| 长江中下游地区蝌蚪山早白垩世玄武岩中单斜辉石的矿物学研究及其地质意义 |
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| 引用本文： | 文施华,侯通.长江中下游地区蝌蚪山早白垩世玄武岩中单斜辉石的矿物学研究及其地质意义[J].矿物岩石,2011,31(3). |
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| 作者姓名： | 文施华 侯通 |
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| 作者单位： | 中国地质大学地质过程与矿产资源国家重点实验室,北京,100083 |
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| 基金项目： | 教育部重大项目(308006); 国家杰出青年科学基金(40925006) |
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| 摘 要： | 长江中下游地区繁昌火山盆地在早白垩世先后发育3个喷发旋回:中分村旋回、赤沙旋回和蝌蚪山旋回。其中蝌蚪山旋回下段以凝灰质粉砂岩为主,中段为玄武岩和流纹质凝灰岩互层,上段以流纹岩为主。蝌蚪山玄武岩中的辉石既存在斑晶中也存在于基质中,这两种辉石在成分上有明显的差异,从斑晶辉石的核部到边部再到基质的核部,化学成分由富镁向富铁演化,显示出拉斑玄武岩系列的特点,辉石成因的判别图解表明其寄主岩浆为板内拉斑玄武岩,但其化学成分的变化趋势又表明岩浆在结晶分异的过程中向着碱性系列演化。根据单斜辉石与熔体平衡原理计算出玄武岩形成时的温度约为1 100℃,压力约为400MPa,相应的深度约为15km,证明岩浆在地壳中有过短暂的停留,并在上地壳部位发生分离结晶作用后喷出地表快速冷凝形成蝌蚪山玄武岩。
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| 关 键 词： | 单斜辉石 矿物学 早白垩世 蝌蚪山 拉斑玄武岩 |
MINERALOGICAL CHARACTERISTICS AND GEOLOGICAL SIGNIFICANCE OF CLINOPYROXENE FROM THE EARLY CRETACEOUS KEDOUSHAN BASALT,MIDDLE-LOWER YANGTZE RIVER REGION |
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| WEN Shi-hua,HOU Tong.MINERALOGICAL CHARACTERISTICS AND GEOLOGICAL SIGNIFICANCE OF CLINOPYROXENE FROM THE EARLY CRETACEOUS KEDOUSHAN BASALT,MIDDLE-LOWER YANGTZE RIVER REGION[J].Journal of Mineralogy and Petrology,2011,31(3). |
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| Authors: | WEN Shi-hua HOU Tong |
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| Institution: | WEN Shi-hua,HOU Tong State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences(Beijing),Beijing 100083,China |
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| Abstract: | Three eruptional cycles occurred in the early Cretaceous in Fanchang volcanic basin which is located in the Middle-lower Yangtze River Region,they are Zhongfencun cycle,Chisha cycle and Kedoushan cycle respectively.The lower part of Kedoushan cycle consists predominantly of tuffaceous aleurolite,mid part consists of basalt interbedded with rhyolitic tuff,and the upper part is composed predominantly of rhyolite.Clinopyroxene exists both in phenocryst and matrix,which have obvious differences in composition.C... |
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| Keywords: | clinopyroxene mineralogy early Cretaceous Kedoushan tholeiite |
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