| 辽南斑状金伯利岩岩相学特征及其成因研究 |
| |
| 引用本文： | 王思琪,郑建平,韩双,王俊烈.辽南斑状金伯利岩岩相学特征及其成因研究[J].地质学报,2020,94(9):2676-2686. |
| |
| 作者姓名： | 王思琪 郑建平 韩双 王俊烈 |
| |
| 作者单位： | 1) 辽宁省第六地质大队有限责任公司，辽宁省许洪斌创新工作室，大连，116200;2) 中国地质大学(武汉)地球科学学院，武汉，430074 |
| |
| 基金项目： | 本文为中国地质调查局战略性研究项目(编号12120114066301)、辽宁省自然资源地质勘查项目(编号LNZC2019- 0078- 20)资助的成果。 |
| |
| 摘 要： | 辽南金伯利岩岩区是我国最大的原生金刚石矿产区，该区金刚石主要寄主岩石类型为斑状金伯利岩。橄榄石是金伯利岩中最重要的造岩矿物，根据其结构特征可以分为橄榄石粗晶、橄榄石斑晶以及基质中微细粒三个世代。本文将岩相学特征和前人研究成果相结合，构建辽南斑状金伯利岩岩浆起源、上升、喷发和成岩模型，探讨各世代矿物的形成过程。具体包括：深部交代地幔部分熔融，形成初始碳酸盐岩浆；初始岩浆上升过程中捕获的岩石圈地幔橄榄岩不断溶解(形成橄榄石粗晶)，岩浆成分发生改变，成为金伯利岩岩浆；金伯利岩岩浆迅速上升侵位，至地表处爆破喷发，最后冷却固结形成包含粗晶及其他两个世代橄榄石的斑状金伯利岩。
|
| 关 键 词： | 斑状金伯利岩 岩相学 橄榄石类型 岩石成因 辽南 |
| 收稿时间： | 2020/4/17 0:00:00 |
| 修稿时间： | 2020/8/4 0:00:00 |
Petrography and petrogenesis of porphyritic kimberlite from South Liaoning |
| |
| WANG Siqi,ZHENG Jianping,HAN Shuang,WANG Junlie.Petrography and petrogenesis of porphyritic kimberlite from South Liaoning[J].Acta Geologica Sinica,2020,94(9):2676-2686. |
| |
| Authors: | WANG Siqi ZHENG Jianping HAN Shuang WANG Junlie |
| |
| Abstract: | The kimberlite rock region from South Liaoning is the largest primary diamond producing area in China. Porphyritic kimberlites, which are the main host rock of diamond, are typically dominated by olivine. We have divided olivine in kimberlite into three generations according to structural characteristics: coarse- grained olivine, olivine phenocrysts, fine- grained olivine crystals in matrix. Here we build an integrated model to show the origin, ascent, eruption, and diagenesis of porphyritic kimberlite magma from South Liaoning and its petrographic characteristics. Synthesising our data with previous studies, we discuss the formation process of minerals in each generation. These include partial melting of the mantle peridotite with phlogopite that formed the initial carbonatic magma. During ascension, the orthopyroxene in the lithospheric mantle peridotite was continuously dissolved forming coarse- grained olivine. When the magma components could no longer change, a stable kimberlite magma was formed. The magma continued to ascend to the surface rapidly and erupted. Finally, the magma gradually cooled and consolidated into the porphyritic kimberlites that included coarse- grained and two other generations of olivine. |
| |
| Keywords: | porphyritic kimberlite petrography classification of olivine petrogenesis South Liaoning |
|
| 点击此处可从《地质学报》浏览原始摘要信息 |
| 点击此处可从《地质学报》下载免费的PDF全文 |
|
