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| PubMed | |
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Article by Lv, J. C. |
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Article by Yang, Y. C. |
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Article by Han, S. J. |
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Article by Yan, W. Q. |
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Article by Zhang, G. B. |
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Article by Zhang, B. C. |
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Article by Diao, Q. Q. |
��������Ҷ��Ӱ�����ͭ�ش�������ɽ�����Ρ����������������������Ҫ�����ڻ����������Һ���������С�Ϊ�嶨��Ҷ���ͭ�ij��ҳɿ�ʱ�����챳�������߶���Ҷ��ӻ����������ҽ�����Ԫ�ص���ѧ�� LA--ICP--MS �ʯ U--Pb ���ѧ������о�����ʯ����ѧ������ʾ�������������Ҹ���ƶþ�����ڹ����ʸƼ���ϵ�У�������ϡ��Ԫ�� ( L��EE) �� ( La/Yb)N= 10. 49 �� 19. 79��Eu ��ʾ�����쳣�����쳣���� Sr �� Y �� Yb��������������ʯԪ�� ( LILE) ����Կ���߳�ǿԪ�� ( HFSE) �����а�����һ�����ҵ�������LA--ICP--MS �ʯ U--Pb ��������ʾ���������������ʯ 206Pb/238U ��Ȩƽ������Ϊ 204. 4 ±2. 8 Ma �� 201. 2 ±1. 7 Ma���ۺ��о���Ϊ����Ҷ��Ӱ�����ͭ�ij��ҳɿ�ʱ������Ϊ��������—��٪����֮�����ÿ��γ��ڹ�������պϺ��½½��ײ��ɽ�������ǼӺ��µؿDz��������γɵ��ҽ��������õĽ����
Yanghuidongzi porphyry copper deposit of Heilongjiang��is located in the northern Jilin-Hei- longjiang fold belt and the eastern Xing-Meng orogenic belt�� The orebodies are mainly hosted in granodiorite por- phyry and tectonic breccia�� The authors studied the zircon U--Pb dating and element geochemistry of the granodior- ite porphyry of the Yanghuidongzi copper deposit��in which the geochemistry characteristics indicate that the grano- diorite porphyry is enriched in Si while depleted in Mg��pertain to peraluminous calcium-alkaline series�� The light rare earth element (L��EE) is enriched��and the ratio of (La/Yb)Nis (10. 49 ��19. 79)�� The δEu contents show weak negative or positive Eu anomalies��high Sr and low Y and Yb in content��the enrichment of large-ion litho- phile elements (LILE)��and the absence of high field strength elements (HFSE)�� Element geochemicd charac- teristics indicate that the granodiorite porphyry shows characteristics of adakitic rocks�� The LA--ICP--MS zircon U-- Pb dating indicates that the weight average 206Pb/238U ages of zircon grains from granodiorite porphyry are 204. 4 ± 2. 8 Ma and 201. 2 ±1. 7 Ma�� According to comprehensive research��the diagenesis and mineralization age of the Yanghuidongzi porphyry copper deposit is probably at the transition time of the Late Triassic and Early Jurassic�� The Yanghuidongzi porphyry copper deposit originated from granite magmatism of partial melting of the thickened lower crust occurred in continental collision orogeny regime after the closure of Paleo-Asia Ocean��