重庆高燕锰矿床的主量元素特征及其成因意义

高燕锰矿区矿层主量元素比值特征说明锰矿层沉积物主要来自海洋组分,沉积于较深的、弱氧化环境,锰矿形成可能与成岩作用有关。相关性分析结果显示锰矿层中Fe由陆源物质带入,Mn主要来自海洋组分,P主要来自富磷海洋生物。通过R型聚类分析将主量元素分为三组,分别代表陆源沉积物、海洋自生产物和生物沉积,组间相关性反映锰矿具生物成因特点。综上,认为高燕锰矿为海水中锰质经生物作用初始富集后在较深的、弱氧化环境下通过成岩作用所形成。

Characteristics of Major Elements in Gaoyan Manganese Deposits, Chongqing City and Its Genetic Significance

The ratio of major elements of Gaoyan manganese ore samples indicate that the sediments in strata of manganese ore mainly derived from marine. Manganese ore, probably formed during the diagensis stage, were deposited in a deep and weak oxidation environment. The result of correlation analysis implying that Fe in strata of manganese ore derived from terrigenous materials, while Mn mainly came from marine. It also indicated that P originated in phosphorus-rich marine organism. Those major elements can be classified into three groups, which implies terrigenous materials, marine authigenic materials and biogenic deposition, according to the result of R-type cluster analysis. The correlations between these groups shows biogenic characteristic of manganese ore. In conclusion, Mn deriving from marine was preliminary enriched through biogenic processes and finally deposited in a deep and weak oxidation environment during the diagensis stage, so as to form Gaoyan manganese ore deposit.