吉林大学学报(地球科学版) ›› 2018, Vol. 48 ›› Issue (1): 334-342.doi: 10.13278/j.cnki.jjuese.20160325
• 地球探测与信息技术 • 上一篇
张志1, 管志超2, 王少军3
Zhang Zhi1, Guan Zhichao2, Wang Shaojun3
摘要: 常见造岩矿物的特征谱带位于热红外区域,因此热红外遥感在岩石地层划分与构造样式分析方面有巨大的应用潜力,并且精细岩石地层划分是构造样式分析的基础。新疆阿克苏蓝片岩被认为是目前世界范围内保存最好的前寒武纪蓝片岩之一。本文对该地质体中采集的不同类型岩石样品进行了室内热红外发射光谱测试,发现白云母石英片岩类残余辐射特征(restrahlen features,RF)位于波长8.55、9.16和9.60 μm处,绿泥绿帘片岩类RF位于波长9.60、10.50和11.66 μm处。按照ASTER TIR波段位置将样品的发射率光谱曲线重采样,利用ASTER TIR数据计算基性指数Ib和白云母指数Im。依据Ib和Im得到不同岩性段分布图,该图能反映蓝片岩地质体中不同基性程度岩石、后期侵入的基性岩墙群以及白云母石英片岩单元的空间分布。从岩性区域分布特征看,我们认为新疆阿克苏蓝片岩地质体平面构造样式表现为褶皱,其轴迹线为NE—SW向,这一结果与前人对其划分的单斜地层结构有较大的差异。另外,褶皱出现在地质体南部,说明其北部所受压力较南部小,与前人认识一致。研究结果体现了热红外遥感结合实测光谱可有效探测矿物岩石信息的优势,该方法可为相关研究提供参考。
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