论文部分内容阅读
在浙西石炭纪地层中存在与地层整合产出的层状硅质岩。硅质岩中ＦｅＯ、ＭｎＯ、ＴｉＯ２、Ａｌ２Ｏ３、ＭｇＯ、ＣａＯ、Ｎａ２Ｏ、Ｋ２Ｏ等含量相对较高，富集Ａｓ、Ｓｂ、Ｂｉ、Ａｕ、Ａｇ、Ｇａ，Ｆｅ２Ｏ３／ＦｅＯ、ＳｉＯ２／Ａｌ２Ｏ３、ＳｉＯ２／（Ｎａ２Ｏ＋Ｋ２Ｏ）、ＳｉＯ２／ＭｇＯ比值较小，稀土元素总量低，Ｃｅ弱负异常，重稀土相对富集，包裹体富含气相组份ＣＨ４、ＣＯ２、Ｎ２、ＣＯ、Ｈ２，具热水沉积硅质岩的地球化学特征。在Ｆｅ—Ｍｎ—（Ｎｉ＋Ｃｏ＋Ｃｕ）三角图及ＳｉＯ２—Ａｌ２Ｏ３、ＳｉＯ２—Ｆｅ２Ｏ３图上均属于热水沉积硅质岩。硅质岩中硅、氧同位素也显示其热水成因之特点。硅质岩的硅同位素和稀土元素Ｃｅ／Ｃｅ※值表明本区层状硅质岩主要是在浅海环境下沉积的。硅质岩的形成温度较高，为９８℃～１５２℃
In the Carboniferous strata of Zhejiang Province, there exist layered siliceous rocks integrated with the strata. The contents of FeO, MnO, TiO2, Al2O3, MgO, CaO, Na2O and K2O in the cherts are relatively high and are enriched in As, Sb, Bi, Au, Ag, Ga, Fe2O3 / Na2O + K2O), the ratio of SiO2 / MgO is small, the total amount of rare earth elements is low, the weak anomaly of Ce is, and the heavy rare earth is relatively enriched. The inclusions are rich in gaseous components of CH4, CO2, N2, CO, H2, Geochemical characteristics of rocks. In the Fe-Mn- (Ni + Co + Cu) trigonometry and SiO2-Al2O3, SiO2-Fe2O3 are hydrous sedimentary chert. Siliceous rocks of silicon, oxygen isotopes also show the characteristics of its hot water. The silicon isotopes of the cherts and the Ce / Ce ※ values of the rare earth elements indicate that the stratiform cherts in this area are mainly deposited in shallow sea environments. The formation temperature of chert is higher from 98 ℃ to 152 ℃