51 diatom samples taken from the piston core PC10 in the Bransfield Strait of West Antarctica were determined by using silica oxygen isotope analysis.The diatom based results reveal that the 753 cm long core PC1...51 diatom samples taken from the piston core PC10 in the Bransfield Strait of West Antarctica were determined by using silica oxygen isotope analysis.The diatom based results reveal that the 753 cm long core PC10 was deposited in the area in the last 112 5 ka B.P., representing 1 5 oxygen isotopic stages and including one incomplete glacial/interglacial cycle and a postglacial period. The sedimentation rate in interglacial period seems to be a little higher than that in glacial, owing to the more terrigenous supply by ice rafting during the interglacial stages.展开更多
The H and O isotope compositions of 41 whole rocks and 24 separated minerals of theNianzishan miarolitic alkaline granite and 3 local meteoric water samples have been meas-ured. The results indicate that the meteoric-...The H and O isotope compositions of 41 whole rocks and 24 separated minerals of theNianzishan miarolitic alkaline granite and 3 local meteoric water samples have been meas-ured. The results indicate that the meteoric-hydrothermal convective system might have beendeveloped in this stock. The distributions of δ^(18)O values of whole-rock samples formed anapproximateIy δ^(18)O contours with the characteristic of kighest values in the midst and de-creasing toward the outer zones. The water/rock ratio (W/R) contours were also calculated.This phenomenon might have common significance for stocks or plutons.展开更多
文摘51 diatom samples taken from the piston core PC10 in the Bransfield Strait of West Antarctica were determined by using silica oxygen isotope analysis.The diatom based results reveal that the 753 cm long core PC10 was deposited in the area in the last 112 5 ka B.P., representing 1 5 oxygen isotopic stages and including one incomplete glacial/interglacial cycle and a postglacial period. The sedimentation rate in interglacial period seems to be a little higher than that in glacial, owing to the more terrigenous supply by ice rafting during the interglacial stages.
基金Project supported by the National Natural Science Foundation of China.
文摘The H and O isotope compositions of 41 whole rocks and 24 separated minerals of theNianzishan miarolitic alkaline granite and 3 local meteoric water samples have been meas-ured. The results indicate that the meteoric-hydrothermal convective system might have beendeveloped in this stock. The distributions of δ^(18)O values of whole-rock samples formed anapproximateIy δ^(18)O contours with the characteristic of kighest values in the midst and de-creasing toward the outer zones. The water/rock ratio (W/R) contours were also calculated.This phenomenon might have common significance for stocks or plutons.
