인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
Abstract The largest Ediacaran carbon isotope excursion (the Shuram excursion, SE) has been proposed to coincide with a transient oceanic oxygenation event. However, the mechanisms responsible for the SE and the associated oxygenation remain unclear. In this study, we investigated the role of silicate weathering during the SE by measuring Li isotope compositions from two suites of marine carbonates in the Ediacaran Doushantuo sections. Our results reveal a pronounced negative lithium isotope excursion during the SE, which cannot be attributed to mineralogical effects and argues against a diagenetic origin for the SE. Instead, box model simulations of lithium-strontium cycles suggest a pulsed phase of enhanced congruent continental weathering during the SE. This increased weathering would have significantly elevated the input of essential nutrients into the ocean, boosting primary production, which in turn led to transient oceanic oxygenation. This process may also explain the negative δ 13 C carb excursion, as it could result from the oxidation of upwelling dissolved organic carbon in shallow seawater. Continental weathering likely played a crucial role in regulating climate, seawater chemistry, and Earth’s surface oxidation state during the SE.
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.