http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 정증효 (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
지리산 지역 편마암류의 암석화 및 동위원소연대에 대한 연구 : 1. 산청 지역에 분포하는 정편마암류의 암석학 및 암석화학적 연구
이상원,정증효,이춘희,이영택 부산대학교 사범대학 1999 교사교육연구 Vol.37 No.-
Precambrian metamorphic rocks in the studied area, eastern part of Jiri mountain, are divided into paragneiss and orthogneiss. The paragneiss is composed of metapelites, small amount of meta-psammitic and calc-silicate rocks. The orthogneiss is classified into massive granitic gneiss(MGGN), porphyorblastic gneiss (PBGN), biotite-hornblende gneiss (BHGN), biotite gneiss (BTGN), leucocratic granite gneiss (LGGN), granoblastite(GRNB), hornblende gneiss (HBGN), meta-anorthositic rocks (ANR) and meta-charnockitic rocks (CHR). Petrochemically, exception of ANR and HBGN, compositions of orthogneiss belong to the range from tonalite to granite. Especially ANR and HBGN are similar in major element compositoin, but HBGN is slightly depleted in trace and rare earth elements. In primitive mantle-normalized REE patterns, they represent enriched pattern in the order of HBGN, ANR, CHR and granitic gneisses and Eu anomaly of HBGN is stronger positively than those of ANR and CHR, otherwise those of granitic gneisses are negative. We considered orthogneisses are originated from fractional crystallization of co-magma and the composition of parental magma is similar to that of HBGN. Although CHR is metamorphosed retrogressively as orthopyroxene replaced to amphiboles, it has euhedral microcline phenocrysts and massive texture without foliation except but mylonitized zone. So it is concluded that CHR was crystallized from anhydrous granitic magma at high temperature. If these orthogneisses were products of fractional crystallization of co-magma, it is considered that the parent would be dioritic to jotunitic magma as AMCG complex of Hidra massif in Rogaland, SW Norway. The gneisses occurred in the region of Jiri mountain are retrogressively metamorphosed at least three times from granulite facies to amphibolite or epidote-amphibolite facies (partly to greenschist facies). The record of the granulite facies as the first metamorphism is retained only in metapelites with mineral assembage of biotite-garnet-cordierite-sillimanite-K feldspar-plagioclase-quartz, but the orthogneiss exhibits the record of later metamorphism represented amphibolite and epidote-amphibolite facies. The episode of the first metamorphism is considered as any time before emplacement of MGGN (2,100Ma) and PBGN (1,900Ma), which have no record of the first metamorphism. The second metamorphism was occurred after intrusion of parent of PBGN but before intrusion of ANR (1,700Ma). The episode of third metamorphism is any age after intrusion of anorthositic rocks.
-
이상원,이춘희,정증효 釜山大學校 師範大學 1996 교사교육연구 Vol.33 No.-
Palgongsan granite considered to be a rapid cooling shallow-level intrusion, exhibits textural and mineralogical changes from margin toward core. In petrochemistry it is characteristic of I-type granitoid representing calc-alkaline differentiation trend, which is discriminated active continental arc granitoid in tectonomagmatic environment. In Q-Ab-Or-An system norm compositions of the Palgongsan granite are plotted near low-temperature trough, and concentrated on the minimum melt curve (700℃). Palgongsan granite intruded and metamorphosed sedimentary rocks to hornfelses forming contact metamorphic aureoles (average 1.5 km width). Contact aureoles are divided into inner and outer zone, which are respectively biotite and chlorite zone, indicating albite-epidote hornfels facies. The mineral assemblages are chlorite-muscovite in chlorite zone and biotite-muscovite(-chlorite), epidote-chlorite, actinolite-chlorite and actinolite -epidote-chlorite in biotite zone. Metamorphic temperature is as low as to be estimated about 350℃ in chlorite zone and 400℃ or higher in biotite zone.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
