[논문]경기육괴 남서부 유구 지역 금계산에 분포하는 각섬암류 내 각섬석의 격자선호방향

김준하; 정해명

doi:10.22807/kjmp.2022.35.3.259

경기육괴 남서부 유구 지역 금계산에 분포하는 각섬암류 내 각섬석의 격자선호방향
Lattice Preferred Orientation of Amphibole in Amphibole-rich Rocks from Mt. Geumgye, Yugu, Gyeonggi Massif, South Korea 원문보기

광물과 암석 = Korean journal of mineralogy and petrology, v.35 no.3, 2022년, pp.259 - 271

김준하 (서울대학교 지구환경과학부) , 정해명 (서울대학교 지구환경과학부)

초록
AI-Helper

광물의 격자구조가 특정한 방향성을 보이는 격자선호방향은 광물의 변형 조건에 따라 다르기 때문에, 해당 광물과 이를 포함한 암석의 변형 조건을 연구하는데 있어 유용하다. 이번 연구에서는 경기육괴의 남서부지역에 위치한 유구읍 추계리 금계산 일대의 각섬암류를 채취하여 암석내부 각섬석과 장석의 격자선호방향을 후방산란전자회절 기기를 사용하여 분석하였다. 분석결과 유구지역의 각섬석에서는 type IV와 type I 두가지 격자선호방향이 관찰되었다. 유구지역의 각섬암류 내 각섬석은 격자선호방향에 관계없이 강체회전에 의해 변형을 받은것으로 보이며, 암석의 변형정도가 결정입도와 격자선호방향에 영향을 준 것으로 생각된다. 각섬석의 결정입도가 커서 변형을 가장 작게 받은것으로 생각되는 시료에서는 각섬석이 강한 type I 격자선호방향을 보여주었다. 이에 반해, 각섬석의 결정입도가 작아 고변형을 받은 것으로 생각되는 시료들에서는 각섬석이 약한 type IV 격자선호방향을 보여 주었다. 유구지역에서 관찰되는 다양한 암석의 변형정도는 각섬암류와 인접해있는 페리도타이트에서도 관찰된 바 있어, 유구지역이 다양한 수준의 변형을 받았음을 지시한다.

Abstract ▼ AI-Helper

Lattice preferred orientation (LPO), which shows a specific lattice-orientation of minerals, is affected by the deformation conditions of minerals. Because of this reason, LPO is very useful to study the deformation conditions of the minerals and the rocks. In this study, we collected amphibole-rich rocks from the Geumgye Mountain, Chugye-ri, Yugu-eup, Chungcheongnamdo, located in the southwestern part of the Gyeonggi Massif, and analyzed the LPO of amphibole and plagioclase using electron backscattered diffraction. Two types of LPOs of amphibole, type I and type IV, were observed in Yugu amphibole-rich rocks. Our data suggest that the amphibole-rich rocks in Yugu were deformed by rigid body rotation regardless of the LPOs and grain size of amphibole, and the LPOs are considered to have been affected by the degree of deformation (i.e. strain). In the low strained amphibole-rich rock, a strong type I LPO and a large grain size of amphibole were observed. On the other hand, in the highly strained amphibole-rich rocks, a weak type IV LPO and a small grain size of amphibole were observed. The various degree of deformation observed in the Yugu amphibole-rich rocks were also observed in the adjacent peridotites, indicating that the rocks in Yugu experienced various levels of deformation.

주제어

표/그림 (7)

그림 Fig. 1. (a) Simplified tectonic map of Northeast Asia showing location of the study area. (b) Geological map showing the study area, Yugu in southwestern Gyeonggi Massif, Korea (modified after 1:50000 geological map from the Korea institute of Geoscience and Mineral Resources (KIGAM); Um and Lee, 1963). NM (Nangrim Massif), IB (Imjingang Belt), GM (Gyeonggi Massif), TB (Taebaeksan Basin), OB (Okcheon Belt), YM (Yeongnam Massif), and GB (Gyeongsang Basin).
그림 Fig. 2. Sample rock photographs showing a representative amphibolite and hornblendite in the study area. (a) Hand specimen of amphibolite (sample 82). (b) Hand specimen of hornblendite (sample 2667).
그림 Fig. 3. Optical photomicrographs of Yugu amphibole-rich rocks in crossed nicols. (a, b) Amphibolite (sample 82) showing amphibole with small grain size and small aspect ratio. (c, d) Amphibolite (sample 87) showing amphibole with small grain size and relatively large aspect ratio. (e, f) Hornblendite(sample 2666) showing amphibole with bimodal grain size and bimodal aspect ratio. (g, h) Hornblendite (sample 2667) showing amphibole with coarse grain size and large aspect ratio (2667). Red dashed line indicates foliation. Amp: amphibole, Pl: plagioclase, Ep: epidote.
그림 Fig. 4. Pole figures of amphibole and plagioclase plotted in the lower hemisphere using equal area projection. The x direction indicates lineation and z direction indicates the direction normal to foliation. A half-scatter width of 15° was used. Scale bar in the right: m.u.d. (multiples of uniform distribution). N: number of grains. M: M-index. J: J-index.
그림 Fig. 5. GOS distribution of amphibole in Yugu amphibole-rich rocks. (a) Sample 82, (b) Sample 87, (c) Sample 2666, and (d) Sample 2667.
표 Table 1. Sample description and results of Yugu amphibole-rich rocks.
표 Table 2. Chemical compositions of representative amphibole and plagioclase in amphibolites and hornblendites. (Atomic %)

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