���繵���λ�ڶ������Ϻ�ɽ���������������ڡ�Χ��ʴ��������ҪΪ�軯��̼���λ�������ĸ��������ʯ����������ʯ����ѧ�о�������������ʯ��ҪΪһ��Ӣ���ʡ������ʻ�ɽ�ң����ڸ߹衢�ͼ�Ƽ���ϵ����ʯ (σ �� 3. 3)����b��Ba��K��Pb �ȴ�������ʯԪ�� (LILE) ��Ը����� Nb��Ta��P��Ti �ȸ߳�ǿԪ�� (HFSE) ��Կ���; ��ϡ��Ԫ�� (L��EE) �����ϡ��Ԫ�� (H��EE) ��ȸ�����Nb/Ta ֵ (ƽ��14. 7) �� Zr/Hf ֵ (26. 23 ��38. 37) ��ʾ�ҽ����п�Դ�������γ����븩����йص�½Ե�������������鸩���ϵ���С�

Dongfenggou gold deposit is located in the Dongning County within the Laoheishan Late Paleozoic rift basin�� The wall rock alterations are mainly silicification��carbonatization in type��sericitization and chloritization in type�� The research of geochemical of ore- hosting rocks shows that the ore- hosting rocks are mainly a set of the dacitic and rhyolitic volcanics�� They are characterized by high silicon��low- alkali��belonging to calcium alkaline rocks (σ ��3. 3)�� The ore- hosting rocks are relatively enriched in large ion lithophile elements (��b��Ba��K��Pb�� etc�� ) and depletion in high field strength elements (Nb�� Ta�� P�� Ti�� etc�� )�� Light rare earth elements (L��EE) are lightly enriched��which is relative to heavy rare earth elements (H��EE)�� Nb/Ta ratio (average 14. 7) and Zr/Hf ratio (26. 23 ��38. 37) have the characteristics of crust source��which is formed in the epicontinental environment related to the subduction zone and close to the subduction of Kula Plate��