| 松潘—甘孜造山带容须卡岩浆-穹隆地质特征及构造演化 |
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| 作者姓名： | 叶亚康 曾敏 周雄 武文辉 徐云峰 李峥 |
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| 作者单位： | 1.成都理工大学地球科学学院,成都 610059;2.中国地质科学院矿产综合利用研究所,成都 610041;3.四川省地质调查院,成都 610081 |
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| 基金项目： | 中国地质调查局“川西稀有金属矿集区综合地质调查(编号: DD20160074)”项目资助 |
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| 摘 要： | 位于松潘—甘孜造山带雅江穹隆群北东部的容须卡岩浆底辟穹隆区,经历了多期构造演化,内部构造极其复杂。为厘清容须卡地区岩浆与穹隆的演化关系,通过野外地质调查及室内综合研究,探讨了容须卡穹隆的地质特征及构造演化。该穹隆中心发育无根或肠状褶皱,及“S”型、“Z”型褶皱和“A”型平卧褶皱; 穹隆外围发育叠加褶皱,反映造山带早期SN向和EW向收缩挤压。该穹隆主要经历了晚三叠世(印支末期)SN向与EW向的“双向挤压”作用; 成穹期岩浆向上侵位时限为(214.4±1.2) Ma; 成穹后经历了挤压推覆和应力松弛阶段; 早中新世(17~10 Ma),由于青藏高原东南缘快速抬升,松潘—甘孜造山带发育NW-SE向鲜水河左旋走滑断裂,使容须卡地区形成一系列NNW向韧脆性和脆性破碎带。
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| 关 键 词： | 容须卡穹隆 松潘— 甘孜造山带 岩浆底辟 构造演化 |
| 收稿时间： | 2018-11-23 |
Geological characteristics and structure evolution of Rongxuka magmatic-dome in Songpan-Ganzi orogenic zone |
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| Authors: | YE Yakang ZENG Min ZHOU Xiong WU Wenhui XU Yunfeng LI Zheng |
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| Institution: | 1. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China;2. Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences, Chengdu 610041, China;3. Sichuan Institute of Geological Survey, Chengdu, 610081, China |
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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. |
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| Keywords: | Rongxuka dome Songpan-Ganzi orogenic zone magma diapir tectonic evolution |
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