���˰��붫������ɽ�ֳ�һ����������������ʻ�ɽ-�������������緢�����ڵ������ҡ��������۽�������-����Ӣ���ҡ��ְ��Һ�dz�������ڵĶ������ڰ���-��������������-�������������ҹ��ɡ�����������������ڻ�ɽ�緢�γɵ������ƻ�ɽ������, ��ʯ������ṹ���������������, δ�����԰�ɫ���������(118.20 ±1.90 Ma) ���������γ�ʱ��(116.86��118.3 Ma) �������������ʯ�����������ϵ��, �߸߹衢�������Ga�͸߳�ǿԪ��(HFSE) ������, ����ʯ΢��Ԫ������ͼ��������̬����һ��, ������Sr��Ba��, ϡ���������Ҳ����, ����ϡ�������IJ��Գ�����“��Ÿ”��, δEu �еȿ�����������ʯӢ�����ҵ�⁸⁶ Sr /⁸⁷ Sr ��ʼֵ( 0.708 734 �� 0.711 488) ��¹⁴³Nd /¹⁴⁴Nd��ʼֵ(0.512 485��0.512 503) ������������ʱ���ա�Դ��һ����, Ϊ����A1�ͻ�ɽ-����������, �γ�����ʯȦ��չ�����µķ���ɽ�������Ź��컷����

Early Cretaceous granitic volcanic-intrusive complex in Xiushanlinchang of northeastern Da Hinggan Mt. consists mainly of rhyolite, rhyolite ignimbrite-trachytic dacite, trachyandesite formed ineruptive cycle stage and adamellite porphyry-geode syenogranite-graphic alkali feldspar syenogranite formed in hypabyssal invasion stage. Later intrusive body filling in the center of collap se caldera formed by volcanic eruption, and the rocks have graphic texture and geode structure without dark alkaline minerals. The age of rhyolite (118.20 ±1.90 Ma) is similar to the intrusive rocks (116.86��118.3 Ma). Most rocks of the comp lex belong to alkaline series with high silicon, alkali, aluminum, Ga and HFSEs. The spider diagrams of trace elements of these rocks are close, with Sr, Ba low valley. The rare-earth distribution patterns are similar too, and p resent slightly LREE enrichment asymmetric right wing “seagull” type and medium Eu negative anomaly. The ⁸⁶Sr /⁸⁷Sr and ¹⁴³Nd /¹⁴⁴Nd initial values of rhyolite and quartz syenite are also similar. The time-space-source consistency indicates that the comp lex is aluminum A1-type granite and formed in non-orogenic intrap late extensional tectonic setting under the extension mechanism of lithosphere.

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