基于大地电磁资料的东碧亚克地层模型

IF 0.5 Q4 MULTIDISCIPLINARY SCIENCES

Journal of Mathematical and Fundamental Sciences Pub Date : 2020-09-08 DOI:10.5614/j.math.fund.sci.2020.52.2.7

Alviyanda Alviyanda, G. Junursyah, P. Sumintadireja

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引用次数: 0

摘要

Biak岛被认为起源于中生代的澳大利亚大陆被动边缘。这一被动边缘在古近纪经历了构造碰撞，形成了碧亚克岛的基岩。东Biak被石灰岩覆盖，这是了解更深层地层的障碍。本研究的目的是基于岩石电阻率值识别东Biak地区的地下地质。大地电磁(MT)测量是一种被动地球物理方法，能够根据5至10公里深处的岩石电阻率值解释地下地质。东Biak的MT测量使用了25个测量点。利用MT测量产生的岩石电阻率值的横截面变化来识别东Biak地下的岩石类型。确定了五个岩石单元。东Biak地层模式以碳酸盐岩为主，包括两个层序，即厚度为1000 ~ 3000 m的早新近系层序和厚度为180 ~ 2450 m的晚新近系—第四纪层序。这两个层序之间的不整合是由于构造活动造成的，它们将苏比奥里岛与比亚克岛分开。

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Stratigraphic Model of East Biak Based on Magnetotelluric Data

Biak Island is thought to have originated from the Australian Continental passive margin in the Mesozoic. This passive margin underwent tectonic collision to form the bedrock of Biak Island during the Paleogene. East Biak is covered by limestone, which is an obstacle to knowing the deeper stratigraphy. This study’s aim was to identify the subsurface geology of the East Biak area based on rock resistivity values. Magnetotelluric (MT) surveying is a passive geophysical method that is able to interpret subsurface geology based on rock resistivity values at depths of up to 5 to 10 km. The MT measurements in East Biak used 25 measurement points. Cross-sectional variations in rock resistivity values generated from the MT measurements were used to identify rock types in the East Biak subsurface. Five rock units were identified. The East Biak stratigraphy model is dominated by carbonates, comprising two sequences, i.e. an Early Neogene sequence with a thickness of 1,000 to 3,000 m and a Late Neogene to Quaternary sequence with a thickness of 180 to 2,450 m. The unconformity between these two sequences is due to tectonic activity, which separated Supiori and Biak Island.

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来源期刊

Journal of Mathematical and Fundamental Sciences MULTIDISCIPLINARY SCIENCES-

CiteScore

1.30

自引率

0.00%

发文量

审稿时长

24 weeks

期刊介绍： Journal of Mathematical and Fundamental Sciences welcomes full research articles in the area of Mathematics and Natural Sciences from the following subject areas: Astronomy, Chemistry, Earth Sciences (Geodesy, Geology, Geophysics, Oceanography, Meteorology), Life Sciences (Agriculture, Biochemistry, Biology, Health Sciences, Medical Sciences, Pharmacy), Mathematics, Physics, and Statistics. New submissions of mathematics articles starting in January 2020 are required to focus on applied mathematics with real relevance to the field of natural sciences. Authors are invited to submit articles that have not been published previously and are not under consideration elsewhere.