西昆仑山普鲁新生代火山岩中包体的发现及其地质意义

张招崇; 肖序常; 王军; 王永

西昆仑山普鲁新生代火山岩中包体的发现及其地质意义

中国地质科学院地质研究所，北京 100037

基金项目:

地质调查项目 DKD2001001

国土资源部科技项目 2001010204

国土资源部科技司重点项目 20001010201

详细信息

作者简介:
张招崇（1965-），男，研究员，主要从事火成岩岩石学和金矿床方面的研究工作

中图分类号: P588.1
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- 被引次数: 0
出版历程
- 收稿日期: 2001-12-26
- 刊出日期: 2002-07-25

Discovery of Enclaves from Cenozoic Pulu Volcanic Rocks of West Kunlun Mountains and Their Geological Implications

Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

摘要

摘要: 报道了在西昆仑于田县南普鲁火山岩首次发现的包体的产出特征与矿物组成特征, 提出其包体为岩浆在高位岩浆房中分离结晶作用形成的堆积相, 并估算了其原始岩浆的成分特征, 结果表明: 其原始岩浆和处于同一火山带的康西瓦火山岩相似, 暗示了它们来自于同一源区.但在高位岩浆房中, 随着分离结晶作用的进行, 岩浆的温度和氧逸度逐渐降低.
- 包体 /
- 分离结晶 /
- 火山岩 /
- 西昆仑
Abstract: In this paper, we report the occurrence and mineral components of the enclaves, firstly discovered in the Cenozoic Pulu volcanic rocks in West Kunlun Mountains, and propose that the enclaves are accumulated by fractional crystallization within high level magma chamber. In addition, we have calculated the compositions of its primary magma. The calculated compositions are similar to those of the Kangxiwa volcanic rocks that belong to a same volcanic belt with the Pulu volcanic region, suggesting that they could have originated from the same source region. However, the temperatures and oxygen fugacity of magmas at high level magma chamber decreased along with fractional crystallization.
- enclave /
- fractional crystallization /
- volcanic rocks /
- West Kunlun Mountains

HTML全文

图 1 包体的显微照片(+, d=44 mm)

照片说明矿物具有明显的结晶顺序: 橄榄石→单斜辉石→斜长石; Ol.橄榄石; Cpx.单斜辉石; Pl.斜长石

Fig. 1. Photomicrograph of enclave in volcanic rocks from West Kunlun Mountain, showing a clearly crystal sequence: olivine→clinopyroxene→plagioclase

下载: 全尺寸图片幻灯片

表 1 西昆仑普鲁火山岩中的包体矿物电子探针分析结果

Table 1. Microprobe analysis of minerals in enclave from Pulu volcanic rocks in West Kunlun Mountain

表 2 西昆仑普鲁火山岩中的斑晶矿物电子探针分析结果

Table 2. Microprobe analysis of phenocrysts from Pulu volcanic rocks in West Kunlun Mountain

参考文献(14)

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