西天山温泉地区早古生代斜长角闪岩的锆石SHRIMP U-Pb年龄及其地质意义

胡霭琴, 韦刚健, 张积斌, 邓文峰, 陈林丽. 西天山温泉地区早古生代斜长角闪岩的锆石SHRIMP U-Pb年龄及其地质意义[J]. 岩石学报, 2008, 24(12): 2731-2740.
引用本文: 胡霭琴, 韦刚健, 张积斌, 邓文峰, 陈林丽. 西天山温泉地区早古生代斜长角闪岩的锆石SHRIMP U-Pb年龄及其地质意义[J]. 岩石学报, 2008, 24(12): 2731-2740.
HU AiQin, WEI GangJian, ZHANG JiBin, DENG WenFeng, CHEN LinLi. SHRIMP U-Pb ages for zircons of the amphibolites and tectonic evolution significance from the Wenquan domain in the West Tianshan Mountains, Xinjiang, China[J]. Acta Petrologica Sinica, 2008, 24(12): 2731-2740.
Citation: HU AiQin, WEI GangJian, ZHANG JiBin, DENG WenFeng, CHEN LinLi. SHRIMP U-Pb ages for zircons of the amphibolites and tectonic evolution significance from the Wenquan domain in the West Tianshan Mountains, Xinjiang, China[J]. Acta Petrologica Sinica, 2008, 24(12): 2731-2740.

西天山温泉地区早古生代斜长角闪岩的锆石SHRIMP U-Pb年龄及其地质意义

  • 基金项目:

    国家重点基础研究发展规划项目“中亚造山与成矿研究”(2001CB409805)和国家自然科学基金项目(40803009)资助

SHRIMP U-Pb ages for zircons of the amphibolites and tectonic evolution significance from the Wenquan domain in the West Tianshan Mountains, Xinjiang, China

  • 西天山温泉县城以南地区出露了以温泉群为基底的前寒武纪变质岩系。其中,被当作温泉群变质岩系一部分的灰色中-粗粒斜长角闪岩,在岩石外观特征上与前寒武纪的深灰色细粒斜长角闪岩截然不同。进一步的地质研究,并应用高精度锆石SHRIMP U-Pb定年,得到东部粗粒斜长角闪岩的年龄为455.1±2.7 (2σ) Ma,西部中粒斜长角闪岩的年龄为451.4±5.4 (2σ)Ma。因而,确定了它们应该是早古生代晚奥陶世的火成岩,而不是前寒武纪地质体。在西部地段的斜长角闪岩中有一粒捕获锆石的核部得到大约900Ma的老年龄,正好与该区基底温泉群花岗质片麻岩的年龄大体一致。其微量元素和Nd-Sr同位素组成特征说明它们形成于岛弧环境。这一研究结果,为研究早古生代时期西天山与俯冲有关的地质事件,以及古亚洲洋的演化提供了新的佐证。
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出版历程
收稿日期:  2008-05-26
修回日期:  2008-10-30
刊出日期:  2008-12-31

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