| 造山带中富集型上地幔的成因——以萨尔托海蛇绿岩块为例 |
| |
| 关键词: |
| 基金项目: |
|
| 摘要点击次数: 5186 |
| 全文下载次数: 5446 |
| 摘要: |
| GENESIS OF ENRICHED UPPER MANTLE IN OROGENIC ZONE——A CASE STUDY OF THE SAERTUOHAI OPHIOLITIC BLOCK |
| The mantle peridotite at the bottom of ophiolitic section in the orogenic zone is direct sample of enriched upper mantle. Its geochemical characteristics are strong depletion of major elemen Al2O3, TiO2, CaO, Na2O and K2O, but are strong enrichment of REE, trace elements and 87Sr/86Sr. Combining with 143Nd/144Nd<0.511836, it shows that the mantle peridotite belongs to a source of incompatile element enrichment pattern.Major mechanism of formation of enriched upper mantle is "mantle metasomatism". Low-degree melting magma bearing incompatible elements and fluids of enrichment Ca-LREE react with depleted upper mantle peridotite to create a upper mantle of enrichment incompatible elements through dike and permeable metasomatism.Tectonic environment of formation of enriched upper mantle is oceanic crust displacement from the oceanic mid-ridge to the orogenic zone.Th enriched upper mantle exists not only in the continental aere but in the orogenic zone. It may be a chemical reaction occurred in interior of the whole earth. |
| HAO Zi-guo,WANG Xi-bin,BAO Pei-sheng.1991.GENESIS OF ENRICHED UPPER MANTLE IN OROGENIC ZONE——A CASE STUDY OF THE SAERTUOHAI OPHIOLITIC BLOCK[J].Acta Geoscientica Sinica,12(1):159-166. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|