| 新疆阿尔金山喀腊大湾地区玄武岩的地球化学特征及地质意义 |
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| 关键词:Kaladawan basalt fractionation crustal contamination active continental margins |
| 基金项目:“十一五”国家科技支撑计划重点项目专题“阿尔金山东段红柳沟矿带大型铜、金、铅锌矿床找矿靶区优选与评价技术与应用研究”(编号: 2006BAB07B02-04)；中国地质调查局地质矿产调查专项“阿尔金喀腊大湾地区铁多金属矿构造控矿研究与找矿预测”(编号: 资[2012]02-061-001) |
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| Geochemical Characteristics of Basalts from Kaladawan in East Altun Mountains of Xinjiang and Their Implications |
| Kaladawan area in the eastern part of the Altun Mountains is tectonically situated between the NE-trending Altun strike-slip fault and the WE-trending northern Altun marginal fault. In this area, there appears a set of volcanic-sedimentary rocks. A geochemical study was made for the basalts. The result shows that the basalts have low Mg#, the content of REE changes greatly, the LREE is moderately enriched, but the Eu anomaly is not obvious. Co, Cr and Ni are positively correlated with MgO. In the chondrite-normalized spidergrams, some samples have Nb and Ta anomalies, whereas some other samples show Ti anomalies. In the Th/Yb-Ta/Yb diagram, the basalts belong to active continental margins. In the Th/Hf-Ta/Hf diagram, the basalts belong to continental breakup setting or early rift. Combined with geochemical characteristics of basalts of bimodal volcanic rocks in Kaladawan area and basalts in other areas of the north Altun ophiolite belt, the authors hold that the basalts from the Kaladawan area might have erupted in the active continental margins. |
| HAO Rui-xiang,CHEN Bai-lin,CHEN Zheng-le,WANG Yong,LI Song-bin,HAN Feng-bin,ZHOU Yong-gui.2013.Geochemical Characteristics of Basalts from Kaladawan in East Altun Mountains of Xinjiang and Their Implications[J].Acta Geoscientica Sinica,34(3):307-317. |
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