搜索结果: 16-30 共查到“理学 U and Th”相关记录77条 . 查询时间(0.093 秒)
新疆东天山红云滩地区构造-热演化探讨:来自Ar-Ar和(U-Th)/He热年代学的约束
热演化历史 红云滩岩体 东天山
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2015/12/30
红云滩岩体位于东天山觉罗塔格西部，对其进行热演化历史研究对于揭示觉罗塔格地区乃至整个东天山地区的
构造热演化历史具有重要意义。本文对红云滩岩体进行黑云母 ＡｒＡｒ、锆石（ＵＴｈ）／Ｈｅ和磷灰石（ＵＴｈ）／Ｈｅ测年，并结合前
人的锆石 ＵＰｂ测年结果，精细刻画出该岩体自形成以后经历的热演化过程，并据此识别出东天山红云滩地区发生过多期快
速抬升冷却事件。黑云母阶段升温 ＡｒＡｒ法同位...
Endogenous Technological Change In Th DICE Integrated Assessment Model
Endogenous Technological Change DICE Integrated Assessment Model
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2014/10/22
Integrated Assessment Models (IAM)s play a key role in climate policy research; however, many IAMs are limited by their treatment of technological change. This is a particularly vexing limitation beca...
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...
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
Isotopic Composition Sediments the Cretaceous Western Interior Seaway Oceanic Anoxic Event 3 Mesa Verde CO USA
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2014/10/20
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...
Th Wild Sky Wilderness Proposal: Politics, Process, and Participation in Wilderness Designation
Wilderness Washington State National Forests Local Participation Political Ecology Conservation
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2014/10/20
Wild Sky, a proposed wilderness in Washington State, has been a source of local contention since its inception. Drawing on the theories of political ecology, international conservation, and actor-base...
ON UNIQUENESS OF SOLUTION OF A n-TH ORDER DIFFERENTIAL EQUATION IN CONFORMAL GEOMETRY
ON UNIQUENESS OF SOLUTION A n-TH ORDER DIFFERENTIAL EQUATION CONFORMAL GEOMETRY
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2014/4/3
In this paper, we prove an uniqueness theorem for a n-th order elliptic equation on the standard n-sphere Sn. The problem arises naturally from the point of view of conformal geometry. The method we u...
Th-normalized fluxes of biogenic components from the central and southernmost Chilean margin over the past 22,000 years
biological pump paleoproductivity thorium 230 (230Th) southern westerlies Chile
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2017/4/11
We report on 230Th-normalized fluxes of biogenic components—total organic carbon (TOC), total nitrogen (TN),
calcium carbonate (CaCO3), and biogenic opal (SiOPAL)—from two sediment cores collected at...
松潘甘孜长沙贡玛盆地古近纪地层碎屑锆石U-Pb年龄与Hf同位素组成及碎屑磷灰石(U-Th)/He年龄的地质意义
碎屑锆石 (U-Th)/He年龄 松潘甘孜 青藏高原
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2014/1/16
青藏高原隆升和剥蚀是从大陆岩石圈变形到全球变冷等新生代众多地质事件诱发的关键因素。目前针对这一问题的研究主要集中在高原中部的拉萨和羌塘地区,高原东部的松潘甘孜地体关注甚少。本文报道了在松潘甘孜地体中西部的长沙贡玛盆地获得的碎屑锆石U-Pb年龄、Hf同位素组成以及磷灰石(U-Th)/He年龄的结果。长沙贡玛盆地古近纪沉积物以分选极差的砾岩、岩屑砂岩和块状泥岩为主,表明其为近源快速堆积环境下形成的。砂...
Crystallographic Study of U-Th bearing minerals in Tranomaro, Anosy Region- Madagascar
Crystallographic Study U-Th bearing minerals Anosy Region- Madagascar Geophysics
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2012/4/20
As an alternative to conventional fossil fuel, there is a renewed interest in the nuclear fuel to support increasing energy demand. New studies are then undertaken to characterize Madagascar U-Th bear...
The alpha-calculus-cum-alpha-analysis of r-th order derivative of zeta(s,alpha)
Hurwitz zeta function Bernoulli polynomials /numbers Number Theory
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2011/9/14
Abstract: For the higher order derivative(with respect to the first variable) of Hurwitz zeta function,we discuss as a function of the second variable,the location and the nature of its singularities ...
An identity on the $2m$-th power mean value of the generalized Gauss sums
2m-th power mean exact calculating formula generalized quadratic Gauss sums Number Theory
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2011/9/5
Abstract: In this paper, using combinatorial and analytic methods, we prove an exact calculating formula on the $2m$-th power mean value of the generalized quadratic Gauss sums for $m\geq 2$. This sol...
独居石成因特征与U-Th-Pb定年及三江特提斯构造演化研究例析
独居石成因特征 U-Th-Pb地质年代学 三江特提斯构造演化
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2014/1/17
独居石U-Th-Pb定年在地质年代学研究中占有重要地位,但其成因类型的识别和年龄值的合理地质解释始终是研究的难点。论文通过对比分析岩浆、热液和沉积成因独居石的内部结构、矿物组合以及稀土和微量元素地球化学特征,厘定了不同成因类型独居石的鉴别标志;并以三江特提斯构造演化研究为例,探讨了独居石的U-Th-Pb定年及其合理地质应用。不同地质环境中形成的独居石具有不同的内部结构和矿物组合及元素组成:岩浆独居...