天津蓟县东水厂锰方硼石矿床成因新认识
发布时间：2019-03-23 20:32
【摘要】：天津蓟县东水厂锰方硼石矿床是世界上唯一一个具有经济开发价值的锰方硼石矿床,锰方硼石赋存与中元古代高于庄组二段泥晶白云岩中。本文通过微量元素分析探讨了锰方硼石的成矿环境,测定结果显示Sr/Ba=0.125~0.128;V/(Ni+V)=0.230~0.320;Th/U=4.356~4.898;V/Cr=0.018~0.026,各微量元素对比值范围变化不大;LREE总量为66.12×10~(-6)~67.90×10~(-6),HREE总量(包含Y)为18.88×10~(-6)~19.56×10~(-6),LREE/HREE值为3.38~3.60,Y/Ho值介于28.25~29.14之间,δCe介于0.829~0.854之间,显示为弱的负Ce异常,δEu值介于0.831~0.846之间,显示为弱的负Eu异常。地球化学数据指示其成矿环境属海相沉积环境,海水环境为相对氧化的状态,成矿过程中有陆源物质的加入。Sm/Nd-Eu/Sm图解表明研究区与柴达木盆地第三系蒸发岩较为相似,反应锰方硼石成矿时具有类似的蒸发成因。通过对硼同位素(δ~(11)B的数值范围为1.4‰~10.7‰)的解译进一步探讨了锰方硼石在原生成矿阶段的具体成因(海相蒸发沉积)。结合前人所做的锰方硼石地球化学数据,对东水厂锰方硼石矿床的成因做出了新的解释,即锰方硼石成矿时应属海相蒸发成因,而热液活动的过程则可能是发生于锰方硼石成矿之后,属后期热液改造作用,从而形成了锰方硼石复杂的地球化学特征。
[Abstract]:The Dongshuichang Manganese square borite deposit in Jixian County, Tianjin, is the only manganese square borite deposit with economic development value in the world. The manganese square borite occurs in the middle Proterozoic mudstone dolomite of the second member of the Gaogaozhuang formation. In this paper, the metallogenetic environment of manganese borite has been studied by trace element analysis. The results show that Sr/Ba=0.125~0.128;V/ (Ni V) = 0.230? 0.320? Thu? U? 4.356? 4.898. the ore-forming environment of manganite has been studied. There was no significant change in the ratio range of each trace element in the range of 0.018 and 0.026 V _ (2) Cr ~ (2 +). The total amount of LREE is 66.12 脳 10 ~ (- 6) ~ 67.90 脳 10 ~ (- 6), HREE (including Y) is 18.88 脳 10 ~ (- 6) ~ 19.56 脳 10 ~ (- 6), the LREE/ HREE value is 3.38 脳 10 ~ (- 6), the Y / Ho value is between 28.25 脳 10 ~ (- 14) and 28.25 脳 10 ~ (- 6). 未 Ce is between 0.829 and 0.854, showing weak negative Ce anomaly and 未 EU value between 0.831 and 0.846, showing weak negative Eu anomaly. Geochemical data indicate that the metallogenic environment is marine sedimentary environment and the seawater environment is relatively oxidized. The Sm / Nd-Eu/Sm diagram shows that the study area is more similar to the Tertiary evaporates in Qaidam Basin, and the reaction manganese borite mineralization has a similar evaporation origin. Based on the interpretation of the boron isotope (未 ~ (11) B in the range of 1.4 鈥，
本文编号：2446205
[Abstract]:The Dongshuichang Manganese square borite deposit in Jixian County, Tianjin, is the only manganese square borite deposit with economic development value in the world. The manganese square borite occurs in the middle Proterozoic mudstone dolomite of the second member of the Gaogaozhuang formation. In this paper, the metallogenetic environment of manganese borite has been studied by trace element analysis. The results show that Sr/Ba=0.125~0.128;V/ (Ni V) = 0.230? 0.320? Thu? U? 4.356? 4.898. the ore-forming environment of manganite has been studied. There was no significant change in the ratio range of each trace element in the range of 0.018 and 0.026 V _ (2) Cr ~ (2 +). The total amount of LREE is 66.12 脳 10 ~ (- 6) ~ 67.90 脳 10 ~ (- 6), HREE (including Y) is 18.88 脳 10 ~ (- 6) ~ 19.56 脳 10 ~ (- 6), the LREE/ HREE value is 3.38 脳 10 ~ (- 6), the Y / Ho value is between 28.25 脳 10 ~ (- 14) and 28.25 脳 10 ~ (- 6). 未 Ce is between 0.829 and 0.854, showing weak negative Ce anomaly and 未 EU value between 0.831 and 0.846, showing weak negative Eu anomaly. Geochemical data indicate that the metallogenic environment is marine sedimentary environment and the seawater environment is relatively oxidized. The Sm / Nd-Eu/Sm diagram shows that the study area is more similar to the Tertiary evaporates in Qaidam Basin, and the reaction manganese borite mineralization has a similar evaporation origin. Based on the interpretation of the boron isotope (未 ~ (11) B in the range of 1.4 鈥，
本文编号：2446205
本文链接：https://www.wllwen.com/kejilunwen/kuangye/2446205.html
