沉积岩中地开石—高岭石混层矿物的发现及成因探讨
DISCOVERY OF MIXED-LAYER DICKITE-KAOLINITE IN SEDIMENTARY ROCK AND DISCUSSION ON ITS ORIGIN
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摘要: 1979年夏,笔者在河北省曲阳县灵山镇附近的石炭纪地层中,发现一种晶体巨大的高岭石族矿物,最大的晶粒沿C轴长度可达2厘米,(001)面的直径可达0.5毫米。由于晶粒巨大,易于挑选,引起了我们对其单矿物进行研究的兴趣。用多种手段对该矿物进行了矿物学研究,发现它既有高岭石的特征,又兼有地开石的特征,但它既不是简单的高岭石,又不是简单的地开石,而是一种地开石-高岭石的混层矿物。Abstract: A kind of crystal of mixed-layer dickite-kaolinite has been found in sedimentary rock at Lingshan, Quyang County, Hebei Province. The length of its grain is 2mm and its diameter is 0.5mm long. The characteristics of this mineral are as follows: its differential thermogram with midtemperature; endothermic polypeaks at 550℃ and 656℃ and a small peak at 685℃; infrared spectrogram with 3705, 3695,3670, 3655, 3620 and 3598cm-1 absorptions of high frequency range; X-ray diffraction curve with continuing four classes of strong peaks,and its I(004)/I(006)=2.88.
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