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| PubMed | |
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Article by Tang, C. 1 |
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Article by Chai, P. 2 |
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Article by Sun, J. G. 2 |
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Article by Wang, Q. H. 3 |
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Article by Chen, X. S. 1 |
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Article by Li, Y. X. 2 |
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Article by Yang, F. 2 |
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Article by Liu, Y. S. 4 |
�����������ӽ����ɿ�������صĻԳ���ϵͳ���ѧ���о�������ʯ��CL ͼ��� Th /U ��ֵ�����������Գ������ʯU--Pb �������ɻ���Ϊ4 �飬������ֵ�ֱ�Ϊ: 811 �� 812 Ma�� 480 �� 502 Ma��259 Ma ��210 �� 175 Ma������210 �� 182 Ma ( ��ֵ203. 4 ± 2. 5 Ma) ����Գ��ҵ��γ�ʱ�����ҽ���Դ������λ�ᾧ���̴��¾���28 Ma; ����3 ��Ϊ�������м�ʯ����ʾ������Ԫ�Ŵ����к����������������������ǿ�ҵĵؿ���������; ���ҽ��ݻ��������һ����ýǶȷ������ɿ����÷����������λ���̻���٪��������( ��ֵ189 ± 3 Ma) ����չ�Ρ�
The systematic chronological research of the gabbro associated with the mineralization of Da'anhe gold deposit in Yichun of Heilongjiang��and the CL images of zircon and Th /U ratio characteristics showed that: the zircon U--Pb dating of gabbro can be divided into 4 groups: 811 �� 812 Ma��480 �� 502 Ma��259 Ma and 210 �� 175 Ma��respectively�� The 210 �� 182 Ma ( mean 203. 4 ± 2. 5 Ma) represents the forming time of gabbro and the magma experienced 28 Ma from the source to crystallization�� The other three groups belong to captured detrital zircons�� which revealed this region experienced crustal growth during Late Proterozoic��Middle Cambrian and Late Permian��Mineralization occurred in the process of rock emplacement or the extension period in the middle Early Jurassic ( mean 189 ± 3 Ma) from the perspective of magma evolution and of skarnization��
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