FTIR spectroscopy of Ti-chondrodite, Ti-clinohumite, and olivine in   deeply subducted serpentinites and implications for the deep water cycle

doi:10.1007/s00410-014-0992-8

CORC > 北京大学 > 地球与空间科学学院

	FTIR spectroscopy of Ti-chondrodite, Ti-clinohumite, and olivine in deeply subducted serpentinites and implications for the deep water cycle
	Shen, Tingting ; Hermann, Jorg ; Zhang, Lifei ; Padron-Navarta, Jose Alberto ; Chen, Jing
刊名	contributions to mineralogy and petrology
	2014
关键词	Ti-chondrodite Ti-clinohumite Olivine ATR-FTIR UHP metamorphism Tianshan QUANTITATIVE ABSORBENCY SPECTROSCOPY NOMINALLY ANHYDROUS MINERALS COESITE-BEARING ECLOGITE WESTERN TIANSHAN UPPER-MANTLE PERIDOTITE XENOLITHS HIGH-PRESSURE MAGMA ASCENT INCORPORATION MECHANISMS ANTIGORITE SERPENTINITE
DOI	10.1007/s00410-014-0992-8
英文摘要	Separated olivine grains from a deeply subducted serpentinized wehrlite (Changawuzi in the western Tianshan ultrahigh-pressure belt, China) were analysed with unpolarized transmission FTIR and the Ti contents were determined using LA-ICP-MS. The major bands in the olivine spectra display striking similarities to Ti-clinohumite and are interpreted as OH in lamellae. The quantification of the water content in lamellae requires calibration of the IR-absorption for such bands. We have obtained a new absorption coefficient for Ti-clinohumite of 0.125+/-0.017 ppm cm(2) based on polarized FTIR measurements on three orthogonal sections through a large single crystal of Ti-clinohumite from Val Malenco, which has a known water content of 1.53 wt%. The resulting water content in olivine using this calibration factor ranges from 440 to 2,600 ppm and correlates positively with the Ti content that ranges from 130 to 1,400 ppm. For the quantification of the water content in Ti-chondrodite and Ti-clinohumite that are associated with olivine, we developed a new method using attenuated total reflectance FTIR spectroscopy. Ti-chondrodite and Ti-clinohumite display similar IR bands at similar to 3,562, 3,525 and similar to 3,583-3,586 cm(-1). As in olivine, the water content and Ti content correlate in both Ti-clinohumite and Ti-chondrodite, indicating an inter-growth of these minerals, which has been confirmed by TEM analyses. Our results confirm previous suggestions that there is a strong correlation between the Ti content of ultramafic rocks and their capacity to transport water to the deeper mantle in subduction zones beyond conditions where hydrous phases are stable.; Geochemistry & Geophysics; Mineralogy; SCI(E); 2; ARTICLE; shentt@pku.edu.cn; 4; 167
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155493]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Shen, Tingting,Hermann, Jorg,Zhang, Lifei,et al. FTIR spectroscopy of Ti-chondrodite, Ti-clinohumite, and olivine in deeply subducted serpentinites and implications for the deep water cycle[J]. contributions to mineralogy and petrology,2014.
APA	Shen, Tingting,Hermann, Jorg,Zhang, Lifei,Padron-Navarta, Jose Alberto,&Chen, Jing.(2014).FTIR spectroscopy of Ti-chondrodite, Ti-clinohumite, and olivine in deeply subducted serpentinites and implications for the deep water cycle.contributions to mineralogy and petrology.
MLA	Shen, Tingting,et al."FTIR spectroscopy of Ti-chondrodite, Ti-clinohumite, and olivine in deeply subducted serpentinites and implications for the deep water cycle".contributions to mineralogy and petrology (2014).