Nuclear Tracks And Radiation Measurements最新文献

英文中文

Palaeogeothermal interpretation of surface track-length distribution in apatite 磷灰石地表径迹长度分布的古地热解释

Nuclear Tracks And Radiation Measurements

Pub Date : 1993-10-01 DOI: 10.1016/1359-0189(93)90220-4

G. Wagner, E. Hejl

引用次数: 1

Age and tectonic evolution of the olympic subduction complex as inferred from FT ages for detrital zircons 从碎屑锆石的FT年龄推断奥林匹克俯冲杂岩的年龄和构造演化

Nuclear Tracks And Radiation Measurements

Pub Date : 1993-10-01 DOI: 10.1016/1359-0189(93)90269-F

Brandon Mark T.

引用次数: 0

Horizontal confined lengths of spontaneous and induced fission tracks in zircon 锆石中自发和诱导裂变径迹的水平限制长度

Nuclear Tracks And Radiation Measurements

Pub Date : 1993-10-01 DOI: 10.1016/1359-0189(93)90256-9

引用次数: 0

Possible secondary apatite fission track age standard from altered volcanic ash beds in the middle Jurassic Carmel Formation, Southwestern Utah 犹他州西南部中侏罗世卡梅尔组蚀变火山灰床中可能的次生磷灰石裂变径迹年龄标准

Nuclear Tracks And Radiation Measurements

Pub Date : 1993-10-01 DOI: 10.1016/1359-0189(93)90192-C

Bart J. Kowallis , Eric H. Christiansen , Brent H. Everett , Kevin D. Crowley , Charles W. Naeser , Donald S. Miller , Alan L. Deino

Secondary age standards are valuable in intra- and interlaboratory calibration. At present very few such standards are available for fission track dating that is older than Tertiary. Several altered volcanic ash beds occur in the Middle Jurassic Carmel Formation in southwestern Utah. The formation was deposited in a shallow marine/sabhka environment. Near Gunlock, Utah, eight ash beds have been identified. Sanidines from one of the ash beds (GUN-F) give a single-crystal laser-probe ⁴⁰Ar/³⁹Ar age of 166.3±0.8 Ma (2σ). Apatite and zircon fission track ages range from 152–185 Ma with typically 15–20 Ma errors (2σ). Track densities in zircons are high and most grains are not countable. Apatites are fairly common in most of the ash beds and have reasonable track densities ranging between 1.2–1.5 × 10⁶ tracks/cm². Track length distributions in apatites are unimodal, have standard deviations <1μm, and mean track lengths of about 14–14.5 μm. High Cl apatites (F:Cl:OH ratio of 39:33:28) are particularly abundant and large in ash GUN-F, and are fairly easy to concentrate, but the concentrates contain some siderite, most of which can be removed by sieving. GUN-F shows evidence of some reworking and detriaal contamination based on older single grain ⁴⁰Ar/³⁹Ar analyses and some rounding of grains, but the apatite population appears to be largely uncontaminated. At present BJK has approximately 12 of apatite separate from GUN-F.

中学年龄标准在实验室内部和实验室间校准中是有价值的。目前很少有这样的标准可用于比第三纪更早的裂变径迹定年。犹他州西南部中侏罗统卡梅尔组中出现了几处蚀变火山灰床。该组沉积于浅海/沙布卡环境。在犹他州的冈洛克附近，已经发现了八个火山灰床。其中一个灰层(GUN-F)的碱基给出了单晶激光探针40Ar/39Ar年龄为166.3±0.8 Ma (2σ)。磷灰石和锆石裂变径迹年龄范围为152 ~ 185 Ma，典型误差为15 ~ 20 Ma (2σ)。锆石的径迹密度高，多数颗粒不可计数。磷灰石在大多数灰层中相当普遍，其轨道密度在1.2-1.5 × 106轨道/cm2之间。磷灰石中径迹长度呈单峰分布，标准差为1μm，平均径迹长度约为14 ~ 14.5 μm。高Cl磷灰石(F:Cl:OH比为39:33:28)在灰分gunf -F中含量特别丰富，体积特别大，且相当容易富集，但精矿中含有一定的菱铁矿，通过筛分可除去大部分菱铁矿。根据较老的单粒40Ar/39Ar分析和一些磨圆的颗粒，GUN-F显示出一些改造和碎屑污染的证据，但磷灰石种群似乎大部分未受污染。目前BJK有大约12个磷灰石从GUN-F分离出来。

