Journal of the Geological Society of Korea (지질학회지)

The Geological Society of Korea (대한지질학회)
권호 표지

Cretaceous and Tertiary paleostress from healed microcracks and fluid inclusions of granites in Masan and Yangsan areas

마산 및 양산 일대의 백악기 화강암류의 아문 미세균열과 유체포유물 연구를 통한 백악기 및 신생대 고응력장 분석

Jang, Bo-An;Jeong, Hae-Sik
장보안;정해식

  • Published : 20050300

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Abstract

Paleostress field during the late Cretaceous to early Tertiary in the Gyeongsang Basin was interpreted from the healed microcracks and the secondary fluid inclusions of the Cretaceous Bulgugsa granites in Masan, Jinhae, Gupo and Yangsan areas. The preferred orientations of healed microcracks in the Masan and Jinhae granites are WNW and show NE in the Gupo and Yangsan granites. It was also estimated that the healed microcracks in Masan, Jinhae, Kupo and Yangsan granites were formed during 87～78 Ma, 64～62 Ma, 62～59 Ma and 64～59 Ma, respectively, which were determined by correlating its cooling histories and trapping temperature of fluid inclusions. These results indicate that the maximum horizontal paleostress in the Gyeongsang Basin was WNW direction in the late Cretaceous and might be rotated to NE direction rapidly in about 62 Ma.

마산, 진해, 구포 및 양산 일대의 경상분지 남동부에 광범위하게 분포하고 있는 불국사관입암군에 내재된 아문 미세균열 및 유체포유물을 이용하여 백악기 말에서 신생대 제3기 초에 경상분지에 작용한 고응력장을 해석하였다. 마산 및 진해 지역에 분포하는 화강암내의 아문 미세균열은 서북서 방향이 우세한 반면에 구포 및 양산 지역 화강암의 아문 미세균열은 북동 방향이 우세하다. 또한 각 화강암체의 냉각사와 유체포유물에서 측정된 온도를 비교한 결과 아문 미세균열의 생성온도는 마산, 진해, 구포 및 양산화강암에서 각각 87～78 Ma, 64～62 Ma, 62～59 Ma 및 64～59 Ma로 평가되었다. 이들 결과를 종합하여 고응력장을 복원하면 경상분지에는 백악기 말에 서북서 방향의 최대 수평 주응력이 작용하였으며 신생대 제3기 초에 이르러 북동방향으로 회전하였고, 그 시기는 약 62 Ma로 추정된다.

Keywords

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