The Mode of Occurrence and Mineralogy of Komaki Halloysite Deposit and Alteration of its surrounding Granitic Rock
The Mode of Occurrence and Mineralogy of Komaki Halloysite Deposit and Alteration of its surrounding Granitic Rock
复制标题
小牧埃洛石矿床的赋存模式和矿物学及其周围花岗岩的蚀变
DOI：
10.11362/jcssjnendokagaku1961.26.78
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
H. Kameoka
中科院分区：
文献类型：
--
作者：
R. Kitagawa;H. Kameoka
利用x射线粉末衍射、透射电镜和扫描电镜等研究了日本西南部岛根县小木高岭土矿床及其周围花岗岩中粘土矿物的赋存方式和矿物学特征。小木矿床由两个与主岩边界分明的体组成。矿石粘土矿物主要由高岭石、高岭石、云母等粘土矿物组成，并伴有少量蒙脱石。根据黏土矿物组合，将矿床岩石划分为3个蚀变带：第1带（高岭土带）、第2带（高岭土-高岭土带）、第3带（高岭土-云母黏土矿物带）。高岭石带出现在矿床中心，高岭石和云母粘土矿物带穿过高岭石和高岭石带出现在矿床边缘。矿床中充填有高岭石、高岭石、云母粘土矿物和蒙脱石的粘土脉（宽约0.1 ~ 5cm）。其走向以北0 ~ 10°W、东西向和北30°~ 60°W为主，倾角接近垂直。在其周围的花岗质岩石中，蚀变矿物和粘土脉位于较高水平，主要由高岭石和高岭石组成，而云母粘土矿物和蒙脱石主要位于较低水平。泥脉走向主要为N0°~ 10°W、E-W和N30°~ 60°W，倾角接近垂直。研究区发现的裂缝似乎是由北西-东南方向的区域性侧向挤压形成的，大部分粘土矿床是由破碎的英质岩的热液蚀变形成的。粘土脉的组成矿物和围岩中的主要蚀变矿物可能是由热液活动而不是风化作用形成的。
Mode of occurrence and mineralogy of clay minerals in Komaki halloysite deposit, Shimane Prefecture, southwest Japan, and its surrounding granitic rocks have been investigated by means of X-ay powder diffraction and transmission and scanning electron microscopes.The Komaki deposit is composed of two are bodies which are sharply bordered from the host rocks. The clay minerals of ores are composed of halloysite, kaolinite and mica clay mineral associated with a small amount of smectite. The rocks in the deposit are divided into three alteration zones based on the clay mineral assemblages: zone I (halloysite zone), zone II (kaolinite and halloysite zone), and zone III (kaolinite and mica clay mineral zone). The halloysite zone appears at the center of deposit, while the kaolinite and mica clay mineral zone occurs in the margin through the halloysite and kaolinite zone. Clay-veins (ca.0.1-5 cm in width) which are filled with halloysite, kaolinite, mica clay mineral and smectite are observed in the deposit. They have mainly N 0-10°W, E-W and N 30°-60°W of strike and nearly vertical dip.In the surrounding granitic rocks, the altered minerals and the clay-veins situated at higher levels are mainly composed of halloysite and kaolinite, whereas mica clay mineral and smectite are mainly found at lower levels. The clay-veins have mainly N0°-10°W, E-W and N30°-60°W of strike and nearly vertical dip. The fractures found in the studied area seem to be formed by a regional lateral compression of NW-SE directionMost of the clay deposit was formed by hydrothermal alteration of fractured felsitic rocks. The constituent minerals of clay-veins and major altered minerals in the surrounding rocks may be formed by a hydrothermal activity rather then weathering.