摘要
新生代全球气候自始新世 5 5 Ma以来在逐渐变冷。陆地硅酸盐岩在造山带和高原地区通过加速化学风化 ,消耗了大气中的 CO2 温室气体造成了新生代气候变冷。目前关于陆地硅酸盐岩风化与海洋 Sr同位素关系的研究 ,主要存在两种观点 :一种认为海水Sr同位素变化可作为全球地表化学风化的替代性标志 ;另一种观点认为全球并不存在平均地表风化这种说法 ,海水 Sr同位素在地质历史中的演化是主要与某种地质构造事件或岩石类型的风化有关。我国应当不失时机地加快对源于喜玛拉雅山地的恒河布拉马普特拉河进行研究 ,以进一步揭示陆地硅酸盐岩风化与海洋 Sr同位素变化的关系。
The global climate of Cenozoic had become cool gradually Since the Eocene (55 Ma), mainly because of the consumption of the atmospheric carbon dioxide (green house gas) resulting from the strong chemical weathering of the silicate rocks in the orogenic belt and plateau. Until now, there are two views about the relationship between chemical weathering of silicate rocks and marine Sr isotope. One is that the change of marine Sr isotope could be used as the proxy of the average continental chemical weathering; By contrast, the other claims that the evolution of the marine Sr isotope in the geologic record has the direct relationship with the specific geologic tectonic events or the particular rocks, with no acknowledgement of the global average continental chemical weathering. The authors suggest we should investigate the Ganges Brahmaputra rising from Himalayan mountain in good time to reveal deeply the relationship of them.
出处
《矿物岩石》
CAS
CSCD
北大核心
2002年第1期31-35,共5页
Mineralogy and Petrology
基金
国土资源部国际合作与科技司"青藏高原东部河流水化学和沉积地球化学研究"项目 (编号 :992 0 10 )
关键词
新生代
气候变化
硅酸盐岩
化学风化
海水
锶同位素
Cenozoic
climate change
chemical weathering of silicate rock
marine strontium isotope
