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| PubMed | |
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Article by Li, M. F. |
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Article by Yie, S. Q. |
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Article by Yang, Y. C. |
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Article by Zhang, G. B. |
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Article by Hou, X. G. |
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Article by Meng, T. X. |
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Article by Tang, Z. |
�ڶ�����ɽ��������ϵͳ�о��Ļ����ϣ�����ɿ��йص���ʯ��չ�˽�һ����������Ԫ�ص���ѧ���Է����������ʾ��ɿ��йصĻ����Ҿ߸� Sr���� Ti �ĸظƼ��Ի�ɽ�������ҵ��������������Ҿ�ƫ���ʸƼ�����ϵ����������ʯ��Ʒ�����ֳ�������ϡ��Ԫ�غʹ�������ʯԪ�� ( LILEs) ����Կ�����ϡ��Ԫ�غ� Nb��Ta��Ti �ȸ߳�ǿԪ�� ( HFES) ����������ʾ���뵺������½��Ե�ҽ������Ƶ����ԡ����������������ʾ���ɿ�������Ҫ�����ҽ�ˮ�����е��� ( 125. 6�� ��324. 5��) ����dz�� ( 1. 0 ��7. 1 km) �ɿ���ص㡣��ɿ��й��ҽ�����ʾ�Դ�ҽ������������ǵ�������ò����������γɵġ����������ͬʱ�ڵĻ����ʱ��չ����Ϊ������ɽ��ɿ���ֱܷ�������������������鱱�����ú�������̫ƽ���鸩������������ء�
On the basis of systematical studies of Laozuoshan gold deposit��the geochemical analyses (inclu- ding major and trace elements) were further undertaken for the ore-related rocks�� The results show that the ore- related granites are low Ti and high Sr in content��belonging to High-K calcalkaline volcanic arc granites��while the diorite porphyrite appears the feature of metaluminous calc- alkaline rock series�� All the rock samples are character- ized by enrichment in light rare earth elements (L��EEs) and large ion lithophile elements (LILEs)��and relative depletion in heavy rare earth elements (H��EEs) and high field strength elements (HFSEs)��such as Nb��Ta and Ti��with affinities to the igneous rocks formed in island arc or active continental margin settings�� The features of fluid inclusions indicate that the ore- forming fluid mainly came from magmatic water��and the deposit was characterized by formation in the low- medium depth (1.0��7.1 km) under low-medium temperature (125. 6�棭324. 5��)�� Notably��the ore- related magmatic rocks show the characteristics of mantle- derived magma��suggesting that they were likely produced by partial melting of mantle experienced in metasomatism�� According to the distribution of the coeval igneous rocks in the area��it is proposed that the formation of Laozuoshan gold deposit may be closely related to the Late Paleozoic northward subduction of the Paleo- Asian oceanic plate and the Mesozoic westward subduction of the Pacific oceanic plate��respectively��