��С���������ҽ������ʯ LA��ICP��MS U��Pb ���ѧ����ʯ����ѧ�о��������������ʯ����Ϊ 211 ��214 Ma����Ȩ��ƽ����ֵΪ (212. 8 ± 1) Ma�������ҽ������������������� TiO₂ ��Zr/ P₂O₅ ��P₂O₅��Zr �� SiO₂ ��K ₂O ͼ�⣬�ж���ʯΪ�߼ظƼ���ϵ�У�A/CNK ֵΪ 1. 25 �� 1. 57��Ϊ�����ʡ�������������ʯԪ�� (�� K����b��Ba)����Կ���߳�ǿԪ�� (�� Nb��Ta��P��Ti)���� Mg # ֵ (51. 74 ��52. 56��ƽ��Ϊ 52. 17)��Nb/Ta ��ֵ (13. 52 �� 16. 00)����b/Sr ��ֵ (0.13 �� 0.18)��Th/Nb ��ֵ (0. 34 ��0. 37) �� Ba/La ��ֵ (12. 39 ��15. 83)����ʾ����������п�᣻���ص㡣�ۺ�ǰ���о��ɹ�����Ϊ��ʯ�γ��ڹ�������պ�֮�����ɽ���Ż�����

LA-ICP-MS zircon U-Pb dating and geochemical data of Xiaohu diorite porphyrite were studied�� The results indicate that the diorite porphyrite pluton formed in Late Triassic (212. 8 ±1) Ma. Based on TiO ₂ ��Zr/P₂O₅ ��P₂O₅��Zr��and K₂O �� SiO₂ diagrams of rocks��the diorite porphyrite is characterized by high- K calc- al- kaline and peraluminous affinities��with an A/CNK ratio ranging from 1. 25 to 1. 57��enrichment in LILE (such as K����b��Ba)��relatively depleting in HFSE (such as Nb��Ta��P��Ti)�� Combined with their high Mg # values (51. 74 ��52. 56)��Nb/Ta = 13. 52 �� 16. 00����b/Sr = 0. 13 �� 0. 18��Th/Nb = 0. 34 �� 0. 37��Ba/La = 12. 39 �� 15. 83��it can be concluded that the magmatic mixing evolution trend�� Integrated the regional tectonic evolution��it is suggested the porphyrite formed in the post- orogenic extension setting��which was related to the closure of the Pa- leo- - Asian Ocean��