A review of temporal constraints for the Palaeoproterozoic large, positive carbonate carbon isotope excursion (the Lomagundi-Jatuli Event)
A review of temporal constraints for the Palaeoproterozoic large, positive carbonate carbon isotope excursion (the Lomagundi-Jatuli Event)
复制标题
古元古代大型正碳同位素偏移（Lomagundi-Jatuli 事件）的时间限制综述
DOI：
10.1016/j.earscirev.2013.10.006
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发表时间：
2013
影响因子：
12.1
通讯作者：
Martin A
中科院分区：
文献类型：
--
作者：
Martin A
古元古代Lomagundi-Jatuli事件是已知最大规模和最早的正碳酸盐碳同位素漂移事件之一，δ 13 C值保持在+ 5和+ 16‰之间，甚至更高。它记录在除南极洲以外所有大陆的沉积岩中，地层厚度从几米到几十米不等。这个独特的正δ 13 C间隔标志着全球碳循环的根本变化，是地球大气氧化后地球系统演化的关键事件。在这里，我们提出了一个全面的审查年龄限制的Lomagundi-Jatuli事件，第一次这样的努力在二十年。这一新的年表汇编的重点是U-Pb和Re-Os计时器，并表明全球同步的Lomagundi-Jatuli事件是允许的，一个解释支持的明显广泛分散的Lomagundi-Jatuli事件轴承继承在最近的古元古代板块重建。假设Lomagundi-Jatuli事件在全球范围内是同步的，那么其持续时间的范围从最大值249 ± 9百万年（2306 ± 9 Ma到2057 ± 1 Ma）到最小值128 ± 9.4百万年（2221 ± 5 Ma到2106 ± 8 Ma）。
The Palaeoproterozoic Lomagundi–Jatuli Event is one of the largest magnitude and earliest known positive carbonate carbon isotope excursions, preserving δ13C values between + 5 and + 16‰ and even higher. It is recorded in sedimentary rocks on all continents bar Antarctica and spans stratigraphic thicknesses ranging from several to many tens of metres. This unique positive δ13C interval signals fundamental changes in the global carbon cycle and is a key event in Earth system evolution following oxygenation of Earth's atmosphere. Here we present a comprehensive review of the age constraints on the Lomagundi–Jatuli Event, the first such effort in two decades. This new chronology compilation focuses on the U–Pb and Re–Os chronometers and demonstrates that global synchronicity of the Lomagundi–Jatuli Event is permissible, an interpretation supported by the apparent wide dispersion of Lomagundi–Jatuli Event-bearing successions in the most recent Palaeoproterozoic plate reconstructions. Assuming the Lomagundi–Jatuli Event is synchronous worldwide, then the bounds on its duration range from a maximum of 249 ± 9 Myr (2306 ± 9 Ma to 2057 ± 1 Ma) to a minimum of 128 ± 9.4 Myr (2221 ± 5 Ma to 2106 ± 8 Ma).