The shoshonitic volcanic rocks at Hongliuxia:Pulses of the Altyn Tagh fault in Cretaceous?  

作　　者：杨经绥 孟繁聪 张建新 李海兵 

出　　处：《Science China Earth Sciences》2001年第S1期94-102,共9页中国科学（地球科学英文版）

基　　金：the "973" Project (Grant No. G1998040800) and the National Natural Science Foundation of China (Grant No. 49732070).

摘　　要：Two periods of magma activities, i.e. 106-112 Ma shoshonitic eruption and 82 Ma trachytic intrusion, are recognized at the intersection of the Altyn Tagh fault and the northern marginal fault of the Qilian terrane, northeast of the Tibetan Plateau, which were previously considered to be Quaternary magma activities. The two rock-types have significant differences in mineral assemblage and chemical composition, and formed during two different pulses of magma activity. The Cretaceous magma activities and deformation in or near the Altyn Tagh fault zone suggest a possibly tectonic reactivation after the intense activity of the fault during Indusinian.Two periods of magma activities, i.e. 106-112 Ma shoshonitic eruption and 82 Ma trachytic intrusion, are recognized at the intersection of the Altyn Tagh fault and the northern marginal fault of the Qilian terrane, northeast of the Tibetan Plateau, which were previously considered to be Quaternary magma activities. The two rock-types have significant differences in mineral assemblage and chemical composition, and formed during two different pulses of magma activity. The Cretaceous magma activities and deformation in or near the Altyn Tagh fault zone suggest a possibly tectonic reactivation after the intense activity of the fault during Indusinian.

关 键 词：: SHOSHONITE CRETACEOUS Hongliuxia Altyn Tagh FAULT TIBETAN Plateau. 

分 类 号：P534[天文地球—古生物学与地层学]