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引用次数: 11

Dating zircon by combined use of fission and alpha tracks 结合使用裂变径迹和α径迹测定锆石年代

Nuclear Tracks And Radiation Measurements

Pub Date : 1993-10-01 DOI: 10.1016/1359-0189(93)90193-D

M. Kasuya, H. Iwano, T. Danhara

A new approach to dating zircon by combining fission and alpha tracks is described. In this method (alpha track method), spontaneous fission tracks in a sample are counted routinely and alpha tracks originating from the sample are counted on a plastic track detector. Uranium content of the sample is monitored based on the alpha track density and the detection time. Radioactive equilibrium and equal Th/U ratios among samples are assumed. A comparison between the conventional fission track method and the alpha track method has been made using age standard and other zircon samples. The results suggest that the alpha track method provides acceptable dating results when internal zircon surfaces are used for track counts. The alpha track method should be beneficial to those who do not have close access to neutron irradiation facilities.

描述了一种结合裂变径迹和α径迹测定锆石年代的新方法。在这种方法(α径迹法)中，对样品中的自发裂变径迹进行常规计数，并在塑料径迹检测器上对样品中产生的α径迹进行计数。根据α径迹密度和检测时间监测样品的铀含量。假定样品间的放射性平衡和Th/U比值相等。利用年龄标准和其他锆石样品，对传统的裂变径迹法和α径迹法进行了比较。结果表明，当使用锆石内部表面进行径迹计数时，α径迹法可以提供可接受的测年结果。α径迹法对那些不能近距离接触中子辐照设施的人是有益的。

引用次数: 1

New evidence for propagation of the opening of the Red Sea: An apatite fission-track study 红海开口扩张的新证据:磷灰石裂变径迹研究

Nuclear Tracks And Radiation Measurements

Pub Date : 1993-10-01 DOI: 10.1016/1359-0189(93)90203-L

G. Omar, M. Steckler

引用次数: 1

Results of interlaboratory comparison of fission track ages for 1992 fission track workshop 1992年裂变径迹车间裂变径迹年龄实验室间比较结果

Nuclear Tracks And Radiation Measurements

Pub Date : 1993-10-01 DOI: 10.1016/1359-0189(93)90197-H

Donald S. Miller , Kevin D. Crowley , Roy K. Dokka , Rex F. Galbraith , Bart J. Kowallis , Charles W. Naeser

Two apatites and one sphene were made available to the fission track research community for analysis prior to the 1992 Fission Track Workshop held in Philadelphia, U.S.A., 13–17 July. Eighteen laboratories throughout the world received aliquots of apatite and sphene. To date, analyses by 33 different scientists have been representing 15 different laboratories. With respect to the previous two interlaboratory comparisons, there is a noticeable improvement in the accuracy of the age results (Naeser and Cebula, 1978; Naeser et al., 1981; Miller et al., 1985;Miller et al.1990). Ninety-four percent of the analysis used the external detector method (EDM) combined with the zeta technique while the remaining individuals used the population method (POP). Track length measurements (requested for the first time in the interlaboratory comparison studies) were in relatively good agreement.

在1992年7月13日至17日在美国费城举行的裂变轨道研讨会之前，向裂变轨道研究界提供了两颗磷灰石和一颗榍石进行分析。全世界有18个实验室收到了等量的磷灰石和榍石。迄今为止，由33位不同的科学家代表15个不同的实验室进行了分析。与前两次实验室间比较相比，年龄结果的准确性有显著提高(Naeser和Cebula, 1978;Naeser et al.， 1981;Miller et al.， 1985;Miller et al.1990)。94%的分析使用外部检测器法(EDM)结合zeta技术，其余个体使用种群法(POP)。径迹长度测量(在实验室间比较研究中首次要求)的一致性相对较好。

引用次数: 26

Estimation of geological parameters from projected lengths and angles 根据投影长度和角度估算地质参数

Nuclear Tracks And Radiation Measurements

Pub Date : 1993-10-01 DOI: 10.1016/1359-0189(93)90233-Y

Rex Galbraith

引用次数: 0

Fission track dating of authigenic apatite in cambrian sediments, Southern Israel: Implications for timing of initiation of the Dead Sea transform 以色列南部寒武纪沉积物中自生磷灰石的裂变径迹测年：对死海转变起始时间的影响

Nuclear Tracks And Radiation Measurements

Pub Date : 1993-10-01 DOI: 10.1016/1359-0189(93)90223-V

Kohn Barry P., Weissbrod Tuvia

引用次数: 1

Isothermal plateau fission track age determinations on volcanic glass from pleistocene tephra in New Zealand 新西兰更新世火山玻璃的等温平台裂变轨道年龄测定

Nuclear Tracks And Radiation Measurements

Pub Date : 1993-10-01 DOI: 10.1016/1359-0189(93)90244-4

引用次数: 0

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