同位素、冰河时代与元古宙末期地球历史。
Isotopes, ice ages, and terminal Proterozoic earth history.
作者信息
Kaufman A J, Knoll A H, Narbonne G M
机构信息
Botanical Museum, Harvard University, Cambridge, MA 02138, USA.
出版信息
Proc Natl Acad Sci U S A. 1997 Jun 24;94(13):6600-5. doi: 10.1073/pnas.94.13.6600.
Abstract
Detailed correlations of ancient glacial deposits, based on temporal records of carbon and strontium isotopes in seawater, indicate four (and perhaps five) discrete ice ages in the terminal Proterozoic Eon. The close and repeated stratigraphic relationship between C-isotopic excursions and glaciogenic rocks suggests that unusually high rates of organic carbon burial facilitated glaciation by reducing atmospheric greenhouse capacity. The emerging framework of time and environmental change contributes to the improved resolution of stratigraphic and evolutionary pattern in the early fossil record of animals.
摘要
基于海水中碳和锶同位素的时间记录，对古代冰川沉积物进行的详细对比表明，元古宙末期有四次（可能还有五次）离散的冰期。碳同位素偏移与冰川成因岩石之间紧密且重复的地层关系表明，异常高的有机碳埋藏速率通过降低大气温室效应促进了冰川作用。新出现的时间和环境变化框架有助于提高动物早期化石记录中地层和演化模式的分辨率。
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