个旧超大型锡多金属矿床地球化学及成因
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摘要
个旧锡多金属矿床位于云南省东南部,是一个驰名中外的超大型锡多金属矿床。本文在深入细致的野外地质工作基础上,对矿石进行了系统的显微鉴定,并对特征矿物做了电子探针定性、定量及面扫描分析,然后通过微量元素、稀土元素、同位素地球化学(Pb、S、He、Ar)对比研究,探讨了矿床的成矿物质来源、成矿流体来源,论证了个旧锡矿区经历了广泛且具有重要成矿意义的中三叠世热水沉积成矿作用和燕山晚期的花岗岩岩浆热液的叠加改造成矿作用。最后重新建立了矿床的成矿模式。论文取得的主要认识如下:
     1. 中三叠世,个旧矿区处于特殊的沉积环境—陆裂谷系中的局限边缘海盆。
     2. 中三叠世安尼期海底喷发的玄武岩,在时间、空间上与区内锡多金属矿床有着密切联系。该玄武岩源于富集成矿元素上地幔区,其地幔源区熔融前经历了交代富集作用。该富集作用对本区超大型锡多金属矿床的形成具有着重要意义。
     3. “层间氧化矿”矿体的产状以及矿石类型隐含着同生沉积的信息。
     4.矿石显微鉴定结果表明矿区曾发生热水沉积成矿作用,部分接触带矿体是燕山期花岗岩岩浆热液叠加、改造热水沉积矿体形成,在某些层间矿中,尤其是离花岗岩体较近的层间矿,存在后期岩浆热液叠加成矿作用。
     5.锡在鲕状黄铁矿、胶状结构黄铁矿中的大量存在,表明海底喷流时携带了大量成矿元素,具有成矿的潜力,同时锡石包裹体的存在暗示着海底喷流时可形成锡(SnO_2)矿体。
     6. 电气石细脉型锡矿与层间赤褐铁矿型锡矿的矿石及锡石单矿物稀土元素组成与花岗岩稀土对比研究,表明电气石细脉型矿体为花岗岩岩浆期后热液成因,而层间赤褐铁型应为热水沉积成因。层间矿块状硫化物中单矿物的稀土组成分析结果,表明部分层间矿存在热水沉积成矿作用,同时也存在花岗岩岩浆热液成矿作用,这与岩矿鉴定结果一致。层间矿围岩稀土和微量元素结果也表明部分围岩为热水沉积形成。
     7.矿石铅、硫同位素地球化学特征表明部分铅和硫源于印支期的热水沉积作用,另有部分铅、硫源于燕山期花岗岩岩浆热液作用;氦、氩同位素地球化学资料反映出该矿床早期成矿流体中氦主源于地幔,为热水沉积成因,同时
The Gejiu Sn-polymetallic deposit (Yunnan, China) is renowned at home and abroad for being one of the super large Sn-polymetallic deposits in the world. Detailed studies on the regional geology and the local geology of the deposit have been carried out in this study. Systematic microscopic observation of the ores and the quantitative and qualitative electron-probe analysis of the ores and minerals have been done. Meanwhile, the contents of trace elements, rare earth elements and the Pb, S, He, Ar isotapic compositions of the ores and rocks have been analyzed. Based on these data, the sources of the ore-forming metals and fluids have been discussed. The results showed that the Gejiu Sn-polymetallic deposit mainly experienced extensive and important Mid-Triassic submarine exhalative hydrothermal mineralization and Yanshanian magmatic hydrothermal mineralization. Finally, a genetic model was proposed.1. During Middle Triassic, the Gejiu area was in a special sedimental environment, i.e. in a restricted marginal sea basin within the continental rift system.2. The basalt, erupted in Mid-Triassic, is closely related to the Gejiu tin polymetallic mineralization both in time and space. It might be derived from the upper mantle with enriched ore-forming elements through the metasomatism which played an important role on the formation of the Gejiu super large Sn-polymetallic deposit.3. The occurrences of the "interbedded oxide orebodies" and their ore types have shown some syngenetic sedimentary information.4. The systematic and detailed microscopic observation has revealed that the Gejiu tin deposit has initially undergone submarine exhalative mineralization. Some orebodies in the contact zone were developed through the strong rework of the initial submarine exhalative orebodies by the Yanshanian granitic hydrothermal fluids. Some of the interbeded orebodies have been partly reworked by the Yanshanian granite magmatic fluids.5. The abundant Sn enriched in oolitic pyrite and colloidal pyrite show that the exhalative hydrothermal activity brought large amount of Sn and other ore-forming elements for deposition. The existence of cassiterite (SnO2) inclusions in pyrite imply that the submarine exhalative mineralization has potential to form tin deposit.6. The characteristics of the rare earth elements of ores and cassiterite separates, which were selected from tourmaline vein type ores and interbeded hematite ores, indicate that the tourmaline vein type ores were formed through the mineralization of granite magmatic fluids, whereas the interbeded hematite ores were initially formed by submarine exhalative mineralization. The rare earth elements of the sulfide separates
引文
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