HR: 0800h
AN: V11A-1413    [Abstracts]
TI: Recent Fluids in Chinese Continental Scientific Drilling Project
AU: * Luo, L
EM: luoliqiang@ccsd.org.cn
AF: Natinoal Research Center of Geoanalysis, 26 Baiwanzhuang Street, Beijing, 100037 China
AU: * Luo, L
EM: luoliqiang@ccsd.org.cn
AF: Key Laboratory of Continental Dynamics of MLR, 26 Baiwanzhuang Street, Beijing, 100037 China
AU: Sun, Q
EM: sunqingemail@yahoo.com.cn
AF: Natinoal Research Center of Geoanalysis, 26 Baiwanzhuang Street, Beijing, 100037 China
AU: Zhan, X
EM: zhanxiuchun@yahoo.com.cn
AF: Natinoal Research Center of Geoanalysis, 26 Baiwanzhuang Street, Beijing, 100037 China
AU: Tang, L
EM: tanglijun@cags.net.cn
AF: Natinoal Research Center of Geoanalysis, 26 Baiwanzhuang Street, Beijing, 100037 China
AU: He, H
EM: hehongliao@vip.sina.com
AF: Natinoal Research Center of Geoanalysis, 26 Baiwanzhuang Street, Beijing, 100037 China
AU: Rao, Z
EM: rzu100@sohu.com
AF: Natinoal Research Center of Geoanalysis, 26 Baiwanzhuang Street, Beijing, 100037 China
AB: The fluids and their origins in continental scientific drilling programs have widely been applied to the studies of crustal extension, fluid transportation paths and tectonization processes. The rare gases are good indicators of mantle fluids. The isotopes of carbon and hydrogen and the relationships between them can be used in revealing the fluid sources. And C/3He can provide more ambiguous distinguish between sources. The recent fluids in Chinese continental scientific drilling project (CCSD) have been analyzed and profiles were obtained. He, CO2, Ar, N2, O2, H2 and C1-C4 were determined by two on-line units, a mass spectrometer and a gas chromatograph. Cations and anions in mud samples were analyzed by an on-site high performance liquid chromatograph. Rare earth elements and other inorganic components were measured by ICP-AES and ICP-MS in our laboratory in Beijing. The isotopes of carbon, hydrogen, oxygen, and rare gases, especially helium, were analyzed by mass spectrometers in different laboratories. One key in studying the recent fluids in CCSD project is to identify whether the recent fluids were from the deep earth or not, even when their concentrations were higher than normal levels. Many disturbance components would usually be produced during drilling process. Such the disturbance includes many artifact gases from mud ferment, organic additive decomposition, bit erosion, etc. The analytical data of recent fluids could not be used in the investigation before removing the artifact components. It was found that the high contents of elements were related to the special rocks and minerals, such as sulfide and radiation ores. Carbon dioxide was related with carbonate. The high contents of gases were often found when the cracks or fissures occurred. The distribution of rare earth elements changed with the recent fluids. In some cases, a certain amount of helium gas was found with a high intensity of radiation detected. The high content of methane was once observed with a crystal hole in CCSD project. The samples for isotope analyses were collected in glass bottles and sent to several laboratories in China and Germany, separately. When helium and carbon isotopes in samples were found above the average values in CCSD samples, they would be measured again to confirm the safe conservation of these samples and there was no significant leak of the gases from the bottles. The isotope data show that the abnormal contents of gases found in the CCSD drilling well come from multiple sources and are related to the geological structure in the Sulu ultrahigh-pressure metamorphic belt of China.
DE: 1025 Composition of the mantle
DE: 1030 Geochemical cycles (0330)
DE: 1099 General or miscellaneous
DE: 0330 Geochemical cycles
DE: 1020 Composition of the crust
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2004 AGU Fall Meeting