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在浙江安吉杭垓地区的上奥陶统黄泥岗组和长坞组分别发现42层和5层钾质斑脱岩夹层,对其中部分斑脱岩开展的X衍射分析显示,其主要成分为石英、伊利石、蒙脱石、高岭石和极少量钠长石;该套斑脱岩具有高钾特征,为钾玄岩系列;稀土元素成分分析显示具有高∑REE含量,轻、重稀土分异明显,具较强负铕异常,球粒陨石标准化稀土配分曲线具有右倾的特征;富集Rb、Th、U、K,亏损Ba、Sr、P等。SHRIMP锆石U-Pb测年值为453±4~444.7±3.3 Ma。成因地球化学分析显示,这些斑脱岩主要形成于板内构造环境,为晚奥陶世凯迪期广西运动构造—岩浆事件的产物。
In the Upper Ordovician Huangnigang Formation and the Changwu Formation in Hangji of Zhejiang Province, 42 and 5 karats of kaolinite diseached rocks were found respectively. The X-ray diffraction analysis of some of the bentonite rocks showed that the main components were Quartz, illite, montmorillonite, kaolinite and a very small amount of albite. This set of bentonite has the characteristics of high potassium and is a series of potash minerals. The analysis of REE shows that it has high ΣREE content, light and heavy REE It is obvious that there is a strong negative Eu anomaly, and the normalized RARE curve of chondrite melatonite has the right-dip feature; enrichment of Rb, Th, U, K, depletion of Ba, Sr, P and so on. SHRIMP zircon U-Pb dating is 453 ± 4 ~ 444.7 ± 3.3 Ma. Genetic geochemical analysis shows that these bentonites are mainly formed in the intracontinental tectonic setting and are the product of the tectonic-magmatic events of the Late Ordovician Kaidi period in Guangxi.