[논문]전주 남부지역 쥬라기 화강암질 저반체의 지열사와 융기사: 피션트랙 열연대학적 해석

신성천

doi:10.9719/eeg.2016.49.5.389

전주 남부지역 쥬라기 화강암질 저반체의 지열사와 융기사: 피션트랙 열연대학적 해석
Thermal and Uplift Histories of the Jurassic Granite Batholith in Southern Jeonju: Fission-track Thermochronological Analyses 원문보기

자원환경지질 = Economic and environmental geology, v.49 no.5, 2016년, pp.389 - 410

초록
AI-Helper

옥천대 남서부인 전주-김제-정읍일대 쥬라기 화강암질 저반체로부터 구한 FT 연대는 넓은 범위에 걸쳐 나타난다: 스핀=158~70 Ma; 저콘=127~71 Ma; 인회석=72~46 Ma. 교란되지 않은 일차냉각 및 리셋 또는 부분감소된 FT 연대, 그리고 일부 트랙 길이 측정자료에 기반한 열연대학적 해석을 통해 화강암체가 겪은 복잡한 지열사를 규명하였다. 이 화강암체의 전체 냉각사는 정출 후 $300^{\circ}C$ 등온선까지의 비교적 빠른 전기 냉각(${\sim}20^{\circ}C/Ma$)과 $300^{\circ}C-200^{\circ}C-100^{\circ}C$ 등온선을 거쳐 현재 지표온도에 이르기까지의 매우 느린 후기 냉각($2.0{\sim}1.5^{\circ}C/Ma$)으로 특징지어진다. 이 쥬라기 화강암체의 많은 부분은 일련의 후기 백악기 화성활동에 의해 적어도 $170^{\circ}C$ 이상(최고 >$330^{\circ}C$)의 다양한 수준에 달하는 지열상승을 겪은 것으로 확인되었다. 다양한 후기 화성암체들의 두 지점으로부터 중복측정된 FT 저콘 연대의 일치된 결과는 그들의 생성시기를 잘 정의한다: 석영반암=$73{\pm}3Ma$; 섬록암=$73{\pm}2Ma$; 유문암=$72{\pm}3Ma$; 장석반암=$78{\pm}4Ma$ (전체 가중평균=$73{\pm}3Ma$). 이들 후기 화성암체와 페그마타이트 암맥군의 관입은 온천개발지역(화심, 죽림, 목욕리, 회봉 등)을 위시한 연구지역 내에서의 후기 지열상승에 주요 역할을 하였던 것으로 해석된다. 이 화강암 저반체의 후기냉각이 지표면의 침식-삭박에 따른 상대적 융기에 의해 근본적으로 규제되었다고 가정하면, 전기 백악기 이후의 융기는 연간 평균 약 0.05 mm (즉 백만 년에 약 50 m)의 매우 느린 속도로 진행되었다. 100 Ma, 70 Ma, 40 Ma를 기준으로 현재까지의 총융기량은 각각 5 km, 3.5 km, 2 km 정도로 추정된다. 여러 지점의 일정한 융기량은 암체 전체가 광역적으로 고르게 융기하였음을 지시한다.

Abstract ▼ AI-Helper

Wide ranges of fission-track (FT) ages were obtained from the Jurassic granite batholith in Jeonju-Gimje-Jeongeup area, southwestern Okcheon Belt: sphene=158~70 Ma; zircon=127~71 Ma; apatite=72~46 Ma. Thermochronological analyses based on undisturbed primary cooling and reset or partially-reduced FT ages, and some track-length data reveal complicated thermal histories of the granite. The overall cooling of the batholith is characterized by a relatively rapid earlier-cooling (${\sim}20^{\circ}/Ma$) to $300^{\circ}C$ isotherm since its crystallization and a very slow later-cooling ($2.0{\sim}1.5^{\circ}/Ma$) through the $300^{\circ}C-200^{\circ}C-100^{\circ}C$ isotherms to the present surface temperature. It is indicated that the large part of Jurassic granitic body experienced different level of elevated temperatures at least above $170^{\circ}C$ (maximum>$330^{\circ}C$) by a series of igneous activities in late Cretaceous. Consistent FT zircon ages from duplicate measurements for two sites of later igneous bodies define their formation ages: e.g., quartz porphyry=$73{\pm}3Ma$; diorite=$73{\pm}2Ma$; rhyolite=$72{\pm}3Ma$; feldspar porphyry=$78{\pm}4Ma$ (total weighted average=$73{\pm}3Ma$). Intrusions of these later igneous bodies and pegmatitic dyke swarms might play important roles in later thermal rise over the study area including hot-spring districts (e.g., Hwasim, Jukrim, Mogyokri, Hoebong etc.). On the basis of an assumption that the latercooling of granite batholith was essentially controlled by the denudation of overlying crust, the uplift since early Cretaceous was very slow with a mean rate of ~0.05 mm/year (i.e., ~50 m/Ma). Estimates of total uplifts since 100 Ma, 70 Ma and 40 Ma to present-day are ~5 km, ~3.5 km and ~2 km, respectively. The consistent values of total uplifts from different locations may suggest a regional plateau uplift with a uniform rate over the whole granitic body.

주제어

질의응답

핵심어	질문	논문에서 추출한 답변
	U-Pb 연대 측정법은 무엇을 이용한 방법인가?	2000년대에 들어와서부터는 주로 저콘 또는 스핀을 이용한 U-Pb 연대 측정법에 기반하여 옥천대 중부에서 남서부에 이르는 광범위한 지역에 분포하는 다양한 암상의 쥬라기 화강암질암에 대한 연대 측정연구들이 활발하게 수행돼왔다(Table 1). 특히 전주-김제-정읍 일대의 전주전단대와 그 주변에 산출되는 거대한 저반상 화강암복합체에 대해서는 다양한 암상별로 관입 시기의 정의가 잘 이루어졌다(Lee et al.
	한반도 남서부에 존재하는 연성전단대는?	한반도 남서부에는 가장 규모가 큰 진안-오수-순창-강진을 잇는 순창전단대를 위시하여, 전주-무안-목포 간의 전주전단대, 장성-무안 간의 광주전단대, 영광 부근에서 전주전단대로부터 갈라진 영광전단대 등 여러 조의 연성전단대(延性剪斷帶, ductile shear zone)가 존재한다. Yanai et al.
	호남전단대의 화강암질암은 어떻게 해석되는가?	(1985)이 옥천대 남서부의 넓은 지역에 발달돼있는 여러 조의 전단대를 호남전단대라 처음 명명하고 구조지질학적 특징에 관해 보고한 이래, 전단대의 성인과 형성시기 규명은 한반도를 포함한 동아시아의 지구조 진화를 이해하기 위한 주요 연구주제로 부각돼왔다. 특히 전단대에 분포하는 유색광물의 엽리조직을 뚜렷하게 보이는 화강암질암은 연성변형작용을 받은 압쇄암으로 해석됨으로써(Lee et al., 1990, 2001; Kim et al.

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저장형식	Text(ASCII format) Excel format RefWorks Direct Export RIS format (for Reference Manager, ProCite, EndNote), Scholar's Aids, Mendeley
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
안내	총 건의 자료가 검색되었습니다. 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오. ~ Text(ASCII format) Excel format

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