矾山碱性杂岩体中发现碳酸岩

北京大学学报（自然科学版）

矾山碱性杂岩体中发现碳酸岩

牟保磊¹, 邵济安¹, 边振辉²

¹北京大学地质学系，北京，100871; ²河北矾山磷矿，河北涿鹿矾山磷矿，075641

收稿日期:1997-11-28 出版日期:1999-03-20 发布日期:1999-03-20

Discovery of Carbonatite in the Fanshan Alkaline Igneous Complex in Hebei Province, China

MU Baolei¹, SHAO Ji'an¹, BIAN Zhenhui²

¹Department of Geology, Peking University, Beijing, 100871; ²Fanshan Phosphorus Mine, Hebei Province, China, 075641

Received:1997-11-28 Online:1999-03-20 Published:1999-03-20

摘要/Abstract

摘要： 矾山杂岩体是中心型碱性超基性岩——碱性岩侵入体。它由三期侵入岩组成，在三期岩石形成之后有碳酸岩和正长岩脉形成。碳酸岩主要岩石类型包括：黑云母方解石碳酸岩、正长石—黑云母方解石碳酸岩、黄铁矿—方解石碳酸岩等。碳酸岩锶的含量为3364×10^-6～19263×10^-6, 钡的含量为323×10-6～378×10^-6。碳酸岩的稀土元素∑REE为323×10^-6～551×10^-6, 其δEu值0.99～1.1，(La/Yb)_N为291.9～759.4。碳酸岩的δ¹⁸O值是+8.6×10^-3～+10.2×10^-3, δ¹³C为-4.9×10^-3。根据上述事实认为碳酸岩的物质源自岩浆。

关键词: 矾山, 碱性杂岩体, 碳酸岩

Abstract: The Fanshan complex is central type alkaline ultrabasic rock-alkaline rock intrusion. It was formed by three period intrusions and all period rocks was penetraed by carbonatites and synite vein rocks. The main type of the carbonatites rock includes: biotite calcite carbonatite, orthoclase-biotite calcite carbonatite, pyrite-calcite carbonatite and so on. Content of Strontium is 0.003364-0.019263, and content of Barium is 0.000323-0.000378 in the carbonatites. The ∑REE is 0.000323-0.000551, and the δEu value is 0.99-1.1, and the (w(La)/w(Yb))_N ratio is 291.9-759.4 in the carbonatite. The δ¹⁸O value of the carbonatite is +0.0086-+0.0102, and the δ¹³C value of carbonatite is -0.0049. On the basic facts described above, it is thought that the carbonatite originated basically from magma.

Key words: Fanshan, alkaline igneous complex, carbonatite

中图分类号:

P558

牟保磊, 邵济安, 边振辉. 矾山碱性杂岩体中发现碳酸岩[J]. 北京大学学报（自然科学版）.

MU Baolei,SHAO Ji'an,BIAN Zhenhui. Discovery of Carbonatite in the Fanshan Alkaline Igneous Complex in Hebei Province, China[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.