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糜棱岩型金矿金元素丰度与构造变形的关系 被引量:47
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作者 陈柏林 《矿床地质》 CAS CSCD 北大核心 2000年第1期17-25,共9页
蚀变糜棱岩型金矿是一种成矿机制与控矿因素都与韧性剪切带及其糜棱岩密切相关的金矿床类型。研究表明 :1深部韧性剪切变形是元素分异迁出区 ,未叠加蚀变矿化的糜棱岩变形越强 ,Au丰度就越低 ;2中浅层次变形域是 Au元素聚集区 ,矿化发... 蚀变糜棱岩型金矿是一种成矿机制与控矿因素都与韧性剪切带及其糜棱岩密切相关的金矿床类型。研究表明 :1深部韧性剪切变形是元素分异迁出区 ,未叠加蚀变矿化的糜棱岩变形越强 ,Au丰度就越低 ;2中浅层次变形域是 Au元素聚集区 ,矿化发生于韧性剪切带糜棱岩抬升至较浅部位叠加了韧脆性变形阶段。构造变形越强的糜棱岩 ,越易叠加矿化 ,Au元素丰度越高 ;3强变形或者大构造差应力不仅是促使 Au元素活化分异、形成含 Au热液、使 Au元素进入到成矿过程 ,而且驱使含矿热液运移 ,更是为金矿成矿创造理想容矿 (赋矿 )空间的构造动力学条件 ;4蚀变糜棱岩型金矿床的特点是 :成矿较韧性变形滞后、成矿深度较韧性变形浅、矿化仅发育于较小规模的韧性剪切带中、 Au元素来源于围岩和深部、变形强度与 Au元素丰度具有特殊关系。 展开更多
关键词 构造变形 糜棱岩型 矿床 金元素丰度
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Investigating the abundance enrichment pattern of heavy elements in the only observed CEMP-r/s star J004441.04-732136.4 of the SMC
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作者 CUI WenYuan ZHANG Bo ZHAO Gang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第6期1201-1205,共5页
The post-AGB star J004441 is the first and the only one CEMP-r/s star found in SMC. Herein, we investigate the observed abun- dance pattern of the heavy elements using our parametric model. A consistent fitting result... The post-AGB star J004441 is the first and the only one CEMP-r/s star found in SMC. Herein, we investigate the observed abun- dance pattern of the heavy elements using our parametric model. A consistent fitting results was obtained for the sample star. Based on the low r = 0.08, the s-process nucleosynthesis occurred in the interior is supposed to belong to the single neutron-exposure v9 ,1/2 mbarn-1 supports a higher efficiency of the s-process nucleosynthesis relative to event. The median value of τ0 =0.44(T9/0.348)mbarn-1 supports a higher efficiency of the s-process nucleosynthesis relative to J004441 than that of the solar system, however, the value is not sufficiently high to favor the formation of a lead star. Thus, J004441 does not belong to lead star group. The large Cs value of J004441 supports the intrinsic characteristic of the s-enrichment. The Cr value is similar with that found in halo CEMP-r/s stars, which indicates that the r-process contributions is critical during heavy element enrichment. This star has a metallicity of [Fe/H] = -1.34, which is larger than that of Galaxy halo CEMP-r/s stars. The reason may be because of the different history of metallicity enrichment between the SMC and the Galaxy halo. 展开更多
关键词 stellar nucleosynthesis ABUNDANCES chemically peculiar stars
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