秦岭沙河湾造山带型环斑花岗岩地球化学及构造属性讨论

周滨,汪方跃,孙勇,孙卫东,丁兴,胡艳华,凌明星. 秦岭沙河湾造山带型环斑花岗岩地球化学及构造属性讨论[J]. 岩石学报, 2008, 24(6): 1261-1272.
引用本文: 周滨,汪方跃,孙勇,孙卫东,丁兴,胡艳华,凌明星. 秦岭沙河湾造山带型环斑花岗岩地球化学及构造属性讨论[J]. 岩石学报, 2008, 24(6): 1261-1272.
ZHOU Bin,WANG FangYue,SUN Yong,SUN WeiDong,DING Xing,HU YanHua,LING MingXing. Geochemistry and tectonic affinity of Shanewan orogenic rapakivi from Qinling[J]. Acta Petrologica Sinica, 2008, 24(6): 1261-1272.
Citation: ZHOU Bin,WANG FangYue,SUN Yong,SUN WeiDong,DING Xing,HU YanHua,LING MingXing. Geochemistry and tectonic affinity of Shanewan orogenic rapakivi from Qinling[J]. Acta Petrologica Sinica, 2008, 24(6): 1261-1272.

秦岭沙河湾造山带型环斑花岗岩地球化学及构造属性讨论

  • 基金项目:

    国家重点基础研究发展计划(973计划)

Geochemistry and tectonic affinity of Shanewan orogenic rapakivi from Qinling

  • 对沙河湾岩体的主量元素、微量元素地球化学进行了研究,结果显示沙河湾岩体与附近同一时期的曹坪岩体,及南秦岭花岗岩带的米坝、光头山、张家坝等岩体的地球化学特征很相近.SiO2为64.99%~69.69%,具有高的Al2O3(14.53%~16.2%),富集轻稀土和大离子亲石元素,尤其是沙河湾岩体没有明显Eu的负异常,表现出与典型的板内奥长环斑花岗岩明显不同的微量元素地球化学特点.因此,它可能是一种造山带环斑花岗岩,而不是典型的奥长环斑花岗岩.沙河湾环斑花岗岩的年龄曾被看作秦岭造山带主造山过程结束、后造山陆内演化开始的证据.本文研究结果表明沙河湾岩体与曹坪和其它南秦岭同碰撞型花岗岩形成于相同的地质背景,所以不能以其环斑结构来限制秦岭造山带主造山过程结束时代.该岩体也很可能不是沿商丹断裂带的早期碰撞的产物.
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刊出日期:  2008-06-30

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