Oxygen deficient syndrome beneath the Super Continent : role of graphite in grobal carbon cycling

石墨是一种广泛存在于各种表壳岩中的常见副矿物，它们在一定的压力、温度和化学惰性范围内变质。另一方面，报道了固体碳（石墨）从天然含碳流体如含有CO2、CO和/或CH 4的那些中沉淀。重点讨论了幔源流体继承型石墨矿床的成因和碳同位素组成。2003年，我们对马达加斯加石墨的产出进行了调查，首次发现了与印度南部和斯里兰卡发现的典型早期紫苏花岗岩非常相似的新的早期紫苏花岗岩。这些早期紫苏花岗岩被认为是在印度和斯里兰卡的高度干燥（缺水）的变质作用下形成的。在马达加斯加，这种charbonkitic岩石的出现也告知了缺水流体的存在，它渗透到冈瓦纳大陆的深部地壳岩石中 ...更多信息 上地壳2004年，我们在印度南部Achancovil剪切带进行了石墨产状调查，石墨产于含配子-尖晶石片麻岩的榴辉岩中，并在2003-2005年项目期间，我们调查了马达加斯加、南非、印度南部、乌克兰和希腊的石墨产状。在深变质壳幔源岩中发现了石墨的新产状。我们还与高知大学的M.Santosh教授和横滨国立大学的M.Arima教授合作，在高知大学举办了冈瓦纳大陆演化和扩散的国际研讨会和实地研讨会。我们组织了题为冈瓦纳地壳中的流体的特别会议。来自Sapin、斯里兰卡和乌克兰的四位特邀演讲嘉宾介绍了冈瓦纳超大陆与石墨产出有关的地壳演化的最新地球化学和地质学特征。少

Graphite is a widespread and common accessory mineral in a variety of supracrustal rocks metamorphosed over a range of pressure temperature, and chemical inertness. On the other hand the precipitation of solid carbon (graphite) from natural carbon bearing fluids was reported such as those containing CO2,CO and/or CH4. We focused on the origin and carbon isotope of mantle related fluid inherited graphite deposits as a vein and magmatic types. During in 2003, we sueveyed the occurrence of graphite in Madagascar and at the first time found of new occurrence of incipient charnockitic rocks which is very similar to the typical incipient charnockite discovered in Southern India and Sri Lanka. These incipient charnockite were believed to be formed descication of metamorphism with highly dry(deficient of water) in India and Sri Lanka. In Madagascar, this occurrence of charnockitic rocks also informed the water deficient fluid presence which penetrated on the deep crustal rocks in the Gondwana … More supracrust. In 2004, we surveyed the graphite occurrences in Achancovil Shear Zone, south India where graphite occurrece of eclogitic rocks in gamet-spinel bearing gneiss and gave us the significant signature of mantle carbon in isotopes.We investigated during the project periods between 2003-2005 the occurrences of graphites in Madagascar, South Africa, Southern India, Ukraine, and Greece. We discovered the newly occurrence of graphites in highly metamorphosed crustal and mantle originated rocks. We also held an International symposium and field workshop on Gondwana evolution and dispersal in Kochi University collaborating with Profs.M.Santosh of Kochi Univesity and M.Arima of Yokohama National University. We organized the special sessions entitled the Fluids in the Gondwana Crust. Four special guest speakers invited from Sapin, Sri Lanka and Ukraine are presented the newly geochemical and gelogoical characteristics with the crustal evolution related with the occurrence of graphites in the Gondwana supercontinent. Less