高压物理学报

泥质岩及其变质脱水产物中含水矿物稳定性的实验研究

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李营 ¹^,² , 唐红峰 ¹ , 刘丛强 ¹ , 周志华 ¹^,²

高压物理学报 | 2006,20(3): 257-264

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高压物理学报 | 2006 , 20 (3) : 257 -264

泥质岩及其变质脱水产物中含水矿物稳定性的实验研究

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李营¹^,², 唐红峰¹, 刘丛强¹, 周志华¹^,²

作者信息

^1.中国科学院地球化学研究所地球深部物质与流体作用地球化学研究室，贵州贵阳　550002

^2.中国科学院研究生院，北京　100039

作者简介:

李营（1978—），男，博士研究生，实验地球化学专业. E-mail：traceelement@sohu.com

Experimental Study on the Stability of Hydrous Minerals in Natural Pelitic System

Ying LI¹^,², Hong-Feng TANG¹, Cong-Qiang LIU¹, Zhi-Hua ZHOU¹^,²

Affiliations

^1.Laboratory for Study of the Earth's Interior and Geofluids' Institute of Geochemistry, Chinese Academy of Science, Guiyang 550002, China

^2.Graduate School of Chinese Academy of Sciences, Beijing 100039, China

出版时间: 2006-09-05

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摘要

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俯冲带沉积物（岩）的变质脱水作用对俯冲带流体组成、矿物和同位素组成及岛弧岩浆演化具有深远影响。以天然泥质岩为研究对象，通过高温高压实验，确定了1.5~3.5 GPa、746~930 ℃条件下，俯冲带沉积物中绿泥石、绢云母及其脱水后产物角闪石和黑云母在俯冲带的稳定范围，绘制了高温高压条件下泥质岩体系相图。研究结果表明，在泥质岩体系中，绿泥石是最早发生变质脱水的矿物，在俯冲带50 km深度以上全部分解，其分解产物——角闪石可携带流体进入到俯冲带85 km处，黑云母则可俯冲至120 km或更深的深度，据此可知，在俯冲带深部，沉积物完全脱水的深度范围（≥120 km）要大于蚀变洋壳（90~100 km）。

关键词

俯冲带 / 泥质岩 / 含水矿物 / 变质脱水作用

Abstract

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Metamorphic dehydration of subducted sediments is of importance in understanding the composition of slab-derived fluids, the mineral and isotope composition in subduction zone, which is also important for understanding the evolution of arc magmas. The stability of chlorite, sericite, amphibole and biotite has been identified in natural pelitic system at pressures 1.5~3.5 GPa, and at temperatures 746~930 ℃ by high pressure experiments on natural pelite. The systematic diagram suggests that with the increasing of pressure and temperature chlorite completely decomposes at lower depth <50 km. The run production of this process-amphibole can be subducted to 85 km, and biotite devolatilizes at the depth ≥120 km in subduction zone. This leads to the conclusion that subducted sediments can be subducted into more deep depth (≥120 km) than basaltic oceanic crust.

Key words

subduction zone / pelite / hydrous mineral / metamorphic dehydration

引用本文

李营, 唐红峰, 刘丛强, 周志华. 泥质岩及其变质脱水产物中含水矿物稳定性的实验研究. 高压物理学报, 2006 , 20 (3) : 257 -264 .

Ying LI, Hong-Feng TANG, Cong-Qiang LIU, Zhi-Hua ZHOU. Experimental Study on the Stability of Hydrous Minerals in Natural Pelitic System[J]. Chinese Journal of High Pressure Physics, 2006 , 20 (3) : 257 -264 .

基金

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中国科学院知识创新工程重要方向项目(KZCX2-SW-124)
国家自然科学基金项目(40272038)

参考文献

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参考文献引证文献

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2006年第20卷第3期

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接收时间：2005-09-30
首发时间：2026-11-01
出版时间：2006-09-05

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收稿日期：2005-09-30
修回日期：2006-01-12

基金

中国科学院知识创新工程重要方向项目(KZCX2-SW-124)

国家自然科学基金项目(40272038)

作者信息

^1.中国科学院地球化学研究所地球深部物质与流体作用地球化学研究室，贵州贵阳　550002

^2.中国科学院研究生院，北京　100039

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2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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