The Palaeoproterozoic global carbon cycle: insights from the Loch Maree Group, NW Scotland

The Palaeoproterozoic global carbon cycle: insights from the Loch Maree Group, NW Scotland
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古元古代全球碳循环:苏格兰西北部马里湖群的见解

DOI:
10.1144/jgs2014-042
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发表时间:
2015
影响因子:
2.7
通讯作者:
Kerr G
Kerr G
中科院分区:
地球科学2区
文献类型:
--
作者:
Kerr G

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地球科学家对古元古代的两个事件特别感兴趣。它们是全球Lomagundi-Jatuli事件,地球历史上最大的正碳酸盐碳同位素漂移,以及世界上最大的有机碳埋藏事件Shunga事件。分析新获得的高分辨率碳氧同位素数据和锆石U-Pb年代学,完善了对苏格兰西北部古元古代洛赫马里群的碳同位素特征和沉积时间的理解。岩相学检查揭示了洛赫马里群和基性岩基底之间的基底不整合,从而可以确定地层学和地质学方向。不整合面正上方的碎屑锆石年龄为atc。2.3佐治亚州两个时间离散的碳酸盐包的δ 13 C碳酸盐数据范围为c。+15至2‰,在旧单位和c。在较年轻的碳酸盐岩单元中为2--5 ‰。目前的年龄限制表明,洛赫马里组是太年轻,完全coeval与Lomagundi-Jatuli事件,但在Shunga事件的年龄范围内。这恢复考虑一个简单的质量平衡过程,包括埋葬的有机碳作为至少有一些解释的C-循环扰动的Palaeoprozoictime.Supplementary MaterialSample的描述从洛赫Maree组,地球化学数据,样品制备和地质年代学数据可在http://www.geolsoc.org.uk/SUP18865。
Two Palaeoproterozoic events have particularly interested Earth scientists. These are the global Lomagundi–Jatuli Event, the greatest magnitude positive carbonate carbon isotope excursion in Earth history, and the Shunga Event, the world’s largest organic carbon burial event. Analysis of newly acquired high-resolution C–O isotope data and U–Pb zircon geochronology refine understanding of carbon isotope characteristics and timing of deposition of the Palaeoproterozoic Loch Maree Group of NW Scotland. Petrographic examination reveals a basal unconformity between the Loch Maree Group and Archaean basement, permitting a stratigraphy and younging direction to be assigned. Detrital zircon ages from immediately above the unconformity are dated atc. 2.3 Ga. δ13Ccarbonatedata on two temporally discrete carbonate packages range fromc. +15 to 2‰ in the older unit andc. 2 to −5‰ in the younger carbonate unit. Current age constraints indicate that the Loch Maree Group is too young to be fully coeval with the Lomagundi–Jatuli Event but is within the age range of the Shunga Event. This revives consideration of a straightforward mass-balance process involving burial of organic carbon as an explanation for at least some of the C-cycle perturbations of Palaeoproterozoic time.Supplementary MaterialSample descriptions from the Loch Maree Group, geochemical data, sample preparation and geochronology data are available at http://www.geolsoc.org.uk/SUP18865.
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