/204Pb、207Pb/204Pb和208Pb/204Pb分别为17.478~18.638、15.440~15.858和37.556~39.501。根据Zartman铅构造模式，矿石铅含有上地壳成分；然而，并非所有的铅都由花岗岩提供，还存在其他的铅来源形式。显然，该矿床属于壳?幔联合作用的产物，原岩与岛弧物质具有一定的相似性；而且上地壳和下地壳中的远源可能与俯冲岛弧或洋壳有关。幔源物质在源区发挥着重要作用；同时，基于铅同位素三维拓扑投影向量，矿石铅主要集中于A区域，表明其具有扬子铅同位素省的特征，也暗示了可能与扬子板块具有一定的亲缘关系。
為瞭揭示廣西大廠錫多金屬礦床的成礦物質來源，利用黃鐵礦、磁黃鐵礦、閃鋅礦以及方鉛礦等金屬硫化物單礦物，開展鉛同位素分析與研究。根據經典鉛同位素判彆模型，探討礦質來源及其特點。結果錶明，鉛同位素比值206Pb/204Pb、207Pb/204Pb和208Pb/204Pb分彆為17.478~18.638、15.440~15.858和37.556~39.501。根據Zartman鉛構造模式，礦石鉛含有上地殼成分；然而，併非所有的鉛都由花崗巖提供，還存在其他的鉛來源形式。顯然，該礦床屬于殼?幔聯閤作用的產物，原巖與島弧物質具有一定的相似性；而且上地殼和下地殼中的遠源可能與俯遲島弧或洋殼有關。幔源物質在源區髮揮著重要作用；同時，基于鉛同位素三維拓撲投影嚮量，礦石鉛主要集中于A區域，錶明其具有颺子鉛同位素省的特徵，也暗示瞭可能與颺子闆塊具有一定的親緣關繫。
위료게시엄서대엄석다금속광상적성광물질래원，이용황철광、자황철광、섬자광이급방연광등금속류화물단광물，개전연동위소분석여연구。근거경전연동위소판별모형，탐토광질래원급기특점。결과표명，연동위소비치206Pb/204Pb、207Pb/204Pb화208Pb/204Pb분별위17.478~18.638、15.440~15.858화37.556~39.501。근거Zartman연구조모식，광석연함유상지각성분；연이，병비소유적연도유화강암제공，환존재기타적연래원형식。현연，해광상속우각?만연합작용적산물，원암여도호물질구유일정적상사성；이차상지각화하지각중적원원가능여부충도호혹양각유관。만원물질재원구발휘착중요작용；동시，기우연동위소삼유탁복투영향량，광석연주요집중우A구역，표명기구유양자연동위소성적특정，야암시료가능여양자판괴구유일정적친연관계。
For revealing the ore sources of the Dachang tin?polymetallic ore deposit, the lead isotopes were analyzed systematically by using the single minerals of sulphides, including pyrite, pyrrhotite, sphalerite, and galena. Then, the mineral sources and their characteristics were discussed based on the classical lead isotope discriminating model. The results show that the lead isotope ratios of206Pb/204Pb,207Pb/204Pb, and208Pb/204Pb range from 17.478 to 18.638, 15.440 to 15.858, and 37.556 to 39.501, respectively. According to Zartman lead model, the ore lead contains the upper crust composition; however, the granite does not provide all ore leads, and other material sources exist. Obviously, the ore deposit belongs to the result of the combined effect of crust?mantle. The source rocks are characterized by a certain degree of similarity with the island arc material. Moreover, its distant origin in the upper and lower crusts may be related to the subduction island arc material or oceanic crust. The mantle-derived material may have a certain status in the source region. Meanwhile, based on the lead isotope three-dimensional topology projection vectors, the ore leads are concentrated in zoneA, which indicates the characteristics of Yangtze lead isotope province and a possible genetic relationship with Yangtze block.
