天山成矿带境内外地球化学特征对比——中国东天山和哈萨克斯坦楚伊犁地区

王学求; Λ.А. Ярчева; 徐善法; 迟清华; Т.А.Волкова; Ж.Кушербаев; 刘大文; 聂兰仕; 张必敏; 孙彬彬; 申伍军

天山成矿带境内外地球化学特征对比——中国东天山和哈萨克斯坦楚伊犁地区

Geochemical characteristic of Tianshan Mt in Kazakhstan and China, focused on the Eastern Tianshan Mt and Chu-Iliyskiy.

摘要

摘要: 摘要：对天山成矿带中国境内的东天山地区和哈萨克斯坦境内的楚伊犁地区1∶100万比例尺的地球化学填图所揭示的信息进行了对比研究。造岩元素、铁族元素、稀有元素、稀土元素和分散元素在这2个地区的含量和富集程度都非常接近，说明天山地区具有相同的地质背景；贵金属元素Au在楚伊犁地区的含量和富集程度要显著高于东天山地区，楚伊犁地区的Au异常不仅与石英脉型金矿有关，还与黑色页岩微粒金矿化有关；有色金属元素在2个地区差别不大，不同的是Cu异常在东天山以独立或与其他有色金属元素伴生异常存在，而在楚伊犁主要以与贵金属元素伴生异常存在；铂族元素在2个地区含量比较接近，一类异常与基性和超基性岩有关，另一类与黑色岩系有关。尽管这2个地区都还未发现有经济价值的铂族元素矿床，但在楚伊犁地区已经发现与炭质硅质岩有关的微粒金、铂矿化。

Abstract: Abstract: Geochemical mapping at scale of 1:1 million has been carried out in the Eastern Tianshan Mt in China and the Chu-Iliyskiy in Kazakhstan. The results display the following facts. Similar contents and contrasts of rock forming elements, iron group elements, REE and dispersion elements show that the geological and tectonic background is alike in the two regions. Significant difference of gold in two regions is that gold contents and contrasts in Chu-Iliyskiy are much higher than those in the Eastern Tianshan Mt. The background of nonferrous metal elements such as Cu, Pb and Zn is similar. The difference is that Cu anomalies occur as self-existent or associated with other nonferrous elements in the Eastern Tianshan Mt, but as associated with other precious metals in Chu-Iliyskiy. PGE contents and contrasts are alike, the anomalies are associated with basic/ultrabasic intrusive rocks and consistent with the distribution of black rock sequences. Micro-particle platinum and gold mineralization has been found in Chu-Iliyskiy.

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