The Hf isotope ratios were determined by a Micromass Isoprobe multiple collector-inductively coupled plasma mass spectrometry (MC-ICP-MS) for two international zircon standards 91500 and Temora and one in-house zircon standard We-1.

The earliest biomineralizing animal Cloudina:an important index fossil in the Late Ediacaran

For ensuring safety production,confirming gushing water sources of coal mines with mining,and accurately using prevention and cure scheme,we draw off water samples from the aquifer influencing mining production,and test and analyze their quality,and establish the standard water samples.

According to corrosion classification criteria in international petroleum industry and documents concerning injected water quality in China,the author evaluates and optimizes control indications of injected water quality standards and gets good effects.

A great deal of comparisons on domestic and international water quality standards of intermediate water are passed,and draw some conclusions : The requirement of the domestic and international water quality standards of intermediate water is similar in the pH,solid suspending matter,dissolved solids,total P,ammonia nitrogen,chromaticity and so on.