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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Assessment of carbon dioxide sequestration potential of ultramafic rocks in the greenstone belts of southern India
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Assessment of carbon dioxide sequestration potential of ultramafic rocks in the greenstone belts of southern India

机译：印度南部绿岩带超镁铁质岩石的二氧化碳固存潜力评估

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The growing universal concern about anthropogenically induced climate change is resulting in the development of strategies that can reduce or at least slow down the build-up of greenhouse gases in the atmosphere. Disposing of the excess carbon dioxide (CO sub(2)) by capturing it from industrial sources, separating it from flue gases and storing into potential geological reservoirs is emerging as a new technology for mitigating the detrimental effects of emissions and is referred to as carbon sequestration. An effective geochemical trapping system for storing the CO sub(2) underground is mineral carbonation. It is based on the weathering/alternation processes occurring in nature, wherein CO sub(2) reacts with Ca, Mg and/or Fe-bearing silicate-rich rocks such as ultramafics and mafics to form the respective carbonates. Under controlled experimental conditions with optimized reaction kinetics, mineral carbonation has considerable potential for the safe disposal of CO sub(2) in the form of environmentally benign carbonates. India has about twenty-five major greenstone belts with maximum thickness up to 10 km and lithologies containing Ca, Fe and Mg silicate-rich minerals such as olivine (Mg, FeSiO sub(4)), serpentine (Mg sub(3)Si sub(2)O sub(5)(OH) sub(4)), pyroxene (Mg, FeSiO sub(3)), etc. In this article, the mineral carbonation potential of ultramafic rocks of the greenstone belts of the southern Indian Peninsula is considered. The alkaline silicates exist in abundance in the greenstone belts and may act as possible sinks to sequester CO sub(2) in the form of magnesium, iron or calcium carbonates. The distribution of ultramafic rocks in southern India is noted and the approximate amounts of CO sub(2) that can be sequestered in the two greenstone belts of the southern Indian Peninsula, namely Kolar and Chitradurga is estimated. The areal extent of the Kolar belt is about 320 sq. km with an average width of similar to 6 km, while that of Chitradurga belt is 6000 sq. km and maximum depth determined is up to 10 km. Estimates show that an ultramafic portion of 1 km super(3) in the Kolar belt can store similar to 2.94 million tonnes (mt) of CO sub(2) and that in the Chitradurga belt similar to 4.7 mt, which accounts for about 0.6% of annual CO sub(2) production in India.
机译：人们对人为诱发的气候变化的日益关注引起了战略的发展，这些战略可以减少或至少减缓大气中温室气体的积累。通过从工业来源捕获过量的二氧化碳（CO sub（2）），将其与烟气分离并存储到潜在的地质储层中来处置多余的二氧化碳，是一种新兴的缓解排放有害影响的技术，被称为碳隔离。矿物碳酸化是一种有效的地球化学捕集系统，用于将CO sub（2）储存在地下。它基于自然界中发生的风化/蚀变过程，其中CO sub（2）与富含Ca，Mg和/或Fe的富含硅酸盐的岩石（如超镁铁矿和铁镁铁矿）反应形成相应的碳酸盐。在具有最佳反应动力学的受控实验条件下，矿物碳酸化具有安全处置以环境无害的碳酸盐形式存在的CO sub（2）的巨大潜力。印度有约25条主要绿岩带，最大厚度达10 km，岩性包含钙，铁和镁的富含硅酸盐的矿物，例如橄榄石（Mg，FeSiO sub（4）），蛇纹石（Mg sub（3）Si （2）O sub（5）（OH）sub（4）），辉石（Mg，FeSiO sub（3））等。在本文中，印度南部半岛绿岩带超镁铁质岩石的矿物碳化潜力被认为。碱性硅酸盐大量存在于绿岩带中，并可能以镁，铁或碳酸钙的形式螯合CO sub（2）。记录了印度南部超镁铁质岩石的分布，并估计了可在印度南部半岛的两个绿岩带（即科拉尔和奇特拉杜尔加）中封存的大约CO sub（2）量。 Kolar带的面积约为320平方公里，平均宽度约为6 km，而Chitradurga带的面积为6000平方公里，确定的最大深度可达10 km。估计显示，在Kolar带中1 km super（3）的超镁铁质部分可以存储约294万吨（mt）的CO sub（2），而在Chitradurga带中则可以存储4.7 mt，约占0.6％。印度每年的CO sub（2）生产量。

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