Conference Abstracts
- 제목(Title): [학회년도 학회약어] 초록 제목
- 내용(Contents):
- 제목: [2022 AGU] Effects of Sediment Flux into the Yellow Sea on Basin Formation
- 내용:
2024-07-08 23
제목(Title): Preliminary study of spatiotemporal variability of sandstone compositions for early Paleozoic sandstones in the Bowers Terrane, northern Victoria Land, Antarctica
- 저자(Authors): Hongwoo Kim, Jusun Woo
- 공식학회명(Conference Name): The 37th International Geological Congress 2024
- 개최국/장소(Country/Location): 한국/부산
- 발표일자(Presentation Date): 2024/08/29
- 발표타입(Presentation Type): 포스터
- 초록(Abstract): The Bowers Terrane, located in northern Victoria Land, Antarctica, is represented by early Paleozoic sedimentary rocks, the Bowers Supergroup which consists of the Sledgers, the Mariner, and the Leap Year groups in ascending order. These successions record the depositional history of the eastern Gondwana margin in the early Paleozoic and serve as a significant puzzle piece in interpreting tectonic events in the Gondwana and surrounding landmasses. In this study, we analyzed the sandstone composition of the Bowers Supergroup using point-counting methods to visualize spatiotemporal variability on the QFL triangular diagrams. The Molar Formation (Sledgers Group) at Reilly Ridge, consistent with previous studies, shows a transitional continental to recycled orogenic composition. The Spurs Formation (Mariner Group) at Reilly Ridge and Eureka Spurs has a recycled orogenic to transitional arc composition. This is similar to the known composition of the Molar Formation, which means the source area didn’t change dramatically. However, in Eureka Spurs, south of Reilly Ridge, a more mature composition is observed and leading up to Eureka Formation (Mariner Group). The South End Member (Mariner Group) overlying the Spurs Formation at Reilly Ridge represents recycled orogenic composition with higher matureness than the Spurs Formation at Reilly Ridge, but lower than the Spurs Formation at Eureka Spurs. The sandstone clast composition of this member interestingly resembles the sandstone clast of the Carryer Conglomerate (northern Victoria Land) and Lockett/Dead Goat Conglomerate (New Zealand), but differs from the sandstone clasts of the Douglas Conglomerate (central Transantarctic Mountains), all of which were considered to be located in the eastern margin of Gondwana during the early Paleozoic. The Reilly Conglomerate (Leap Year Group) at Reilly Ridge shows a recycled orogenic composition. Camp Ridge Quartzite (Leap Year Group) represents craton interior composition at Leitch Massif and recycled orogenic at Eureka Spurs. Considering good sorting and roundness of Camp Ridge Quartzite at Leitch Massif, the composition is thought that the influence of depositional mechanism played a significant role, such as differential reworking, rather than changes in the source province. Spatiotemporal variability of sandstone clast composition could provide a better understanding of the source area of the sandstone and deposition processes in the Bowers Terrane.