黄陵隆起片麻岩和花岗岩的40Ar/39Ar年龄及其构造意义
40Ar/39Ar Ages of Gneiss and Granite from Huangling Uplift and Their Tectonic Significance
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黄陵花岗岩是研究扬子陆块构造演化和岩浆活动的关键对象,高精度的40Ar/39Ar定年可以为确定黄陵花岗岩的构造演化提供准确的年代学依据.采用40Ar/39Ar阶段加热技术分别测定了黄陵隆起核部变质岩中角闪石、黄陵庙花岗岩中白云母和黑云母单矿物的年龄. 角闪石40Ar/39Ar坪年龄(835.1±0.8) Ma,白云母坪年龄为(830.0±1.7) Ma,黑云母获得上凸型年龄谱,没有形成明显的年龄坪. 分析认为,角闪石年龄指示围岩受到花岗岩侵入烘烤重置的时间,白云母年龄指示黄陵花岗岩冷却至350 ℃的年龄,岩体侵入时间不晚于835 Ma,在835~830 Ma经历快速冷却事件,冷却速率为50 ℃/Ma. 黑云母低温阶段获得的年轻年龄216 Ma,记录了在晚三叠世黄陵地区缓慢差异隆升过程中发生的一期热事件.
黄陵花岗岩 / 黄陵隆起 / 40Ar/39Ar定年 / 热扰动 / 地球化学
Huangling Granite / Huangling Uplift / 40Ar/39Ar dating / thermal events / geochemistry
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国家自然科学基金项目(41972152)
湖北省自然科学基金创新群体项目(2021CFA031)
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