[논문]호주 남동부 Otway 해안의 후기 신제3기 및 제4기 융기 운동(I): 제4기 해안단구 발달 및 지층서

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doi:10.5467/jkess.2012.33.6.519

호주 남동부 Otway 해안의 후기 신제3기 및 제4기 융기 운동(I): 제4기 해안단구 발달 및 지층서
Late Neogene and Quaternary Vertical Motions in the Otway Coast, Southeast Australia (I): Development and Geochronology of Quaternary Marine Terraces 원문보기

한국지구과학회지 = Journal of the Korean Earth Science Society, v.33 no.6, 2012년, pp.519 - 533

초록
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본 연구는 호주 남동부 Victoria 남부 해안을 따라 발달하고 있는 Otway 산맥 일대에서 지난 5 Ma 동안의 신기지체구조 운동의 성격을 해안 산악 지역을 따라 분포하고 있는 해안단구의 발달상을 통해 밝히고 있다. OSL 연대 측정으로부터 얻은 저위 해안단구면의 융기율은 판 내부 구조운동의 영향이 현생 지형 발달에 미치는 결과를 명확히 보여주고 있다. 또한 본 연구는 제4기 해안단구와 플라이오세 고해수준 기록 간의 층서적 관계를 통해 후기 신제3기 이후에 나타나는 지구조 운동의 변화적 속성을 밝히고 있다. 이와 같은 후기 신제3기 이후 가속화된 지구조 운동 반응은 호주-태평양판의 이동성의 변화와 이에 따른 경계 응력의 증가가 대륙 내부 응력 수준에도 영향을 미친 결과로 이해된다.

Abstract ▼ AI-Helper

This study investigates a neotectonic context of the past 5 Ma for the Otway Ranges along the southern Victoria coast, SE Australia by evaluating the distribution and development of marine terraces along the mountainous coastal area. Uplift rate derived from low terrace deposits using OSL dating method is determined to evaluate the extent to which mild intraplate tectonism has the capability to influence the geomorphic evolution of continental interiors. This study also investigates the stratigraphic relationship between Quaternary marine terraces and Pliocene strandlines, which suggests a change of tectonic activity in the Late Neogene. The intensified tectonic response is well addressed in terms of an increase of the Australian intraplate stress level due to the change of relative motion and increased forces in the boundary between the Australian and Pacific plate.

주제어

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제안 방법

, 2009). In this study geographic distributions and vertical elevations of the marine terraces in the southern coast of the Otway Ranges, SE Australia have been mapped, and quantitative uplift rates have been established using Optically Stimulated Luminescence (OSL) dating method from overlying terrace deposits. The relationship between tectonic uplift and geophysical analysis of gravity anomalies and the in-situ stress fields will be documented in the following paper in order to understand the nature and possible mechanism for the neotectonic movements associated with the Otway Ranges in Southeast Australia.
OSL sensitivity changes in the quartz crystals between the natural and regenerative cycles were monitored after each optical stimulation using test-doses of 1-2 Gy following a 160℃ cut-heat. Preheat tests were carried out on twelve 100 grain aliquots of each sample by holding three aliquots at one of four preheat temperatures (160, 200, 240, 280 1C) for 10 s. The resultant flat plateau indicated no significant thermal transfer in the samples.
8 s and subtracted as background. The OSL data were corrected for any sensitivity changes and dose-response curves constructed using two to six regenerative dose points, depending on the magnitude of the De of the samples. De was obtained from the intercept of the regenerated dose– response curve with the natural luminescence intensity.
The relationship between tectonic uplift and geophysical analysis of gravity anomalies and the in-situ stress fields will be documented in the following paper in order to understand the nature and possible mechanism for the neotectonic movements associated with the Otway Ranges in Southeast Australia.

대상 데이터

APO01 and APO02 were collected from estuarine clay and clayey sand in Apollo Bay (38°45'36''S, 143°39'49''E) (Fig. 6b).
The investigated areas in this study include the southern coast of the Otway Ranges (the Otway coast) extending from Torquay in the east to Port Campbell in the west over a distance of ~160 km (Fig. 1). This coast displays extensively steepened sea bluffs of Tertiary marine and calcareous fluvio-deltaic successions.

이론/모형

De was obtained from the intercept of the regenerated dose– response curve with the natural luminescence intensity. Weighted mean De and their uncertainties were calculated using the central age model of Galbraith et al. (1999).

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