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미국 리오 그란데 리프트 페리도타이트 포획암의 미구조와 유체포유물에 기록된 상부맨틀의 불균질성
박문재 한국광물학회 2022 광물과 암석 (J.Miner.Soc.Korea) Vol.35 No.3
Mantle heterogeneity is closely related to the distribution and circulation of volatile components in the Earth’s interior, and the behavior of volatiles in the mantle strongly influences the rheological properties of silicate rocks. In mantle xenoliths, these physicochemical properties of the upper mantle can be recorded in the form of microstructures and fluid inclusions. In this paper, I summarized and reviewed the results of previous studies related to the characteristics of microstructures and fluid inclusions from peridotite xenoliths beneath the Rio Grande Rift (RGR) in order to understand the evolution and heterogeneity of upper mantle. In the RGR, the mantle peridotites are mainly reported in the rift axis (EB: Elephant Butte, KB: Kilbourne Hole) and rift flank (AD: Adam’s Diggings) regions. In the case of the former (EB and KB peridotites), the type-A lattice preferred orientation (LPO), formed under low-stress and low-water content, was reported. In the case of the latter (AD peridotites), the type-C LPO, formed under low-stress and high-water content, was reported. In particular, in the case of AD peridotites, at least two fluid infiltration events, such as early (type 1: CO2-N2) and late (type-2: CO2-H2O), have been recorded in orthopyroxene. The upper mantle heterogeneity recorded by these microstructures and fluid inclusions is considered to be due to the interaction between the North American plate and the Farallon plate.
박문재,최윤수,김재명,안종욱 한국지적학회 2019 한국지적학회지 Vol.35 No.3
The purpose of this study is to analyze the problems of the cadastral reinvestigation, and offer resolutions related to the construction of cadastral map in relation with the administrative boundaries project. First, most the excluded lands designated as 2007 cadastral reinvestigation have disparity between cadastral records from the actual land uses. World geodetic system conversions were undertaken for the excluded lands despite having been excluded from cadastral reinvestigation. As a result, world geodetic system conversions has to be taken undertaken once again, leading to wasted administrative resources. It is necessary to perform a full-scale research on the excluded lands and include the lands needed boundary revise on cadastral reinvestigation project. Second, cadastral research procedure has been divided into areas for cadastral reconsideration and areas for world geodetic boundary conversion areas. As a result, even after cadastral reinvestigation has been completed, problems remain for non-coinciding administrative boundaries. Therefore, it is necessary to perform cadastral reinvestigation at block level, such as roads, rivers, administrative townships (dong) etc. Third, the continuous cadastral map, which is used as the foundation for creating topographical drawings and spatial information, is built on the cadastral map which contains errors during computerization process. Therefore, it is deemed necessary to improve the quality of continuous cadastral maps in order to solve the problems of overlap and separation and utiilize the achievements of world geodetic conversion for building digital spatial information. 본 연구는 지적재조사사업 추진에 따른 제반 문제점을 분석하고, 지적도면 경계정비사업과 연계하여 디지털지적 구축과 관련된 문제들을 해결할 수 있는 방안을 모색하여 제시하고자 하였다. 첫째, 2007년도 지적재조사사업 대상지 조사시 대부분 제외된 도면 경계정비 대상 토지의 경우 지적과 현황이 일치하지 아니 함에도 불구하고 지적재조사사업 대상에 제외된 상태로 세계측지계 변환을 실시함으로써 추후 세계측지계 변환을 재실시해야 하는 등 행정적 낭비 요소가 내재하고 있다. 지적재조사사업 대상지에 대한 전면 재조사를 실시하여 도면 경계정비 대상지를 지적재조사 사업대상지로 포함하여야 할 것으로 사료된다. 둘째, 지적재조사 대상지역과 세계측지계 변환 대상지역으로 이분화 되어 있는 지적재조사사업 추진체계로 인해 재조사사업이 완료된 이후에도 행정구역간‧도곽간 접합오류가 해소되지 못하는 문제를 해결하기 위해 도로, 하천, 행정동 등 블록단위의 전면적 지적재조사 실시가 필요할 것으로 판단된다. 셋째, 지형도면 작성‧고시 및 공간정보 기초자료로 활용되고 있는 연속지적도는 도면전산화 과정에서 오류가 내포된 지적도를 기반으로 구축된 것으로, 지적도면의 도곽‧축척‧행정구역간 겹침 및 이격 등의 문제를 해결하고 세계측지계 변환 성과를 디지털 공간정보 구축에 이‧활용하기 위해 연속지적도 품질개선사업 추진이 절실히 필요한 것으로 판단된다.
박문재,정해명 한국지질과학협의회 2020 Geosciences Journal Vol.24 No.6
Automated electron backscattered diffraction (EBSD) data yield abundant information on the lattice-preferred orientations (LPOs) and deformation microstructures and mechanisms of minerals in a rock, which aid in our understanding of the tectonic conditions and history of a region. Additionally, this information allows us to interpret seismic anisotropies in the crust and mantle. However, great care must be taken in the collection and production of crystallographic orientation data via automated EBSD to more precisely interpret LPOs, deformation microstructures, and seismic anisotropies because petro-fabrics can be different depending on sampling methods such as all-points-per-grain (whole) data and one-point-per-grain (one orientation per grain) data. Here, we report a detailed comparison of the crystallographic orientation data produced using both all-points-per-grain and one-point-per-grain techniques to analyze eclogites from the Yuka terrane in the North Qaidam ultrahigh-pressure metamorphic belt of northwestern China. By comparing eclogite crystallographic orientations between different sampling methods, we found that there was no marked difference in the LPOs, fabric strengths (J-index and M-index), and seismic anisotropies for relatively small mineral grains (e.g., garnet and omphacite). However, there were large differences in the LPOs, fabric strengths, and seismic anisotropies of relatively large minerals grains (e.g., amphibole). This result can be attributed to the acquisition method of crystallographic orientation data, which can influence the LPO, fabric strength, and seismic anisotropy of minerals and rocks. Therefore, the pole figures of minerals should be constructed from one point per grain data in order to avoid the oversampling of large grains for samples with highly heterogenous grain size distributions, as well as to permit the comparison of crystallographic orientations obtained using different tools and in other studies.