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激光熔蚀40Ar/39Ar等时线法是第四纪年轻火山岩样品精细定年的新方法, 该方法处于逐步完善过程中。针对怎样判定获得的年龄结果是否可靠的问题, 通过对数据处理过程中所用参数的分析, 认为样品属性是决定年轻火山岩精细定年结果质量和可靠性的关键因素, 与样品测试数n值相关的加权均方差MSWD(mean square weighted deviation)是判断同一样品各测试点的数据是否符合正态分布, 能否用来客观地评价测试结果, 进而评估样品是否适合进行相关测试, 结果是否可靠的重要指标。其次, 属于同一真实年龄值样品的MSWD在99.7%置信区间的取值范围可通过计算加以确认, 并提出对于表面年龄和等时线年龄数据, 必须定量地考察相应的MSWD值, 判定在具有足够样品测试数(足够大的n值)的情况下, 是否符合概率统计的正态分布, 确定样品是否对应同一年龄真实值。在MSWD值达不到理想值1.0的情况下, 可以利用表面年龄概率密度曲线, 区分测试样品内部包含的非同源或非等时或封闭不好体系的数据, 再结合MSWD与n值关系, 适量地去除部分偏离正态分布的测试数据, 识别出可能归属多个年龄真实值的测试数据组, 并以此计算不同数据组的反等时线年龄, 获得年轻火山岩喷发的准确年龄。 相似文献
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Weixuan Fang Ruizhong Hu Wenchao Su Jiafei Xiao Liang Qi Guohao Jiang 《科学通报(英文版)》2002,47(10):874-880
Emplacement ages of lamproites that comprise lamproite and olivine lamproite in Zhenyuan County, Guizhou Province, China, have been constrained by the whole-rock Sm-Nd and Rb-Sr isochron methods and the whole rock K-Ar method. Intrusive activities of lamproites in the Sinantang area of Zhenyuan County, Guizhou Province, took place during the Late Cambrian, as indicated by the Sm-Nd isochron ages ( t ) = (503 ± 17) (2σ) Ma and by the Rb-Sr isochron ages ( t ) = (501.2 ± 4.6) (2σ) Ma. Intrusive activities of olivine lamproites at the Maping with Ⅱ-type diamond and Xitou in Zhenyuan County, Guizhou Province, took place from the Late Cambrian to the Early Ordovician, as evidenced by the Sm-Nd isochron ages ( t ) = (502 ± 27) (2σ) Ma and by the Rb-Sr isochron age ( t ) = (502 ± 27) (2σ) Ma. This suggests that the upwelling hot materials derived from the deep mantle were emplaced from the Late Cambrian to the Early Ordovician (503-497 Ma), while the time terminal of cooling of the geothermal event of magmatism-tectonism probably was at 442.64-435.54 Ma, as dated by the whole rock K-Ar method. 相似文献
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Age of granulite from Huangtuling, Dabie Mountain: Pb-Pb dating of garnet by a stepwise dissolution technique 总被引:9,自引:0,他引:9
Hanwen Zhou Xianhua Li Ying Liu Zhendong You Shutian Suo Zengqiu Zhong 《科学通报(英文版)》1999,44(10):941-941
A new stepwise dissolution scheme, involving acids with different properties, enables the selective recovery of radiogenic
and common Pb from a mineral, and makes single-mineral Pb-Pb dating possible. Garnet from a granulite sample from Huangtuling,
northern Dabie Mountain yields a Pb-Pb isochron age of (1998 ±35) Ma, which is interpreted as the timing of peak metamorphism
of granulite facies. 相似文献
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Sm-Nd isochron age of ophiolite along northern margin of Altun Tagh Mountain and its tectonic significance 总被引:2,自引:0,他引:2
An ophiolite belt is exposed to the northern edge of Altun Tagh Mountain. Geochronological researches were made on gabbro
and basalt. Sm-Nd isochron age of gabbro is (829 ± 60) Ma, while the age of gabbro mixed basalt is (949 ± 62) Ma. The dating
of Sm-Nd isochron proves that ophiolite formed in (829 ± 60) Ma, which implies that the northern half of Tarim (or north Tarim
Block) had been separated by an ocean from the southern half of Tarim and Qaidarn (or south Tarim Block) until (829 ± 60)
Ma. The south Tarim Block could accrete to the north Tarim Block at the beginning of Sinian, thereby forming the north Altun
Tagh suture. The Sinian system would be the first cover on the amalgamated Tarim craton. 相似文献
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Zhaoyu Zhu Teh-Lung Ku Shangde Luo Houyun Zhou Qizhong Wen Shijie Li Bingyuan Li Hongchun Li 《科学通报(英文版)》2001,46(10):862-867
The age of the clastic-clay sediments with varied content of carbonate in core TS95 taken from the Lake Tianshuihai in the
northwest of the Tibetan Plateau was determined successfully by using the total sample dissolution U-series isochron method
for the first time. With this method, the serial absolute timescale (isotope time scale) covered the last 240 ka in the main
body of the Tibetan Plateau with a sea level up to 4000 m is also established for the first time, thereby laying the foundation
for the research on the paleoclimate and palaeoenvironment in the Lake Tianshuihai region as well as the relationship between
evolution of the Tibetan Plateau and global changes. In addition to a brief introduction of the basic principles, the procedures
of experiments, and the results, this note also presents the adaptability and superiority of this method as well as its possible
problems. 相似文献
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The Rb-Sr isochron of ore and pyrite sub-samples from Linglong gold deposit, Jiaodong Peninsula, eastern China and their geological significance 总被引:9,自引:1,他引:8
Here we report the first direct Rb-Sr dating of pyrites and ores using sub-sampling from lode gold deposits in Linglong, Jiaodong
Peninsula, which is a supra-large lode gold deposit and propose this as a useful geochronological technique for gold mineralization
with poor age constraint. The Rb-Sr data of pyrites yield an isochron age of (121.6±8.1) Ma, whereas those of ore and ore-pyrite
spread in two ranges from 120.0 to 121.8 Ma and from 110.0 to 111.7 Ma. Studies of characteristic of gold deposit and microscopy
of pyrite and quartz indicate that the apparent ages of ore and ore-pyrite are not isochron ages, only mixed by two end members,
i.e. the primitive hydrothermal fluids and wall rocks, whereas the isochron age of pyrite sub-samples constrains the age of
gold mineralization (121.6±8.1) Ma, i.e. early Cretaceous, which is in good agreement with the published SHRIMP zircon U-Pb
ages. 相似文献
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