松潘—甘孜造山带容须卡岩浆-穹隆地质特征及构造演化

doi:10.19388/j.zgdzdc.2019.03.05

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Abstract Rongxuka magma diapir dome is located in the northeastern part of Yajiang domes in Songpan-Ganzi orogenic zone, it has undergone multi-stage tectonic evolution, and the interior structure is extremely complex. In order to clarify the evolution relationships between magma and dome in Rongxuka area, the authors studied the geological characteristics and structure evolution of the dome on the basis of field geological survey and indoor comprehensive research. The rootless or ptygmatic folds in the center of the dome were well developed, as well as ‘S-type’, ‘Z-type’ folds and ‘A-type’ recumbent folds. Superposed folds were developed in the periphery of the dome structure, which reflected that the orogenic zone was subjected to SN and EW biaxial compression in the early stage. Rongxuka dome has mainly underwent SN and EW biaxial compression in Indo-Chinese epoch or late Triassic. The time limited for the magma intruding upward to form the dome was (214.4±1.2) Ma. After the dome was formed, it went through the stages of extrusion nappe and stress relaxation. Owing to the rapid tectonic uplift of the southeastern margin of Tibetan Plateau during the early Miocene(17~10 Ma), the NW-SE sinistral strike slip faults of Xianshuihe were formed, which contributed to a series of NNW ductile and brittle fractured shear zones in Rongxuka area.

Key words： Rongxuka dome Songpan-Ganzi orogenic zone magma diapir tectonic evolution

Received: 23 November 2018

ZTFLH:	P542
	P588.131

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	Articles by authors
	YE Yakang
	ZENG Min
	ZHOU Xiong
	WU Wenhui
	XU Yunfeng
	LI Zheng

Cite this article:

YE Yakang,ZENG Min,ZHOU Xiong, et al. Geological characteristics and structure evolution of Rongxuka magmatic-dome in Songpan-Ganzi orogenic zone[J]. , 2019, 6(3): 37-46.

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http://www.zgdzdcbjb.com/EN/10.19388/j.zgdzdc.2019.03.05 OR http://www.zgdzdcbjb.com/EN/Y2019/V6/I3/37

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