河北平泉碾子沟-洛金洼金矿床蚀变围岩微量元素研究  

A STUDY ON ALTERED WALLROCKS MINOR ELEMENT AT NIANZIGOU LUOJINGWA GOLD DEPOSIT IN PINGQUAN COUNTY HEBEI PROVINCE

作　　者：别风雷[1,2] 徐九华[1,2] 

机构地区：[1]中国地质大学 [2]北京科技大学

出　　处：《地质找矿论丛》1999年第1期22-29,共8页Contributions to Geology and Mineral Resources Research

摘　　要：平泉县碾子沟－洛金洼金矿床赋存于太古界上迁西群变质岩系和石英二长斑岩、花岗闪长斑岩及闪长玢岩等岩浆侵入体中。本文研究了该矿床蚀变围岩的微量元素地球化学特征，探讨了元素的迁移富集与蚀变的关系。Nianzigou Luojingwa gold deposit located in north east Hebei Province is situated in the north China platform. It is a gold polymetallic sulfide deposit emplaced in the S N faults within the Archean metamorphic strata and magmatic intrusion massif. The wallrocks are mainly biotite plagoclase gneiss, biotite honblende plagioclase gneiss, granodiorite and diorite porphyrite, and quartz monzonite porphyry at Nian zigou area. Field geology and observation on mircrosections showed that wallrock alterations are dominated by sericitization, silicification and carbonation. The chloritization, epidotization and overlapped pyritization are also found in Luojingwa area. Elemental migration and enrichment are constrainted by alteration type and intensity. In cataclastic wallrocks within strong alteration zone Au and ore forming elements are concentrrated. Carbornation of late alteration in NV 1 makes Au rich. Overlapped pyrite quartz veins in LV 3 causes enrichment of Au and metallic elements without precipitafion of Cu and Zn. Cluster analysis and factor analysis indicate that mineralization elements are mainly brought in wallrocks by hydrothermal fluid and the hydrlthermal fluid takes some elements away from the wallrocks. In general, the more altered, the more mineralized.

关 键 词：围岩蚀变 微量元素 矿化作用 因子分布 金矿床 

分 类 号：P618.510.4[天文地球—矿床学]