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.
出处
《地质找矿论丛》
CAS
CSCD
1999年第1期22-29,共8页
Contributions to Geology and Mineral Resources Research
关键词
围岩蚀变
微量元素
矿化作用
因子分布
金矿床
pingquan, wallrock alteration, minor element, mineralization,
factor analysis
