摘要
豫西太华群一名已沿用了30余年,在这套中深变质岩系中,过去从未发现生物化石,前人根据变质程度及构造格架一直将其归入太古宇。笔者对小秦岭地区这套中深变质岩系的石墨片麻岩、石英岩、长石石英岩及大理岩,采用浸解法、切片法研究,发现了一批微体古生物化石,文中介绍了微体化石的赋存层位及岩性。在参考加拿大、澳大利亚、中国鞍山等地国内外已有资料后,笔者认为豫西小秦岭地区太华群上亚群的时代应归属早元古代为宜。
The term the Archean Taihua Group in western Henan has been used more than thirty years, but no fossils have been found in it. In recent years, by using the methods of thin-section and maceration the author has discovered many microfossils in Xiaoqinling region, including spheroids, filamentous algal, plant fragments and unknown forms, in graphite gneisses, quartzites, feldspathic quartzites and marbles of medium- to high-grade metamorphic complexes. The horizons, in which microfossils were found, and their petrological characteristics are described in this paper. A comparison is made between the materials found in the study area and those in other places of China (Anshan and Dabie Mountains). Thus the author comes to a conclusion that the upper subgroup of the Taihua Group in the Xiaoqinling area in western Henan should be of Proterozoic age.
出处
《地质论评》
CAS
CSCD
北大核心
1996年第5期459-464,T001,共7页
Geological Review
