搜索结果: 1-9 共查到“地球物理学 SR”相关记录9条 . 查询时间(0.093 秒)
在海洋同位素均衡中，地下水输入的溶质通量长久以来被认为是不变的，且经常被忽视，即使不能完全忽视，也将这一部分归于河流输入的通量。由于缺乏对地下水排泄溶质通量的约束，海洋同位素δ7Li、δ26Mg、δ44/42Ca、87Sr/86Sr、δ88/86Sr和δ138Ba的均衡和依赖它们的准确性建立的地球系统模型存在巨大不确定性。
造山带的古高度研究一直是造山带演化和古气候研究中的重要内容。目前，常用的古高度计算方法是通过古生物化石记录和稳定同位素，如古动物和古植物化石，碳酸盐的氢-氧同位素或团簇同位素等。然而这两种方法均依赖于沉积岩，因此难以获得与古高度直接对应的年代学数据，且难以应用于前新生代的古老造山带。
磷灰石分布普遍，由于含有丰富的有用元素（F、Cl、S、Fe、Mn、Sr、REE）和同位素（Sr、Nd、O），已被广泛应用于示踪岩石成因。众多实验岩石学和矿床实例研究结果揭示出磷灰石结构和成分极易受到中高温（300℃-900℃）流体（包括卤水相流体、H2O-CO2流体、酸性流体）的改造，但对低温流体（<300℃）是否可以显著改变和影响磷灰石结构和Sr同位素，目前仍不清晰，相关研究将直接影响利用磷灰石...
兴蒙造山带中段锡林浩特跃进地区出露一套石炭纪侵入岩，具有类似岛弧侵入岩的岩石组合(花岗闪长岩、英云闪长岩、石英闪长岩)和地球化学特征.锆石LA-MC-ICP-MS U-Pb测年结果表明，这套侵入岩形成时代为310~330 Ma，属于石炭纪中晚期.岩石地球化学分析表明，跃进侵入岩属于钠质钙碱性系列岩石；A/CNK范围为0.86~1.17，大多属于准铝－弱过铝质系列；样品均具有较高的Mg#值，范围为4...
Geochronology, Geochemistry and Sr-Nd-Pb-Hf Isotopes of No. I Complex from the Shitoukengde Ni–Cu Sulfide Deposit in the Eastern Kunlun Orogen, Western China: Implications for the Magmatic Source, Geodynamic Setting and Genesis
Sr-Nd-Pb-Hf isotopes crustal contamination oceanic slab break-off post-collisional extension Shitoukengde Ni-Cu deposit Eastern Kunlun Orogen
2018/4/10
The Shitoukengde Ni-Cu deposit, located in the Eastern Kunlun Orogen, comprises three mafic–ultramafic complexes, with the No. I complex hosting six Ni-Cu orebodies found recently. The deposit is host...
Novel method for low level Sr-90 activity detection in seawater by combining oxalate precipitation and chelating resin extraction
strontium-90 nuclear power plant seawater monitoring preconcentration oxalate precipitation
2017/4/10
Sr released into seawater from nuclear bomb testing and nuclear facility accident sites requires long-term monitoring.
However, measuring 90Sr in seawater is still difficult and time-consuming. This ...
The 3550 year BP-1944 A.D.magma-plumbing system of Somma-Vesuvius: constraints on its behaviour and present state through a review of Sr-Nd isotope data
Somma-Vesuvius magma chamber crustal contamination
2015/9/15
Vesuvius, dominating the densely-populated Neapolitan area, is one of the most dangerous volcanoes in the World. Its destructive power derives from energetic subplinian and plinian eruptions, such as ...
Migration history of an ariid Indian catfish reconstructed by otolith Sr/Ca and d18O micro-analysis
otolith oxygen isotope carbon isotope Sr/Ca Ba/Ca
2017/4/10
Understanding catfish ecology is important because catfish constitute one of the largest fish stocks in the coastal IndoPacific
regions. Recent technological advances have enabled the use of biologic...