石英菱镁岩（Listvenite）主要由菱镁矿、石英和铬云母组成，常产在变质的蛇绿混杂岩中并伴生金矿。识别出石英菱镁岩，并研究其成因及相关成矿作用，具有重要的地质意义和找矿勘探价值。我们在初步研究新疆萨尔托海石英菱镁岩和相关金矿矿床地质的基础上，提出本项目，拟开展以下工作：1）大比例尺地质填图，分析研究石英菱镁岩与蛇纹岩和剪切带的关系，是韧性剪切带将石英菱镁岩携带到地壳浅部？还是在剪切带中，超镁铁岩与流体反应，形成了石英菱镁岩透镜体？2）分别测绘穿越含金和不含金石英菱镁岩透镜体的地质剖面，对比分析不同岩石中微量元素（REE, LILE, As, Au, Cr, Cu, Ni）的含量，研究石英菱镁岩形成过程中元素和碳-氧同位素的变化特征；3）探讨石英菱镁岩的成因，分析蛇绿岩就位后，变质作用所对应地质事件的地质意义；4）研究与石英菱镁岩伴生金矿的形成过程，建立金矿成因模型。

Listvenite, with typical mineral assemblage of magnesite, quartz and fusite, is used to describe the carbonated ultramafic rocks in ophiolitic melanges. Listvenite usually accompanies gold deposits in ophiolitic melanges. Study on the transformation of ultramafic rocks to listvenite could provide important information about the geological evolution of ophiolitic melanges after their emplacement. Based on the primary studies on listvenite and related gold deposits in the Sartohay region, we propose this project with following tasks: 1) Performing large-scale geological mapping in the Sartohay region mainly aimed to the key questions such as: the relationship between serpentinite and listvenite; is ductile shear zone transported the listvenite lenses to shallow level, or the serpentinite reacted with fluid in shear zone and finally formed the listvenite lenses? 2) Make geological sections across the gold-bearing listvenite lenses and the gold-free listvenite lenses, respectively, with purposes of studying trace element (REE, LILE, As, Au, Cr, Cu, Ni) and carbon- oxygen isotope compositions across these different listvenite lenses; 3) Discuss the origin of listvenite, study the related metamorphic process after the emplacement of ophiolitic melange and its geological significance; 4) Construct the origin model of gold deposits accompanying listvenite lenses in the Sartohay region.