The Carbon Sink in the Mesoproterozoic Ocean and Its Implications for Marine Carbon Storage Pathways
中元古代海洋における炭素吸収源とその海洋炭素貯蔵経路への示唆 (AI 翻訳)
Chaokun Zhang, Wei Tian, Yanxin HE
🤖 gxceed AI 要約
日本語
本研究は、中国北部の中元古代Xiamaling層における方解石団塊の成長メカニズムと炭素吸収源としての重要性を、岩石学的・地球化学的証拠に基づいて解明した。推定された炭素固定量は70.24 Gt C（257.56 Gt CO2）に達し、微生物媒介性炭酸塩沈殿が海洋堆積物中の効果的な炭素固定メカニズムであることを示す。この知見は、海底炭素貯留戦略、特に生触媒や塩水を用いたCO2鉱物トラップの工業的促進に示唆を与える。
English
This study investigates calcite concretions in the Mesoproterozoic Xiamaling Formation using petrographic and geochemical evidence. It estimates that the concretion-bearing interval sequestered 70.24 Gt C (257.56 Gt CO2), highlighting microbially mediated carbonate precipitation as an effective carbon immobilization mechanism. The findings offer potential implications for developing subseafloor carbon storage strategies, especially using biocatalysts or brine to accelerate CO2 mineral trapping.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本はCCSの推進を掲げており、海底地層へのCO2貯留技術の開発が進んでいる。本論文は、自然の海洋炭素固定プロセス（微生物媒介性炭酸塩沈殿）のメカニズムを解明し、工学的CCSへの応用可能性を示唆する点で、日本のCCS研究や北海道・東北沖での実証実験などに関連する基礎知見を提供する。ただし、直接的な日本データは含まれていない。
In the global GX context
Globally, CCS is recognized as a key mitigation technology, with subseafloor storage being a major pathway. This paper provides a natural analogue for microbially induced carbonate precipitation, which could inform efforts to enhance mineral trapping of CO2 in marine sediments. The findings are relevant for CCS scale-up strategies and for understanding long-term carbon storage stability, but the study is based on ancient geological data rather than current operational systems.
👥 読者別の含意
🔬研究者:Provides quantitative evidence for natural carbon sequestration rates and mechanisms in marine sediments, useful for CCS analogue studies and carbon cycle modeling.
🏛政策担当者:Highlights the potential of microbially enhanced mineral trapping for long-term CO2 storage, informing R&D priorities in CCS policy.
📄 Abstract（原文）
Anthropogenic CO2 emissions have perturbed the global carbon cycle and increased atmospheric carbon concentrations to critical levels, making carbon capture and storage (CCS) a key strategy for mitigating climate warming. Natural carbon sequestration has operated continuously in marine environments throughout Earth history. Here, we investigate the growth mechanisms and carbon-sink significance of calcite concretions in the Mesoproterozoic Xiamaling Formation from the Zhaojiashan section and the Zhenzhuquan section in the North China Craton, using petrographic, elemental geochemical and C-O-Re-Os isotopic evidence. The presence of erosional surfaces and local truncation of host-rock laminae suggests that these concretions formed synsedimentarily or during early diagenesis near the sediment-water interface. The δ13C values (−5.05‰ to 1.54‰) of samples, together with δ18O-δ13C relationships, indicate a marine carbonate affinity and suggest that dissolved inorganic carbon was the dominant carbon source. In addition, the concretions display initial 187Os/188Os ratios as low as 0.136, close to the mantle Os end-member, implying a contribution from mantle-derived material during concretion formation. The middle rare earth element and yttrium (MREYs)-enriched patterns and slight positive Ce anomalies further indicate that concretion growth occurred mainly within the Mn- and Fe-reduction zones. We estimate that the calcite-concretion-bearing interval of the Xiamaling Formation sequestered 70.24 Gt C, equivalent to 257.56 Gt CO2, serving as an archive of marine carbon burial in the Mesoproterozoic ocean. Microbially mediated carbonate precipitation may represent an effective carbon immobilization mechanism in marine sediments and has potential implications for the development of subseafloor carbon storage strategies, especially where biocatalysts and/or brine could accelerate seawater CO2 mineral trapping to industrially relevant rates.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.3390/su18136851first seen 2026-07-08 05:17:28
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