[논문]비정질 파이로프의 저온 압축에 따른 구조 변화를 이용한 멀티 앤빌 프레스의 상온 압력-부하 보정

이주호; 김용현; 이아침; 김은정; 이서영; 이성근

doi:10.22807/kjmp.2022.35.1.65

비정질 파이로프의 저온 압축에 따른 구조 변화를 이용한 멀티 앤빌 프레스의 상온 압력-부하 보정
Pressure-load Calibration of Multi-anvil Press at Ambient Temperature through Structural Change in Cold Compressed Amorphous Pyrope 원문보기

광물과 암석 = Korean journal of mineralogy and petrology, v.35 no.1, 2022년, pp.65 - 73

이주호 (서울대학교 지구환경과학부) , 김용현 (서울대학교 지구환경과학부) , 이아침 (서울대학교 지구환경과학부) , 김은정 (서울대학교 지구환경과학부) , 이서영 (서울대학교 지구환경과학부) , 이성근 (서울대학교 지구환경과학부)

초록
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지구/행성 내부의 다양한 지질학적 과정을 이해하기 위해서는 고온-고압 환경에서 지구 내부 구성물질의 특성을 이해하는 것이 필수적이다. 이러한 고압환경을 생성하기 위하여 사용되는 멀티 앤빌 프레스(multi-anvil press)는 주로 상부맨틀조건의 극한 상황을 재현하는데 사용된다. 멀티 엔빌프레스의 지질학적 사용을 위한 필수 보정 과정 중 하나는 압력을 생성하기 위한 프레스의 유압과 실제로 시료에 가해지는 압력 사이의 관계인 압력-부하 보정(pressure-load calibration)이다. 압력-부하 보정은 일반적으로 고온-고압 조건에서는 결정질 물질의 상전이를 이용해서 이루어지는데, 고온에서의 경우와 달리 저온(상온)의 경우 상전이 과정이 상대적으로 비효율적이므로 압력-부하 보정의 다른 방법론이 요구된다. 본 연구에서는 파이로프 조성(Mg₃Al₂Si₃O₁₂)의 비정질(비정질 파이로프)의 상온에서의 압축(cold compression)에 따라 발생하는 영구적인 고밀도화 현상(permanent densification)과 그 기원이 되는 알루미늄 배위 환경의 변화를 고해상도의 ²⁷Al MAS 및 3QMAS NMR 분광분석을 통해 정량화하고, 이로부터 압력에 따른 알루미늄의 배위수 변화를 이용해 14/8 HT 조립세트(assembly set)와 1,100톤 멀티 앤빌 프레스에 대한 상온에서의 압력-부하 보정을 수행하였다. 본 연구는 NMR분광분석을 이용하여 압력보정을 수행한 최초의 연구결과이며, 비정질 파이로프의 압축-감압에 따른 원자 단위에서의 비가역적 구조 변화는 섭입대 환경과 같은 저온 고압 환경에서 비정질 물질이 겪는 변화와 그에 따른 지질학적 현상의 이해고양에 실마리를 제공한다.

Abstract ▼ AI-Helper

The proper estimation of physical and chemical properties of Earth materials and their structures at high pressure and high temperature conditions is key to the full understanding of diverse geological processes in Earth and planetary interiors. Multi-anvil press - high-pressure generating device - provides unique information of Earth materials under compression, mainly relevant to Earth's upper mantle. The quantitative estimation of the relationship between the oil load within press and the actual pressure conditions within the sample needs to be established to infer the planetary processes. Such pressure-load calibration has often been based on the phase transitions of crystalline earth materials with known pressure conditions; however, unlike at high temperature conditions, phase transitions at low (or room) temperatures can be sluggish, making the calibration at such conditions challenging. In this study, we explored the changes in Al coordination environments of permanently densified pyrope glasses upon the cold compression using the high-resolution 27Al MAS and 3QMAS NMR. The fractions of highly coordinated Al in the cold compressed pyrope glasses increase with increasing oil load and thus, the peak pressure condition. Based on known relationship between the peak pressure and the Al coordination environment in the compressed pyrope glasses at room temperature, we established a room temperature pressure-load calibration of the 14/8 HT assembly in 1,100-ton multi-anvil press. The current results highlight the first pressure-load calibration of any high pressure device using high-resolution NMR. Irreversible structural densification upon cold compression observed for the pyrope glasses provides insights into the deformation and densification mechanisms of amorphous earth materials at low temperature and high pressure conditions within the subducting slabs.

주제어

표/그림 (6)

그림 Fig. 1. ²⁷Al MAS NMR spectra for permanently densified Mg₃Al₂Si₃O₁₂ (pyrope) glasses with increasing oil tonnage up to 615 ton.
$Fig. 2. 27Al 3QMAS NMR spectra for permanently densified pyrope glasses at 1 atm and 12.2 GPa (615 ton). The current spectra confirm the presence of distinct Al coordination environments. The spectra in Fig. 3 allow us to estimate the quantitative fractions of Al species.$ 그림 Fig. 2. ²⁷Al 3QMAS NMR spectra for permanently densified pyrope glasses at 1 atm and 12.2 GPa (615 ton). The current spectra confirm the presence of distinct Al coordination environments. The spectra in Fig. 3 allow us to estimate the quantitative fractions of Al species.
그림 Fig. 3. Total isotropic projection of ²⁷Al 3QMAS NMR spectra for permanently densified pyrope glasses with increasing oil tonnage up to 615 ton. The thick lines show the experimental spectra. The thin black lines represent the results of fitting with multiple Gaussian functions accounting for ^[n]Al species: grey, red, blue envelopes for ^[4]Al, ^[5]Al, and ^[6]Al, respectively.
$Table 1. Fraction of the [5,6]Al in the pyrope glasses upon cold compression up to ~615 ton. Pressure conditions estimated from the fraction of the [5,6]Al (see Eq. 1) are also shown.$ 표 Table 1. Fraction of the ^[5,6]Al in the pyrope glasses upon cold compression up to ~615 ton. Pressure conditions estimated from the fraction of the ^[5,6]Al (see Eq. 1) are also shown.
그림 Fig. 4. Normalized ^[4,5,6]Al proportion X^{[4,5 6]}Al(p) for permanently densified pyrope glasses with increasing pressures.
$Fig. 5. Pressure-load calibration curves for 14/8 HT assembly at room temperature, established from the fraction of [5,6]Al in permanently densified pyrope glasses. Calibration curves for 14/8 HT assemblies at 1,200℃ are shown for comparison (Mosenfelder et al., 2006; Leinenweber et al., 2012; Kim and Lee, 2018).$ 그림 Fig. 5. Pressure-load calibration curves for 14/8 HT assembly at room temperature, established from the fraction of ^[5,6]Al in permanently densified pyrope glasses. Calibration curves for 14/8 HT assemblies at 1,200℃ are shown for comparison (Mosenfelder et al., 2006; Leinenweber et al., 2012; Kim and Lee, 2018).

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