搜索结果: 1-6 共查到“地球科学总论 U and Th”相关记录6条 . 查询时间(0.154 秒)
Th Effcts of Sea Level Change on the Molecular and Isotopic Composition of Sediments in the Cretaceous Western Interior Seaway: Oceanic Anoxic Event 3, Mesa Verde, CO, USA
Sea Level Change on the Molecular Isotopic Composition Sediments Cretaceous Western Interior Seaway Oceanic Anoxic Event 3 Mesa Verde CO USA
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2014/10/22
Cretaceous Oceanic Anoxic Events (OAEs) represent periods of enhanced burial of organic matter in black shale in marine, continental margin, and epicontinental settings around the globe. Compared to o...
Evolution Of Volatile Content Of Th Parent Magma Of Th 1875 Eruption Of Askja Volcano, Iceland
Evolution Of Volatile Content Parent Magma The 1875 Eruption Askja Volcano, Iceland
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2014/10/21
The Askja central volcano is located in the northeastern rift zone in central Iceland. The bulk of the eruption of Askja on March 28-29 1875 consisted of a plinian eruption that lasted 6-7 hours, prod...
An Integrated Study of the South-Central Part of the Springerville Volcanic Field; Th Final Piece
South-Central Part Springerville Volcanic Field The Final Piece
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2014/10/21
An Integrated Study of the South-Central Part of the Springerville Volcanic Field; Th Final Piece.
Th Sedimentological and Geomorphological Response of a Glacially Conditioned Watershed to Event Induced Flooding: Insights from the Connecticut River and Hurricane Irene
Sedimentological Geomorphological Response a Glacially Conditioned Watershed Event Induced Flooding Connecticut River Hurricane Irene
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2014/10/21
Tropical Storm Irene’s most extreme rainfall resulted in record-breaking sediment loads from upland tributaries to the Connecticut River. However, was the event exceptional with respect to resultant d...
Geochronology of high-grade metamorphism in the Sveconorwegian belt,S. Norway:U-Pb,Th-Pb and Re-Os data
Geochronology high-grade metamorphism Sveconorwegian belt U-Pb Th-Pb Re-Os
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2009/12/2
The timing of Sveconorwegian high-grade metamorphism is evaluated in the four lithotectonic units / terranes exposed in the Sveconorwegian belt in South Norway. U-Pb, Th-Pb and Re-Os data were obtaine...
（UTh）／He定年———低温热年代学研究的一种新技术
（UTh）／He 定年 低温热年代学
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2007/12/12
Abstract近年来（UTh）／He定年方法在技术和低温热年代学应用上的优势吸引人们以此开展构造、地形地貌演化等的研究；与裂变径迹、KAr、ArAr等定年方法的比较，该方法是有效的；人们研究了温度及矿物粒径对He扩散的影响，确定了校正方法。（UTh）／He的封闭温度低于其它体系（磷灰石的仅为75℃±）；有质谱仪只需数十毫克样品就能获得 U、Th、He含量；有较裂变径迹法快速、省样、省力的...