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| PubMed | |
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Article by Zhang, J. J. |
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Article by Jian, Z. Z. |
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Article by Sun, T. |
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Article by Jiang, C. |
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Article by Wang, R. M. |
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Article by Yang, S. H. |
����ɽþ��--��þ��������Ҫ��ʯ�����е����ϳ��ҡ���魻Գ��ճ��ҡ��ϳ��ҡ��Գ��ճ��ҡ��Գ��ҡ����ʯ Fo Ϊ 76 ��83��Ϊ�����ʯ����ʯ��ѧ�����Լ�����Ԫ������������������������ϵ�У�ϡ��Ԫ����������������Ϊ��ϡ���Ը�������ϡ���������������Ԫ�ؾ��д�������ʯԪ�� ( ��b��Ba��Sr) ��Ը������߳�ǿԪ�� Ta��Hf��Th ��Կ�����������ҽ��ݻ������з���ᾧ������Ҫ�ܵ�б��ʯ���ơ�Nb/U��Ce/Pb ֵ���ӽ��ڵؿ�ֵ�Լ�����Ԫ�ر�ֵЭ���ϵ�����ҽ��ݻ����̷�����ͬ����Ⱦ���á�Th/Yb-Nb/Yb��La/Ba-La/Nb ֮��Ĺ�ϵָʾ�ҽ�Դ������Ϊ���彻������ĸ�������ʯȦ��ᣡ�
The major rock types of Luotuoshan mafic-ultramafic intrusions are clinopyroxene troctolite��olive gabbro norite��troctolite��gabbro-norite and gabbro�� The value of olivine Fo is 76 ��83��indicating the peridot in li- thology�� The chemical characteristics of pyroxene and major elements indicate that the intrutions belong to the tho- leiitic series�� The distribution curve of ��EE shows enrichment of L��EE and slight variation of H��EE�� Trace ele- ments are enriched in LILE (e. g. ��b��Ba and Sr) and loss of HFSE (e. g. Ta��Hf and Th)�� The fractional crys- tallization in magmatic evolution is mainly controlled by clinopyroxene�� The values of Nb/U and Ce/Pb are close to the Earth's crust and sensitive element ratio covariance relationship�� It indicates that assimilation took place during magmatic evolution�� The plots of Th/Yb versus Nb/Yb and La/Ba versus La/Nb imply that magmatic source may be the enriched lithosphere mantle modified by subduction fluid��