| 于 锴,武 磊,王二腾,郭志昂,王 赟,王金荣.阿拉善地块南缘古生代花岗岩类研究进展[J].甘肃地质,2021,(2):23-29 |
| 阿拉善地块南缘古生代花岗岩类研究进展 |
| Research Progress of Paleozoic Granitoids in the Southern Margin ｏf Alxa Block，NW China |
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| DOI： |
| 中文关键词: 阿拉善南缘 古生代 花岗岩类 岩浆成因 构造演化 |
| 英文关键词:southern margin of Alxa Paleozoic granitoids magmatic origin tectonic evolution |
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| 中文摘要: |
| 阿拉善地块处于华北克拉通，塔里木克拉通和祁连造山带的交汇处，其南缘古生代花岗岩广泛分布。结合近年来阿拉善南缘古生代花岗岩研究成果，从锆石U-Pb年代学和地球化学等方面进行分析总结，认为阿拉善南缘早古生代花岗岩主要受控于祁连造山带的构造演化，其岩浆活动可分为两期，中奥陶世—早志留世和中志留世—早泥盆世，前者处于俯冲环境，后者为后碰撞伸展环境；晚古生代花岗岩仅零星出露于龙首山地区，岩石地球化学特征与宗乃山—沙拉扎山构造带花岗岩相似，与中亚造山带的构造演化相关。并对目前研究中存在的问题和未来研究的方向提出了建议。 |
| 英文摘要: |
| Alxa block is located at the intersection of the North China craton, Tarim craton and Qilian orogenic belts, and the Paleozoic granites are widely distributed in the southern margin of the Alxa. Based on zircon U-Pb geochronology and geochemistry, we conclude that the Early Paleozoic granitoids in the southern margin of Alxa are mainly controlled by the tectonic evolution of the Qilian orogenic belt. The magmatic activity can be divided into the Early Ordovician to the Early Silurian and the Middle Silurian to the Early Devonian. The former is a subduction environment and the latter is a post-collision extensional environment. The Late Paleozoic granites are only sporadically exposed in the Longshoushan area, and the petrogeochemistry characteristics are similar to the granites in the Zongnaishan-shalazhashan tectonic belt, which is related to the tectonic evolution of the Central Asian orogenic belt. And we also make suggestions for the future direction of research of granitoids at the southern margin of Alxa. |
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