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| 1 | Calcium isotope fractionation and its controlling factors over authigenic carbonates in the cold seeps of the northern South China Sea显示文摘In this study, we analyzed stable calcium isotope results of authigenic carbonates from two cold seep areas of the Dongsha area and the Baiyun Sag in the northern South China Sea. The stable isotopes of carbon and oxygen as well as the mineral composition of authigenic carbonates were used to investigate control calcium isotope fractionation. The δ44/40Ca ratios of the southwestern Dongsha area samples ranged from 1.21‰ to 1.52‰ and the ratio of the Baiyun Sag sample was 1.55‰ of the SRM915a isotope standard. X-ray diffraction analysis showed that the carbonate samples consisted of dolomite, calcite and aragonite, with small amounts of high-Mg calcite and siderite. The δ13C values of the carbonates of the southwestern Dongsha area varied between δ49.21‰ and δ16.86‰ of the Vienna PeeDee Belemnite (VPDB) standard and the δ18O values ranged from 2.25‰ to 3.72‰ VPDB. The δ13C value of the Baiyun Sag sample was 2.36‰ VPDB and the δ18O value was 0.44‰ VPDB. The δ13C values of the carbonates of the southwestern Dongsha area revealed there is methane seeping into this area, with a variable contribution of methane-derived carbon. The sampled carbonates covered a range of δ13C values suggesting a dominant methane carbon source for the light samples and mixtures of δ13C values for the heavier samples, with possibly an organic or seawater carbon source. The δ18O values indicated that there is enrichment in 18O, which is related to the larger oxygen isotope fractionation in dolomite compared to calcite. The results of the Baiyun Sag sample exhibited normal seawater carbon and oxygen isotopic values, indicating that this sample is not related to methane seepage but instead to precipitation from seawater. The relatively high δ44/40Ca values indicated either precipitation at comparatively high rates in pore-water regimes with high alkalinity, or precipitation from an evolved heavy fluid with high degrees of Ca consumption (Raleigh type fractionation). The dolomite samples from the Dongsha area revealed a clear correlation between the carbon and calcium isotope composition, indicating a link between the amount and/or rate of carbonate precipitation and methane contribution to the bicarbonate source. The results of the three stable isotope systems, mineralogy and petrography, show that mineral composition, the geochemical environment of authigenic carbonates and carbon source can control the calcium isotope fractionation. | WANG ShuHong YAN Wen MAGALHAES H Vitor CHEN Zhong PINHEIRO M Luis GUSSONE Nikolaus | 2012 | Chinese Science Bulletin2012，57，11： | 4 |
| 2 | Photochemical responses and oxidative stress in the clones of Coffea canephora under water deficit conditions显示文摘 | Lima A L S DaMatta F M Pinheiro H A | 2002 | Environmental and Experimental Botany2002，47，23： | 1 |
| 3 | Photochemical responses and oxidative stress in two clones of Coffea canephora under water deficit conditions显示文摘 | LIMA A L S DAMATT F M PINHEIRO H A | 2002 | Environmental and Experimental Botany2002，47，： | 1 |
| 4 | Determination of Formaldehyde by Acetaldehyde in Urine by HPLC显示文摘 | Deandrade J B Deandrade M V Pinheiro H L C | 1999 | American Laboratory1999，31，10： | 1 |
| 5 | Self-sustained phase shift modulated resonant converters:modeling,design,and performance显示文摘 | YOUSSEF M Z PINHEIRO H JAIN P K | 2006 | IEEE Transactions on Power Electronics2006，21，2： | 1 |
| 6 | Drought tolerance in relation to protection against oxidative stress in clones of Coffea canephora subjected to long-term drought显示文摘 | Pinheiro H A DaMatta F M Chaves A R M | 2004 | Plant Science2004，167，6： | 1 |
| 7 | Drought tolerance in relation to protection against oxidat'ive stress inclones of Cojfea canephora subjected to long-term drought 显示文摘 | PINHEIRO H A DAMATTA F M CHAVES ARM | 2004 | Plant Science2004，167，： | 1 |
| 8 | Whole-cell biocatalysis in organic media 显示文摘 | Len R Femandes P Pinheiro H M | 1998 | Enzyme Microb Technol1998，23，： | 1 |
| 9 | Formation processes of methane-derived authigenic carbonates from the Gulf of Cadiz显示文摘 | Magalh~es V H Pinheiro L M Ivanov M K | 2012 | Sedimentary Geology2012，24，3244： | 1 |
| 10 | De- sign of bio - nanosystems for oral delivery of functional compounds显示文摘 | Cerqueira M A Pinheiro A C Silva H D | 2014 | Food Engineering Reviews2014，6，12： | 1 |
| 11 | A morphological and histological characterization of bisexual and male flower types in pomegranate显示文摘 | WETZSTEIN H Y RAVID N WILKINS E ADRIANA PINHEIRO M | 2011 | Journal of the American Society for Horticultural Science2011，136，2： | 1 |
| 12 | Aromatic amines from azo dye reduction: status review with emphasis on direct UV spectrophotometric detection in textile industry wastewaters显示文摘 | Pinheiro H M Touraud E Thomas O | 2004 | Dyes and Pigments2004，61，： | 1 |
| 13 | Self-sustained phase-shift modulated resonant converters: modeling, design, and performance显示文摘 | Youssef M Z Pinheiro H Jain P K | 2006 | IEEE Transactions on Power Electronics2006，21，2： | 1 |
| 14 | Whole-cell biocatalysis in organic media显示文摘 | Fernandes P Pinheiro H M | 1998 | Enzyme & Microb technology1998，23，： | 1 |
| 15 | Determination of formaldehyde and acetaldehyde in urine by HPLC显示文摘 | Deandrade J B Deandrade M V Pinheiro H L C | 1999 | American Laboratory1999，31，10： | 1 |
| 16 | Aromatic amines from azo dye reduction:status review with emphasis on direct UV spectrophotometric detection in textile industry wastewaters显示文摘 | Pinheiro H M Touraud E Thomas O | 2004 | Dyes and Pigments2004，61，12： | 1 |
| 17 | Drought tolerance in relation to protection against oxidative stress in clones of Coffea eanephora subjected to long term drought显示文摘 | Pinheiro H A DaMatta F M Chaves A R M | 2004 | Plant Science2004，167，6： | 1 |
| 18 | Sodiumnitrite downregulates vascular NADPH oxidase and exerts antihyperten-sive effects in hypertension显示文摘 | MONTENEGRO M F AMARAL J H PINHEIRO L C | 2011 | Free Radical Biology and Medicine2011，51，1： | 1 |
| 19 | Zerocurrent and zero-voltage soft-transition commutation cell for PWM inverters显示文摘 | Stein C M de O Grundling H A Pinheiro H | 2004 | IEEE Transactions on Power Electronics2004，19，2： | 1 |
| 20 | Formation Processes of Methane-Derived Authigenic Carbonates from the Gulf of Cadiz显示文摘 | Magalhaes V H Pinheiro L M Ivanov M K | 2012 | Sedimentary Geology2012，，： | 1 |
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