Uijongbu circular structure of Seoul granitic batholith, Korea: Ring dike origin of a Jurassic volcanic cauldron

Sung Tack Kwon, Hee Sagong

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We report a ring dike of Jurassic granite for the first time in Korea. There is a prominent circular structure in Seoul granitic batholith near Uijongbu, north of Seoul. The circular structure consists of large eastern half-circle (ca. 13 km in diameter) and small western half-circle (ca. 6 km in diameter) divided by a north-south-striking fault. A comparison with recently available geologic maps indicates that the geologic structure corresponds to a ring dike (or cone sheet) of garnet biotite granite, which negates an impact origin. We suggest that the Uijongbu structure was formed by differential weathering between resistant garnet biotite granite and easily weathered biotite granite. A ring dike origin for the Uijongbu structure probably associated with a volcanic cauldron subsidence is supported by rather shallow emplacement depth for the Jurassic granite and fast cooling rate (ca. 100°C/Ma) estimated from mineral ages, although no associated volcanics are present in the surrounding region.

Original languageEnglish
Pages (from-to)161-164
Number of pages4
JournalGeosciences Journal
Volume2
Issue number4
DOIs
Publication statusPublished - 1998

Bibliographical note

Funding Information:
ACKNOWLEDGMENTS: This study was supported by Korea Science and Engineering Foundation grant (97-07-03-01-01-3) and in part by Center for Mineral Resources, We are grateful to H.S. Jung for providing the Landsat image of the study area, and to J.-H. Ree and an anonymous reviewer for their constructive comments.

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Fingerprint Dive into the research topics of 'Uijongbu circular structure of Seoul granitic batholith, Korea: Ring dike origin of a Jurassic volcanic cauldron'. Together they form a unique fingerprint.

Cite this