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| PubMed | |
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Article by Ma, G. X. |
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Article by Wang, Z. S. |
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Article by Hao, X. F. |
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Article by Song, H. R. |
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Article by Wang, X. Q. |
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Article by Lu, T. J. |
�����ɹŴ��˰����жΰ���ɽ��������������ѧ�о��������û�����������Ҫ�������Ϊ���������Һͺ���ĸ���������ҡ�Ӧ���ʯ U- - Pb LA- - ICP- - MS ���귽�����ⶨ 2 �����䣬�����������ʯ����Ϊ 311. 6 ±2. 5 Ma������ĸ�����������ʯ U- - Pb ����Ϊ 312. 0 ±1. 1 Ma������ѧ������ʾ��������Ϊ�������ʸظƼ���- -�����ʸ߷��� I �ͻ����ң����и߹衢��͵� CaO��Fe 2 O 3 �� MgO �� P 2 O 5 ����������ϡ��Ԫ�� (L��EE) ��������ϡ��Ԫ�� (H��EE) ��Կ��𣬾������Եĸ����쳣; ��Ԫ��ԭʼ��ᣱ�������ͼ�и߳�ǿԪ�� Zr��Hf �ʹ�������ʯԪ�� ��b��Th ��Ը������� Ba��Nb��Ti��Sr���� P �����ԵĿ��𡣽�ϵ���ѧ��������������о��ɹ������ڻ�����Ӧ�γ��ھֲ����ŵĹ��챳������������˰��ؿ�����۵ؿ�֮��Ĺ�������ĸ�����������Ҫ��ϵ��
The Jinjianggou granite is located in the middle part of Daxing’anling and mainly composed of sy- enogranite and biotite monzonitic granite in lithology�� The LA- -ICP- -MS U- -Pb dating results reveal that the sy- enogranite emplaced in 311.6 ±2. 5 Ma and the biotite monzonitic granite emplaced in 312. 0 ±1. 1 Ma�� The geo- chemical data indicate that the Jingjianggou granite is featured by weakly peraluminous��high content of SiO 2 and alkaline��low contents of CaO��MgO��Fe 2 O 3 and P 2 O 5 ��enrichment of L��EE with Zr��Hf����b��Th��depletion of H��EE with Ba��Nb��Ti��Sr and P��and negative Eu anomalies�� These characteristics suggest that the Jinjianggou granite is highly differential potassium calc- alkali I- type�� The Jinjianggou granites probably emplaced in regional ex- tensional background and related to the subduction of Paleo Asian Ocean between Xing’an and Songneng plates��