南阿尔金茫崖碱长花岗岩锆石U-Pb定年及岩石成因研究
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摘要
茫崖碱长花岗岩出露于南阿尔金俯冲碰撞杂岩带内的茫崖镇柴水沟西侧,该岩石具有高的SiO_2(75.52%～77.58%),低TiO_2(0.16%～0.20%)、Al_2O_3(11.14%～11.86%)、MgO(0.15%～0.23%)、CaO(0.66%～1.45%)含量,高K/Na(1.32～1.56)值,属高钾钙碱性准铝质系列;稀土元素以轻稀土富集,重稀土平坦,高的稀土总量,明显的Eu负异常,稀土配分曲线呈"海鸥"型式特征;微量元素具有Nb、Ti、P等高场强元素亏损,同时具有Rb、Th、U和K等大离子亲石元素富集的特点,显示为典型的A型花岗岩。南阿尔金茫崖碱长花岗岩锆石LA-ICP-MS U-Pb测年结果为(408.7±1.7)Ma,结合花岗岩岩石成因类型研究和区域研究成果,认为茫崖碱长花岗岩是在南阿尔金伸展拉张背景下,由幔源岩浆底侵作用诱发下地壳部分熔融而成。南阿尔金地区沿阿尔金断裂南缘发育424～385Ma的A型花岗岩,是同一构造-岩浆事件的产物,进一步证实该阶段南阿尔金地区处于一个持续伸展的构造背景。
The Chaishuigou alkali-feldspar granite is occurred in Southern Altun subduction-collision complex,which belongs to high-K calc-alkaline and metaluminous series.These rocks have high SiO_2(75.52%～77.58%)and K_2O/Na_2O(1.32～1.56)ratios,but they have low TiO_2(0.16%～0.20%),Al_2O_3(11.14%～11.86%),MgO(0.15%～0.23%)and CaO(0.66%～1.45%)contents.These rocks are characterized by LREE enrichment and depleted HREE,with obvious Eu anomaly and"seagull"REE distribution.They are enriched in large ion lithophile elements(Rb,Th,U,K),while depleted in high field strength elements(Nb,Ti,P).Therefore,the alkali-feldspar granite in Mangnai area is the typical A-type granite.The LA-ICP-MS zircon U-Pb dating results reveal that the alkali-feldspar granite in Mangnai area was formed at ca.(408.7±1.7)Ma.Based on the testing data and some previous research results,it's suggested that alkali-feldspar granite in Mongnai area was formed by partial melting of low crust during the stage of mantle material underplating in extensional tectonic setting.A-type granites(424～385 Ma)were formed in the same tectonic-magmatic events in south Altun,indicating that a continuous extensional tectonic setting in the region.
The Chaishuigou alkali-feldspar granite is occurred in Southern Altun subduction-collision complex,which belongs to high-K calc-alkaline and metaluminous series.These rocks have high SiO_2(75.52%～77.58%)and K_2O/Na_2O(1.32～1.56)ratios,but they have low TiO_2(0.16%～0.20%),Al_2O_3(11.14%～11.86%),MgO(0.15%～0.23%)and CaO(0.66%～1.45%)contents.These rocks are characterized by LREE enrichment and depleted HREE,with obvious Eu anomaly and"seagull"REE distribution.They are enriched in large ion lithophile elements(Rb,Th,U,K),while depleted in high field strength elements(Nb,Ti,P).Therefore,the alkali-feldspar granite in Mangnai area is the typical A-type granite.The LA-ICP-MS zircon U-Pb dating results reveal that the alkali-feldspar granite in Mangnai area was formed at ca.(408.7±1.7)Ma.Based on the testing data and some previous research results,it's suggested that alkali-feldspar granite in Mongnai area was formed by partial melting of low crust during the stage of mantle material underplating in extensional tectonic setting.A-type granites(424～385 Ma)were formed in the same tectonic-magmatic events in south Altun,indicating that a continuous extensional tectonic setting in the region.
引文
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