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�ʯ U--Pb ���ѧ |
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| PubMed | |
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Article by Jin, L. |
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Article by Yang, W. H. |
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Article by Yang, D. M. |
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Article by He, Z. H. |
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Article by Ma, R. |
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Article by Wang, J. G. |
�����ɹſ����������÷��ͼ�鰲ɽ���ʯ LA--ICP--MS U--Pb ���ѧ���ʯ Hf ͬλ�غ���ʯ����ѧ���Է������������÷��ͼ�鰲ɽ���γ�ʱ��ԼΪ����������� ( 123 �� 125 Ma) ���ʯ εHf( t) = ( +5. 84 �� +9. 34) ��һ�� Hf ģʽ����Ϊ 412 ��553 Ma����ʯ����ѧ������������ɽ�� K2O �����ϸߣ�SiO2������ Mg#ֵ�еȣ�������������ʯԪ�أ��߳�ǿԪ�� Nb��Ta��Ti �����Կ�����Щ������ӳ��÷��ͼ�鰲ɽ�ҵ�Դ��Ϊ���γɵĸ�����ᣡ���ϵ���ѧ�����������ع��챳�����о���÷��ͼ�鰲ɽ�ҵ��γɿ�����̫ƽ���鸩�����ú��½����չ�����йء�
The study of the LA--ICP--MS U--Pb dating��hafnium isotopic analyses of zircon��and geochemical analyses of the samples from Meiletu Formation in Keyouzhouqi of Inner Mongolia indicates that the Meiletu Forma- tion formed at about the middle Early Cretaceous (123 �� 125 Ma)�� Their Hf isotopic analyses show that the εHf(t) ranges from +5. 84 to +9. 34 and the Hf single-stage model ages vary from 412 Ma to 553 Ma�� Geochem- ical data of whole rocks show high content of K2O��moderate of SiO2and Mg#��apparently enriched in LILEs and depleted in HFSEs��especially for Nb��Ta and Ti�� These features imply that the source region of Meiletu Formation andesites is newly generated enriched-mantle�� Combined the regional tectonic settings with characteristics of geo- chemistry��it is concluded that the andesites formed in the intra-continental extentional environment related to the subduction of Pacific Plate��