| 冀北坳陷高于庄组含锰岩层地球化学特征 |
| |
| 引用本文： | 汪凯明,罗顺社.冀北坳陷高于庄组含锰岩层地球化学特征[J].矿产与地质,2010,24(2):187-192. |
| |
| 作者姓名： | 汪凯明 罗顺社 |
| |
| 作者单位： | 油气资源与勘探技术教育部重点实验室·长江大学,湖北,荆州,434023;长江大学地球科学学院,湖北,荆州,434023 |
| |
| 基金项目： | 中国石油化工股份有限公司海相油气勘探前瞻性项目 |
| |
| 摘 要： | 冀北坳陷中元古界长城系高于庄组下部发育一套含锰岩层,厚60～80m,主要为深灰色—黑色含锰白云岩,多含泥质。文章对高于庄组82件碳酸盐岩样品进行了微量元素分析,结合地史演化、沉积特征以及地球化学特征,表明研究区内Mn主要来源于串岭沟—大红峪期的海底火山喷发活动,一部分锰质随海底火山作用向海水中迁移,另一部分随岩浆喷溢冷却形成火山岩熔岩系,经风化作用后、搬运至区内,在闭塞、滞留和缺氧的碳酸盐岩潮下坪环境富集成岩。
|
| 关 键 词： | 含锰岩层 地球化学特征 高于庄组 中元古界 冀北坳陷 |
Geochemical characteristics of manganese-bearing sequences of Gaoyuzhuang formation in the north Hebei depression |
| |
| WANG Kai-ming,LUO Shun-she.Geochemical characteristics of manganese-bearing sequences of Gaoyuzhuang formation in the north Hebei depression[J].Mineral Resources and Geology,2010,24(2):187-192. |
| |
| Authors: | WANG Kai-ming LUO Shun-she |
| |
| Institution: | 1. Key Laboratory of Exploration Technology for Oil and Gas Resources,Yangtze University,Jingzhou,Hubei 434023; 2. College of Geoscience,Yangtze University,Jingzhou,Hubei 434023) |
| |
| Abstract: | Manganese-bearing sequences is widely distributed at the lower part of Gaoyuzhuang formation of the Mesoproterozoic Changcheng system in the north Hebei depression. The layer thickness is about 60～80m,most of which are composed of manganese-bearing dolostone. The 82 pieces of rock samples taken from Gaoyuzhuang formation are made chemical analysis. The results indicate that there is a positive correlation among the elements of K,Ti,V,Rb,Sc and Th of manganese-bearing sequences. Sr/Ba value suggests that the manganese-bearing sequences are deposited from marine environment of low-salinity. Mn/Fe is extremely high,resulted from strong fractionation between manganese and iron during transportation and metallization. The correlation of Sr,V,Zn and Mn displays that the manganese and provenance is from the same place. Analysis of sedimentary features,geological evolvement and geochemical characteristics indicates that the manganese is mainly origin from the submarine volcanism during the period of Chuanlinggou-Dahongyu formations. One part of manganese is transported to sea water by the submarine volcanism,and another part is diagenesis to volcanic rocks with the volcanic eruption. Manganese-bearing district from the weathering and transportation is then in occlusive and anoxic platform subtidal zone setting where the Manganese-bearing sequences are deposited. |
| |
| Keywords: | manganese-bearing sequences geochemical characteristics Mesoproterozoic Gaoyuzhuang formation north Hebei depression |
| 本文献已被 维普 万方数据 等数据库收录！ |
|
