REE geochemical characteristics and depositional environment of the black shale-hosted Baiguoyuan Ag-V deposit in Xingshan,Hubei Province,China

By means of techniques such as inductively coupled plasma-mass spectrometry (ICP-MS) and X-ray fluorescence spectrometry (XRF),REE geochemical characteristics and depositional environment of the black shales in Baiguoyuan Ag-V deposit,Xingshan,Hubei Province,were studied in this work. The black shales in a typical TC5 profile of Doushantuo Formation of upper Sinian period were obviously enriched in REE,especially in LREE. The REE patterns of the investigated samples normalized by Post Archean Australian Shale (PAAS) showed a flat or slight rightward inclination. The characteristic elements,their ratio and correlation diagrams showed that it should be hot-water deposit and the black shale in the study area was of a sedimentary origin. Redox sensitive metal elements pattern,trace elements index measurement in anoxic environment,Ce anomaly and δEu negative anomaly showed that the deposit environment of the black shales was a reducing and anoxic one and a slight change of the sea level could be identified. The samples relatively focused on the superimposed area of sedimentary rock and basalt in the diagram of La/Yb-ΣREE and La/Yb-Ce/La. So there might be accession of hot-water sedimentation during the period of the formation of the black rock series,mostly in normal terrigenous sedimentation with the participation of deep hot-water deposit.     

武汉市局部中心城区汞土壤污染现状及其成因的初步研究

本主要针对武汉市局部中心城区土壤的汞污染分布,依据地球化学成图对其污染现状进行调查研究评述。通过运用统计与评价模型发现该地区土壤中的汞污染相当严重,并对汞在该地区土壤中的污染成因开展了初步研究。     

埃塞俄比亚金属矿产资源综述

在大量查阅、深刻分析国内外中英文文献以及实地野外调查踏勘的基础上,对埃塞俄比亚国家的金属矿产资源进行了较为详细地概述。研究表明,该国金属矿产资源主要分布在西部、北部和南部绿岩带。从前寒武纪到近代构造构成了埃塞俄比亚地质学的基础。其中低级变质火山沉积岩组合赋存了绝大多数经济矿床,包括金、铂族元素、镍、贱金属（Cu、Pb、Zn）、磷酸盐、铁等,并且其中生代沉积岩含有天然燃料矿产和一些金属矿产如孔雀石、锰矿石和含石膏矿物。分析发现埃塞俄比亚金属矿产资源具有良好的开采和开发前景,特别是金、铂等贵金属,镍等黑色金属,铜等有色金属,铌、钽等稀有金属,铀（钍）等放射性金属。