Re os dating arsenopyrite


Geochronological investigations in China have been evolved in three major stages: (1) early establishment of geochronological laboratories and initiation of education of isotope geochemistry during late 1950s and 1966; (2) increasing availability of commercial mass spectrometers and increased application of geochronology in geosciences during late 1970s and early 1990s; and (3) establishment of state-of-the-art geochronological laboratories, which represented an important stepping stone for much progress of China's geosciences during the past decade.

The initiation and development of geochronological research in China was a result of the recognition of its fundamental importance to the understanding of the geological evolution of China's landmass and its exploitation for mineral deposits.

During the late 1950s and early 1960s, geochronological laboratories were firstly established in two institutions, namely the Chinese Academy of Sciences and the Chinese Academy of Geological Sciences in Beijing.

The establishment of the K-Ar and U-Pb dating techniques at these institutions were initiated and led by Profs. At the time, education of isotope geochronology and geochemistry was spearheaded by the Department of Geochemistry at the University of Science and Technology of China.

Development of Re-Os geochronology for crustal matrices has been ongoing since 1998 in the laboratory.

This work has resulted in major advancements in the direct isotopic dating of crustal sulfide minerals, petroleum source-rocks, and natural hydrocarbons, using Re-Os isotopes.

I remember a magnificent kingdom, in a saltwater fish tank I had once and never had again.

Before I could lift the silver anchor--the Morning Star--over my head with only one hand, turning gold in that morning sun-- I was a boy who sat indian style, cross legged--peering into this brilliant spectacle of light I thought awesome.

The pyrite samples were decomposed in carius tubes, Os was separated by distillation and Re was extracted by acetone, respectively.

The results show that the Re-Os isochron age is 229±38 Ma (MSWD=2.0, confidence level is 95%), with an initial Os value of 0.68±0.24 and a corresponding γOs value of 442±91.

The Re/Os ratios of the pyrite vary from 40.8 to 100.5.

The data suggest that at least one important ore-forming event was occurred during Indosinian epoch, and the ore-forming materials probably derived from mixed sources of crustal and mantle, while the later dominated.

A full publication list for Re-Os is available here.

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