干旱区生态环境知识资源中心(Arid): Sequestration of carbon as carbonate in the critical zone: insights from the Himalayas and Tibetan Plateau

Arid

	Sequestration of carbon as carbonate in the critical zone: insights from the Himalayas and Tibetan Plateau
	Galy Albert; Yang Yibo; Fang Xiaomin
来源期刊	Acta Geochimica
ISSN	2096-0956
出版年	2017
卷号	36 期号:3 页码:389-391
英文摘要	The carbon pool stored in soil carbonate is comparable to the soil organic carbon. Therefore, secondary calcite precipitation in supersaturated catchment could be an important, yet poorly constrained, carbon sink within the modern global carbon cycle. The chemical analysis of some dissolved species transported by rivers, such as elevated Sr/Ca and Mg/Ca ratios but also heavy stable Ca isotopic compositions, witness the formation of secondary calcite in rivers draining arid regions. However, in areas affected by active tectonics and rapid physical erosion, co-variations in the fluvial Sr/Ca and Mg/Ca ratios could also be related to incongruent carbonate weathering processes. Here, we present a model to assess the roles played by incongruent carbonate dissolution and secondary calcite precipitation in modern weathering processes. We tested and applied the model to rivers draining the Himalayan-Tibetan region. The results suggest that regional aridity in the drainage basin promotes carbon sequestration as secondary carbonate but that for a given runoff, incongruent dissolution of carbonate possibly related to rapid physical erosion amplifies such sequestration. The isotopic compositions (~(13)C/~(12)C and ~(18)O/~(16)O) of detrital carbonate transported by the main rivers in South and South-East Tibet imply that around 1% of the suspended material transported by those rivers corresponds to secondary carbonate and can represent between 5% and 15% of the alkalinity flux. Most of these alkalinity transported as particulate material is, nevertheless related to the weathering of carbonate lithologies and is also subjected to dissolution prior its final storage in sedimentary basins. However, on glacial-interglacial timescale this will amplify the significant role of mountain weathering on climatic variations.
英文关键词	Carbonate Weathering Isotope Tectonic forcing
类型	Article
语种	英语
开放获取类型	Other Gold
收录类别	CSCD
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:6093437
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335862
作者单位	Galy Albert, Centre de Recherches Petrographiques et Geochimiques (CRPG), UMR7358, CNRS,Universite de Lorraine, Vandoeuvre les Nancy, 54500, France.; Yang Yibo, Centre de Recherches Petrographiques et Geochimiques (CRPG), UMR7358, CNRS,Universite de Lorraine, Key Laboratory of Continental Collision and Plateau Uplift, Vandoeuvre les Nancy, 54500, France.; Fang Xiaomin, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Key Laboratory of Continental Collision and Plateau Uplift, Beijing 100085, China.
推荐引用方式 GB/T 7714	Galy Albert,Yang Yibo,Fang Xiaomin. Sequestration of carbon as carbonate in the critical zone: insights from the Himalayas and Tibetan Plateau[J],2017,36(3):389-391.
APA	Galy Albert,Yang Yibo,&Fang Xiaomin.(2017).Sequestration of carbon as carbonate in the critical zone: insights from the Himalayas and Tibetan Plateau.Acta Geochimica,36(3),389-391.
MLA	Galy Albert,et al."Sequestration of carbon as carbonate in the critical zone: insights from the Himalayas and Tibetan Plateau".Acta Geochimica 36.3(2017):389-391.