新疆富蕴县舍勒高金矿地质地球化学特征及地质意义

舍勒高金矿是位于额尔齐斯构造带东部的小型金矿。通过野外观测,将矿床的形成分为石英黄铁矿化、石英绢云母黄铁矿及碳酸盐化3个阶段。通过岩石地球化学研究发现,赋矿岩石大离子亲石元素富集K,Rb等元素,亏损Nb,Ta,Ti等部分高场强元素;轻稀土元素( LREE)较重稀土元素(HREE)富集,Nb/Ta值为16.39~20.50,反映岩浆可能源于下地壳或上地幔的熔融,并有上地壳物质混入,为大陆岛弧至大陆边缘构造环境下的火山活动产物。矿床中金可能是深部岩浆热液沿断裂上升时,萃取围岩中的成矿物质形成的。

Geological and Geochemical Characteristics and its Geological Significance of Shelegao Gold Deposit,Fuyun County,Xinjiang

Shelegao gold deposit is located in the east of ertix tectonic belt. Metallogenic period of ore deposit is divided into three stages:Quartz pyrite stage,Quartz sericite pyrite stage and Carbonation stage.The ore-hosting rocks are relatively enriched in large ion lithophile elements (K,Rb,etc.)and depletion in high field strength elements (Nb,Ta,Ti,etc.). Light rare earth elements (LREE)are lightly enriched,which is relative to heavy rare earth elements ( HREE).Nb/Ta ratio (16.39~20.50),which suggest that the magma may originate from the melting of the lower crust or the upper mantle, and the material of the upper crust is mixed into the magma, which is the product of volcanic activity in the continental island arc to continental margin tectonic environment.The gold in the deposit may be the deep magmatic hydrothermal activity rising along the fault,extracting ore-forming materials from surrounding rock.