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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >An occurrence of similar to 74 ka Youngest Toba Tephra from the WesternContinental Margin of India
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An occurrence of similar to 74 ka Youngest Toba Tephra from the WesternContinental Margin of India

机译：与印度西部大陆边缘的74 ka最小的Toba Tephra相似

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摘要

A dispersed volcanic ash layer was recovered at similar to 300 cm depth in a 5.52 m long sediment core collected at a latitude 9 degrees 21 'N and longitude 71 degrees 59 'E from a water depth of 2300 m on the Western Continental Margin of India (WCMI). Glass shards from ash layer were studied for morphology, major, trace and rare earth element concentration to trace the source, Bubble wall junction-type morphology of glass shard suggests magmatic origin. shards have high SiO2 (77%) and total alkalis (8.5%), indicating rhyolitic composition. The major, trace and rare earth element composition of these glass shards are indistinguishable from that of Youngest Toba ash of similar to 74 ha from the Northern Sumatra and confirm as the source. The new occurrence of Youngest Toba Tuff from the WCMI, Central Indian Ocean Basin and South China Sea Basin suggests a reassessment of the ash volume and global climatic implications.
机译：从印度西部大陆边缘2300 m的水深中，在一个纬度9度21'N和经度71度59'E收集的5.52 m长的沉积岩心中，以大约300 cm的深度回收了分散的火山灰层。 （WCMI）。研究了来自灰分层的玻璃碎片的形态，主要，痕量和稀土元素浓度，以追踪其来源。玻璃碎片的气泡壁结型形态暗示了岩浆成因。碎片具有较高的SiO2（77％）和总碱（8.5％），表明流纹组成。这些玻璃碎片的主要，痕量和稀土元素组成与苏门答腊北部约74公顷的最年轻鸟羽灰分没有区别，并且可以确定其来源。 WCMI，中印度洋盆地和南海盆地新出现的最年轻的鸟羽凝灰岩表明对灰分量和全球气候影响进行了重新评估。

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