摘要
本文除概略地列举了"H_8含矿白云岩"的野外产状、岩石学和地球化学及同位素年龄等一些证据外,着重讨论了"H_8含矿白云岩"(包括作者和前人的共计141件样品)氧、碳同位素值特征,认为介于典型水成和典型火成碳酸盐之间.其中残留的泥晶灰岩的氧、碳同位素组成,却与宽沟北沉积灰岩是一致的.说明“H_8含矿白云岩"原来就是沉积的泥晶灰岩,后经白云石化和受变质重结晶作用形成的;并非是岩浆碳酸岩因受壳源污染和受变质作用的结果.
In the last decate O,C isotopes was applied to solving the genesis of Baiyan Obo H_8 dolomite. Sample analysis shows that its values differ either from the typical sedimentary carbonate rock or from the typical magmatic carbonatite. Therefore, arguements are kept among geologists who once worked at Baiyan Obo ore deposit. Summed up three view points can be distinquished i.e. sedimentary carbonate rock, magmatic carbonatite and carbonate rock formed by 1:1 mixation of marine material and deepsourced material.Samples are collected by the author from controversial points along 32 line and 21 line. O,C isotope analysis is similar to that of limestone in the north of Kuangou Fracture so the author argue that H_8 dolomite is originaly sedimentary carbonate rock.
出处
《地质找矿论丛》
CAS
CSCD
1992年第2期46-54,共9页
Contributions to Geology and Mineral Resources Research
