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为了揭示贵州花溪区海相P-T界线附近粘土岩的成因及物质来源,采用X射线衍射(XRD)、扫描电子显微镜(SEM)以及差示扫描量热法(DSC),对粘土层中粘土矿物的精细结构进行了深入的研究.结果表明,样品中的粘土矿物共有两种物质来源.样品YN06质地致密,粘土颗粒具有一定的定向性,主要粘土矿物成分为伊利石和少量绿泥石.粘土矿物颗粒具有不规则的轮廓及参差不齐的边缘;样品脱羟基反应温度为590℃,表明样品中的伊利石主要为tv结构,来源于陆地机械风化作用.其余五件样品主要粘土矿物为伊蒙规则混层和伊利石以及少量蒙脱石、绿泥石,脱羟基温度均大于600℃,表明样品中的粘土矿物主要以cv结构为主,含有少量的tv结构,指示粘土岩主要来源于火山物质的蚀变并伴随部分陆源碎屑物质沉积形成.
In order to reveal the origin and material sources of clay rocks near the marine PT boundary in Huaxi District, Guizhou Province, the clay minerals in the clay layer were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential scanning calorimetry Fine structure.The results show that there are two sources of clay minerals in the sample.The sample YN06 has a dense texture and the clay particles have a certain orientation and the main clay minerals are illite and a small amount of chlorite.The clay mineral particles With irregular profiles and jagged edges.The sample dehydroxylation reaction temperature is 590 ℃, indicating that the illite in the sample is mainly tv structure, derived from the mechanical weathering on the land.The remaining five samples of the main clay minerals for the Emmon rule Mixed layer and illite and a small amount of montmorillonite, chlorite, dehydroxylation temperature are greater than 600 ℃, indicating that the sample of clay minerals mainly cv structure, containing a small amount of tv structure, indicating that the clay rock is mainly derived from volcanic material The alteration is accompanied by the deposition of some terrigenous clastic matter.